# 利刃出鞘_Tomcat 核心原理解析

// 假设我们有一个简单的Servlet处理类
public class SimpleServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        // 设置响应内容类型
        resp.setContentType("text/html");
        // 获取输出流
        PrintWriter out = resp.getWriter();
        // 发送响应数据
        out.println("<h1>Hello, World!</h1>");
    }
}
 
// 假设我们有一个Tomcat容器的基本实现
public class SimpleTomcat {
 
    private HttpServer server;
 
    public SimpleTomcat(int port) throws IOException {
        // 初始化服务器
        server = HttpServer.create(new InetSocketAddress(port), 10);
        // 设置处理器
        server.setHandler(new SimpleHttpHandler());
        // 启动服务器
        server.start();
    }
 
    // 处理器类
    private static class SimpleHttpHandler implements HttpHandler {
        @Override
        public void handle(HttpExchange exchange) throws IOException {
            // 获取请求方法
            String method = exchange.getRequestMethod();
            // 根据请求方法决定如何处理
            if ("GET".equalsIgnoreCase(method)) {
                handleGetRequest(exchange);
            } else {
                // 其他方法返回405 Method Not Allowed
                exchange.sendResponseHeaders(405, -1);
            }
        }
 
        private void handleGetRequest(HttpExchange exchange) throws IOException {
            // 创建一个简单的Servlet处理请求
            SimpleServlet servlet = new SimpleServlet();
            // 创建请求和响应对象
            HttpServletRequest request = new SimpleServletRequest(exchange);
            HttpServletResponse response = new SimpleServletResponse(exchange);
            try {
                // 调用Servlet的service方法
                servlet.service(request, response);
            } catch (ServletException | IOException e) {
                e.printStackTrace();
            }
        }
    }
 
    // 简单的Servlet请求和响应封装
    private static class SimpleServletRequest extends HttpServletRequestWrapper {
        // 实现相关方法...
    }
 
    private static class SimpleServletResponse extends HttpServletResponseWrapper {
        // 实现相关方法...
    }
 
    public static void main(String[] args) throws IOException {
        int port = 8080;
        if (args.length > 0) {
            port = Integer.parseInt(args[0]);
        }
        new SimpleTomcat(port);
        System.out.println("Server is running on port " + port);
    }
}

这个代码示