解决HTTP method POST is not supported by this URL的问题

在学习SpringBoot整合Servlet三大组件的过程中。我首先自定义了一个Servlet继承自HttpServlet，代码如下：@Componentpublic class MyServlet extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp)

pink-fei

4278人浏览 · 2021-11-19 19:18:59

pink-fei · 2021-11-19 19:18:59 发布

在学习SpringBoot整合Servlet三大组件的过程中。我首先自定义了一个Servlet继承自HttpServlet，代码如下：

@Component
public class MyServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        super.doPost(req, resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.getWriter().write("hello myServlet");
    }
}

然后创建了一个Servlet组件配置类：

@Configuration
public class ServletConfig {

    @Bean
    public ServletRegistrationBean getServlet(MyServlet myServlet){
         return new ServletRegistrationBean(myServlet,"/myServlet");
    }

}

接着启动项目，然后在浏览器中输入：http://localhost:8080/myServlet

发现出现如下错误:

Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.

Fri Nov 19 18:58:33 CST 2021
There was an unexpected error (type=Method Not Allowed, status=405).
HTTP method POST is not supported by this URL

重点在最后一句post方法不被支持。

查看源代码发现super没用改为this让它调用第二个方法，所以出现了错误。

@Component
public class MyServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        this.doPost(req, resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.getWriter().write("hello myServlet");
    }
}