Multi-thread copying folder and multi-thread copying

Multi-thread copying folder and multi-thread copying

import java.io.*;import java.util.Scanner;/** * Created by Admin on 2018/3/16. */public class MutiFilesCopy implements Runnable{    @Override    public void run() {        String fromDir="D:\\lucene\\data";        String toDir="D:\\lucene\\out";            try {                copyDir(fromDir,toDir);                System.out.println("copy:"+Thread.currentThread().getName());            } catch (IOException e) {                e.printStackTrace();        }    }    public void copyDir(String fromDir, String toDir) throws IOException {       File f=new File(fromDir);       String[] fs=f.list();       if(!new File(toDir).exists()){           System.out.println("mkdirThread:"+Thread.currentThread().getName());           new File(toDir).mkdir();       }       for(int i=0;i<fs.length;i++){           synchronized ("") {               System.out.println("copyDir:"+Thread.currentThread().getName());               if ((new File(fromDir + f.separator + fs[i])).isDirectory()) {                   copyDir(fromDir + f.separator + fs[i], toDir + f.separator + fs[i]);               }               if ((new File(fromDir + f.separator + fs[i])).isFile()) {                   copyFile(fromDir + f.separator + fs[i], toDir + f.separator + fs[i]);               }           }       }   }    private void copyFile(String sourceDir, String targetDir) throws IOException {       File sourcefile=new File(sourceDir);       File targetfile=new File(targetDir);       FileInputStream in=new FileInputStream(sourcefile);       FileOutputStream out=new FileOutputStream(targetfile);       byte[] b=new byte[2097152]; //2g        System.out.println("copyfileThread:"+Thread.currentThread().getName());       while ((in.read(b))!=-1){           out.write(b);       }    }}

 

 

/** * Created by Admin on 2018/3/16. */public class Testcopy {    public static void main(String[] args) {        MutiFilesCopy m=new MutiFilesCopy();        Thread a=new Thread(m);        Thread b=new Thread(m);        Thread c=new Thread(m);        a.start();        b.start();        c.start();    }}