MiniCat Implementation

This article explains how to implement a simplified version of Tomcat called MiniCat. The core components include:

  1. MiniCat Overview: A hand-written simplified Tomcat web server that accepts HTTP requests via Socket communication, encapsulates requests into Request objects, handles both static resources (HTML) and dynamic resources (Servlets), and returns responses to the browser.

  2. HttpProtocoUtil: A utility class that manually constructs HTTP response headers, including methods for returning HTTP 200 success responses and HTTP 404 not found responses.

  3. HttpServlet: An abstract base class implementing the Servlet interface with abstract methods doGet() and doPost(). The service() method routes requests to appropriate handlers based on HTTP method type.

  4. Request: A class that parses HTTP request information from the InputStream, extracting the method (GET/POST) and URL path from the first line of the request header.

  5. RequestProcessor: A Thread subclass that handles each client connection. It parses the request, determines whether to serve a static resource or invoke a corresponding Servlet based on URL mapping, and closes the socket after processing.

The article demonstrates how web servers handle HTTP requests and route them to appropriate handlers through a simplified implementation.