需求1：用户注册功能，具体要求如下：
1）提示用户通过键盘输入信息：用户名，密码，email地址
2）将用户信息传送到服务器
3）服务器接受用户信息并写入到users.txt文件中
4）返回注册成功信息
------解决方案--------------------
client:
- Java code
package com.cn.socket;import java.io.DataOutputStream;import java.io.IOException;import java.net.Socket;import java.net.UnknownHostException;import java.util.Scanner;public class TCPClient { public static void main(String[] args) throws UnknownHostException, IOException { String name; String password; String email; Scanner sc = new Scanner(System.in); System.out.println("输入name:"); name = sc.nextLine(); System.out.println("输入password"); password = sc.nextLine(); System.out.println("输入email"); email = sc.nextLine(); Socket s = new Socket("127.0.0.1", 4444); DataOutputStream dos = new DataOutputStream(s.getOutputStream()); dos.writeUTF(name + "&" + password + "&" + email); s.close(); }}