udp通信简单实例

最新推荐文章于 2024-07-11 14:50:23 发布

vicious_net

最新推荐文章于 2024-07-11 14:50:23 发布

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分类专栏： JAVA

本文链接：https://blog.youkuaiyun.com/homedjy/article/details/8236628

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客户端：

import java.io.*;
import java.net.*;
import java.util.Scanner;
public class UDPClient{
public static void main(String[] args){	
		for(int i=1;i<5;i++){
		client();
		}
	}	
	public static void client(){
	 try {
      DatagramSocket ds = new DatagramSocket();
      System.out.println("输入消息(按Enter发送)");
	  Scanner in=new Scanner(System.in);
	  System.out.print("客户端：");
	  String xx=in.nextLine();	 
      DatagramPacket dp = new DatagramPacket(xx.getBytes(), xx.length(), InetAddress.getByName("localhost"), 6000);
      ds.send(dp);
      byte[] buf = new byte[1000];
      DatagramPacket dpRecv = new DatagramPacket(buf, 1000);
      ds.receive(dpRecv);
	  String output=new String(buf, 0, dpRecv.getLength());
      System.out.println("服务器端："+output);
      ds.close();
    }
    catch (Exception ex) {
      ex.printStackTrace();
    }
  }
}

服务器端：

import java.io.*;
import java.net.*;
import java.util.Scanner;
public class UDPServer{
	public static void main(String[] args){
		System.out.println("服务器已启动......");
		for(int i=1;i<5;i++){
		server();
		}
	}
	public  static void server(){
		try {
      DatagramSocket ds = new DatagramSocket(6000);
      byte[] buf = new byte[1000];
      DatagramPacket dp = new DatagramPacket(buf, 1000);
      ds.receive(dp);
	  String output=new String(buf, 0, dp.getLength());
      System.out.println("客户端："+output);
      System.out.println("输入消息(按Enter发送)");
	  Scanner in=new Scanner(System.in);
	  System.out.print("服务器端：");
	  String x=in.nextLine();	
      DatagramPacket dpSend = new DatagramPacket(x.getBytes(), x.length(), dp.getAddress(), dp.getPort());
      ds.send(dpSend);
      ds.close();
    }
    catch (Exception ex) {
      ex.printStackTrace();
    }
}
}