用Java语言编写简单聊天程序

<span style="font-size:18px;"></span><pre name="code" class="java"><span style="font-size:18px;">Tips：编写一个聊天程序。传输层使用UDP协议。可以同时接收、发送数据 需要多线程技术一个线程控制接收，一个线程发送 因为收和发动作不一致，定义两个run方法这两个方法封装在不同的类中	 </span>

<span style="font-size:18px;">import java.io.*;
import java.net.*;
/*
* 创建局域网聊天
*/
public class UDPChat{
public static void main(String[] arr) throws Exception{
DatagramSocket sendsocket = new DatagramSocket();
DatagramSocket recesocket = new DatagramSocket(10239);

new Thread(new UDPSendChat(sendsocket)).start();
new Thread(new UDPReceChat(recesocket)).start();
}
}

class UDPSendChat implements Runnable {

private DatagramSocket ds;
public UDPSendChat(DatagramSocket ds) {
this.ds = ds;
}
@Override
public void run() {
try {
BufferedReader br = new
BufferedReader(new InputStreamReader(System.in));

String line = null;

while((line = br.readLine())!=null){//read阻塞式方法

if("886".equals(line))
break;

byte[] buf = line.getBytes();

DatagramPacket dp = new
DatagramPacket(buf, buf.length, InetAddress.getLocalHost(), 10239);

ds.send(dp);
}
} catch (Exception e) {
throw new RuntimeException("发送失败");
}

}

}

class UDPReceChat implements Runnable {

private DatagramSocket ds;
public UDPReceChat(DatagramSocket ds) {
this.ds = ds;
}

@Override
public void run() {
try {
while(true){

byte[] buf = new byte[1024];
DatagramPacket dp = new DatagramPacket(buf, buf.length);

ds.receive(dp);//阻塞式方法

String ip = dp.getAddress().getHostAddress();
String data = new String(dp.getData(),0,dp.getLength());
System.out.println(ip+"..."+data);
}
} catch (Exception e) {
throw new RuntimeException("接受失败");
}

}

}
</span>

<span style="font-size:18px;">不同的IP地址上聊天截图：</span>

<span style="font-size:18px;"><img src="http://img.blog.csdn.net/20160618105059608?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />
</span>

<span style="font-size:18px;"><img src="http://img.blog.csdn.net/20160618105104139?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />
</span>

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