多线程图片下载

最新推荐文章于 2020-11-16 12:01:52 发布

原创最新推荐文章于 2020-11-16 12:01:52 发布 · 913 阅读

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本文介绍了一个基于Java的多线程图片服务器实现方案，能够同时为多个客户端提供图片下载服务。该服务器通过监听指定端口接收客户端连接请求，并为每个连接创建独立线程进行图片传输。客户端则负责接收并保存图片。

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package com.zyf.day24;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.HashSet;


/**
 * 编写一个服务端可以给多个客户端发送图片。（多线程）
 * @author root
 *
 */
public class ImageServer extends Thread{
	Socket socket;
	//使用该集合是用于存储ip地址的
	static HashSet<String> ips = new HashSet<String>();
	
	public ImageServer(Socket socket) {
		// TODO Auto-generated constructor stub
		this.socket = socket;
	}
    @Override
    public void run() {
    	// TODO Auto-generated method stub


			try {
				//获取到socket输出流对象
				OutputStream outputStream = socket.getOutputStream();
				//获取图片的输入流对象
				FileInputStream fileInputStream = new FileInputStream("C:\\1.jpg");
				//读取图片数据，把数据写出
				byte[] buf = new byte[1024];
				int length = 0;
				while((length = fileInputStream.read(buf))!=-1){
					outputStream.write(buf,0,length);
				}
				
				String ip = socket.getInetAddress().getHostAddress();//socket getInetAddress()获取对方的IP地址
				if(ips.add(ip)){
					System.out.println("恭喜" + ip + "同学成功下载" + ips);
				}
				System.out.println("下载的ip是：" + ip);
				//关闭资源
				fileInputStream.close();
			} catch (FileNotFoundException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
    }
    
	public static void main(String[] args) throws IOException {
		//建立tcp的服务，并且要监听一个端口
		ServerSocket serverSocket = new ServerSocket(9090);
		//接受用的的连接
		while(true){
			Socket socket = serverSocket.accept();
			new ImageServer(socket).start();
		}
	}
}

package com.zyf.day24;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.InetAddress;
import java.net.Socket;

//下载图片的客户端
public class ImageClient {

	public static void main(String[] args) throws IOException {
		// TODO Auto-generated method stub
       Socket socket = new Socket(InetAddress.getLocalHost(),9090);
       InputStream inputStream = socket.getInputStream();
       FileOutputStream fileOutputStream = new FileOutputStream("c:\\1.jpg");
       
       byte[] buf = new byte[1024];
       int length = 0;
       while((length = inputStream.read()) != -1){
    	   fileOutputStream.write(buf,0,length);
       }
       //关闭资源
       fileOutputStream.close();
       socket.close();
	}

}