问题:
spring m开发过程中, 经常会给model addAttribute, 然后通过EL在中显示,比如 ${msg}, 但是有时候会出现jsp最后显示的还是${msg},而不是msg赋值过的。Spring Controllerimport javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.web.servlet.ModelAndView;import org.springframework.web.servlet.mvc.AbstractController;public class ABCController extends AbstractController{ @Overrideprotected ModelAndView handleRequestInternal(HttpServletRequest request,HttpServletResponse response) throws Exception { ModelAndView model = new ModelAndView("HelloWorldPage");model.addObject("msg", "hello world");return model;}}JSP page<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>${msg}解决方法:原因在于老的JSP 1.2 声明.1. JSP 1.2如果你用的jsp1.2版本的DTDweb.xml"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN""http://java.sun.com/dtd/web-app_2_3.dtd" >//...EL是默认关闭的。。。必须手动打开。<%@ page isELIgnored="false" %><%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %><%@ page isELIgnored="false" %>${msg}2. JSP 2.0JSP2.0默认是打开支持EL的,所以声明jsp2.0就可以直接用了。web.xmlxmlns="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">//...