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springMVC后台的值无法通过ModelAndView的addObject传到前台5

我将studentList放入request作用域中jsp可以访问,为什么通过ModelAndView的addObject方法放入后,前台就无法访问。

后台方法:
@RequestMapping("/studentList")
public ModelAndView studentList(HttpServletRequest request) throws Exception{
ModelAndView mav = new ModelAndView("studentList");
// List<Student> studentList = iStudentService.queryAllStudent();
// System.out.println(studentList.size());
// request.setAttribute("studentList", studentList);
mav.addObject("studentList", iStudentService.queryAllStudent());
mav.addObject("xx", "xx");
// mav.addObject("studentList",studentList);
return mav;
}
前台代码
<body>
${xx}
<table border="1">
<tr>
<td>id</td><td>name</td><td>birthday</td><td>creatTime</td>
</tr>
<c:forEach items="${studentList}" var="student">
<tr>
<td>${student.id}</td>
<td>${student.name}</td>
<td>${student.birthday}</td>
<td>${student.createTime}</td>
</tr>
</c:forEach>
</table>
</body>

2012年12月16日 16:48

1个答案 按时间排序 按投票排序

0 0

采纳的答案

按照标准用法的话应该是没问题
内部其实把model 通过request.setAttribute(modelName, modelValue); 放入的

	protected void exposeModelAsRequestAttributes(Map<String, Object> model, HttpServletRequest request) throws Exception {
		for (Map.Entry<String, Object> entry : model.entrySet()) {
			String modelName = entry.getKey();
			Object modelValue = entry.getValue();
			if (modelValue != null) {
				request.setAttribute(modelName, modelValue);
				if (logger.isDebugEnabled()) {
					logger.debug("Added model object '" + modelName + "' of type [" + modelValue.getClass().getName() +
							"] to request in view with name '" + getBeanName() + "'");
				}
			}
			else {
				request.removeAttribute(modelName);
				if (logger.isDebugEnabled()) {
					logger.debug("Removed model object '" + modelName +
							"' from request in view with name '" + getBeanName() + "'");
				}
			}
		}
	}


一个可能是你实现了HandlerInterceptor并实现了:
void postHandle(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, java.lang.Object o, org.springframework.web.servlet.ModelAndView modelAndView) throws java.lang.Exception;

在此处修改了modelAndView

如果方便可以贴全代码,或者把代码站内信我

2012年12月16日 17:14

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