Question

在post方法中接受参数＆＃34; updateButton＆＃34;和＆＃34; reviewButton＆＃34;。如果您只注册params = {"reviewButton"}并点击＆＃34; reviewButton＆＃34;，request.getParameter ("reviewButton") == reviewButton，如果注册getParameter的两个参数返回空值。

如何确定按下哪个按钮？

页

  <form  action="update" name ="updateCourseDTO" " action='<@spring.url "/update" />' method="POST"/>
    <fieldset>
      <div class="control-group">
        <label class="control-label">Name</label>
        <div class="controls">

        <@spring.formInput "updateCourseDTO.name"   ""/>
        <@spring.showErrors  '<br>',"error" />

        </div>
      </div>
      <div class="control-group">
        <label class="control-label">Category</label>
        <div class="controls">
          <@spring.formSingleSelect "updateCourseDTO.category" listCategories "" />
          <@spring.showErrors '<br>',"error" />
        </div>
      </div>

      <div class="control-group">
        <label class="control-label">Description</label>
        <div class="controls">
          <@spring.formInput "updateCourseDTO.description"/>
          <@spring.showErrors "updateCourseDTO.description","error" />
        </div>
      </div>
      <div class="control-group">
        <label class="control-label">Links</label>
        <div class="controls">
         <@spring.formInput "updateCourseDTO.links"/>
         <@spring.showErrors "updateCourseDTO.links","error" />
        </div>
      </div>
      <div class="control-group">
        <label class="control-label">Minimal Subscribers</label>
        <div class="controls">

        <@spring.formInput "updateCourseDTO.minSubscribers" ""/>
        <@spring.showErrors  'updateCourseDTO.minSubscribers',"error" />
        </div>
      </div>
       <div class="control-group">
        <label class="control-label">Minimal Attende</label>
        <div class="controls">

        <@spring.formInput "updateCourseDTO.minAttendes" ""/>
        <@spring.showErrors  'updateCourseDTO.minAttendes',"error" />
        </div>
      </div>
      <div class="form-actions" >
        <button id="updateButton" name="updateButton"   class="btn btn-primary" type="submit"  >Update</button>
       <button id="reviewButton" name="reviewButton"    class="btn btn-warning" type="submit"  >Review</button>
      </div>
    </fieldset>
  </form>

控制器

@RequestMapping(value = "/courses/{id}/update", method = RequestMethod.POST, params = { "updateButton", 
        "reviewButton" })
 public String updateCoursePost(Model model, HttpSession session,
        HttpServletRequest request, @PathVariable("id") Integer courseId,
        @Valid UpdateCourseDTO updateCourseDTO, BindingResult result)
        throws AddressException, Exception {

        if (request.getParameter("updateButton") != null) {}
        if (request.getParameter("reviewButton") != null) {}

Answer 1

正如我从documentation看到的那样，params正在缩小映射范围。因此，通过指定params = { "updateButton", "reviewButton" }，只有当请求中存在两个参数时，才会告诉Spring映射方法，这是不可能的，因为无法同时单击两个按钮。所以，你要么省略params捕捉方法中的两个按钮并在方法中做出选择：

 @RequestMapping(value = "/courses/{id}/update", method = RequestMethod.POST)
 public String updateCoursePost(Model model, HttpSession session,
        HttpServletRequest request, @PathVariable("id") Integer courseId,
        @Valid UpdateCourseDTO updateCourseDTO, BindingResult result)
        throws AddressException, Exception
 {

        if (request.getParameter("updateButton") != null) {doUpdate(...);}
        else if (request.getParameter("reviewButton") != null) {doReview(...);}
        else {WHAAAT?!}
 }

或者，正如我所希望的那样，做两种不同的方法：

 @RequestMapping(value = "/courses/{id}/update", method = RequestMethod.POST, params = {"updateButton"})
 public String updateCoursePost(Model model, HttpSession session,
        HttpServletRequest request, @PathVariable("id") Integer courseId,
        @Valid UpdateCourseDTO updateCourseDTO, BindingResult result)
        throws AddressException, Exception
 {
           doUpdate(...);
 }

 @RequestMapping(value = "/courses/{id}/update", method = RequestMethod.POST, params = {"reviewButton"})
 public String reviewCoursePost(Model model, HttpSession session,
        HttpServletRequest request, @PathVariable("id") Integer courseId,
        @Valid UpdateCourseDTO updateCourseDTO, BindingResult result)
        throws AddressException, Exception
 {
           doReview(...);
 }

post方法中的请求和按钮

1 个答案: