Java基于socket实现简易聊天室实例

package com.socket.demo;
import java.io.IOException;
import java.net.DatagramSocket;
public class ChatRoomDemo {
/**
* @param args
* @throws IOException
*/
public static void main(String[] args) throws IOException {
System.out.println("----进入聊天室----");
DatagramSocket send = new DatagramSocket();
DatagramSocket rece = new DatagramSocket(10001);
new Thread(new SendDemo(send)).start();// 启动发送端线程
new Thread(new ReceiveDemo(rece)).start();// 启动接收端线程
}
}

package com.socket.demo;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
public class SendDemo implements Runnable {
private DatagramSocket ds;
// 有参数构造函数
public SendDemo(DatagramSocket ds) {
this.ds = ds;
}
@Override
public void run() {
try {
BufferedReader bufr = new BufferedReader(new InputStreamReader(
System.in));
String line = null;
while ((line = bufr.readLine()) != null) {
byte[] buf = line.getBytes();
/*
* //192.168.1.255是ip段广播地址，发给这个IP的信息，
* 在192.168.1.1-192.168.1.255的ip段的所有IP地址都能收到消息
*/
DatagramPacket dp = new DatagramPacket(buf, buf.length,InetAddress.getByName("192.168.1.255"), 10001);
ds.send(dp);
if ("886".equals(line))
break;
}
ds.close();
} catch (Exception e) {
}
}
}

package com.socket.demo;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
public class ReceiveDemo implements Runnable {
private DatagramSocket ds;
public ReceiveDemo(DatagramSocket ds) {
this.ds = ds;
}
@Override
public void run() {
try {
while (true) {
// 2,创建数据包。
byte[] buf = new byte[1024];
DatagramPacket dp = new DatagramPacket(buf, buf.length);
// 3,使用接收方法将数据存储到数据包中。
ds.receive(dp);// 阻塞式的。
// 4，通过数据包对象的方法，解析其中的数据,比如，地址，端口，数据内容。
String ip = dp.getAddress().getHostAddress();
int port = dp.getPort();
System.out.println("----port-----" + port);
String text = new String(dp.getData(), 0, dp.getLength());
System.out.println(ip + "::" + text);
if (text.equals("886")) {
System.out.println(ip + "....退出聊天室");
}
}
} catch (Exception e) {
}
}
}