注册验证程序客户端

package com.ceshi;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.util.regex.Pattern;

/**
* 客户端
*
*
* */
public class Kehuduan implements Runnable {
/**
* 登录验证
*
* @throws Exception
*
* */
DatagramSocket s;

public Kehuduan(DatagramSocket s) {    super();    this.s = s;}@Overridepublic void run() {        while(true){    try {        byte[] b5 = new byte[1024];        DatagramPacket dag = new DatagramPacket(b5, b5.length);        s.receive(dag);        System.out.println("验证码是"+new String(b5).trim());        System.out.println("请输入你的验证");        // 把输入的字放入缓冲流        BufferedReader bbi2 = new BufferedReader(new InputStreamReader(                System.in));        String br = bbi2.readLine();        DatagramPacket dp3 = new DatagramPacket(br.getBytes(), br.length(),                InetAddress.getLocalHost(), 9999);        // 写入数据包        s.send(dp3);        break;    } catch (Exception e) {    }}}public static void main(String[] args) throws Exception {    // 数字的格式只能是数字    Pattern pc = Pattern.compile("[0-9]{8}");    // 密码的格式    Pattern ppc = Pattern.compile("[0-9a-zA-Z]{15}");    // 获取端口    DatagramSocket s = new DatagramSocket(8888);    Kehuduan z = new Kehuduan(s);    while (true) {    System.out.println("请输入你的用户名");        // 把输入的字放入缓冲流        BufferedReader bbi = new BufferedReader(new InputStreamReader(                System.in));        // 读取每一行        String sb = bbi.readLine();        // 判断输入的格式是否满足        if (pc.matcher(sb).matches()) {            System.out.println("输入成功");        } else {            System.out.println("只能输入数字八位");            break;        }        System.out.println("请输入密码");        // 把输入的字放入缓冲流        BufferedReader bbi1 = new BufferedReader(new InputStreamReader(                System.in));        // 读取每一行        String sb1 = bbi1.readLine();        if (ppc.matcher(sb1).matches()) {            System.out.println("密码设置成功");        } else {            System.out.println("必须是数字字母满足15位");            break;        }        // 转换成byte获取本机ip        DatagramPacket dp = new DatagramPacket(sb.getBytes(), sb.length(),                InetAddress.getLocalHost(), 9999);        // 写入数据包        s.send(dp);        // 转换成byte获取本机ip        DatagramPacket dp1 = new DatagramPacket(sb1.getBytes(),                sb1.length(), InetAddress.getLocalHost(), 9999);        // 写入数据包        s.send(dp1);        break;    }    new Thread(z).start();}

}