使用Java实现简单HTTP服务器实例-蒲公英云

使用Java实现简单HTTP服务器实例

原创矫情吗；* 2024-12-02 04:54 29阅读 0赞

在Java中，我们可以使用内置的ServerSocket和Socket类来创建一个简单的HTTP服务器。以下是一个基本的例子：

import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
public class SimpleHTTPServer {
    private static final int PORT = 8000; // Set your port here
    public static void main(String[] args) {
        try (ServerSocket serverSocket = new ServerSocket(PORT)) {
            System.out.println("HTTP Server is listening on port " + PORT);
            while (true) { // Loop to accept and handle incoming requests
                Socket clientSocket = serverSocket.accept(); // Accept the connection
                System.out.println("Client connected: " + clientSocket.getRemoteSocketAddress()));
                BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()))); // Get input stream from client socket
                PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true)); // Get output stream from client socket and set buffer size to 1KB (for faster response)
                String requestLine = in.readLine(); // Read first line of the request
                if (requestLine == null || requestLine.trim().isEmpty()) {
                    System.out.println("Invalid request line");
                    out.close();
                    in.close();
                    clientSocket.close();
                    continue;
                }
                String method = requestLine.substring(0, requestLine.indexOf(' '))).trim(); // Extract method from request line
                String url = requestLine.substring(requestLine.indexOf(' ') + 1)).trim(); // Extract URL from request line
                System.out.println("Received method: " + method);
                System.out.println("Received URL: " + url);
                if (method.equalsIgnoreCase("GET")) { // Handle GET requests
                    out.print("HTTP/1.1 200 OK\r\n");
                    out.print("<html><head><title>Example GET Response</title></head><body><h1>Here is the content for your GET request:</h1>" + "<p>" + "This is a sample text generated specifically for this HTTP server instance.</p>" + "</body></html>\r\n"); // Generate HTML response
                    out.flush();
                } else if (method.equalsIgnoreCase("POST")) { // Handle POST requests (for simplicity, just print the received data)
                    out.print("<h1>Received POST Data:</h1>\n");
                    out.print("<pre>" + url + "</pre>\n");
                    out.print("<p>This is the raw content of your POST request:</p>\n");
                    out.flush();
                } else { // Handle other methods (not implemented in this example)
                    out.print("HTTP/1.1 405 Method Not Allowed\r\n");
                    out.flush();
                }
            }
        } catch (IOException e) {
            System.out.println("Error occurred while processing the request: " + e.getMessage());
            e.printStackTrace();
        } finally {
            try {
                in.close();
                out.close();
                clientSocket.close();
            } catch (IOException e) {
                System.out.println("Error occurred while closing resources: " + e.getMessage());
                e.printStackTrace();
            }
        }
    }
}