1 package com.threadcopyfile;
2
3 /**
4 * @author lisj
5 * 实现多线程的同时复制
6 * 调用多个线程同时复制各自的模块
7 */
8 public class threadCopy {
9
10
11 public static void main (String args[]){
12
13 ThreadCopyFile a=new ThreadCopyFile(1); //实例化多个线程
14 ThreadCopyFile b=new ThreadCopyFile(2);
15 ThreadCopyFile c=new ThreadCopyFile(3);
16 Thread down1 = new Thread(a);
17 down1.start(); //启动线程1,2,3
18 Thread down2 = new Thread(b);
19 down2.start(); //
20 Thread down3 = new Thread(c);
21 down3.start();
22
23 }
24
25 }
1 package com.threadcopyfile;
2
3 import java.io.File;
4 import java.io.IOException;
5 import java.io.RandomAccessFile;
6
7 /**
8 * @author lisj
9 * 实现复制功能
10 * 当线程调用的时候开始复制
11 */
12 public class ThreadCopyFile extends Thread{
13
14 int i; //定义全局变量i，识别复制的模块数
15
16 ThreadCopyFile(int i)
17 {
18 this.i=i;
19 }
20
21
22 /**
23 * 文件复制函数
24 * 利用RandomAccessFile类实现文件的读和写
25 * 实现复制文件的功能
26 */
27 public void run() {
28
29 System.out.println("线程"+i+"运行中。。。");
30
31 File ofile=new File("e:/java乱码处理.txt");
32 File nfile=new File("e:/456.txt"); //定义目的路径以及文件名
33
34 try {
35
36 RandomAccessFile in=new RandomAccessFile(ofile,"rw");
37
38 long length=in.length()/3;
39
40 RandomAccessFile out=new RandomAccessFile(nfile,"rw");
41 int count=0;
42 int len=0;
43 byte[] b= new byte[2048];
44 in.seek(length*(i-1)); //设置读文件偏移位置
45 out.seek(length*(i-1)); //设置写文件偏移位置
46 while(((len=in.read(b))!=-1)&&(count<=(int)length)){ //读取文件内容设置写文件停止条件
47
48 out.write(b, 0, len);
49 count=count+len;
50
51 }//写出文件内容
52
53 } catch (IOException e) {
54
55 e.printStackTrace();
56 }
57
58 System.out.println("线程"+i+"复制完成！");
59 }
60
61 }
