使用TCP模拟登陆

import java.util.ArrayList;
import java.util.List;

public class UserDB {
   //使用Map存储账号密码
   private static List<User>users=new ArrayList<User>();
   //模拟数据库
   static{
//自定义用户密码
      users.add(new User("利亚东","123456"));
      users.add(new User("超超","654321"));
      users.add(new User("彪","123321"));
      users.add(new User("？？？","toString"));
   }
   public static List<User> getUsers(){
      return users;
   }

ublic class User {
   private String username;
   private String password;
   public User() {
      super();
      // TODO Auto-generated constructor stub
   }
   public User(String username, String password) {
      super();
      this.username = username;
      this.password = password;
   }
   public String getUsername() {
      return username;
   }
   public void setUsername(String username) {
      this.username = username;
   }
   public String getPassword() {
      return password;
   }
   public void setPassword(String password) {
      this.password = password;
   }
   @Override
   public boolean equals(Object obj) {
      if (this == obj)
         return true;
      if (obj == null)
         return false;
      if (getClass() != obj.getClass())
         return false;
      User other = (User) obj;
      if (password == null) {
         if (other.password != null)
            return false;
      } else if (!password.equals(other.password))
         return false;
      if (username == null) {
         if (other.username != null)
            return false;
      } else if (!username.equals(other.username))
         return false;
      return true;
   }

}

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.List;

import org.apache.log4j.Logger;
public class ServerTest {

   public static void main(String[] args) throws IOException {
      //创建服务器
      ServerSocket ss=new ServerSocket(1234);
      //监听
      Socket s=ss.accept();
      //获取输入流对象
      BufferedReader br=new BufferedReader(new InputStreamReader(s.getInputStream()));
      //获取用户名密码
      String username=br.readLine();
      String password=br.readLine();
      boolean flag=false;

      List<User> users=UserDB.getUsers();
      User user=new User(username,password);
      if(users.contains(user)){
         //匹配成功
         flag=true;
      }
      //获取输出流对象
      PrintWriter out=new PrintWriter(s.getOutputStream(),true);
      if(flag){
         out.println("登录成功");
      }else{
         out.println("登录失败");
      }
      s.close();
   }

}

import org.apache.log4j.Logger;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;

//模拟用户登录
public class ClientTest {
   public static Logger logger=Logger.getLogger(Liyado.class.getClass());
   public static void main(String[] args) throws IOException {
      //通过计算机名获取
      Socket s=new Socket("SKY-20171211NJY",1234);
      //获取用户名密码
      BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
      System.out.println("请输入用户名：");
      String username=br.readLine();
      System.out.println("请输入秘密：");
      String password=br.readLine();
      //获取输出流对象
      PrintWriter out=new PrintWriter(s.getOutputStream(),true);
      //写出数据
      out.println(username);
      out.println(password);
      //获取输入流对象
      BufferedReader serverBr=new BufferedReader(new InputStreamReader(s.getInputStream()));
      //获取服务器返回的数据
      String result=serverBr.readLine();
      System.out.println(result);
      //释放资源
      s.close();
   }

   private static class Liyado {
   }
}

执行结果