请分析并实现一个简单的Java服务，包括服务启动、监听请求、返回响应等步骤。

原创ゞ浴缸里的玫瑰 2025-03-11 20:54 9阅读 0赞

首先，我们需要创建一个Java类来实现这个服务。我们将这个类命名为`SimpleService`。

以下是一个简单的实现：

```java
import java.io.BufferedReader;
import java.io.InputStreamReader;

public class SimpleService {
    private static final int PORT = 8080; // Change this to your desired port

public static void main(String[] args) {
        // Start server
        startServer();

// Listen for requests
        listenForRequests();
    }

// Start server method
    private static void startServer() {
        try {
            System.out.println("Server is starting...");
            // Create a server socket to listen on the port
            ServerSocket serverSocket = new ServerSocket(PORT);
            System.out.println("Server is up and running on port " + PORT);

// Listen for requests in separate thread
            Thread listeningThread = new Thread(new RequestListener(serverSocket)));
            listeningThread.start();
        } catch (Exception e) {
            System.err.println("Error starting server: " + e.getMessage());
            e.printStackTrace();
        }
    }

// Listen for requests method
    private static void listenForRequests() {
        try {
            BufferedReader in = new BufferedReader(new InputStreamReader(System.in)));
            while (true) {
                System.out.print("Enter a request or 'quit' to exit: ");
                String request = in.readLine();

if ("quit".equalsIgnoreCase(request)) {
                    break;
                } else { // Handle requests here
                    System.out.println("Received request: " + request);
                    // Add your logic for handling the request
                }
            }
        } catch (Exception e) {
            System.err.println("Error listening for requests: " + e.getMessage());
            e.printStackTrace();
        }
    }

// RequestListener class to handle incoming requests
    private static class RequestListener implements Runnable {
        private ServerSocket serverSocket;

public RequestListener(ServerSocket serverSocket) {
            this.serverSocket = serverSocket;
        }

@Override
        public void run() {
            try {
                System.out.println("Request listener is running...");
                // Wait for incoming requests
                Socket clientSocket = serverSocket.accept();
                System.out.println("Received request from client: " + clientSocket);

// Handle the request and send a response
                String response = "Hello, this is your response!";
                BufferedReader inFromClient = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()))); 
                BufferedWriter outToClient = new BufferedWriter(new OutputStreamWriter(clientSocket.getOutputStream())));

System.out.println("Writing response to client...");
                outToClient.write(response);
                outToClient.flush();

System.out.println("Closing client socket...");
                clientSocket.close();

} catch (Exception e) {
                System.err.println("Error handling request: " + e.getMessage());
                e.printStackTrace();
            }
        }
    }
}
```

这个服务首先启动服务器监听指定的端口。当有请求到达时，它会处理这个请求（在这个例子中，只是打印出收到的请求），然后返回一个响应。

要运行这个服务，只需在命令行中输入`java SimpleService`。