教你用Java验证服务器登录系统

一、前言

代码全部由自己所写，作者是一名小白请多多包涵，如果代码有什么不好的地方大佬们可以指出问题

单独写一个这样简易的登录是因为比较方便，由于我尝试了多次在写好的程序内直接写这个登录系统测试，很麻烦、不方便，所以单独写出了这套代码，个人觉得这样把写好的程序放进去修改就比较方便多了

二、登录系统服务端

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();

        }

    }

}

三、登录系统客户端

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");
                }
            }

    }

}

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