多线程下载图片

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;

/*
1. 编写一个服务端可以给多个客户端发送图片。 （多线程）

*/
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) {
        this.socket = socket;
    }
    
    @Override
    public void run() {
        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("F:\\美女\\3.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，当前下载的人数是："+ ips.size());
            }
            
            
            
            //关闭资源
            fileInputStream.close();
            socket.close();
        }catch (IOException e) {
            
        }
    }
    
    
    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);
        while(true){
            //接受用户的链接。
            Socket socket = serverSocket.accept();
            new ImageServer(socket).start();
            
        }
    }

}

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

//下载图片的客户端
public class ImageClient {

    public static void main(String[] args) throws Exception{
        //建立tcp的服务
        Socket socket = new Socket(InetAddress.getLocalHost(),9090);
        //获取socket的输入流对象
        InputStream inputStream = socket.getInputStream();
        //获取文件的输出流对象
        FileOutputStream fileOutputStream = new FileOutputStream("F:\\3.jpg");
        //边读边写
        byte[] buf = new byte[1024];
        int length = 0 ; 
        while((length = inputStream.read(buf))!=-1){
            fileOutputStream.write(buf,0,length);
        }
        //关闭资源
        fileOutputStream.close();
        socket.close();
        
    }
    
}