Java Socket例程3 UDP

灰太狼 2021-11-27 07:42 179阅读 0赞

UdpSend.java

import java.io.IOException;
    import java.net.DatagramPacket;
    import java.net.DatagramSocket;
    import java.net.InetAddress;
    import java.net.SocketException;
    import java.net.UnknownHostException;
    
    
    public class UdpSend {
        
    public static void main(String args[]){
        
            DatagramSocket ds = null;
            DatagramPacket dp = null;
    try{
        
                ds = new DatagramSocket(3000); //实例化一个UDP的套接字并绑定3000绑定
            }catch(SocketException e){
        
    
            }
            String str = "hello world";
    try{
        
                dp = new DatagramPacket(str.getBytes(),str.length(),InetAddress.getByName("localhost"),9000);
            }
    catch(UnknownHostException ex1){
        
    
            }
    try{
        
                ds.send(dp);   //发送数据到本机的9000
                
            }catch(IOException e){
        
    
            }
            ds.close();
        }
    }

UdpReceive.java

import java.io.IOException;
    import java.net.DatagramPacket;
    import java.net.DatagramSocket;
    
    
    public class UdpReceive {
        
    public static void main(String args[]){
        
            DatagramSocket ds = null; //创建一个套接字对象
            byte[] buf = new byte[1024]; //实例化一个数组
            DatagramPacket dp = null; //创建一个套接字结构对象
            try{
        
                ds = new DatagramSocket(9000);//实例化并绑定端口        
            }
    catch(IOException e){
        
    
            }
    
            dp = new DatagramPacket(buf,1024);
    try{
        
                ds.receive(dp);//接收数据并存放在dp中
            }
    catch(IOException e2){
        
    
            }
            String str = new String(dp.getData(),0,dp.getLength()) +" from " +dp.getAddress().getHostAddress()+":"+dp.getPort();
            System.out.println(str); //打印接收到的内容
            ds.close();
        }
    }

转载于:https://www.cnblogs.com/hnrainll/archive/2011/12/17/2291094.html