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package com.ff;

import java.io.*;
import java.util.RandomAccess;

public class Demo{
public static void main(String[] args) throws Exception{
File srcFile=new File("源文件路徑");
File orgFile=new File("目標(biāo)文件路徑");
//orgFile.createNewFile();
Demo demo=new Demo();
demo.analysisFile(srcFile,orgFile,4);//4為線程數(shù)，你也可以修改為其他數(shù)值
}

public void analysisFile(File srcFile,File orgFile,int threadNum){
int length=(int)srcFile.length();
int splitNum=length%threadNum==0?length/threadNum:length/threadNum+1;
int skipPostion=-1;
int readNum=0;
for(int i=1;i<=threadNum;i++){
if(i!=threadNum){
readNum=i*splitNum;
}
else{
readNum=length-readNum;
}

new SplitFile(srcFile,orgFile,skipPostion+1,readNum).start();

skipPostion=i*splitNum;
}
}

class SplitFile extends Thread{
private int minPosition;
private int maxPosition;
private File srcFile;
private File orgFile;

public SplitFile(File srcFile,File orgFile,int minPosition,int maxPosition){
this.maxPosition=maxPosition;
this.minPosition=minPosition;
this.srcFile=srcFile;
this.orgFile=orgFile;
}

public void run(){
try{
RandomAccessFile raf_r=new RandomAccessFile(srcFile,"rw");
RandomAccessFile raf_w=new RandomAccessFile(orgFile,"rw");

raf_r.skipBytes(minPosition);
raf_w.seek(minPosition);

byte[] buf=new byte[1];
int alreadyRec=0;
for(int size=0;alreadyRec<=maxPosition&&size!=-1;size=raf_r.read(buf)){
alreadyRec+=size;
raf_w.write(buf,0,size);
}

raf_w.close();
raf_r.close();

System.out.println("總共:"+srcFile.length()+" 文件"+srcFile.getName()+"從:"+minPosition+"開始---復(fù)制大小:"+maxPosition+"結(jié)束!此刻接收文件大小為:"+orgFile.length());
}
catch(Exception ex){
ex.printStackTrace();
}
}

}
}