packagecom.chen.io1;importjava.io.BufferedInputStream;importjava.io.BufferedOutputStream;importjava.io.FileInputStream;importjava.io.FileNotFoundException;importjava.io.FileOutputStream;importjava.io.IOException;importjava.io.InputStream;importjava.io.OutputStream;/* IO练习，一个复制视频的类
* 练习文件为大小1,443,621 字节的wmv视频文件
*@authorAdministrator
/
public classCopyVideo {/* 方法一
* 基础复制方法
* 使用InputStream，OutputStream
* 测试结果：基础复制花费时间：10367毫秒；
*@paramfromFileName
*@paramtoFileName*/
public static voidbaseCopyMethod(String fromFileName,String toFileName) {long startTime =System.currentTimeMillis();
InputStream in= null;
OutputStream out= null;try{
in= newFileInputStream(fromFileName);
out= newFileOutputStream(toFileName);inttempRead ;while((tempRead = in.read())>-1) {
out.write(tempRead);
out.flush();
}
}catch(FileNotFoundException e) {
e.printStackTrace();
}catch(IOException e) {
e.printStackTrace();
}finally{try{if(in!=null)in.close();if(out!=null)out.close();
}catch(IOException e) {
e.printStackTrace();
}
}long endTime =System.currentTimeMillis();long spendTime = endTime -startTime;
System.out.println("方法一，基础复制花费时间："+ spendTime + "毫秒；");
}/* 方法二
* 使用InputStream，OutputStream，并增加字节数组作为缓冲区，提升效率
* 方法二，增加缓存后复制用时：121毫秒
*@paramfromFileName
*@paramtoFileName*/
public static voidbaseCopyMethod2(String fromFileName,String toFileName) {long startTime =System.currentTimeMillis();
InputStream in= null;
OutputStream out= null;try{
in= newFileInputStream(fromFileName);
out= newFileOutputStream(toFileName);byte[] buf = new byte[102];//缓冲区数组，减少硬盘的读取操作
inttempRead ;while((tempRead=in.read(buf))>-1) {
out.write(buf);
out.flush();
}
}catch(FileNotFoundException e) {
e.printStackTrace();
}catch(IOException e) {
e.printStackTrace();
}finally{try{if(in!=null)in.close();if(out!=null)out.close();
}catch(IOException e) {
e.printStackTrace();
}
}long endTime =System.currentTimeMillis();long spendTime = endTime -startTime;
System.out.println("方法二，增加缓存后复制用时："+ spendTime + "毫秒");
}/* 方法三
* 方法三，使用BufferedInputStream和BufferedOutputStream
* 方法三，使用BufferedInputStream和BufferedOutputStream后复制用时：8268毫秒
*@paramfromFileName
*@paramtoFileName*/
public static voidbufferedCopyMethod(String fromFileName,String toFileName ) {long startTime =System.currentTimeMillis();
BufferedInputStream in= null;
BufferedOutputStream out= null;try{
in= new BufferedInputStream(newFileInputStream(fromFileName));
out= new BufferedOutputStream(newFileOutputStream(toFileName));intreadContent;while((readContent = in.read())!=-1) {
out.write(readContent);
out.flush();
}
}catch(FileNotFoundException e) {
e.printStackTrace();
}catch(IOException e) {
e.printStackTrace();
}finally{try{if(in!=null)in.close();if(out!=null)out.close();
}catch(IOException e) {
e.printStackTrace();
}
}long endTime =System.currentTimeMillis();long spendTime = endTime -startTime;
System.out.println("方法三，使用BufferedInputStream和BufferedOutputStream后复制用时："+ spendTime + "毫秒");
}/* 方法四
* 方法四，在BufferedInputStream和BufferedOutputStream基础上再次添加缓存数组
* 方法四，BufferedInputStream和BufferedOutputStream基础上添加缓存数组后复制用时：16毫秒
*@paramfromFileName
*@paramtoFileName*/
public static voidbufferedCopyMethod2(String fromFileName,String toFileName ) {long startTime =System.currentTimeMillis();
BufferedInputStream in= null;
BufferedOutputStream out= null;try{
in= new BufferedInputStream(newFileInputStream(fromFileName));
out= new BufferedOutputStream(newFileOutputStream(toFileName));intreadContent ;byte[] buf = new byte[1024];while((readContent=in.read(buf))!=-1) {
out.write(buf);
out.flush();
}
}catch(FileNotFoundException e) {
e.printStackTrace();
}catch(IOException e) {
e.printStackTrace();
}finally{try{if(in!=null)in.close();if(out!=null)out.close();
}catch(IOException e) {
e.printStackTrace();
}
}long endTime =System.currentTimeMillis();long spendTime = endTime -startTime;
System.out.println("方法四，BufferedInputStream和BufferedOutputStream基础上添加缓存数组后复制用时："+ spendTime + "毫秒");
}public static voidmain(String[] args) {
String fromFileName= "C:\Users\Administrator\Desktop\test.wmv";
String toFileName= "C:\Users\Administrator\Desktop\test1.wmv";//baseCopyMethod(fromFileName,toFileName);//baseCopyMethod2(fromFileName,toFileName);//bufferedCopyMethod(fromFileName,toFileName);
bufferedCopyMethod(fromFileName,toFileName);
}
}
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