Servlet生命周期

servlet的生命周期

我们一般都了解servlet的大致生命周期为：初始化，服务（get、post请求）、结束，如下图

该图说明了各个方法的前后调用顺序

以下为创建方式：

class Demo extends HttpServlet {

    //get请求访问
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        System.out.println(" invoke get method ");
    }

    //post请求访问
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        System.out.println(" invoke post method ");
    }

    /**
     * Servlet生命周期init、service、destroy
     */
    //初始化
    @Override
    public void init() throws ServletException {
        System.out.println(" invoke init method ");
        super.init();
    }
    
    //服务
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        System.out.println(" invoke service method ");
        super.service(req, resp);
    }
    
    //销毁
    @Override
    public void destroy() {
        System.out.println(" invoke destroy method ");
        super.destroy();
    }
}