如果測試沒有顯示代碼部分 - 春天mvc

Question

我有一個地區在我的jsp，我想通過測試顯示部門列表，如果列表不是空的。這是我addDeparment.jsp代碼文件

<c:if test="${!empty departments}"> 
    <table align="center" border="1"> 
     <tr> 
      <th>Department ID</th> 
      <th>Department Name</th> 
      <th>Options</th> 
     </tr> 

     <c:forEach items="${departments}" var="department"> 
      <tr> 
       <td><c:out value="${department.departmentId}"/></td> 
       <td><c:out value="${department.departmentName}"/></td> 
       <td align="center"><a href="editDepartment?departmentId=${department.departmentId}">Edit</a> | <a href="deleteDepartment?departmentId=${department.departmentId}">Delete</a></td> 
      </tr> 
     </c:forEach> 
    </table> 
</c:if> 

這是一個得到所有的部門，其附加到一個HashMap集合控制器

@RequestMapping(value = "/addDepartment", method = RequestMethod.GET) 
    public ModelAndView addCategory(@ModelAttribute("command") Department department, 
      BindingResult result) { 
     Map<String, Object> model = new HashMap<String, Object>(); 
     model.put("departments", departmentService.getDepartments()); 
     return new ModelAndView("addDepartment"); 
    } 

如果我運行代碼的這一部分在jsp文件中查看不顯示

<tr> 
      <th>Department ID</th> 
      <th>Department Name</th> 
      <th>Options</th> 
     </tr> 

找不出什麼可能是錯的。

Answer 1

在控制器中，你需要你的模型傳遞給ModelAndView對象如下：

return new ModelAndView("addDepartment", model); 

參考文獻：

http://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/web/servlet/ModelAndView.html#ModelAndView-java.lang.String-java.util.Map-