When using .jsp's view spring mvc, and passing ModelAndView, how to output model?
If I have a modelandView like:
ModelAndView mav = new ModelAndView();
mav.setViewName("index");
mav.addObject("message", "hello, world");
return mav;
In index.开发者_如何学Pythonjsp, how do I output the value of "message"?
And what if I passed in:
mav.addObject("user", currentUser);
It seems the docs jump straight into forms handling.
You can output it by using the EL language like this:
${message} and ${user}
In your jsp. Spring with automatically scan the jsp and process these and other EL expressions.
You can use
<c:if test="${message!=null}">
${message}
</c:if>
1- If you are using the old JSP 1.2 descriptor, defined by DTD for example web.xml
<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd" >
<web-app>
//...
</web-app>
The EL is disabled or ignored by default, you have to enable it manually, so that it will outputs the value store in the message model.
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
<%@ page isELIgnored="false" %>
</head>
<body>
${message}
</body>
</html>
2- In JSP 2.0
If you are using the standard JSP 2.0 descriptor, defined by w3c schema ,for example web.xml
<web-app id="WebApp_ID" version="2.4"
xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
//...
</web-app>
The EL is enabled by default, and you should see the value stored in the message model, which is hello world.
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