java网络编程(4)——udp实现聊天

最新推荐文章于 2025-09-07 20:26:04 发布

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最新推荐文章于 2025-09-07 20:26:04 发布

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CC 4.0 BY-SA版权

文章标签：网络 java

原文链接：http://www.cnblogs.com/sevenlin/p/sevenlin_chatdemo20150801.html

本文介绍了使用UDP协议实现在线聊天功能的简单模拟过程，包括发送端和接收端的代码实现，通过本地主机地址和端口号进行通信，实现基本的聊天效果。

　　UDP可以实现在线聊天功能，我这里就是简单模拟一下：
　　发送端：

package com.seven.udp;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;

public class CharByUpdSend implements Runnable {

    private DatagramSocket ds;

    public CharByUpdSend(DatagramSocket ds) {
        this.ds = ds;
    }

    @Override
    public void run() {
        try {
            // 输入
            BufferedReader bufr = new BufferedReader(new InputStreamReader(
                    System.in));

            String line = null;
            while ((line = bufr.readLine()) != null) {

                DatagramPacket dp = new DatagramPacket(line.getBytes(),
                        line.length(), InetAddress.getByName("127.0.0.1"),
                        10001);

                ds.send(dp);

            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

　　接收端：

package com.seven.udp;

import java.net.DatagramPacket;
import java.net.DatagramSocket;

public class CharByUpdReceive implements Runnable{
    
    private DatagramSocket ds ;
    public CharByUpdReceive(DatagramSocket ds) {
        this.ds = ds;
    }

    
    @Override
    public void run() {
        try{
            while(true){
                byte[] buf = new byte[1024];
                DatagramPacket dp = new DatagramPacket(buf, buf.length);
                ds.receive(dp);
                String data = new String(dp.getData(),0,dp.getLength());
                System.out.println(dp.getAddress()+"-->"+data);
            }
            
        }catch(Exception e){
            e.printStackTrace();
            throw new RuntimeException(e);
        }
    }
}

　　主程序：

package com.seven.udp;

import java.net.DatagramSocket;

public class CharDemo {

    
    public static void main(String[] args) throws Exception {
        
        DatagramSocket send = new DatagramSocket();
        DatagramSocket receive = new DatagramSocket(10001);
        
        new Thread(new CharByUpdSend(send)).start();
        new Thread(new CharByUpdReceive(receive)).start();
        
        
    }
}