JSP无法获取Model的值

    @RequestMapping(path = "/", method = GET)
    public String index(Model model)
            throws Exception {
        logger.info("processed by index");
        model.addAttribute("msg", "GOGOGO");
        return "go.jsp";
    }

<html>
<body>
${msg}
</body>
</html>

在页面中直接显式${msg}。参照http://blog.csdn.net/qq_24755999/article/details/72781275的解法：

JSP无法解析EL表达式。

两种解决办法：

在JSP顶部加入isELIgnored="false"

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" isELIgnored="false" %>

在web.xml的头部加入缺少的东西 Maven Archetype自动生成的如下

<!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>
  <display-name>Archetype Created Web Application</display-name>
</web-app>

替换成：

<?xml version="1.0" encoding="UTF-8"?>  
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"   
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
      xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee  
      http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"  
      version="4.0">  
        
</web-app>

Ref:http://www.oracle.com/webfolder/technetwork/jsc/xml/ns/javaee/index.html#1

shui/jsp-cannot-get-value-from-Model.md