【转】UDP Socket编程-客户端和服务端双向通信

转自：http://www.myexception.cn/program/1045940.html

UDP Socket编程--客户端和服务端双向通信

最近写了个UDP通信，能够实现客户端和服务端的双向通信，和大家分享！ 
因为UDP是无连接通信，叫客户端和服务端是不准确的，应该叫发送端和接收端，因为我的代码能实现双向的通信，在接收信息的同时还能够发送信息，所以我叫做一端和另一端！

一端：

package test.udp;

import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetSocketAddress;
import java.net.SocketException;

/**
 * @author 
 * @version guchao
 * CreateTime：
 * Description：真正意义的UDP聊天，每端都可以不停地向另一端发送消息，也在不停地接收消息
 */
public class TestUDPServer2 {

	public static void main(String[] args) throws IOException {
		new TestUDPServer2().go();
	}
	
	private void go() {
		//服务端启动2个线程，1个发送，1个接收
		ServerSendThread send = new ServerSendThread();
		new Thread(send).start();
		
		ServerRecvThread recv = new ServerRecvThread();
		new Thread(recv).start();
	}

//	服务端发送线程
	class ServerSendThread implements Runnable{

		@Override
		public void run() {
			try {
				DatagramSocket ds = new DatagramSocket();
				String str = "";
				byte[] buf = null;
				while (true) {
					System.out.println("请输入>");
					BufferedReader br = new BufferedReader(
							new InputStreamReader(System.in));
					str = br.readLine();
					if ("bye".equals(str))
						break;
					buf = str.getBytes();

					DatagramPacket dp = new DatagramPacket(buf, buf.length,
							new InetSocketAddress("127.0.0.1", 5679));
					ds.send(dp);
					buf = null;
				}
				ds.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
			
		}
	}
	
//	服务端接收线程
	class ServerRecvThread implements Runnable{

		@Override
		public void run() {
			byte[] buf = new byte[1024];
			
			//接收端的端口需要指定，不然发送端不知道向哪个端口发送数据包
			DatagramSocket ds;
			try {
				ds = new DatagramSocket(5678);
			
				String message = "";
				while(true){
					DatagramPacket dp = new DatagramPacket(buf, buf.length);
					ds.receive(dp);
					
					message = new String(buf,0,dp.getLength());
					System.out.println("接收到Client端的信息为："+message);
				}
			} catch (IOException e) {
				e.printStackTrace();
			}
			
		}
	}
}

 

另一端：

package test.udp;

import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetSocketAddress;

/**
 * @author
 * @version guchao CreateTime：2010-11-29 上午08:57:52 Description：发送端
 */
public class TestUDPClient2 {
	public static void main(String[] args) throws IOException {
		new TestUDPClient2().go();
	}

	private void go() {
		ClientSendThread send = new ClientSendThread();
		new Thread(send).start();

		ClientRecvThread recv = new ClientRecvThread();
		new Thread(recv).start();
	}

	class ClientSendThread implements Runnable {

		@Override
		public void run() {
			try {
				DatagramSocket ds = new DatagramSocket();
				String str = "";
				byte[] buf = null;
				while (true) {
					System.out.println("请输入>");
					BufferedReader br = new BufferedReader(
							new InputStreamReader(System.in));
					str = br.readLine();
					if ("bye".equals(str))
						break;
					buf = str.getBytes();

//					System.out.println("-----buf.length-------" + buf.length);
					DatagramPacket dp = new DatagramPacket(buf, buf.length,
							new InetSocketAddress("127.0.0.1", 5678));
					ds.send(dp);
					buf = null;
				}
				ds.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}

	class ClientRecvThread implements Runnable {

		@Override
		public void run() {
			byte[] buf = new byte[1024];
			
			//接收端的端口需要指定，不然发送端不知道向哪个端口发送数据包
			DatagramSocket ds;
			try {
				ds = new DatagramSocket(5679);
			
				String message = "";
				DatagramPacket dp = null;
				while(true){
					dp = new DatagramPacket(buf, buf.length);
					ds.receive(dp);
					
					message = new String(buf,0,dp.getLength());
					System.out.println("接收到Server端信息为："+message);
				}
			} catch (IOException e) {
				e.printStackTrace();
			}
		}

	}

}

 

 

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