Message reminder tool implemented in Java

Message reminder tool implemented in Java

With the development of the Internet and the popularity of mobile devices, people's demand for real-time messages is getting higher and higher. In order to meet this demand, we can develop a message reminder tool implemented in Java. This article will introduce how to use Java to implement a simple message reminder tool and give code examples.

First, we need to define a message reminder class. This class should have the functionality to send and receive messages. We can achieve this functionality by using Java's Socket and ServerSocket classes. The following is a simple code example of the message reminder class:

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 MessageNotifier {
    private static final int PORT = 8888;

    public static void main(String[] args) {
        ServerSocket serverSocket = null;
        Socket clientSocket = null;

        try {
            // 创建服务器套接字并开始监听端口
            serverSocket = new ServerSocket(PORT);
            System.out.println("服务器已开启，等待连接...");

            // 接受客户端连接请求
            clientSocket = serverSocket.accept();
            System.out.println("客户端连接成功！");

            // 获取输入输出流
            BufferedReader in = new BufferedReader(
                    new InputStreamReader(clientSocket.getInputStream()));
            PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true);

            // 接收消息
            String message = in.readLine();
            System.out.println("收到消息：" + message);

            // 发送消息
            out.println("消息已收到！");

            // 关闭连接
            clientSocket.close();
            serverSocket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

In the above code, we first created a ServerSocket object and specified the listening port as 8888. Then wait for the client connection request by calling the accept method. Once the client connects successfully, we can obtain the input and output streams, receive messages sent by the client through the input stream, and send messages to the client through the output stream. Finally, we close the connection.

Next, we can use the message reminder class in another Java class to send and receive messages. The following is a simple usage example:

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

public class MessageClient {
    private static final String HOST = "localhost";
    private static final int PORT = 8888;

    public static void main(String[] args) {
        Socket socket = null;
        PrintWriter out = null;
        BufferedReader in = null;

        try {
            // 创建客户端套接字并连接服务器
            socket = new Socket(HOST, PORT);

            // 获取输入输出流
            out = new PrintWriter(socket.getOutputStream(), true);
            in = new BufferedReader(new InputStreamReader(socket.getInputStream()));

            // 发送消息
            out.println("Hello, Server!");

            // 接收消息
            String message = in.readLine();
            System.out.println("收到回复：" + message);

            // 关闭连接
            out.close();
            in.close();
            socket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

In this example, we set the client's host and port to localhost and 8888, that is, connect locally. Then we connect through the Socket object and obtain the input and output streams. We send a message to the server through the output stream and receive the server's reply through the input stream. Finally, we close the connection.

Through the above code example, we can implement a simple message reminder tool implemented in Java. Functions can be expanded according to actual needs, such as adding message queues, multi-threading support, etc. I hope this article can help you understand the implementation of Java message reminder tool.

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