Spring 模型未应用

Question

我有以下 jsp 标记：

<p>The name of the workplace is ${w}</p>

控制器：

@Controller
public class HelloController{

    @Autowired
    private WorkplacementDao workplacementDao;

    @RequestMapping("/hello")
    public String hello(ModelMap m){
        String workplaceName = workplacementDao.getNameById(2);
        m.addAttribute("w", workplaceName);
        return "hello";
    }
   //...
}

dispatcher-servlet.xml 如下：

<context:component-scan base-package="com.mycompany.maventestwebapp" />

<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="prefix" value="/WEB-INF/views/" />
    <property name="suffix" value=".jsp" />
</bean>

<bean id="dataSource" class="org.springframework.jndi.JndiObjectFactoryBean">
    <property name="jndiName" value="java:comp/env/jdbc/introDB"/>
</bean>

<bean id="workplacementDao" class="com.mycompany.maventestwebapp.db.dao.WorkplacementDAOImpl">
    <property name="dataSource" ref="dataSource" />
</bean>

现在，当我在浏览器中请求 /hello 页面时，我只得到：

The name of the workplace is ${w}

${w} 未替换为其实际值。为什么？怎么了？

UPD：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>
    <servlet>
        <servlet-name>dispatcher</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>dispatcher</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

</web-app>

Answer 1

这不是 Spring 问题。正如评论中所建议的那样，您的表达式没有被评估，因为您的 web.xml 没有指定支持该功能的 Servlet/JSP API 的现代版本。

将您的 web.xml 更改为开头：

<?xml version="1.0" encoding="ISO-8859-1" ?>
<web-app 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"
         version="2.4">

    <servlet>
    .....

Spring 模型未应用

Spring model isn't applied

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web.xml

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