Java网络编程入门——基于TCP协议的简单C/S控制台登陆

深碍√TFBOYSˉ_ 2023-07-16 10:57 10阅读 0赞

# 前言 #

TCP和UDP的区别是开发的时候经常会遇到的问题，TCP是面向连接的协议，可靠，但是效率比UDP低，开销也大，适合文件传输、远程登录，HTTP协议也是基于TCP协议的，一切为了完整性和可靠性。UDP适合即时聊天，没有保证，但是即使出现了错误，重新传输的代价也不高。

在登陆系统中，是否登陆成功，是需要返回一个反馈的，所以采用TCP比较合适。

# 效果 #

*这里设定了账号为oushile，密码为123，否则登陆失败*

客户端：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQzNTc2MDI4_size_16_color_FFFFFF_t_70]  
服务端：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQzNTc2MDI4_size_16_color_FFFFFF_t_70 1]

# 代码 #

Server.java:

package TCP;
    
    import java.io.DataInputStream;
    import java.io.DataOutputStream;
    import java.io.IOException;
    import java.net.ServerSocket;
    import java.net.Socket;
    
    public class Server {
        
        public static void main(String[] args) throws IOException {
        
            ServerSocket server=new ServerSocket(8888);
            Socket socket = server.accept();
            System.out.println("Connected!");
            DataInputStream dataInputStream = new DataInputStream(socket.getInputStream());
            String data=dataInputStream.readUTF();
            String[] split = data.split("&");
            for (String array:split){
        
                System.out.println(array);
            }
            DataOutputStream dataOutputStream = new DataOutputStream(socket.getOutputStream());
    
            if(split[0].equals("oushile")&&split[1].equals("123")){
        
                dataOutputStream.writeUTF("Successfully!");
                dataOutputStream.flush();
            }else{
        
                dataOutputStream.writeUTF("Failed,please check your messages");
                dataOutputStream.flush();
            }
    
            dataInputStream.close();
            server.close();
    
        }
    }

Client.java

package TCP;
    
    import java.io.*;
    import java.net.Socket;
    
    public class Client {
        
        public static void main(String[] args) throws IOException {
        
            Socket client=new Socket("localhost",8888);
            DataOutputStream dataOutputStream = new DataOutputStream(client.getOutputStream());
            System.out.println("请输入用户名");
            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
            String username=bufferedReader.readLine();
            System.out.println("Please input password");
            bufferedReader = new BufferedReader(new InputStreamReader(System.in));
            String password = bufferedReader.readLine();
    
            dataOutputStream.writeUTF(username+"&"+password);
            dataOutputStream.flush();
    
            DataInputStream dataInputStream = new DataInputStream(client.getInputStream());
            System.out.println(dataInputStream.readUTF());
    
            dataOutputStream.close();
            client.close();
    
    
        }
    }

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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQzNTc2MDI4_size_16_color_FFFFFF_t_70 1]: /images/20230528/02178a4b9cfb49ab8e196c821cb5962d.png