Java CLASSPATH\u8bbe\u7f6e<\/h1>\n<\/p><\/div>\n

\n CLASSPATH: <\/strong> CLASSPATH\u662f\u4e00\u4e2a\u73af\u5883\u53d8\u91cf\uff0cApplication ClassLoader\u4f7f\u7528\u5b83\u6765\u5b9a\u4f4d\u548c\u52a0\u8f7d.class\u6587\u4ef6\u3002 CLASSPATH\u5b9a\u4e49\u8def\u5f84\uff0c\u4ee5\u67e5\u627e\u4e0d\u662f\u6269\u5c55\u6216Java\u5e73\u53f0\u4e00\u90e8\u5206\u7684\u7b2c\u4e09\u65b9\u548c\u7528\u6237\u5b9a\u4e49\u7684\u7c7b\u3002\u8bbe\u7f6eCLASSPATH\u65f6\uff0c\u8bf7\u5305\u62ec\u6240\u6709\u5305\u542b.class\u6587\u4ef6\u548cJAR\u6587\u4ef6\u7684\u76ee\u5f55\u3002\n <\/div>\n
\n \u5982\u679c\u6ee1\u8db3\u4ee5\u4e0b\u6761\u4ef6\uff0c\u5219\u9700\u8981\u8bbe\u7f6eCLASSPATH:\n <\/div>\n
\u60a8\u9700\u8981\u52a0\u8f7d\u5f53\u524d\u76ee\u5f55\u6216\u4efb\u4f55\u5b50\u76ee\u5f55\u4e2d\u4e0d\u5b58\u5728\u7684\u7c7b\u3002<\/span>
\n \u60a8\u9700\u8981\u52a0\u8f7d\u4e0d\u5728\u6269\u5c55\u673a\u5236\u6307\u5b9a\u4f4d\u7f6e\u7684\u7c7b\u3002<\/span> <\/p>\n
\n CLASSPATH\u53d6\u51b3\u4e8e\u60a8\u6240\u8bbe\u7f6e\u7684CLASSPATH\u3002 CLASSPATH\u5728\u672b\u5c3e\u5177\u6709\u76ee\u5f55\u540d\u6216\u6587\u4ef6\u540d\u3002\u4ee5\u4e0b\u51e0\u70b9\u63cf\u8ff0\u4e86CLASSPATH\u7684\u7ed3\u5c3e\u3002\n <\/div>\n
\u5982\u679c\u662fJAR\u6216zip\uff0c\u5219\u8be5\u6587\u4ef6\u5305\u542b\u7c7b\u6587\u4ef6\uff0cCLASSPATH\u4ee5zip\u6216JAR\u6587\u4ef6\u7684\u540d\u79f0\u7ed3\u5c3e\u3002<\/span>
\n \u5982\u679c\u5c06\u7c7b\u6587\u4ef6\u653e\u5728\u672a\u547d\u540d\u7684\u7a0b\u5e8f\u5305\u4e2d\uff0c\u5219CLASSPATH\u4ee5\u5305\u542b\u7c7b\u6587\u4ef6\u7684\u76ee\u5f55\u7ed3\u5c3e\u3002<\/span>
\n \u5982\u679c\u5c06\u7c7b\u6587\u4ef6\u653e\u5728\u547d\u540d\u5305\u4e2d\uff0c\u5219CLASSPATH\u7684\u76ee\u5f55\u4ee5\u5b8c\u6574\u5305\u540d\u5305\u542b\u6839\u5305\uff0c\u8be5\u6839\u5305\u662f\u5b8c\u6574\u5305\u540d\u4e2d\u7684\u7b2c\u4e00\u4e2a\u5305\u3002<\/span> <\/p>\n
\n CLASSPATH\u7684\u9ed8\u8ba4\u503c\u4e3a\u70b9(.)\u3002\u8fd9\u610f\u5473\u7740\u4ec5\u641c\u7d22\u5f53\u524d\u76ee\u5f55\u3002\u8bbe\u7f6eCLASSPATH\u53d8\u91cf\u6216\u4f7f\u7528-classpath\u547d\u4ee4(\u7b80\u79f0-cp)\u65f6\uff0cCLASSPATH\u7684\u9ed8\u8ba4\u503c\u5c06\u88ab\u8986\u76d6\u3002\u5982\u679c\u8981\u5728\u641c\u7d22\u8def\u5f84\u4e2d\u5305\u542b\u5f53\u524d\u76ee\u5f55\uff0c\u8bf7\u5728\u65b0\u8bbe\u7f6e\u4e2d\u6dfb\u52a0\u70b9(.)\u3002\n <\/div>\n
\n \u5982\u679cCLASSPATH\u627e\u5230\u4e86\u5f53\u524d\u76ee\u5f55\u4e2d\u5b58\u5728\u7684\u7c7b\u6587\u4ef6\uff0c\u5219\u5b83\u5c06\u52a0\u8f7d\u8be5\u7c7b\n <\/div>\n
\n \u5982\u679c\u8981\u8bbe\u7f6e\u591a\u4e2a\u7c7b\u8def\u5f84\uff0c\u5219\u9700\u8981\u7528\u5206\u53f7(;)\u5206\u9694\u6bcf\u4e2aCLASSPATH\uff0c\u5e76\u4f7f\u7528\u5b83\uff0c\u800c\u4e0d\u7ba1\u540c\u4e00\u4e2a\u76ee\u5f55\u4e2d\u662f\u5426\u5b58\u5728\u76f8\u540c\u7684\u540d\u79f0\u7c7b\u3002\n <\/div>\n
\n <\/div>\n
\n \u4f7f\u7528JVM\u7684\u7b2c\u4e09\u65b9\u5e94\u7528\u7a0b\u5e8f(MySQL\u548cOracle)\u53ef\u4ee5\u4fee\u6539CLASSPATH\u73af\u5883\u53d8\u91cf\u4ee5\u5305\u62ec\u5b83\u4eec\u4f7f\u7528\u7684\u5e93\u3002\u8fd9\u4e9b\u7c7b\u53ef\u4ee5\u5b58\u50a8\u5728\u76ee\u5f55\u6216\u5f52\u6863\u6587\u4ef6\u4e2d\u3002 Java\u5e73\u53f0\u7684\u7c7b\u5b58\u50a8\u5728rt.jar\u4e2d\u3002\n <\/div>\n
\n \u8bbe\u7f6eCLASSPATH\u7684\u65b9\u6cd5\u6709\u4e24\u79cd: \u901a\u8fc7\u547d\u4ee4\u63d0\u793a\u7b26\u6216\u901a\u8fc7\u8bbe\u7f6e\u73af\u5883\u53d8\u91cf\u3002\n <\/div>\n
\n \u8ba9\u6211\u4eec\u770b\u770b\u5982\u4f55\u8bbe\u7f6eMySQL\u6570\u636e\u5e93\u7684CLASSPATH:\n <\/div>\n
\n \u6b65\u9aa41: <\/strong>\u5355\u51fbWindows\u6309\u94ae\u5e76\u9009\u62e9\"\u63a7\u5236\u9762\u677f\"\u3002\u9009\u62e9\u7cfb\u7edf\u3002\n <\/div>\n
$Java CLASSPATH\u8bbe\u7f6e_https:\/\/bianchenghao6.com_\u3010Java \u57fa\u7840\u6559\u7a0b\u3011_\u7b2c1\u5f20$ <\/p>\n
\n \u6b65\u9aa42: <\/strong>\u5355\u51fb
\n \u9ad8\u7ea7\u7cfb\u7edf\u8bbe\u7f6e<\/strong>\u3002\n <\/div>\n
$Java CLASSPATH\u8bbe\u7f6e_https:\/\/bianchenghao6.com_\u3010Java \u57fa\u7840\u6559\u7a0b\u3011_\u7b2c2\u5f20$ <\/p>\n
\n \u7b2c3\u6b65: <\/strong>\u3002\u5c06\u6253\u5f00\u4e00\u4e2a\u5bf9\u8bdd\u6846\u3002\u5355\u51fb\u73af\u5883\u53d8\u91cf\u3002\n <\/div>\n
$Java CLASSPATH\u8bbe\u7f6e_https:\/\/bianchenghao6.com_\u3010Java \u57fa\u7840\u6559\u7a0b\u3011_\u7b2c3\u5f20$ <\/p>\n
\n \u6b65\u9aa44: <\/strong>\u5982\u679cCLASSPATH\u5df2\u5b58\u5728\u4e8e\u7cfb\u7edf\u53d8\u91cf\u4e2d\uff0c\u8bf7\u5355\u51fb\"\u7f16\u8f91\"\u6309\u94ae\uff0c\u7136\u540e\u5728\u672b\u5c3e\u6dfb\u52a0\u5206\u53f7(;)\u3002\u7c98\u8d34MySQL-Connector Java.jar\u6587\u4ef6\u7684\u8def\u5f84\u3002\n <\/div>\n
\n \u5982\u679c\u7cfb\u7edf\u53d8\u91cf\u4e2d\u4e0d\u5b58\u5728CLASSPATH\uff0c\u8bf7\u5355\u51fb\"\u65b0\u5efa\"\u6309\u94ae\uff0c\u7136\u540e\u5c06\u53d8\u91cf\u540d\u8f93\u5165CLASSPATH\uff0c\u5c06\u53d8\u91cf\u503c\u8f93\u5165\u5230
\n C\u3002 : \\ Program Files \\ Java \\ jre1.8 \\ MySQL-Connector Java.jar;\u3002; <\/em>\n <\/div>\n
\n \u8bb0\u4f4f: \u653e\u5165;\u3002;\u5728CLASSPATH\u7684\u672b\u5c3e\u3002\n <\/div>\n
$Java CLASSPATH\u8bbe\u7f6e_https:\/\/bianchenghao6.com_\u3010Java \u57fa\u7840\u6559\u7a0b\u3011_\u7b2c4\u5f20$ <\/p>\n
PATH\u548cCLASSPATH\u4e4b\u95f4\u7684\u533a\u522b<\/h2>\n\n\n\n\n\n\n\n
PATH <\/td>\n CLASSPATH <\/td>\n<\/tr>\n
PATH\u662f\u4e00\u4e2a\u73af\u5883\u53d8\u91cf\u3002<\/td>\n CLASSPATH\u4e5f\u662f\u4e00\u4e2a\u73af\u5883\u53d8\u91cf\u3002<\/td>\n<\/tr>\n
\u64cd\u4f5c\u7cfb\u7edf\u4f7f\u7528\u5b83\u6765\u67e5\u627e\u53ef\u6267\u884c\u6587\u4ef6(.exe)\u3002<\/td>\n Application ClassLoader\u4f7f\u7528\u5b83\u5b9a\u4f4d.class\u6587\u4ef6\u3002<\/td>\n<\/tr>\n
\u60a8\u9700\u8981\u5305\u62ec\u5305\u542b.exe\u6587\u4ef6\u7684\u76ee\u5f55\u3002<\/td>\n \u60a8\u9700\u8981\u5305\u62ec\u6240\u6709\u5305\u542b.class\u548cJAR\u6587\u4ef6\u7684\u76ee\u5f55\u3002<\/td>\n<\/tr>\n
PATH\u73af\u5883\u53d8\u91cf\u4e00\u65e6\u8bbe\u7f6e\uff0c\u5c31\u4e0d\u80fd\u8986\u76d6\u3002<\/td>\n \u53ef\u4ee5\u4f7f\u7528javac\u548cjava\u547d\u4ee4\u7684\u547d\u4ee4\u884c\u9009\u9879-cp\u6216-CLASSPATH\u8986\u76d6CLASSPATH\u73af\u5883\u53d8\u91cf\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\u5982\u4f55\u5728Windows\u4e2d\u4f7f\u7528\u547d\u4ee4\u63d0\u793a\u7b26\u8bbe\u7f6eCLASSPATH <\/h2>\n
\n \u5728\u547d\u4ee4\u63d0\u793a\u7b26\u4e2d\u952e\u5165\u4ee5\u4e0b\u547d\u4ee4\uff0c\u7136\u540e\u6309Enter\u3002\n <\/div>\n
\n
set CLASSPATH=%CLASSPATH%;C:\\Program Files\\Java\\jre1.8\\rt.jar; <\/span><\/code><\/pre>\n<\/p><\/div>\n\n \u5728\u4e0a\u9762\u7684\u547d\u4ee4\u4e2d\uff0c\u8be5\u96c6\u5408\u662f\u5185\u90e8DOS\u547d\u4ee4\uff0c\u5141\u8bb8\u7528\u6237\u66f4\u6539\u53d8\u91cf\u503c\u3002 CLASSPATH\u662f\u53d8\u91cf\u540d\u3002\u7528\u767e\u5206\u53f7(\uff05)\u62ec\u8d77\u6765\u7684\u53d8\u91cf\u662f\u73b0\u6709\u7684\u73af\u5883\u53d8\u91cf\u3002\u5206\u53f7\u662f\u5206\u9694\u7b26\uff0c\u5728(;)\u4e4b\u540e\u662frt.jar\u6587\u4ef6\u7684\u8def\u5f84\u3002\n <\/div>\n ext\u6587\u4ef6\u5939\u5728Java\u4e2d\u7684\u5de5\u4f5c\u65b9\u5f0f<\/h2>\n\n ext\u76ee\u5f55\u7684\u5de5\u4f5c\u539f\u7406\u7c7b\u4f3c\u4e8eCLASSPATH\u3002 ext\u76ee\u5f55\u662f\u7c7b\u52a0\u8f7d\u673a\u5236\u7684\u4e00\u90e8\u5206\u3002 ext\u76ee\u5f55\u7684JAR\u4e2d\u53ef\u7528\u7684\u7c7b\u53ef\u7528\u4e8eJava\u5e94\u7528\u7a0b\u5e8f\u3002\n <\/div>\n\n \u4e0b\u8868\u8bf4\u660e\u4e86CLASSPATH\u548c\u6269\u5c55\u673a\u5236\u4e4b\u95f4\u7684\u4e3b\u8981\u533a\u522b:\n <\/div>\n\n\n\n\n\n\n\n\u7279\u5f81<\/td>\n CLASSPATH <\/td>\n \u6269\u5c55\u673a\u5236<\/td>\n<\/tr>\n \u7c7b\u52a0\u8f7d\u987a\u5e8f<\/td>\n \u5728\u52a0\u8f7d\u5f15\u5bfc\u7a0b\u5e8f\u548c\u6269\u5c55\u540d\u4e4b\u540e\u52a0\u8f7dCLASSPATH\u3002<\/td>\n ext\u4f1a\u5728\u5f15\u5bfc\u52a0\u8f7d\u540e\u4f46CLASSPATH\u52a0\u8f7d\u4e4b\u524d\u52a0\u8f7d\u3002<\/td>\n<\/tr>\n \u8303\u56f4<\/td>\n \u8fd9\u662f\u7279\u5b9a\u4e8e\u5e94\u7528\u7a0b\u5e8f\u7684\u3002\u4e3b\u673a\u4e0a\u7684\u6240\u6709JRE\u90fd\u662fCLASSPATH\u73af\u5883\u53d8\u91cf\u3002<\/td>\n \u6240\u6709JVM\u90fd\u5728\u7279\u5b9a\u7684JRE java.ext.dirs\u4e2d\u8fd0\u884c\u3002<\/td>\n<\/tr>\n \u5305\u88f9\u540d\u79f0<\/td>\n java.class.path\u7528\u4e8e\u67e5\u627e\u5305\u542b\u7c7b\u6587\u4ef6\u7684\u76ee\u5f55\u548cJAR\u5f52\u6863\u6587\u4ef6\u3002<\/td>\n java.ext.dirs\u7528\u4e8e\u6307\u5b9a\u6269\u5c55\u673a\u5236\u5728\u4f55\u5904\u52a0\u8f7d\u7c7b\u3002<\/td>\n<\/tr>\n \u89c4\u683c<\/td>\n \u7531\u540d\u79f0\u6307\u5b9a\uff0c\u5305\u62ecextension.jar\u548c\u5305\u542b.class\u6587\u4ef6\u7684\u76ee\u5f55\u3002<\/td>\n \u6307\u5b9a\u76ee\u5f55\u4e2d\u7684\u6240\u6709JAR\u6587\u4ef6\u90fd\u5df2\u52a0\u8f7d\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n \u8be5\u673a\u5236\u5c06\u4ece\u6269\u5c55\u76ee\u5f55\u4e2d\u62fe\u53d6\u6240\u6709.jar\u6587\u4ef6\uff0c\u5373\u4f7f\u8be5\u6587\u4ef6\u4e0d\u5177\u6709.jar\u6269\u5c55\u540d\u3002\u8fd9\u6837\u505a\u7684\u5b9e\u73b0\u662f\uff0c\u5982\u679c\u53ef\u4ee5\u66f4\u6539\u653e\u7f6e\u5728\u7c7b\u8def\u5f84\u76ee\u5f55\u4e2d\u7684jar\u7684\u540d\u79f0\uff0c\u4f7f\u5176\u5177\u6709.jar\u4ee5\u5916\u7684\u6269\u5c55\u540d\u3002\u901a\u914d\u7b26(*)\u4e0d\u8d77\u4f5c\u7528\u3002\u6b64\u6280\u672f\u4e0d\u9002\u7528\u4e8e\u6269\u5c55\u76ee\u5f55\u3002\n <\/div>\n\n \u8ba9\u6211\u4eec\u901a\u8fc7\u793a\u4f8b\u4e86\u89e3\u6267\u884c\u8fc7\u7a0b\u3002\n <\/div>\n\n A.java <\/strong>\n <\/div>\n\n public<\/span> class<\/span> A { public<\/span> String toString() { return<\/span> \"hello\"; } } <\/span><\/code><\/pre>\n<\/p><\/div>\n\n B.java <\/strong>\n <\/div>\n\n public<\/span> class<\/span> B { public<\/span> static<\/span> void<\/span> main(final<\/span> String[] args) { System.out.println(new<\/span> A()); } } <\/span><\/code><\/pre>\n<\/p><\/div>\n\n \u7f16\u8bd1A.java\u6587\u4ef6\u3002\u6211\u4eec\u5c06\u5df2\u7f16\u8bd1\u7684A.class\u6587\u4ef6\u5b58\u6863\u5230A.jar\u4e2d\u3002\u5c06\u6b64JAR\u6587\u4ef6\u653e\u7f6e\u5230\u5df2\u7f16\u8bd1\u7684B.class\u6587\u4ef6\u4e4b\u5916\u7684\u53e6\u4e00\u4e2a\u76ee\u5f55\u4e2d\u3002\n <\/div>\n\n \u4e3a\u6f14\u793a\u7c7b\u8def\u5f84\u7684\u4f7f\u7528\uff0c\u6211\u4eec\u5c06A.jar\u6587\u4ef6\u653e\u7f6e\u5728\u76ee\u5f55C:\\JavaPrograms\u4e2d\uff0c\u5e76\u5c06\u901a\u8fc7\u4ee5\u4e0b\u65b9\u5f0f\u8bbf\u95ee\u8be5JAR: \u901a\u914d\u7b26(*)\u4f9bB\u4f7f\u7528\u3002\n <\/div>\n\n \u6211\u4eec\u53d1\u73b0\uff0c\u5f53\u6211\u4eec\u4ece\u5f53\u524d\u76ee\u5f55\u4e2d\u5220\u9664A.class\u65f6\uff0cB\u4ecd\u7136\u53ef\u4ee5\u52a0\u8f7dA.class\u3002 Java\u542f\u52a8\u5668\u5df2\u660e\u786e\u5bfb\u627eC: \\ JavaProgram\u3002\u4e5f\u53ef\u4ee5\u5728\u4e0d\u5b58\u5728\u76f8\u540c\u76ee\u5f55\u548c\u660e\u786e\u7684\u7c7b\u8def\u5f84\u89c4\u8303\u7684\u60c5\u51b5\u4e0b\u52a0\u8f7d\u8be5\u7c7b\u3002\n <\/div>\n\n \u4f7f\u7528\u6269\u5c55\u673a\u5236\u901a\u5e38\u88ab\u79f0\u4e3a\u597d\u5904\uff0c\u56e0\u4e3a\u6240\u6709\u4f7f\u7528\u8be5JRE\u7684\u5e94\u7528\u7a0b\u5e8f\u90fd\u53ef\u4ee5\u65e0\u9700\u5728\u7c7b\u8def\u5f84\u4e0a\u663e\u5f0f\u6307\u5b9a\u5b83\u4eec\u5373\u53ef\u770b\u5230\u76f8\u540c\u7684\u7c7b\u3002\n <\/div>\n\n \u5982\u679c\u5728\u540c\u4e00CLASSPATH\u5f15\u7528\u7684\u76ee\u5f55\u4e2d\u5c06A.jar\u7684\u540d\u79f0\u66f4\u6539\u4e3aA.backup\uff0c\u4f1a\u53d1\u751f\u4ec0\u4e48\u60c5\u51b5\u3002\u5f53\u6211\u4eec\u8fd9\u6837\u505a\u65f6\u4f1a\u9047\u5230NoClassDefFoundError\uff0c\u56e0\u4e3aCLASSPATH\u5f15\u7528\u6ca1\u6709.jar\u6269\u5c55\u540d\u3002\n <\/div>\n <\/body> \n<\/html><\/p>\n","protected":false},"excerpt":{"rendered":"Java CLASSPATH\u8bbe\u7f6ezh-cn","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[111],"tags":[],"class_list":["post-695","post","type-post","status-publish","format-standard","hentry","category-java-jichu"],"_links":{"self":[{"href":"https:\/\/bianchenghao6.com\/wp-json\/wp\/v2\/posts\/695"}],"collection":[{"href":"https:\/\/bianchenghao6.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/bianchenghao6.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/bianchenghao6.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/bianchenghao6.com\/wp-json\/wp\/v2\/comments?post=695"}],"version-history":[{"count":0,"href":"https:\/\/bianchenghao6.com\/wp-json\/wp\/v2\/posts\/695\/revisions"}],"wp:attachment":[{"href":"https:\/\/bianchenghao6.com\/wp-json\/wp\/v2\/media?parent=695"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/bianchenghao6.com\/wp-json\/wp\/v2\/categories?post=695"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/bianchenghao6.com\/wp-json\/wp\/v2\/tags?post=695"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}