设计并实现一个简单的Java网络服务器

原创心已赠人 2025-03-17 00:42 45阅读 0赞

设计一个简单的Java网络服务器，我们可以创建一个HTTP服务器，使用Servlet来处理客户端请求。

以下是一个基本的服务器设计：

1. **Server类**：作为主服务器类，启动服务器监听特定端口。

```java
import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;

public class SimpleHttpServer {
    private int port;

public SimpleHttpServer(int port) {
        this.port = port;
    }

public void start() throws IOException {
        ServerSocket serverSocket = new ServerSocket(port);

System.out.println("HTTP server listening on port " + port);

while (true) {
            Socket clientSocket = serverSocket.accept();
            handleClient(clientSocket);
        }
    }

private void handleClient(Socket clientSocket) throws IOException {
        BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()))));
        PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true));

String requestLine = in.readLine(); // read first line
        if (requestLine != null && !requestLine.isEmpty()) {
            String[] tokens = requestLine.split(" "); // split into tokens

if (tokens[0].equals("GET")) { // handle GET request
                String resourcePath = "/index.html"; // example resource path

if (resourcePath.equals(tokens[1])) || resourcePath.startsWith(tokens[1])) {
                    out.println("HTTP/1.1 200 OK");
                    out.println("Content-Type: text/html");
                    out.println();
                    out.println("<!DOCTYPE html>");
                    out.println("<html lang='en'>");
                    out.println("<head>");
                    out.println("<meta charset='UTF-8'>"); // UTF-8 encoding
                    out.println("<title>HTTP Server</title>");
                    out.println("</head>");
                    out.println("<body>");
                    out.println("<h1>Hello, World!</h1>"); // example content
                    out.println("</body>");
                    out.println("</html>"); // end document tag

// send headers
                    out.flush();

// read and discard response body (if any)
                    BufferedReader inBody = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()))));
                    String line;
                    while ((line = inBody.readLine()) != null)) {
                        // do nothing, response body is discarded here
                    }
                    inBody.close();
                } else { // handle other request types or not handled cases
                    out.println("HTTP/1.1 405 Method Not Allowed");
                    out.flush();

// read and discard response body (if any)
                    BufferedReader inBody = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()))));
                    String line;
                    while ((line = inBody.readLine()) != null)) {
                        // do nothing, response body is discarded here
                    }
                    inBody.close();
                }
            } else { // handle other cases or not handled request types
                out.println("HTTP/1.1 405 Method Not Allowed");
                out.flush();

// read and discard response body (if any)
                BufferedReader inBody = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()))));
                String line;
                while ((line = inBody.readLine()) != null)) {
                    // do nothing, response body is discarded here
                }
                inBody.close();
            }
        } else { // handle other cases or not handled request types
            out.println("HTTP/1.1 405 Method Not Allowed");
            out.flush();

public static void main(String[] args) throws IOException {
        SimpleHttpServer server = new SimpleHttpServer(8080); // set port number for server to listen on

server.start(); // start server thread

System.out.println("HTTP server started on port " + 8080);

// wait until server is stopped gracefully
        server.stop();
    }
}
```

这个服务器会监听8080端口，当有客户端请求时，它会根据请求的方法（GET或POST）处理响应。