JSP小练习新闻管理系统
Hi，大家好，我是编程小6，很荣幸遇见你，我把这些年在开发过程中遇到的问题或想法写出来，今天说一说JSP小练习新闻管理系统,希望能够帮助你!!!。
JSP小练习新闻管理系统
该练习为帮助大家梳理编程思路 和 增删改查 练习其中不符合业务逻辑部分请忽略
源码地址：https://download.csdn.net/download/qq_24330181/85705794
配套视频讲解：https://www.bilibili.com/video/BV1cY4y137hA
项目演示：
新建项目：
配置pom.xml文件：
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.lihaozhe</groupId>
<artifactId>news</artifactId>
<version>1.0-SNAPSHOT</version>
<name>news</name>
<packaging>war</packaging>
<properties>
<jdk.version>17</jdk.version>
<maven.compiler.source>17</maven.compiler.source>
<maven.compiler.target>17</maven.compiler.target>
<maven.compiler.compilerVersion>17</maven.compiler.compilerVersion>
<maven.compiler.encoding>utf-8</maven.compiler.encoding>
<project.build.sourceEncoding>utf-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<maven.test.failure.ignore>true</maven.test.failure.ignore>
<maven.test.skip>true</maven.test.skip>
<junit.version>5.8.2</junit.version>
<fastjson.version>2.0.6</fastjson.version>
<gson.version>2.9.0</gson.version>
<hutool.version>5.8.0.M3</hutool.version>
<jackson.version>2.13.3</jackson.version>
<lombok.version>1.18.24</lombok.version>
</properties>
<dependencies>
<dependency>
<groupId>jakarta.servlet</groupId>
<artifactId>jakarta.servlet-api</artifactId>
<version>5.0.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-api</artifactId>
<version>${junit.version}</version>
<scope>test</scope>
</dependency>
<!--commons-->
<!--commons-lang3-->
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.8.1</version>
</dependency>
<!--commons-io-->
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.11.0</version>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-engine</artifactId>
<version>${junit.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>cn.hutool</groupId>
<artifactId>hutool-all</artifactId>
<version>${hutool.version}</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>${lombok.version}</version>
<scope>provided</scope>
</dependency>
<!--json-->
<!--fastjson-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>${fastjson.version}</version>
</dependency>
<!--gson-->
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>${gson.version}</version>
</dependency>
<!--jackson-->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>${jackson.version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>${jackson.version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>${jackson.version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.datatype</groupId>
<artifactId>jackson-datatype-jsr310</artifactId>
<version>${jackson.version}</version>
</dependency>
<!--webjar-->
<dependency>
<groupId>org.webjars</groupId>
<artifactId>jquery</artifactId>
<version>3.6.0</version>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>bootstrap</artifactId>
<version>5.1.3</version>
</dependency>
<!--el表达式-->
<dependency>
<groupId>jakarta.servlet.jsp.jstl</groupId>
<artifactId>jakarta.servlet.jsp.jstl-api</artifactId>
<version>2.0.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.glassfish.web</groupId>
<artifactId>jakarta.servlet.jsp.jstl</artifactId>
<version>2.0.0</version>
<scope>provided</scope>
</dependency>
</dependencies>
<build>
<!--项目打包文件名-->
<!--<finalName>news</finalName>-->
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>3.3.2</version>
</plugin>
<!-- 编译级别 -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.1</version>
<configuration>
<!-- 设置编译字符编码 -->
<encoding>UTF-8</encoding>
<!-- 设置编译jdk版本 -->
<source>${jdk.version}</source>
<target>${jdk.version}</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-clean-plugin</artifactId>
<version>3.2.0</version>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-resources-plugin</artifactId>
<version>3.2.0</version>
</plugin>
<!-- 打包的时候跳过测试junit begin -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.22.2</version>
<configuration>
<skip>true</skip>
</configuration>
</plugin>
<!-- tomcat7插件 -->
<plugin>
<groupId>org.apache.tomcat.maven</groupId>
<artifactId>tomcat7-maven-plugin</artifactId>
<version>2.2</version>
<configuration>
<port>6633</port>
<path>/lhz</path>
<uriEncoding>UTF-8</uriEncoding>
<!-- tomcat热部署 -->
<username>admin</username>
<password>admin</password>
<url>http://192.168.95.114:8080/manager/text</url>
</configuration>
</plugin>
<!-- jetty插件 -->
<plugin>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-maven-plugin</artifactId>
<version>11.0.9</version>
<configuration>
<webApp>
<contextPath>/lhz</contextPath>
<defaultsDescriptor>${basedir}/src/main/resources/webdefault.xml</defaultsDescriptor>
</webApp>
<httpConnector>
<port>6633</port>
</httpConnector>
</configuration>
</plugin>
</plugins>
</build>
</project>
编辑webdefault.xml文件：
webdefault.xml文件存放在src/main/resources目录下
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" metadata-complete="false" version="3.1">
<!-- ===================================================================== -->
<!-- This file contains the default descriptor for web applications. -->
<!-- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -->
<!-- The intent of this descriptor is to include jetty specific or common -->
<!-- configuration for all webapps. If a context has a webdefault.xml -->
<!-- descriptor, it is applied before the context's own web.xml file -->
<!-- -->
<!-- A context may be assigned a default descriptor by calling -->
<!-- WebAppContext.setDefaultsDescriptor(String). -->
<!-- -->
<!-- This file is present in the jetty-webapp.jar, and is used as the -->
<!-- defaults descriptor if no other is explicitly set on a context. -->
<!-- -->
<!-- A copy of this file is also placed into the $JETTY_HOME/etc dir of -->
<!-- the distribution, and is referenced by some of the other xml files, -->
<!-- eg the jetty-deploy.xml file. -->
<!-- ===================================================================== -->
<description>
Default web.xml file.
This file is applied to a Web application before its own WEB_INF/web.xml file
</description>
<!-- ==================================================================== -->
<!-- Removes static references to beans from javax.el.BeanELResolver to -->
<!-- ensure webapp classloader can be released on undeploy -->
<!-- ==================================================================== -->
<listener>
<listener-class>org.eclipse.jetty.servlet.listener.ELContextCleaner</listener-class>
</listener>
<!-- ==================================================================== -->
<!-- Removes static cache of Methods from java.beans.Introspector to -->
<!-- ensure webapp classloader can be released on undeploy -->
<!-- ==================================================================== -->
<listener>
<listener-class>org.eclipse.jetty.servlet.listener.IntrospectorCleaner</listener-class>
</listener>
<!-- ==================================================================== -->
<!-- Context params to control Session Cookies -->
<!-- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -->
<!-- UNCOMMENT TO ACTIVATE <context-param> <param-name>org.eclipse.jetty.servlet.SessionDomain</param-name> <param-value>127.0.0.1</param-value> </context-param> <context-param> <param-name>org.eclipse.jetty.servlet.SessionPath</param-name> <param-value>/</param-value> </context-param> <context-param> <param-name>org.eclipse.jetty.servlet.MaxAge</param-name> <param-value>-1</param-value> </context-param> -->
<!-- ==================================================================== -->
<!-- The default servlet. -->
<!-- This servlet, normally mapped to /, provides the handling for static -->
<!-- content, OPTIONS and TRACE methods for the context. -->
<!-- The following initParameters are supported: -->
<!-- * acceptRanges If true, range requests and responses are * supported * * dirAllowed If true, directory listings are returned if no * welcome file is found. Else 403 Forbidden. * * welcomeServlets If true, attempt to dispatch to welcome files * that are servlets, but only after no matching static * resources could be found. If false, then a welcome * file must exist on disk. If "exact", then exact * servlet matches are supported without an existing file. * Default is true. * * This must be false if you want directory listings, * but have login.jsp in your welcome file list. * * redirectWelcome If true, welcome files are redirected rather than * forwarded to. * * gzip If set to true, then static content will be served as * gzip content encoded if a matching resource is * found ending with ".gz" (default false) * (deprecated: use precompressed) * * precompressed If set to a comma separated list of encoding types (that may be * listed in a requests Accept-Encoding header) to file * extension mappings to look for and serve. For example: * "br=.br,gzip=.gz,bzip2=.bz". * If set to a boolean True, then a default set of compressed formats * will be used, otherwise no precompressed formats. * * resourceBase Set to replace the context resource base * * resourceCache If set, this is a context attribute name, which the servlet * will use to look for a shared ResourceCache instance. * * relativeResourceBase * Set with a pathname relative to the base of the * servlet context root. Useful for only serving static content out * of only specific subdirectories. * * pathInfoOnly If true, only the path info will be applied to the resourceBase * * stylesheet Set with the location of an optional stylesheet that will be used * to decorate the directory listing html. * * etags If True, weak etags will be generated and handled. * * maxCacheSize The maximum total size of the cache or 0 for no cache. * maxCachedFileSize The maximum size of a file to cache * maxCachedFiles The maximum number of files to cache * * useFileMappedBuffer * If set to true, it will use mapped file buffers to serve static content * when using an NIO connector. Setting this value to false means that * a direct buffer will be used instead of a mapped file buffer. * This file sets the value to true. * * cacheControl If set, all static content will have this value set as the cache-control * header. * * encodingHeaderCacheSize * Max entries in a cache of ACCEPT-ENCODING headers. * * otherGzipFileExtensions * defaults to .svgz but a comma separated list of gzip equivalent file extensions can be supplied * -->
<!-- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -->
<servlet>
<servlet-name>default</servlet-name>
<servlet-class>org.eclipse.jetty.servlet.DefaultServlet</servlet-class>
<init-param>
<param-name>acceptRanges</param-name>
<param-value>true</param-value>
</init-param>
<init-param>
<param-name>dirAllowed</param-name>
<param-value>true</param-value>
</init-param>
<init-param>
<param-name>welcomeServlets</param-name>
<param-value>false</param-value>
</init-param>
<init-param>
<param-name>redirectWelcome</param-name>
<param-value>false</param-value>
</init-param>
<init-param>
<param-name>maxCacheSize</param-name>
<param-value>256000000</param-value>
</init-param>
<init-param>
<param-name>maxCachedFileSize</param-name>
<param-value>200000000</param-value>
</init-param>
<init-param>
<param-name>maxCachedFiles</param-name>
<param-value>2048</param-value>
</init-param>
<init-param>
<param-name>etags</param-name>
<param-value>false</param-value>
</init-param>
<init-param>
<param-name>useFileMappedBuffer</param-name>
<param-value>false</param-value>
</init-param>
<load-on-startup>0</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>default</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<!-- ==================================================================== -->
<!-- JSP Servlet -->
<!-- This is the jasper JSP servlet. -->
<!-- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -->
<!-- The JSP page compiler and execution servlet, which is the mechanism -->
<!-- used by the jsp container to support JSP pages. Traditionally, -->
<!-- this servlet is mapped to URL pattern "*.jsp". This servlet -->
<!-- supports the following initialization parameters (default values -->
<!-- are in square brackets): -->
<!-- -->
<!-- checkInterval If development is false and reloading is true, -->
<!-- background compiles are enabled. checkInterval -->
<!-- is the time in seconds between checks to see -->
<!-- if a JSP page needs to be recompiled. [300] -->
<!-- -->
<!-- compiler Which compiler Ant should use to compile JSP -->
<!-- pages. See the Ant documentation for more -->
<!-- information. [javac] -->
<!-- -->
<!-- classdebuginfo Should the class file be compiled with -->
<!-- debugging information? [true] -->
<!-- -->
<!-- classpath What class path should I use while compiling -->
<!-- generated servlets? [Created dynamically -->
<!-- based on the current web application] -->
<!-- Set to ? to make the container explicitly set -->
<!-- this parameter. -->
<!-- -->
<!-- development Is Jasper used in development mode (will check -->
<!-- for JSP modification on every access)? [true] -->
<!-- -->
<!-- enablePooling Determines whether tag handler pooling is -->
<!-- enabled [true] -->
<!-- -->
<!-- fork Tell Ant to fork compiles of JSP pages so that -->
<!-- a separate JVM is used for JSP page compiles -->
<!-- from the one Tomcat is running in. [true] -->
<!-- -->
<!-- ieClassId The class-id value to be sent to Internet -->
<!-- Explorer when using <jsp:plugin> tags. -->
<!-- [clsid:8AD9C840-044E-11D1-B3E9-00805F499D93] -->
<!-- -->
<!-- javaEncoding Java file encoding to use for generating java -->
<!-- source files. [UTF-8] -->
<!-- -->
<!-- keepgenerated Should we keep the generated Java source code -->
<!-- for each page instead of deleting it? [true] -->
<!-- -->
<!-- logVerbosityLevel The level of detailed messages to be produced -->
<!-- by this servlet. Increasing levels cause the -->
<!-- generation of more messages. Valid values are -->
<!-- FATAL, ERROR, WARNING, INFORMATION, and DEBUG. -->
<!-- [WARNING] -->
<!-- -->
<!-- mappedfile Should we generate static content with one -->
<!-- print statement per input line, to ease -->
<!-- debugging? [false] -->
<!-- -->
<!-- -->
<!-- reloading Should Jasper check for modified JSPs? [true] -->
<!-- -->
<!-- suppressSmap Should the generation of SMAP info for JSR45 -->
<!-- debugging be suppressed? [false] -->
<!-- -->
<!-- dumpSmap Should the SMAP info for JSR45 debugging be -->
<!-- dumped to a file? [false] -->
<!-- False if suppressSmap is true -->
<!-- -->
<!-- scratchdir What scratch directory should we use when -->
<!-- compiling JSP pages? [default work directory -->
<!-- for the current web application] -->
<!-- -->
<!-- tagpoolMaxSize The maximum tag handler pool size [5] -->
<!-- -->
<!-- xpoweredBy Determines whether X-Powered-By response -->
<!-- header is added by generated servlet [false] -->
<!-- -->
<!-- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -->
<servlet id="jsp">
<servlet-name>jsp</servlet-name>
<servlet-class>org.eclipse.jetty.jsp.JettyJspServlet</servlet-class>
<init-param>
<param-name>logVerbosityLevel</param-name>
<param-value>DEBUG</param-value>
</init-param>
<init-param>
<param-name>fork</param-name>
<param-value>false</param-value>
</init-param>
<init-param>
<param-name>xpoweredBy</param-name>
<param-value>false</param-value>
</init-param>
<init-param>
<param-name>compilerTargetVM</param-name>
<param-value>1.7</param-value>
</init-param>
<init-param>
<param-name>compilerSourceVM</param-name>
<param-value>1.7</param-value>
</init-param>
<!-- <init-param> <param-name>classpath</param-name> <param-value>?</param-value> </init-param> -->
<load-on-startup>0</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>jsp</servlet-name>
<url-pattern>*.jsp</url-pattern>
<url-pattern>*.jspf</url-pattern>
<url-pattern>*.jspx</url-pattern>
<url-pattern>*.xsp</url-pattern>
<url-pattern>*.JSP</url-pattern>
<url-pattern>*.JSPF</url-pattern>
<url-pattern>*.JSPX</url-pattern>
<url-pattern>*.XSP</url-pattern>
</servlet-mapping>
<!-- ==================================================================== -->
<!-- Default session configuration -->
<!-- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -->
<session-config>
<session-timeout>30</session-timeout>
</session-config>
<!-- ==================================================================== -->
<!-- Default MIME mappings -->
<!-- The default MIME mappings are provided by the mime.properties -->
<!-- resource in the jetty-http.jar file. Additional or modified -->
<!-- mappings may be specified here -->
<!-- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -->
<!-- UNCOMMENT TO ACTIVATE <mime-mapping> <extension>mysuffix</extension> <mime-type>mymime/type</mime-type> </mime-mapping> -->
<!-- ==================================================================== -->
<!-- Default welcome files -->
<!-- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -->
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<!-- ==================================================================== -->
<!-- Default locale encodings -->
<!-- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -->
<locale-encoding-mapping-list>
<locale-encoding-mapping>
<locale>ar</locale>
<encoding>ISO-8859-6</encoding>
</locale-encoding-mapping>
<locale-encoding-mapping>
<locale>be</locale>
<encoding>ISO-8859-5</encoding>
</locale-encoding-mapping>
<locale-encoding-mapping>
<locale>bg</locale>
<encoding>ISO-8859-5</encoding>
</locale-encoding-mapping>
<locale-encoding-mapping>
<locale>ca</locale>
<encoding>ISO-8859-1</encoding>
</locale-encoding-mapping>
<locale-encoding-mapping>
<locale>cs</locale>
<encoding>ISO-8859-2</encoding>
</locale-encoding-mapping>
<locale-encoding-mapping>
<locale>da</locale>
<encoding>ISO-8859-1</encoding>
</locale-encoding-mapping>
<locale-encoding-mapping>
<locale>de</locale>
<encoding>ISO-8859-1</encoding>
</locale-encoding-mapping>
<locale-encoding-mapping>
<locale>el</locale>
<encoding>ISO-8859-7</encoding>
</locale-encoding-mapping>
<locale-encoding-mapping>
<locale>en</locale>
<encoding>ISO-8859-1</encoding>
</locale-encoding-mapping>
<locale-encoding-mapping>
<locale>es</locale>
<encoding>ISO-8859-1</encoding>
</locale-encoding-mapping>
<locale-encoding-mapping>
<locale>et</locale>
<encoding>ISO-8859-1</encoding>
</locale-encoding-mapping>
<locale-encoding-mapping>
<locale>fi</locale>
<encoding>ISO-8859-1</encoding>
</locale-encoding-mapping>
<locale-encoding-mapping>
<locale>fr</locale>
<encoding>ISO-8859-1</encoding>
</locale-encoding-mapping>
<locale-encoding-mapping>
<locale>hr</locale>
<encoding>ISO-8859-2</encoding>
</locale-encoding-mapping>
<locale-encoding-mapping>
<locale>hu</locale>
<encoding>ISO-8859-2</encoding>
</locale-encoding-mapping>
<locale-encoding-mapping>
<locale>is</locale>
<encoding>ISO-8859-1</encoding>
</locale-encoding-mapping>
<locale-encoding-mapping>
<locale>it</locale>
<encoding>ISO-8859-1</encoding>
</locale-encoding-mapping>
<locale-encoding-mapping>
<locale>iw</locale>
<encoding>ISO-8859-8</encoding>
</locale-encoding-mapping>
<locale-encoding-mapping>
<locale>ja</locale>
<encoding>Shift_JIS</encoding>
</locale-encoding-mapping>
<locale-encoding-mapping>
<locale>ko</locale>
<encoding>EUC-KR</encoding>
</locale-encoding-mapping>
<locale-encoding-mapping>
<locale>lt</locale>
<encoding>ISO-8859-2</encoding>
</locale-encoding-mapping>
<locale-encoding-mapping>
<locale>lv</locale>
<encoding>ISO-8859-2</encoding>
</locale-encoding-mapping>
<locale-encoding-mapping>
<locale>mk</locale>
<encoding>ISO-8859-5</encoding>
</locale-encoding-mapping>
<locale-encoding-mapping>
<locale>nl</locale>
<encoding>ISO-8859-1</encoding>
</locale-encoding-mapping>
<locale-encoding-mapping>
<locale>no</locale>
<encoding>ISO-8859-1</encoding>
</locale-encoding-mapping>
<locale-encoding-mapping>
<locale>pl</locale>
<encoding>ISO-8859-2</encoding>
</locale-encoding-mapping>
<locale-encoding-mapping>
<locale>pt</locale>
<encoding>ISO-8859-1</encoding>
</locale-encoding-mapping>
<locale-encoding-mapping>
<locale>ro</locale>
<encoding>ISO-8859-2</encoding>
</locale-encoding-mapping>
<locale-encoding-mapping>
<locale>ru</locale>
<encoding>ISO-8859-5</encoding>
</locale-encoding-mapping>
<locale-encoding-mapping>
<locale>sh</locale>
<encoding>ISO-8859-5</encoding>
</locale-encoding-mapping>
<locale-encoding-mapping>
<locale>sk</locale>
<encoding>ISO-8859-2</encoding>
</locale-encoding-mapping>
<locale-encoding-mapping>
<locale>sl</locale>
<encoding>ISO-8859-2</encoding>
</locale-encoding-mapping>
<locale-encoding-mapping>
<locale>sq</locale>
<encoding>ISO-8859-2</encoding>
</locale-encoding-mapping>
<locale-encoding-mapping>
<locale>sr</locale>
<encoding>ISO-8859-5</encoding>
</locale-encoding-mapping>
<locale-encoding-mapping>
<locale>sv</locale>
<encoding>ISO-8859-1</encoding>
</locale-encoding-mapping>
<locale-encoding-mapping>
<locale>tr</locale>
<encoding>ISO-8859-9</encoding>
</locale-encoding-mapping>
<locale-encoding-mapping>
<locale>uk</locale>
<encoding>ISO-8859-5</encoding>
</locale-encoding-mapping>
<locale-encoding-mapping>
<locale>zh</locale>
<encoding>GB2312</encoding>
</locale-encoding-mapping>
<locale-encoding-mapping>
<locale>zh_TW</locale>
<encoding>Big5</encoding>
</locale-encoding-mapping>
</locale-encoding-mapping-list>
<!-- ==================================================================== -->
<!-- Disable TRACE method with security constraint -->
<!-- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -->
<security-constraint>
<web-resource-collection>
<web-resource-name>Disable TRACE</web-resource-name>
<url-pattern>/</url-pattern>
<http-method>TRACE</http-method>
</web-resource-collection>
<auth-constraint/>
</security-constraint>
<security-constraint>
<web-resource-collection>
<web-resource-name>Enable everything but TRACE</web-resource-name>
<url-pattern>/</url-pattern>
<http-method-omission>TRACE</http-method-omission>
</web-resource-collection>
</security-constraint>
</web-app>
启动项目：
jetty插件启动：
启动信息：
/home/lhz/opt/jdk-17/bin/java -Dmaven.multiModuleProjectDirectory=/home/lhz/IdeaProjects/news -Dmaven.home=/home/lhz/.m2/wrapper/dists/apache-maven-3.8.5-bin/5i5jha092a3i37g0paqnfr15e0/apache-maven-3.8.5 -Dclassworlds.conf=/home/lhz/.m2/wrapper/dists/apache-maven-3.8.5-bin/5i5jha092a3i37g0paqnfr15e0/apache-maven-3.8.5/bin/m2.conf -Dmaven.ext.class.path=/home/lhz/opt/idea-IU/plugins/maven/lib/maven-event-listener.jar -javaagent:/home/lhz/opt/idea-IU/lib/idea_rt.jar=43273:/home/lhz/opt/idea-IU/bin -Dfile.encoding=UTF-8 -classpath /home/lhz/.m2/wrapper/dists/apache-maven-3.8.5-bin/5i5jha092a3i37g0paqnfr15e0/apache-maven-3.8.5/boot/plexus-classworlds.license:/home/lhz/.m2/wrapper/dists/apache-maven-3.8.5-bin/5i5jha092a3i37g0paqnfr15e0/apache-maven-3.8.5/boot/plexus-classworlds-2.6.0.jar org.codehaus.classworlds.Launcher -Didea.version=2022.1.2 org.eclipse.jetty:jetty-maven-plugin:11.0.9:run
[INFO] Scanning for projects...
[INFO]
[INFO] -------------------------< com.lihaozhe:news >--------------------------
[INFO] Building news 1.0-SNAPSHOT
[INFO] --------------------------------[ war ]---------------------------------
[INFO]
[INFO] >>> jetty-maven-plugin:11.0.9:run (default-cli) > test-compile @ news >>>
[INFO]
[INFO] --- maven-resources-plugin:3.2.0:resources (default-resources) @ news ---
[INFO] Using 'utf-8' encoding to copy filtered resources.
[INFO] Using 'utf-8' encoding to copy filtered properties files.
[INFO] Copying 1 resource
[INFO]
[INFO] --- maven-compiler-plugin:3.8.1:compile (default-compile) @ news ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 1 source file to /home/lhz/IdeaProjects/news/target/classes
[INFO]
[INFO] --- maven-resources-plugin:3.2.0:testResources (default-testResources) @ news ---
[INFO] Not copying test resources
[INFO]
[INFO] --- maven-compiler-plugin:3.8.1:testCompile (default-testCompile) @ news ---
[INFO] Not compiling test sources
[INFO]
[INFO] <<< jetty-maven-plugin:11.0.9:run (default-cli) < test-compile @ news <<<
[INFO]
[INFO]
[INFO] --- jetty-maven-plugin:11.0.9:run (default-cli) @ news ---
[INFO] Configuring Jetty for project: news
[INFO] Classes = /home/lhz/IdeaProjects/news/target/classes
[INFO] Context path = /lhz
[INFO] Tmp directory = /home/lhz/IdeaProjects/news/target/tmp
[INFO] web.xml file = file:///home/lhz/IdeaProjects/news/src/main/webapp/WEB-INF/web.xml
[INFO] Webapp directory = /home/lhz/IdeaProjects/news/src/main/webapp
[INFO] Web defaults = /home/lhz/IdeaProjects/news/src/main/resources/webdefault.xml
[INFO] Web overrides = none
[INFO] jetty-11.0.9; built: 2022-03-30T17:44:47.085Z; git: 243a48a658a183130a8c8de353178d154ca04f04; jvm 17.0.3.1+2-LTS-6
[INFO] Session workerName=node0
[INFO] Started o.e.j.m.p.MavenWebAppContext@617449dd{
/lhz,[file:///home/lhz/IdeaProjects/news/src/main/webapp/, jar:file:///home/lhz/.m2/repository/org/webjars/jquery/3.6.0/jquery-3.6.0.jar!/META-INF/resources, jar:file:///home/lhz/.m2/repository/org/webjars/popper.js/2.9.3/popper.js-2.9.3.jar!/META-INF/resources, jar:file:///home/lhz/.m2/repository/org/webjars/bootstrap/5.1.3/bootstrap-5.1.3.jar!/META-INF/resources],AVAILABLE}{
file:///home/lhz/IdeaProjects/news/src/main/webapp/}
[INFO] Started ServerConnector@bd93bc3{
HTTP/1.1, (http/1.1)}{
0.0.0.0:6633}
[INFO] Started Server@2443135{
STARTING}[11.0.9,sto=0] @3549ms
[INFO] Automatic redeployment disabled, see 'mvn jetty:help' for more redeployment options
浏览器访问：
访问地址：http://localhost:6633/lhz/
设计DTO类
新闻类
package com.lihaozhe.news.dto;
import lombok.Data;
import java.util.Date;
/** * @author 李昊哲 * @version 1.0.0 2022/6/10 上午8:41 */
@Data
public class News {
private long id;
private String title;
private String author;
private Date date;
private long readCount;
private static long count;
public News() {
this.id = ++count;
}
public News(String title, String author, Date date, long readCount) {
this.title = title;
this.author = author;
this.date = date;
this.readCount = readCount;
this.id = ++count;
}
public News(long id, String title, String author, Date date, long readCount) {
this.id = id;
this.title = title;
this.author = author;
this.date = date;
this.readCount = readCount;
}
}
用户类
package com.lihaozhe.news.dto;
import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.NoArgsConstructor;
import lombok.Setter;
/** * @author 李昊哲 * @version 1.0.0 2022/6/10 上午8:41 */
@Setter
@Getter
@NoArgsConstructor
@AllArgsConstructor
public class User {
/** * 账号 */
private String account;
/** * 密码 */
private String password;
/** * 姓名 */
private String nickname;
public User(String account, String password) {
this.account = account;
this.password = password;
}
}
设计VO类
用户类
package com.lihaozhe.news.vo;
import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.NoArgsConstructor;
import lombok.Setter;
/** * @author 李昊哲 * @version 1.0.0 2022/6/10 上午8:41 */
@Setter
@Getter
@NoArgsConstructor
@AllArgsConstructor
public class UserVo {
/** * 账号 */
private String account;
/** * 密码 */
private String password;
/** * 姓名 */
private String nickname;
public UserVo(String account, String password) {
this.account = account;
this.password = password;
}
}
设计数据库类
package com.lihaozhe.news.dao;
import com.lihaozhe.news.dto.News;
import com.lihaozhe.news.dto.User;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.concurrent.ThreadLocalRandom;
/** * @author 李昊哲 * @version 1.0.0 2022/6/10 上午8:41 */
public class Newsdb {
private static Newsdb instance = new Newsdb();
private Newsdb() {
userList.add(new User("admin", "123456", "李昊哲"));
userList.add(new User("user", "123456", "李哲昊"));
newsList.add(new News("新闻一", "张三", new Date(), ThreadLocalRandom.current().nextInt(1000, 10000)));
newsList.add(new News("新闻二", "张三", new Date(), ThreadLocalRandom.current().nextInt(1000, 10000)));
newsList.add(new News("新闻三", "张三", new Date(), ThreadLocalRandom.current().nextInt(1000, 10000)));
newsList.add(new News("新闻四", "张三", new Date(), ThreadLocalRandom.current().nextInt(1000, 10000)));
newsList.add(new News("新闻五", "张三", new Date(), ThreadLocalRandom.current().nextInt(1000, 10000)));;
}
/** * 用户表 */
private List<User> userList = new ArrayList<>();
/** * 新闻表 */
private List<News> newsList = new ArrayList<>();
public List<User> getUserList() {
return userList;
}
public void setUserList(List<User> userList) {
this.userList = userList;
}
public List<News> getNewsList() {
return newsList;
}
public void setNewsList(List<News> newsList) {
this.newsList = newsList;
}
public static Newsdb getInstance() {
return instance;
}
}
登录页面
文件位置src/main/webapp/WEB-INF/view/login.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>李昊哲-小课</title>
<link rel="stylesheet" href="${pageContext.request.contextPath}/webjars/bootstrap/5.1.3/css/bootstrap.min.css">
<script src="${pageContext.request.contextPath}/webjars/bootstrap/5.1.3/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container" style="font-family: 微软雅黑">
<div class="page-header mt-5">
<h3 class="text-center">登录</h3>
</div>
<hr class="my-5">
<form action="${pageContext.request.contextPath}/LoginServlet" method="post">
<div class="form-group row mb-3">
<p class="col-5 lead text-end">账 号：</p>
<div class="col-3">
<input type="text" class="form-control" name="account" value="" placeholder="请输入账号" autocomplete="off">
</div>
</div>
<div class="form-group row mb-3">
<p class="col-5 lead text-end">密 码：</p>
<div class="col-3">
<input type="password" class="form-control" name="password" value="" placeholder="请输入密码">
</div>
</div>
<div class="row">
<p class="col-4 offset-4 text-center bg-danger text-white lead mb-3">${requestScope.msg}</p>
</div>
<div class="form-group row mb-3">
<div class="col-4 offset-4">
<div class="d-grid">
<button type="submit" class="btn btn-outline-success">登录系统</button>
</div>
</div>
</div>
</form>
</div>
</body>
</html>
默认主页
修改src/main/webapp/index.jsp
<%@ page contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
<!DOCTYPE html>
<html>
<head>
<title>李昊哲-小课</title>
</head>
<body>
<jsp:forward page="/WEB-INF/view/login.jsp"></jsp:forward>
</body>
</html>
浏览器访问登录页面
访问地址：http://localhost:6633/lhz/
!
登录Servlet
package com.lihaozhe.news.controller;
/** * @author 李昊哲 * @version 1.0.0 2022/6/10 上午8:41 */
import com.lihaozhe.news.dao.Newsdb;
import com.lihaozhe.news.dto.User;
import com.lihaozhe.news.vo.UserVo;
import jakarta.servlet.*;
import jakarta.servlet.http.*;
import jakarta.servlet.annotation.*;
import org.apache.commons.lang3.StringUtils;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
@WebServlet(name = "LoginServlet", value = "/LoginServlet")
public class LoginServlet extends HttpServlet {
private final static Newsdb instance = Newsdb.getInstance();
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String account = request.getParameter("account");
if (StringUtils.isEmpty(account)) {
request.setAttribute("msg", "账号不能为空");
request.getRequestDispatcher("/").forward(request, response);
return;
}
String password = request.getParameter("password");
if (StringUtils.isEmpty(password)) {
request.setAttribute("msg", "密码不能为空");
request.getRequestDispatcher("/").forward(request, response);
return;
}
List<User> userList = instance.getUserList();
Iterator<User> it = userList.listIterator();
while (it.hasNext()) {
User user = it.next();
if (user.getAccount().equals(account) && user.getPassword().equals(password)) {
UserVo userVo = new UserVo();
userVo.setAccount(user.getAccount());
userVo.setNickname(user.getNickname());
request.getSession().setAttribute("operator", userVo);
request.getRequestDispatcher("/WEB-INF/view/newslist.jsp").forward(request, response);
return;
}
}
request.setAttribute("msg", "账号或者密码错误");
request.getRequestDispatcher("/").forward(request, response);
return;
}
}
新闻列表页面
文件位置src/main/webapp/WEB-INF/view/newslist.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>李昊哲-小课</title>
<link rel="stylesheet" href="${pageContext.request.contextPath}/webjars/bootstrap/5.1.3/css/bootstrap.min.css">
<script src="${pageContext.request.contextPath}/webjars/bootstrap/5.1.3/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<div class="page-header mt-5">
<h3 class="text-center">新闻列表</h3>
</div>
<hr class="my-3">
<div class="row">
<div class="col-6">操作者：${sessionScope.operator.nickname}</div>
<div class="col-6 text-end"><a href="${pageContext.request.contextPath}/Logout" class="btn btn-secondary">退出系统</a></div>
</div>
<hr class="my-3">
<table class="table table-bordered">
<thead>
<tr class="text-center">
<th>新闻编号</th>
<th>新闻标题</th>
<th>作者</th>
<th>发布时间</th>
<th>阅读量</th>
<th>操作</th>
</tr>
</thead>
<tbody>
<tr>
<td>1</td>
<td>新闻一</td>
<td>张三</td>
<td> 2022-06-20</td>
<td>3878</td>
<td>
<a href="/lhz/RemoveNewsById.do?id=2" class="btn btn-danger">删除</a>
<a href="/lhz/ToAddNewsPage.do" class="btn btn-success">新增</a>
<a href="/lhz/ToUpdateNewsPage.do?id=2" class="btn btn-info">修改</a>
</td>
</tr>
<tr>
<td>2</td>
<td>新闻二</td>
<td>张三</td>
<td> 2022-06-20</td>
<td>8456</td>
<td>
<a href="/lhz/RemoveNewsById.do?id=1" class="btn btn-danger">删除</a>
<a href="/lhz/ToAddNewsPage.do" class="btn btn-success">新增</a>
<a href="/lhz/ToUpdateNewsPage.do?id=1" class="btn btn-info">修改</a>
</td>
</tr><tr>
<td>3</td>
<td>新闻三</td>
<td>张三</td>
<td> 2022-06-20</td>
<td>1895</td>
<td>
<a href="/lhz/RemoveNewsById.do?id=3" class="btn btn-danger">删除</a>
<a href="/lhz/ToAddNewsPage.do" class="btn btn-success">新增</a>
<a href="/lhz/ToUpdateNewsPage.do?id=3" class="btn btn-info">修改</a>
</td>
</tr>
<tr>
<td>4</td>
<td>新闻四</td>
<td>张三</td>
<td> 2022-06-20</td>
<td>9331</td>
<td>
<a href="/lhz/RemoveNewsById.do?id=4" class="btn btn-danger">删除</a>
<a href="/lhz/ToAddNewsPage.do" class="btn btn-success">新增</a>
<a href="/lhz/ToUpdateNewsPage.do?id=4" class="btn btn-info">修改</a>
</td>
</tr>
<tr>
<td>5</td>
<td>新闻五</td>
<td>张三</td>
<td> 2022-06-20</td>
<td>1573</td>
<td>
<a href="/lhz/RemoveNewsById.do?id=5" class="btn btn-danger">删除</a>
<a href="/lhz/ToAddNewsPage.do" class="btn btn-success">新增</a>
<a href="/lhz/ToUpdateNewsPage.do?id=5" class="btn btn-info">修改</a>
</td>
</tr>
</tbody>
</table>
</div>
</body>
</html>
测试登录过程
访问地址：http://localhost:6633/lhz/
访问主页
未输入账号登录
未输入密码
输入错误账号或密码
输入正确账号密码
测试账号：admin
测试密码：123456
输入正确账号密码登录系统后系统跳转新闻列表页面
退出系统
退出系统路由
package com.lihaozhe.news.router;
/** * @author 李昊哲 * @version 1.0.0 2022/6/10 上午8:41 */
import jakarta.servlet.*;
import jakarta.servlet.http.*;
import jakarta.servlet.annotation.*;
import java.io.IOException;
@WebServlet(name = "Logout", value = "/Logout")
public class Logout extends HttpServlet {
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// session 失效
request.getSession().invalidate();
// 网页重定向到主页
response.sendRedirect(request.getContextPath() + "/");
}
}
回到登录页面
新闻列表
新闻列表Servlet
package com.lihaozhe.news.controller;
/** * @author 李昊哲 * @version 1.0.0 2022/6/10 上午8:41 */
import com.lihaozhe.news.dao.Newsdb;
import com.lihaozhe.news.dto.News;
import jakarta.servlet.*;
import jakarta.servlet.http.*;
import jakarta.servlet.annotation.*;
import java.io.IOException;
import java.util.List;
@WebServlet(name = "AllNews", value = "/AllNews.do")
public class AllNews extends HttpServlet {
private static final long serialVersionUID = -517354344752297721L;
private final static Newsdb instance = Newsdb.getInstance();
@Override
protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
List<News> newsList = instance.getNewsList();
request.setAttribute("newsList", newsList);
request.getRequestDispatcher("/WEB-INF/view/newslist.jsp").forward(request, response);
}
}
新闻列表页面
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<html>
<head>
<title>李昊哲-小课</title>
<link rel="stylesheet" href="${pageContext.request.contextPath}/webjars/bootstrap/5.1.3/css/bootstrap.min.css">
<script src="${pageContext.request.contextPath}/webjars/bootstrap/5.1.3/js/bootstrap.min.js">
</head>
<body>
<div class="container">
<div class="page-header mt-5">
<h3 class="text-center">新闻列表</h3>
</div>
<hr class="my-3">
<div class="row">
<div class="col-6">操作者：${sessionScope.operator.nickname}</div>
<div class="col-6 text-end">
<a href="${pageContext.request.contextPath}/Logout" class="btn btn-secondary">退出系统</a>
</div>
</div>
<hr class="my-3">
<table class="table table-bordered">
<thead>
<tr class="text-center">
<th>新闻编号</th>
<th>新闻标题</th>
<th>作者</th>
<th>发布时间</th>
<th>阅读量</th>
<th>操作</th>
</tr>
</thead>
<tbody>
<%--
items 遍历项
var 列表元素
varStatus 状态
index 列表索引
count 列表计数器
step 步长值为1
begin 起始索引
end 结束索引
--%>
<c:forEach items="${requestScope.newsList}" var="news">
<tr>
<td>${news.id}</td>
<td>${news.title}</td>
<td>${news.author}</td>
<td> <%--${news.date}--%><fmt:formatDate value="${news.date}" pattern="yyyy-MM-dd"/></td>
<td>${news.readCount}</td>
<td>
<a href="${pageContext.request.contextPath}/RemoveNewsById.do?id=${news.id}" class="btn btn-danger">删除</a>
<a href="${pageContext.request.contextPath}/ToAddNewsPage.do" class="btn btn-success">新增</a>
<a href="${pageContext.request.contextPath}/ToUpdateNewsPage.do?id=${news.id}" class="btn btn-info">修改</a>
</td>
</tr>
</c:forEach>
</tbody>
</table>
</div>
</body>
</html>
测试新闻列表Servlet
访问地址：http://localhost:6633/lhz/AllNews.do
登录Servlet
修改原的登录Servlet登场成功后的跳转地址
request.getRequestDispatcher("/AllNews.do").forward(request, response);
修改后完整代码
package com.lihaozhe.news.controller;
/** * @author 李昊哲 * @version 1.0.0 2022/6/10 上午8:41 */
import com.lihaozhe.news.dao.Newsdb;
import com.lihaozhe.news.dto.User;
import com.lihaozhe.news.vo.UserVo;
import jakarta.servlet.*;
import jakarta.servlet.http.*;
import jakarta.servlet.annotation.*;
import org.apache.commons.lang3.StringUtils;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
@WebServlet(name = "LoginServlet", value = "/LoginServlet")
public class LoginServlet extends HttpServlet {
private final static Newsdb instance = Newsdb.getInstance();
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String account = request.getParameter("account");
if (StringUtils.isEmpty(account)) {
request.setAttribute("msg", "账号不能为空");
request.getRequestDispatcher("/").forward(request, response);
return;
}
String password = request.getParameter("password");
if (StringUtils.isEmpty(password)) {
request.setAttribute("msg", "密码不能为空");
request.getRequestDispatcher("/").forward(request, response);
return;
}
List<User> userList = instance.getUserList();
Iterator<User> it = userList.listIterator();
while (it.hasNext()) {
User user = it.next();
if (user.getAccount().equals(account) && user.getPassword().equals(password)) {
UserVo userVo = new UserVo();
userVo.setAccount(user.getAccount());
userVo.setNickname(user.getNickname());
request.getSession().setAttribute("operator", userVo);
// request.getRequestDispatcher("/WEB-INF/view/newslist.jsp").forward(request, response);
request.getRequestDispatcher("/AllNews.do").forward(request, response);
return;
}
}
request.setAttribute("msg", "账号或者密码错误");
request.getRequestDispatcher("/").forward(request, response);
return;
}
}
测试登录后跳转新闻列表
访问地址：http://localhost:6633/lhz/
测试账号：admin
测试密码：123456
访问登录页面
新闻列表
新增新闻
1、新增按钮为a标签跳转后端路由 后端路由再跳转新增页面
2、在新增新闻页面输入新闻标题点击发布按钮向新闻标题发送给后端Servlet写入数据库
3、后端写入数据库后重新查询数据库列表信息并返回新闻列表
新增新闻按钮
<a href="${pageContext.request.contextPath}/ToAddNewsPage.do" class="btn btn-success">新增</a>
新增新闻页面后端路由
package com.lihaozhe.news.router;
/** * @author 李昊哲 * @version 1.0.0 2022/6/10 上午8:41 */
import jakarta.servlet.*;
import jakarta.servlet.http.*;
import jakarta.servlet.annotation.*;
import java.io.IOException;
@WebServlet(name = "ToAddNewsPage", value = "/ToAddNewsPage.do")
public class ToAddNewsPage extends HttpServlet {
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.getRequestDispatcher("/WEB-INF/view/addnews.jsp").forward(request,response);
}
}
新增新闻页面
文件位置src/main/webapp/WEB-INF/view/addnews.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>李昊哲-小课</title>
<link rel="stylesheet" href="${pageContext.request.contextPath}/webjars/bootstrap/5.1.3/css/bootstrap.min.css">
<script src="${pageContext.request.contextPath}/webjars/bootstrap/5.1.3/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container mb-t">
<div class="row">
<div class="col-6">操作者：${sessionScope.operator.nickname}</div>
<div class="col-6 text-end">
<a href="${pageContext.request.contextPath}/Logout" class="btn btn-secondary">退出系统</a>
</div>
</div>
<div class="row">
<div class="col-4"></div>
<div class="col-4">
<form action="${pageContext.request.contextPath}/AddNews.do" method="post">
<div class="form-group row mb-3">
标题： <input class="form-control" type="text" name="title" value="" autocomplete="off">
</div>
<div class="form-group row mb-3">
<div class="d-grid">
<button type="submit" class="btn btn-primary">发布</button>
</div>
</div>
</form>
</div>
<div class="col-4"></div>
</div>
</div>
</body>
</html>
新增新闻Servlet
package com.lihaozhe.news.controller;
/** * @author 李昊哲 * @version 1.0.0 2022/6/10 上午8:41 */
import com.lihaozhe.news.dao.Newsdb;
import com.lihaozhe.news.dto.News;
import com.lihaozhe.news.vo.UserVo;
import jakarta.servlet.*;
import jakarta.servlet.http.*;
import jakarta.servlet.annotation.*;
import java.io.IOException;
import java.util.Date;
import java.util.List;
@WebServlet(name = "AddNews", value = "/AddNews.do")
public class AddNews extends HttpServlet {
private static final long serialVersionUID = -1332560525247994566L;
private final static Newsdb instance = Newsdb.getInstance();
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
List<News> newsList = instance.getNewsList();
News news = new News();
String title = request.getParameter("title");
news.setTitle(title);
UserVo operator = (UserVo) request.getSession().getAttribute("operator");
news.setAuthor(operator.getNickname());
news.setDate(new Date());
newsList.add(news);
instance.setNewsList(newsList);
request.getRequestDispatcher("/AllNews.do").forward(request, response);
return;
}
}
测试新增新闻
访问新增新闻页面
在新闻列表点击新增按钮
输入新闻标题
发布新闻后访后自动跳转新闻列表
修改新闻
1、点击修改新闻按钮携带该新闻id跳转后端路由
2、后端路由从数据库中查询到该新闻信息
3、后端路由携带新闻信息跳转修改新闻页面
4、页面修改新闻后 携带该新闻id 将数据发送给后端Servlet
5、后端Servlet将修改后的信息存入数据库
6、查询数据库中的新闻列表后跳跳新闻列表页面
修改新闻按钮
<a href="${pageContext.request.contextPath}/ToUpdateNewsPage.do?id=${news.id}" class="btn btn-info">修改</a>
修改新闻后端路由
package com.lihaozhe.news.controller;
/** * @author 李昊哲 * @version 1.0.0 2022/6/10 上午8:41 */
import com.lihaozhe.news.dao.Newsdb;
import com.lihaozhe.news.dto.News;
import jakarta.servlet.*;
import jakarta.servlet.http.*;
import jakarta.servlet.annotation.*;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;
@WebServlet(name = "ToUpdateNewsPage", value = "/ToUpdateNewsPage.do")
public class ToUpdateNewsPage extends HttpServlet {
private static final long serialVersionUID = 6231273724806573111L;
private final static Newsdb instance = Newsdb.getInstance();
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String id = request.getParameter("id");
List<News> newsList = instance.getNewsList();
Iterator<News> it = newsList.listIterator();
News news = null;
while (it.hasNext()) {
News next = it.next();
if (String.valueOf(next.getId()).compareTo(id) == 0) {
news = next;
break;
}
}
request.setAttribute("news", news);
request.getRequestDispatcher("/WEB-INF/view/updatenews.jsp").forward(request, response);
}
}
修改新闻页面
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>李昊哲-小课</title>
<link rel="stylesheet" href="${pageContext.request.contextPath}/webjars/bootstrap/5.1.3/css/bootstrap.min.css">
<script src="${pageContext.request.contextPath}/webjars/bootstrap/5.1.3/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container mb-t">
<div class="row">
<div class="col-6">操作者：${sessionScope.operator.nickname}</div>
<div class="col-6 text-end">
<a href="${pageContext.request.contextPath}/Logout" class="btn btn-secondary">退出系统</a>
</div>
</div>
<div class="row">
<div class="col-4"></div>
<div class="col-4">
<form action="${pageContext.request.contextPath}/UpdateNews.do" method="post">
<div class="form-group row mb-3">
<input class="form-control" type="text" name="id" value="${requestScope.news.id}" autocomplete="off" readonly hidden>
</div>
<div class="form-group row mb-3">
标题： <input class="form-control" type="text" name="title" value="${requestScope.news.title}" autocomplete="off">
</div>
<div class="form-group row mb-3">
<div class="d-grid">
<button type="submit" class="btn btn-primary">发布</button>
</div>
</div>
</form>
</div>
<div class="col-4"></div>
</div>
</div>
</body>
</html>
修改新闻Servlet
传统编码方式
package com.lihaozhe.news.controller;
/** * @author 李昊哲 * @version 1.0.0 2022/6/10 上午8:41 */
import com.lihaozhe.news.dao.Newsdb;
import com.lihaozhe.news.dto.News;
import jakarta.servlet.*;
import jakarta.servlet.http.*;
import jakarta.servlet.annotation.*;
import java.io.IOException;
import java.util.List;
import java.util.stream.Collectors;
@WebServlet(name = "UpdateNews", value = "/UpdateNews.do")
public class UpdateNews extends HttpServlet {
private static final long serialVersionUID = 7817625721378462501L;
private final static Newsdb instance = Newsdb.getInstance();
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String id = request.getParameter("id");
String title = request.getParameter("title");
List<News> newsList = instance.getNewsList();
for (int i = 0; i < newsList.size(); i++) {
News news = newsList.get(i);
if (String.valueOf(news.getId()).compareTo(id) == 0) {
news.setTitle(title);
break;
}
}
instance.setNewsList(newsList);
request.getRequestDispatcher("/AllNews.do").forward(request, response);
return;
}
}
Stream API方式
// 传统编码
for (int i = 0; i < newsList.size(); i++) {
News news = newsList.get(i);
if (String.valueOf(news.getId()).compareTo(id) == 0) {
news.setTitle(title);
break;
}
}
// Stream API
newsList = newsList.stream().map(news -> {
if (String.valueOf(news.getId()).compareTo(id) == 0) {
news.setTitle(title);
}
return news;
}).collect(Collectors.toList());
修改后完整代码
package com.lihaozhe.news.controller;
/** * @author 李昊哲 * @version 1.0.0 2022/6/10 上午8:41 */
import com.lihaozhe.news.dao.Newsdb;
import com.lihaozhe.news.dto.News;
import jakarta.servlet.*;
import jakarta.servlet.http.*;
import jakarta.servlet.annotation.*;
import java.io.IOException;
import java.util.List;
import java.util.stream.Collectors;
@WebServlet(name = "UpdateNews", value = "/UpdateNews.do")
public class UpdateNews extends HttpServlet {
private static final long serialVersionUID = 7817625721378462501L;
private final static Newsdb instance = Newsdb.getInstance();
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String id = request.getParameter("id");
String title = request.getParameter("title");
List<News> newsList = instance.getNewsList();
// for (int i = 0; i < newsList.size(); i++) {
// News news = newsList.get(i);
// if (String.valueOf(news.getId()).compareTo(id) == 0) {
// news.setTitle(title);
// break;
// }
// }
newsList = newsList.stream().map(news -> {
if (String.valueOf(news.getId()).compareTo(id) == 0) {
news.setTitle(title);
}
return news;
}).collect(Collectors.toList());
instance.setNewsList(newsList);
request.getRequestDispatcher("/AllNews.do").forward(request, response);
return;
}
}
测试修改新闻
访问修改新闻页面
在新闻列表点击修改按钮
修改新闻
发布修改后的新闻自动跳转新闻列表
删除新闻
1、点击删除按钮 携带该新闻id 跳转后端删除Servlet
2、后端Servlet在数据库中删除该条新闻
3、删除新闻后跳转新闻列表
删除新闻按钮
<a href="${pageContext.request.contextPath}/RemoveNewsById.do?id=${news.id}" class="btn btn-danger">删除</a>
删除新闻Servlet
传统编码方式
package com.lihaozhe.news.controller;
/** * @author 李昊哲 * @version 1.0.0 2022/6/10 上午8:41 */
import com.lihaozhe.news.dao.Newsdb;
import com.lihaozhe.news.dto.News;
import jakarta.servlet.*;
import jakarta.servlet.http.*;
import jakarta.servlet.annotation.*;
import org.apache.commons.lang3.StringUtils;
import java.io.IOException;
import java.util.List;
import java.util.stream.Collectors;
@WebServlet(name = "RemoveNewsById", value = "/RemoveNewsById.do")
public class RemoveNewsById extends HttpServlet {
private static final long serialVersionUID = 1438029433243714106L;
private final static Newsdb instance = Newsdb.getInstance();
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String id = request.getParameter("id");
if (StringUtils.isEmpty(id)) {
request.getRequestDispatcher("/AllNews.do").forward(request, response);
return;
}
List<News> newsList = instance.getNewsList();
for (int i = 0; i < newsList.size(); i++) {
News news = newsList.get(i);
if (String.valueOf(news.getId()).compareTo(id) == 0) {
newsList.remove(i);
break;
}
}
instance.setNewsList(newsList);
request.getRequestDispatcher("/AllNews.do").forward(request, response);
return;
}
}
Stream API方式
// 传统编码
for (int i = 0; i < newsList.size(); i++) {
News news = newsList.get(i);
if (String.valueOf(news.getId()).compareTo(id) == 0) {
newsList.remove(i);
break;
}
}
// Stream API
newsList = newsList.stream().filter(news -> String.valueOf(news.getId()).compareTo(id) != 0).collect(Collectors.toList());
修改后完整代码
package com.lihaozhe.news.controller;
/** * @author 李昊哲 * @version 1.0.0 2022/6/10 上午8:41 */
import com.lihaozhe.news.dao.Newsdb;
import com.lihaozhe.news.dto.News;
import jakarta.servlet.*;
import jakarta.servlet.http.*;
import jakarta.servlet.annotation.*;
import org.apache.commons.lang3.StringUtils;
import java.io.IOException;
import java.util.List;
import java.util.stream.Collectors;
@WebServlet(name = "RemoveNewsById", value = "/RemoveNewsById.do")
public class RemoveNewsById extends HttpServlet {
private static final long serialVersionUID = 1438029433243714106L;
private final static Newsdb instance = Newsdb.getInstance();
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String id = request.getParameter("id");
if (StringUtils.isEmpty(id)) {
request.getRequestDispatcher("/AllNews.do").forward(request, response);
return;
}
List<News> newsList = instance.getNewsList();
// for (int i = 0; i < newsList.size(); i++) {
// News news = newsList.get(i);
// if (String.valueOf(news.getId()).compareTo(id) == 0) {
// newsList.remove(i);
// break;
// }
// }
newsList = newsList.stream().filter(news -> String.valueOf(news.getId()).compareTo(id) != 0).collect(Collectors.toList());
instance.setNewsList(newsList);
request.getRequestDispatcher("/AllNews.do").forward(request, response);
return;
}
}
测试修改新闻
访问新闻列表页面
在新闻列表点击删除按钮
删除后重新访问新闻列表
未登录处理
编写过滤器
package com.lihaozhe.news.filter;
/** * @author 李昊哲 * @version 1.0.0 2022/6/10 上午8:41 */
import jakarta.servlet.*;
import jakarta.servlet.annotation.*;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import jakarta.servlet.http.HttpSession;
import java.io.IOException;
@WebFilter(filterName = "Authentication", urlPatterns = {
"*.do", "*.action"})
public class Authentication implements Filter {
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain chain) throws ServletException, IOException {
HttpServletRequest request = (HttpServletRequest) servletRequest;
HttpServletResponse response = (HttpServletResponse) servletResponse;
request.setCharacterEncoding("UTF-8");
response.setCharacterEncoding("UTF-8");
response.setContentType("text/html;charset=utf-8");
HttpSession session = request.getSession();
if (session.getAttribute("operator") == null) {
request.setAttribute("msg", "请输入账号密码");
request.getRequestDispatcher("/").forward(request, response);
return;
}
chain.doFilter(request, response);
}
}
测试未登录
访问地址：http://localhost:6633/lhz/AllNews.do
代码优化
抽取冗余代码
抽取bootstrap引入
将bootstrap引入抽取到src/main/webapp/WEB-INF/commons/bootstrap.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<link rel="stylesheet" href="${pageContext.request.contextPath}/webjars/bootstrap/5.1.3/css/bootstrap.min.css">
<script src="${pageContext.request.contextPath}/webjars/bootstrap/5.1.3/js/bootstrap.min.js"></script>
将源代码中bootstrap引入替换
<jsp:include page="/WEB-INF/commons/bootstrap.jsp"></jsp:include>
抽取登录人显示信息和退出系统按钮
将 登录人显示信息和退出系统按钮抽 取到src/main/webapp/WEB-INF/commons/operator.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<div class="row">
<div class="col-6">操作者：${sessionScope.operator.nickname}</div>
<div class="col-6 text-end"><a href="${pageContext.request.contextPath}/Logout" class="btn btn-secondary">退出系统</a></div>
</div>
将 源代码中登录人显示信息和退出系统按钮 替换
<jsp:include page="/WEB-INF/commons/operator.jsp"></jsp:include>
登录页面
文件位置src/main/webapp/WEB-INF/view/login.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>李昊哲-小课</title>
<jsp:include page="/WEB-INF/commons/bootstrap.jsp"></jsp:include>
</head>
<body>
<div class="container" style="font-family: 微软雅黑">
<div class="page-header mt-5">
<h3 class="text-center">登录</h3>
</div>
<hr class="my-5">
<form action="${pageContext.request.contextPath}/LoginServlet" method="post">
<div class="form-group row mb-3">
<p class="col-5 lead text-end">账 号：</p>
<div class="col-3">
<input type="text" class="form-control" name="account" value="" placeholder="请输入账号" autocomplete="off">
</div>
</div>
<div class="form-group row mb-3">
<p class="col-5 lead text-end">密 码：</p>
<div class="col-3">
<input type="password" class="form-control" name="password" value="" placeholder="请输入密码">
</div>
</div>
<div class="row">
<p class="col-4 offset-4 text-center bg-danger text-white lead mb-3">${requestScope.msg}</p>
</div>
<div class="form-group row mb-3">
<div class="col-4 offset-4">
<div class="d-grid">
<button type="submit" class="btn btn-outline-success">登录系统</button>
</div>
</div>
</div>
</form>
</div>
</body>
</html>
新闻列表页面
文件位置src/main/webapp/WEB-INF/view/newslist.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<html>
<head>
<title>李昊哲-小课</title>
<jsp:include page="/WEB-INF/commons/bootstrap.jsp"></jsp:include>
</head>
<body>
<div class="container">
<div class="page-header mt-5">
<h3 class="text-center">新闻列表</h3>
</div>
<hr class="my-3">
<jsp:include page="/WEB-INF/commons/operator.jsp"></jsp:include>
<hr class="my-3">
<table class="table table-bordered">
<thead>
<tr class="text-center">
<th>新闻编号</th>
<th>新闻标题</th>
<th>作者</th>
<th>发布时间</th>
<th>阅读量</th>
<th>操作</th>
</tr>
</thead>
<tbody>
<%--
items 遍历项
var 列表元素
varStatus 状态
index 列表索引
count 列表计数器
step 步长值为1
begin 起始索引
end 结束索引
--%>
<c:forEach items="${requestScope.newsList}" var="news">
<tr>
<td>${news.id}</td>
<td>${news.title}</td>
<td>${news.author}</td>
<td> <%--${news.date}--%><fmt:formatDate value="${news.date}" pattern="yyyy-MM-dd"/></td>
<td>${news.readCount}</td>
<td>
<a href="${pageContext.request.contextPath}/RemoveNewsById.do?id=${news.id}" class="btn btn-danger">删除</a>
<a href="${pageContext.request.contextPath}/ToAddNewsPage.do" class="btn btn-success">新增</a>
<a href="${pageContext.request.contextPath}/ToUpdateNewsPage.do?id=${news.id}" class="btn btn-info">修改</a>
</td>
</tr>
</c:forEach>
</tbody>
</table>
</div>
</body>
</html>
新增新闻页面
文件位置src/main/webapp/WEB-INF/view/addnews.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>李昊哲-小课</title>
<jsp:include page="/WEB-INF/commons/bootstrap.jsp"></jsp:include>
</head>
<body>
<div class="container mb-t">
<jsp:include page="/WEB-INF/commons/operator.jsp"></jsp:include>
<div class="row">
<div class="col-4"></div>
<div class="col-4">
<form action="${pageContext.request.contextPath}/AddNews.do" method="post">
<div class="form-group row mb-3">
标题： <input class="form-control" type="text" name="title" value="" autocomplete="off">
</div>
<div class="form-group row mb-3">
<div class="d-grid">
<button type="submit" class="btn btn-primary">发布</button>
</div>
</div>
</form>
</div>
<div class="col-4"></div>
</div>
</div>
</body>
</html>
修改新闻页面
文件位置src/main/webapp/WEB-INF/view/updatenews.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>李昊哲-小课</title>
<jsp:include page="/WEB-INF/commons/bootstrap.jsp"></jsp:include>
</head>
<body>
<div class="container mb-t">
<jsp:include page="/WEB-INF/commons/operator.jsp"></jsp:include>
<div class="row">
<div class="col-4"></div>
<div class="col-4">
<form action="${pageContext.request.contextPath}/UpdateNews.do" method="post">
<div class="form-group row mb-3">
<input class="form-control" type="text" name="id" value="${requestScope.news.id}" autocomplete="off" readonly hidden>
</div>
<div class="form-group row mb-3">
标题： <input class="form-control" type="text" name="title" value="${requestScope.news.title}" autocomplete="off">
</div>
<div class="form-group row mb-3">
<div class="d-grid">
<button type="submit" class="btn btn-primary">发布</button>
</div>
</div>
</form>
</div>
<div class="col-4"></div>
</div>
</div>
</body>
</html>
今天的分享到此就结束了，感谢您的阅读，如果确实帮到您，您可以动动手指转发给其他人。
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