Spring MVC不支持请求方法“GET”

Question

控制器中有以下代码

  private static final String CJOB_MODEL    = "cJobNms";

  @RequestMapping(value = MAIN_VIEW, method = RequestMethod.POST)
  public String showTestXsd(//@ModelAttribute(FORM_MODEL) TestXsdForm xsdForm,
            //@ModelAttribute(MODEL) @Valid
            //TestXsdTable testXsdTable,
            @RequestParam String selected,
            Model model) throws DataException {

        String cJobNm =null;
        List<String> cJobNmList = null;
        System.out.println("selected:"+ selected);
        String xsdView = testXsdService.getXsdString();
        cJobNmList = testXsdService.getCJobNm();
        Set<String> cJobNmSet = new HashSet<String>(cJobNmList);
        TestXsdForm xsdForm = new TestXsdForm();
        model.addAttribute("xsdView", xsdView);
        model.addAttribute("xsdFormModel", xsdForm);
        model.addAttribute(CJOB_MODEL, cJobNmSet);
        xsdForm.setXsdString(xsdView);

        return MAIN_VIEW;
    }

以及我的jsp中的以下代码。

<form:form modelAttribute="testXsdTable" name="xsdForm" action="/xsdtest/testXsdTables"
                        id="xsdForm" method="POST" class="form"
                                            enctype="multipart/form-data" >


            <tr>
             <td>
              <label for="cJobs" class="fieldlabel">Jobs:</label>
               <select id="cJobs" name="cJobs" >
                <option value="${selected}" selected>${selected}</option>
                <c:forEach items="${cJobNms}" var="table">
                    <c:if test="${table != selected}">
                            <option value="${table}">${table}</option>
                        </c:if>
                 </c:forEach>
               </select>
            </td>
            </tr>
            <pre>
               <c:out value="${xsdForm.xsdString}"/>
            </pre>
<div class="confirmbuttons">
    <a href="#"class="button positive" id="saveXsdButton" onclick="saveTestXsd();">
        <span class="confirm">Save</span>
    </a>
</div>

当用户从cJobNms列表中选择选项时，所选值应显示在控制器方法showTestXsd中。请让我知道我做错了什么。

目前我收到一条消息：不支持请求方法“GET”

 @RequestMapping(value = SAVE_VIEW, method = RequestMethod.POST)
public String saveTestXsd( @ModelAttribute(MODEL) @Valid
                            TestXsdTable testXsdTable,
                            final BindingResult result,
                            final Principal principal,
                            Model model) throws DataException {

    boolean isNew = true;
    System.out.println("entering saveTestXsd in controller");
    Map<String,Object> modelMap = model.asMap();
    String xsdView = (String)modelMap.get("xsdView");
    System.out.println("xsdView:::"+ xsdView);
    if(testXsdTable!= null){
         System.out.println("xsdView(testXsdForm):::"+ testXsdTable.getXsdView());
    }


    // Check for validation errors
    if (result.hasErrors()) {
        return SAVE_VIEW;
    }

    // Get the user information
    User loggedInUser = (User) ((Authentication) principal)
                        .getPrincipal();

    return SAVE_VIEW;
}

Answer 1

使用下一个代码

@RequestMapping(value = MAIN_VIEW, method = RequestMethod.GET)
//if you want to use both ( post and get ) remove Request Method annotation

//@RequestMapping(value = MAIN_VIEW)
@RequestParam(value="cJobs", required = false) String selected; 
//use this to handle an optional parameter

Answer 2

代替

@RequestMapping(value = MAIN_VIEW, method = RequestMethod.POST)

具有

@RequestMapping(value = MAIN_VIEW, method = RequestMethod.GET)

您还应该考虑更改form POST方法。你的用例更多的是Get而不是POST

Answer 3

我将开始一个答案，并在详细信息可用时添加到其中。对于您当前的错误

org.springframework.web.bind.MissingServletRequestParameterException: Required String parameter 'selected' is not present

这是因为当你有

@RequestParam String selected,

并且，@RequestParam没有值属性集，Spring将使用参数的名称来查找要绑定的请求参数。在您的表单中，显然没有一个名为“selected”的参数。你想要的是获得价值

<select id="cJobs" name="cJobs" >

因此，将您的@Request estParam更改为

@RequestParam(value = "cJobs") String selected

要匹配输入元素的名称属性，请选择输入元素。