mailclient.java

这是一个用java编写的关于WEB应用编程的简单的聊天系统的样例

package inter;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.util.Arrays;
import java.util.Random;

public class MailClient {

	public static void main(String[] args) throws IOException {
		InetAddress remoteAddress = InetAddress.getByName("127.0.0.1");// 发送人的地址
		DatagramPacket packet = null;// 准备写信
		DatagramSocket socket = new DatagramSocket();
		byte[] buf=null;
		for (int i = 0; i < 20; i++) {
			int stucode = Integer.parseInt("050701") + i;
			int stuscore = Integer.parseInt("68") + i;
			String info = new String(stucode + ".java." + stuscore);// 写信内容
			Random rand = new Random();
			String[] say = { info, "bye" };
			String s = say[rand.nextInt(2)];
//			if(buf!=null){
//			Arrays.fill(buf,"\0".getBytes()[0]);
//			}
		buf = s.getBytes();// 将内容转化为字节
			System.out.println(new String(buf));
			packet = new DatagramPacket(buf, buf.length, remoteAddress, 5678);// 打包
			socket.send(packet);
			if (s.compareTo("bye") == 0) {
				socket.close();// 发送
				break;
			}
		}
	}
}