java网络编程实现登陆

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/ITzhongzi/article/details/84637713

功能描述： 客户端 输入用户名密码，并发送给服务器，服务器端接受信息并进行验证字后，返回客户端成功或者失败。

客户端代码

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

public class ClientDemo {
    public static void main(String[] args) throws IOException {
        String ddd = "lhw";
        System.out.println( ddd == "lhw");
//        Socket s = new Socket(InetAddress.getByName("DESKTOP-U9154BD"), 10077);
        Socket s = new Socket("DESKTOP-U9154BD", 10077);
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        System.out.println("请输入用户名");
        String name = br.readLine();
        System.out.println("请输入密码");
        String pwd = br.readLine();

//        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));
        PrintWriter out = new PrintWriter(s.getOutputStream(), true);
        out.println(name);
        out.println(pwd);

        BufferedReader br2 = new BufferedReader(new InputStreamReader(s.getInputStream()));
        String result  = br2.readLine();
        System.out.println(result);
        s.close();
    }
}

服务器端代码

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

public class ServerDemo {
    public static void main(String[] args) throws IOException {
        ServerSocket ss = new ServerSocket(10077);
        Socket s = ss.accept();
        BufferedReader br = new BufferedReader(new InputStreamReader(s.getInputStream()));
        String name = br.readLine();
        String pwd = br.readLine();
        boolean flag = false;
        System.out.println(name);
        System.out.println(pwd);
        System.out.println(name == "lhw");
        if(name.equals("lhw") && pwd.equals("123")){
            flag = true;
        }
        PrintWriter  pw = new PrintWriter(s.getOutputStream(), true);
        if(flag) {
            pw.println("success");
        }else {
            pw.println("error");
        }

//        s.close();
//        ss.close();
    }
}