Java UDP网络编程 简单实例

服务端代码

/**
 *UDPClient
 *@author Winty wintys@gmail.com
 *@version 2008-12-15
 */
import java.io.*;
import java.net.*;
class UDPClient{
    public static void main(String[] args)throws IOException{
        DatagramSocket client = new DatagramSocket();

        String sendStr = "Hello! I‘m Client";
        byte[] sendBuf;
        sendBuf = sendStr.getBytes();
        InetAddress addr = InetAddress.getByName("127.0.0.1");
        int port = 5050;
        DatagramPacket sendPacket 
            = new DatagramPacket(sendBuf ,sendBuf.length , addr , port);
        client.send(sendPacket);
        byte[] recvBuf = new byte[100];
        DatagramPacket recvPacket
            = new DatagramPacket(recvBuf , recvBuf.length);
        client.receive(recvPacket);
        String recvStr = new String(recvPacket.getData() , 0 ,recvPacket.getLength());
        System.out.println("收到:" + recvStr);
        client.close();
    }
}

客户端代码

/**
 *UDPClient
 *@author Winty wintys@gmail.com
 *@version 2008-12-15
 */
import java.io.*;
import java.net.*;
class UDPClient{
    public static void main(String[] args)throws IOException{
        DatagramSocket client = new DatagramSocket();

        String sendStr = "Hello! I‘m Client";
        byte[] sendBuf;
        sendBuf = sendStr.getBytes();
        InetAddress addr = InetAddress.getByName("127.0.0.1");
        int port = 5050;
        DatagramPacket sendPacket 
            = new DatagramPacket(sendBuf ,sendBuf.length , addr , port);
        client.send(sendPacket);
        byte[] recvBuf = new byte[100];
        DatagramPacket recvPacket
            = new DatagramPacket(recvBuf , recvBuf.length);
        client.receive(recvPacket);
        String recvStr = new String(recvPacket.getData() , 0 ,recvPacket.getLength());
        System.out.println("收到:" + recvStr);
        client.close();
    }
}

测试结果