Question

我在Stack Overflow上搜索过，但找不到我的查询的解决方案。我有一个控制器功能，可以在GET请求中添加多个模型属性

  @RequestMapping(method = RequestMethod.GET, value = "/showdeletesearchqueryform")
  public String showDeleteSearchQuery(final Model model) {
    if (LOG.isDebugEnabled()) {
      LOG.debug("Fetching all the search query results.");
    }
    ImmutableList<ArtQueryResults> results = this.searchQueriesService
        .getSearchQueries(APPNAME);

    // Adding model attribute # 1
    model.addAttribute("searchResults", results);
    if (LOG.isDebugEnabled()) {
      LOG.debug("\"searchResults\" model attribute has been intialized from "
          + results);
    }
    ArtDeleteQueryRequest request = new ArtDeleteQueryRequest();
    request.setAppName(APPNAME);
    if (LOG.isDebugEnabled()) {
      LOG.debug("Model attribute initialized = " + request);
    }
    // Adding model attribute # 2
    model.addAttribute("deletedAttributes", request);
    return "deletesearchqueries";
  }

我的JSP

<div class="column-group">
           <form:form method="POST" action="${pageContext.request.contextPath}/arttestresults/showdeletesearchqueryform" modelAttribute="deletedAttributes">
             <form:errors path="*" cssClass="alert alert-danger column lg-units-5 units-2" element="div"/>
             <form:hidden path="appName" id="appNameId" htmlEscape="true"/>
             <div class = "units-1 column lg-units-12">
         <!--  Hidden Key for app name. -->


         <form:select path="idsToBeDeleted" id="IdsToBeDeletedSelectId">
           <c:forEach items="${searchResults}" var="searchResult" varStatus="loop">
       <form:option label="${searchResult.searchQuery}" value="${searchResult.id}" />
      </c:forEach>
         </form:select>
        </div>
        <div class="units-1 column lg-units-12">   
            <%-- This is a hack that make sure that form is submitted on a click. Not sure why form is not being submitted. --%>
           <button class="button" type="submit" onclick="javascript:$('form').submit();">Delete Selected Queries</button>
        </div>
           </form:form>

我的控制器POST功能

  @RequestMapping(method = RequestMethod.POST, value = "/showdeletesearchqueryform")
  public String deleteSearchQueries(
      Model model,
      @ModelAttribute(value = "deletedAttributes") @Valid final ArtDeleteQueryRequest request,
      final BindingResult result) {
    if (result.hasErrors()) {
      LOG.warn("There are " + result.getErrorCount() + " validation errors.");
      return "deletesearchqueries";
    } else {
      if (LOG.isDebugEnabled()) {
        LOG.debug("The ids to be deleted are " + request.getIdsToBeDeleted());
      }
      this.searchQueriesService.deleteSearchQueriesById(
          ImmutableList.copyOf(request.getIdsToBeDeleted()));
      return "redirect:/arttestresults/showdeletesearchqueryform";
    }
  }

如果验证失败，当我在错误条件下返回视图时，未获取模型属性 searchResults ？有没有办法保留其他定义的模型属性？

Answer 1

似乎你需要在春季3.1中添加的flash属性。请看一下示例/解释：

http://viralpatel.net/blogs/spring-mvc-flash-attribute-example/

Answer 2

获取和发布是不同的请求。您在post请求中得到的只是来自表单的内容，因此只有"deletedAttributes"模型属性，而只有JSP中的<input>字段。

您需要像在get方法中那样明确地再次放置searchResults模型属性。

正如M. Deinum所建议的那样，如果控制器中的所有方法都使用了一个或多个属性，您可以使用@ModelAttribute带注释的方法将它（它们）自动放入模型中。 / p>

您还可以在Spring的Petclinic example中使用SessionAttributes model attributes, that is attributes that are stored in session and not in request. But it is hard to have them properly cleaned from session if user do not post the form but go into another part of the application. You have an example of usage of SessionAttributes。

Spring MVC：如何在spring验证错误中保留模型属性

2 个答案: