java UDP 入门

udp编程相对于tcp编程要简单一些，主要用到的两个类是，DatagramSocket和DatagramPacket，服务端创建socket，绑定ip和端口，就可以用DatagramPacket接收数据和发送数据，代码如下：

服务器端：

package com.ppt.socket;

import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetSocketAddress;
import java.net.SocketAddress;

public class UDPServer {

	private static String hostname = "127.0.0.1";
	private static int port = 9999;
	public static void main(String[] args) throws Exception {
		SocketAddress bindaddr = new InetSocketAddress(hostname, port);
		DatagramSocket socket = new DatagramSocket(bindaddr);
		byte[] rBuf = new byte[1024];
		DatagramPacket packet = new DatagramPacket(rBuf, 0, rBuf.length);
		socket.receive(packet);
		System.out.println("result: "+new String(rBuf, 0, packet.getLength()));
		rBuf = "hello client".getBytes();
		DatagramPacket send = new DatagramPacket(rBuf, rBuf.length, packet.getAddress(), packet.getPort());
		socket.send(send);
	}

}

客服端：

package com.ppt.socket;

import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetSocketAddress;
import java.net.SocketAddress;

public class UDPClient {

	private static String hostname = "127.0.0.1";
	private static int port = 9999;
	public static void main(String[] args) throws Exception {
		DatagramSocket socket = new DatagramSocket();
		SocketAddress addr = new InetSocketAddress(hostname, port);
		byte[] sBuf = "hello server".getBytes();
		DatagramPacket sendPacket = new DatagramPacket(sBuf, sBuf.length, addr);
		socket.send(sendPacket);
		byte[] rBuf = new byte[1024];
		DatagramPacket rPacket = new DatagramPacket(rBuf, sBuf.length);
		socket.receive(rPacket);
		System.out.println("reuslt: " + new String(rBuf, 0, rPacket.getLength()));
	}

}

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