java - 更改 servlet 映射会引发 "HTTP Status 405 - Request method ' GET' 不支持”

Question

我有一个问题:最初我有这个 servlet 映射:

<servlet-mapping>
    <servlet-name>mvc-dispatcher</servlet-name>
    <url-pattern>*.html</url-pattern>
</servlet-mapping>

Controller 映射到 example.html、example2.html url 时一切都很好。但在某些情况下，我想使用 *.json 映射，对于这种情况，我通过这种方式更改了 servlet 映射:

<servlet-mapping>
    <servlet-name>mvc-dispatcher</servlet-name>
    <url-pattern>/*</url-pattern>
</servlet-mapping>

经过这次更改，我得到了

HTTP Status 405 - Request method 'GET' not supported

我的 Controller 抛出错误的示例:

       @RequestMapping(value="example.html",method = RequestMethod.GET)
      public String example(
          @RequestParam(value = "q", defaultValue = "") String query,
          @RequestParam(value = "page", required = false, defaultValue = "1") int page,
          HttpServletRequest request, Model model)  {

        String template = "printout-blog";
    model.addAttribute("q", query);
    return template;
}

Answer 1

您将url-pattern定义为/*，这意味着调度程序将处理所有传入请求。将您的请求映射更改为下一行中的代码片段!(网址应以斜杠 / 开头)，一切都会正常工作

 @RequestMapping(value="/example.html",method = RequestMethod.GET)
      public String example(
          @RequestParam(value = "q", defaultValue = "") String query,
          @RequestParam(value = "page", required = false, defaultValue = "1") int page,
          HttpServletRequest request, Model model){}