java第四次作业

import java.io.BufferedInputStream;

import java.io.BufferedOutputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import org.junit.Test;

public class CopyFile {

@Test

public void testCopyFile(){

long start = System.currentTimeMillis();

String src="C:\\Users\\think\\Desktop\\Java作业4\\a.mp3";

String dest="C:\\Users\\think\\Desktop\\Java作业4\\b.mp3";

CopyFile(src,dest);

long end = System.currentTimeMillis();

System.out.print("花费的时间：" + (end - start)); }

private void CopyFile(String src, String dest) {

//使用缓冲流实现复制

BufferedInputStream bis = null;

BufferedInputStream bos = null; try {

//提供读入写入文件

File file1 = new File(src);

File file2 = new File(dest);

//创建相应的节点流

FileInputStream fis = new FileInputStream(file1);

FileOutputStream fos =new FileOutputStream(file2);

//将创建的节点流的对象传递给缓冲就的构造器中

BufferedInputStream bis1 = new BufferedInputStream(fis);

BufferedOutputStream bos1 = new BufferedOutputStream(fos);

//具体的实现文件复制的操作

byte[] b = new byte[1024];

//使用数组来实现传递，用1024个字节传递

int len;

while((len = bis1.read(b)) != -1){

bos1.write(b,0,len);

}

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace(); }finally{

//关闭流

if(bos != null){

try {

bos.close();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

if(bis != null){ try {

bis.close();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}

}

}