文件的拷贝

用一个线程来控制文件的拷贝，另一个线程来控制拷贝的进度

package com.softeem.thread;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.text.DecimalFormat;
import java.util.RandomAccess;

/**
 * 使用一个线程进行文件拷贝，另一个子线程返回当前拷贝的进度 （守护线程）
 * @author LuFeng
 *
 */
public class ThreadDemo extends Thread{
	
	private File source;
	private File dir;

	public ThreadDemo(File source, File dir) {
		super();
		this.source = source;
		this.dir = dir;
	}
	RandomAccessFile ra_in=null;
	RandomAccessFile ra_out=null;
	@Override
	public void run() {
		try {
			long current=0;
			ra_in=new RandomAccessFile(source, "r");
			ra_out=new RandomAccessFile(dir, "rw");
			byte[] b=new byte[1024];
			int len=0;
			System.out.println("开始拷贝。。。。");
			ThreadDeno td=new ThreadDeno(source.length(), current);
			td.start();
			while((len=ra_in.read(b))!=-1) {
				ra_out.write(b,0,len);
				current+=len;
				//设置当前的进度
				td.setCurrent(current);
			}
			System.out.println("拷贝完成。。。。");
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}finally {
			try {
				if (ra_in!=null) {
					ra_in.close();
				}
				if (ra_out!=null) {
					ra_out.close();
				}
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}
	/**
	 * 守护进程的线程
	 * @author LuFeng
	 *
	 */
	class ThreadDeno extends Thread{
		
		private long total;
		private long current;

		public ThreadDeno(long total, long current) {
			super();
			this.total = total;
			this.current = current;
		}
		public long getCurrent() {
			return current;
		}
		public void setCurrent(long current) {
			this.current = current;
		}
		@Override
		public void run() {
			while(current<total) {
				double a=(double)current/total;
				//将小数格式化成百分数
				DecimalFormat df=(DecimalFormat) DecimalFormat.getPercentInstance();
				String str=df.format(a);
				System.out.println("当前进度:"+str);
			}
		}
	}
	
	public static void main(String[] args) {
		File source=new File("F:\\迅雷下载\\hello\\video1.mp4");
		File dir=new File("F:\\迅雷下载\\word1\\video.mp4");
		ThreadDemo t=new ThreadDemo(source, dir);
		t.start();
	}
	

}