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/*

使用UDP模式,编写一个聊天程序

有发送和接收数据2部分,

一个线程接收,一个线程发送

由于发送和接收动作是不一致的,所以要使用2个run方法

而且这两个方法要封装到不同的类中

本程序忽略了部分异常的处理,也未加入UI组件

这样比较简洁

发送端口9998

接受端口9999

用的是局域网广播地址,所以自己发的消息自己也收到了

[示例]:简易控制台聊天程序

*/

import java.net.*;

import java.io.*;

class Demo

{

public static void main(String[] args) throws Exception

{

DatagramSocket sendSocket = new DatagramSocket(9998); //发送端

DatagramSocket receSocket = new DatagramSocket(9999); //接收端

new Thread(new MsgSend(sendSocket)).start(); //发送线程

new Thread(new MsgRece(receSocket)).start(); //接受线程

}

}

class MsgSend implements Runnable //发送

{

private DatagramSocket dsock;

public MsgSend(DatagramSocket dsock)

{

this.dsock= dsock;

}

public void run()

{

BufferedReader bufr = new BufferedReader(new InputStreamReader(System.in));

String lineStr = null;

try

{

while(true)

{

lineStr = bufr.readLine();

if(lineStr!=null)

{

if(lineStr.equals("over886"))

{

break;

}

else

{

byte[] dataBuf = lineStr.getBytes();

DatagramPacket dataPack = //数据打包

new DatagramPacket( dataBuf,

dataBuf.length,

InetAddress.getByName("192.168.1.255"), //广播

9999 //目标端口

);

dsock.send(dataPack);

}

}

}

bufr.close();

dsock.close();

}

catch(Exception e)

{

throw new RuntimeException("发送失败!");

}

}

}

class MsgRece implements Runnable //接收

{

private DatagramSocket dsock;

public MsgRece(DatagramSocket dsock)

{

this.dsock= dsock;

}

public void run()

{

try

{

while(true)

{

byte[] dataBuf = new byte[1024];

DatagramPacket dataPack = new DatagramPacket(dataBuf,dataBuf.length);

dsock.receive(dataPack); //将获取的数据保存到指定的数据包

String ip = dataPack.getAddress().getHostAddress();

String data = new String(dataPack.getData(),0,dataPack.getLength());

int port = dataPack.getPort();

System.out.println();

System.out.println("来自ip为 "+ip+" : "+port+" 的消息");

System.out.println(data);

}

}

catch(Exception e)

{

throw new RuntimeException("接受失败!");

}

finally

{

dsock.close();

}

}

}

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