Deep analysis of the working principle of the SimpleHttpServer framework
SimpleHttpServer is a lightweight HTTP server framework based on Java that provides a simple and easy-to-use way to develop and deploy HTTP server applications. This article will delve into the working principle of the SimpleHttpServer framework and provide Java code examples.
1、 How SimpleHttpServer Works
The working principle of the SimpleHttpServer framework can be simply divided into the following steps:
1. Create a server object: By instantiating the SimpleHttpServer class, you can create an HTTP server object.
2. Listen on Port: Call the listen method of the server object to specify the port number that the server should listen on. The server will start listening for HTTP requests on the specified port.
3. Process Request: When a client sends an HTTP request to a specified port, the server will receive the request and process it. The server processes each request by creating an independent thread to allow for concurrent processing of multiple requests.
4. Parse Request: The server will parse the request line, request header, and request body information in the HTTP request. The simple parsing process includes extracting the method, URI, and protocol version from the request message, as well as parsing the various fields of the request header.
5. Routing request: Based on the request URI and request method, the server will determine the specific processing program to execute based on predefined routing rules. These routing rules can be defined through programming or annotations (such as @ Path annotations).
6. Execute handler: The server will call the handler corresponding to the request to process the request. The handler can be a regular Java method that matches the request method through annotations such as @ GET, @ POST, etc.
7. Processing Response: The handler will generate HTTP response data, including response status code, response header, and response body information. The server will create an HTTP response based on the response data returned by the handler and send it to the client.
8. Close Connection: After processing the response, the server will close the connection with the client and release relevant resources. If the client remains connected, the server will continue to listen and process subsequent requests.
2、 Java code example for SimpleHttpServer
The following is a simple Java code example that demonstrates how to use the SimpleHttpServer framework to create an HTTP server and process GET requests:
import com.github.xiaoymin.knife4j.spring.annotations.EnableKnife4j;
import org.simpleframework.http.Request;
import org.simpleframework.http.Response;
import org.simpleframework.http.core.Container;
import org.simpleframework.http.core.ContainerServer;
import org.simpleframework.transport.connect.Connection;
import org.simpleframework.transport.connect.SocketConnection;
import java.io.IOException;
import java.io.PrintStream;
import java.net.InetSocketAddress;
public class SimpleHttpServerExample {
public static void main(String[] args) throws IOException {
Container container = new Container() {
public void handle(Request request, Response response) {
try {
//Process GET requests
if (request.getMethod().equalsIgnoreCase("GET")) {
handleGetRequest(request, response);
}
} catch (Exception e) {
e.printStackTrace();
response.setCode(500);
} finally {
response.close();
}
}
private void handleGetRequest(Request request, Response response) throws IOException {
PrintStream body = response.getPrintStream();
long time = System.currentTimeMillis();
response.setValue("Content-Type", "text/plain");
response.setValue("Server", "SimpleHTTPServer");
response.setDate("Date", time);
response.setDate("Last-Modified", time);
body.println("Hello, World!");
body.close();
}
};
//Create HTTP Server Object
Connection connection = new SocketConnection(new ContainerServer(container));
InetSocketAddress address = new InetSocketAddress(8080);
connection.connect(address);
}
}
The above example code creates a simple HTTP server and returns "Hello, World!" as a response when receiving a GET request. By calling the 'handle' method of the container, we can perform different processing based on the request method. In the example, we only processed GET requests.
Note that the example uses the relevant classes of the SimpleHttpServer framework, including 'Request', 'Response', 'Container', and 'ContainerServer'.
3、 Summary
SimpleHttpServer is a simple and easy-to-use HTTP server framework that can help developers quickly build Java based HTTP server applications. This article analyzes the working principle of the SimpleHttpServer framework and provides a simple Java code example to demonstrate how to use the framework. I hope readers can have a deeper understanding of the SimpleHttpServer framework through this article.
