教你用Java验证服务器登录系统

import java.io.*;

import java.net.ServerSocket;

import java.net.Socket;

public class ServerLogin {

     public static void main(String[]args) throws IOException{

         Server();

     }

     public static void Server() throws IOException{

         String name = "AccountPassword.txt" ;

         String path = System.getProperty( "user.dir" )+ "\\" +name;

         File file = new File(path);

         if (!file.exists()){

             BufferedWriter bw = new BufferedWriter( new FileWriter(file.getAbsoluteFile()));

             file.createNewFile();

             bw.write( "1391634154--123456" );

             bw.newLine();

             bw.write( "654321--123" );

             bw.flush();

             bw.close();

             System.out.println( "Server生成账号数据" );

         }

         ServerSocket server = new ServerSocket( 8848 );

         System.out.println( "端口开启成功" );

         Object obj = new Object();

         while ( true ){

             Socket accept = server.accept();

             new Thread( new Runnable() {

                 @Override

                 public void run() {

                     int A = 0 ;

                     boolean ServerStart = false ;

                     boolean WhileThread = true ;

                     int len = 0 ;

                     try {

                         InputStream inputStream = accept.getInputStream();

                         OutputStream outputStream = accept.getOutputStream();

                         while (WhileThread){

                             if (ServerStart== false ){

                                 System.out.println( "Server=false已经执行" );

                                 BufferedReader br = new BufferedReader( new FileReader(file.getAbsoluteFile()));

                                 byte [] bytes = new byte [ 1024 ];

                                 len = inputStream.read(bytes);

                                 String User = new String(bytes, 0 ,len);

                                 len = 0 ;

                                 String Line;

                                 while ((Line = br.readLine())!= null ){

                                     if (Line.equals(User)){

                                         System.out.println( "正确" +Thread.currentThread().getName()+ "-->User:" +User);

                                         outputStream.write( "true" .getBytes());

                                         ServerStart = true ;

                                         break ;

                                     }

                                     if (!Line.equals(User)){

                                         A++;

                                         System.out.println( "失败" +Thread.currentThread().getName()+ "-->User:" +User);

                                         outputStream.write( "false" .getBytes());

                                         break ;

                                     }

                                 }

                             }

                             if (A== 3 ){

                                 // 结束循环 断开连接

                                 WhileThread = false ;

                                 inputStream.close();

                                 outputStream.close();

                                 accept.close();

                             }

                         }

                     } catch (IOException e){

                     }

                 }

             }).start();

         }

     }

}

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.net.Socket;

import java.util.Scanner;

public class ClienteLogin {

     static Scanner sc = new Scanner(System.in);

     static String Server = "false" ;

     public static void main(String[]args) throws IOException{

         Cliente();

     }

     public static void Cliente() throws IOException{

         int ClienteOff = 0 ;

         System.out.println( "ClienteOn" );

         System.out.print( "IP:" );

         String next = sc.next();

         System.out.print( "Port:" );

         int Port = sc.nextInt();

         Socket socket = new Socket(next,Port);

         InputStream inputStream = socket.getInputStream();

         OutputStream outputStream = socket.getOutputStream();

         byte [] bytes = new byte [ 1024 ];

         while ( true ){

             if (ClienteOff == 3 ){

                 break ;

             }

             ClienteOff++;

             if (Server.equals( "false" )){

                 System.out.print( "账号:" );

                 String User = sc.next();

                 System.out.print( "密码:" );

                 String Password = sc.next();

                 String AccountPassword = User+ "--" +Password;

                 outputStream.write(AccountPassword.getBytes());

                 int len = inputStream.read(bytes);

                 Server = new String(bytes, 0 ,len);

                 len = 0 ;

                 if (Server.equals( "false" )){

                     System.out.println( "登录失败，账号或密码错误" );

                 } else if (Server.equals( "true" )){

                     System.out.println( "登录成功" );

                 }

             }

     }

}