如何用Java实现一个简单的HTTP服务器？-蒲公英云

如何用Java实现一个简单的HTTP服务器？

原创系统管理员 2024-09-23 10:27 312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; // Change this to the desired port
    public static void main(String[] args) {
        try (ServerSocket serverSocket = new ServerSocket(PORT)) {
            System.out.println("HTTP server started on port " + PORT);
            while (true) {
                Socket clientSocket = serverSocket.accept(); // Wait for a connection
                handleClientConnection(clientSocket);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    private static void handleClientConnection(Socket clientSocket) {
        try (OutputStream outputStream = new FileOutputStream("/temp/index.html")); // Assuming the server is serving an index.html file
             OutputStream clientOutputStream = clientSocket.getOutputStream();) {
            // Write the HTTP response headers
            String httpResponseHeaders = "HTTP/1.1 200 OK\r\n";
            byte[] headersBytes = httpResponseHeaders.getBytes();
            // Write the HTTP response body (index.html file)
            byte[] indexHtmlContentBytes = new byte[] {
                '<!DOCTYPE html>', // HTML5 declaration
                '<html lang="en">', // HTML tag with lang attribute
                '<head>', // Head tag
                '<meta charset="UTF-8">', // Character encoding meta tag
                '<title>Simple HTTP Server</title>', // Title meta tag
                '</head>', // End of head tag
                '<body>', // Body tag
                '<h1>Welcome to the Simple HTTP Server!</h1>', // Heading 1 tag
                '</body>', // End of body tag
                '</html>' // End of HTML document
            };
            // Write the full response (headers + body)
            byte[] fullResponseBytes = headersBytes.concat(indexHtmlContentBytes));
            // Send the full response to the client
            clientOutputStream.write(fullResponseBytes);
            clientOutputStream.flush();
        } catch (IOException e) {
            System.err.println("Error handling client connection: " + e.getMessage());
            e.printStackTrace();
        }
    }
}