how to access a ModelAndView object within the jsp

问题:

I have a code like this in my controller.

ModelAndView result = new ModelAndView("person/sometrends");  
result.addObject("data", data);  // data -> Map

In my JSP page I have written some Java code that is dependent on the data object. How can I get that data object within the JSP code?

I tried something like this (pseudo code).

<%
    Map x = ${data};
%>

But that doesn't work. Not sure how to access it.

回答1:

In a scriptlet, you use the request object like so:

<% Map myMap = (Map) request.getAttribute("data"); %>

If you want to use something like JSTL instead of a scriptlet, you could do:

<c:forEach var="entry" items="${data}">
Name:  ${entry.key} <br/>
Value: ${entry.value} <br/>
</c:forEach>

As Davemeister and novice pointed out, combining EL inside a scriptlet was the root cause of your error.

回答2:

Let me more specific, if you want to use jsp instead of jstl to access the Model you would do something like this:

<% Map x = (Map)request.getAttribute("data") %>

回答3:

Try this:

request.getAttribute("data")

回答4:

try<% String username = (String)request.getAttribute("data"); %>

回答5:

Using expression language inside the scriptlet would be the cause.

回答6:

include: <%@ taglib prefix="spring" uri="http://www.springframework.org/tags"%>

and then...

<%
    Map x = ${data};
%>