使用带注释的控制器在 JSP 中的会话

Question

我从我的Spring MVC控制器在会话中存储一个值，这样：

@RequestMapping("usuario/getbyname")
public ModelAndView getByName(@ModelAttribute("user")Usuario user, HttpServletRequest request)
{
    ModelAndView model=new ModelAndView();
    request.getSession().setAttribute("username", "nouser");
    model.setViewName("home");
    return model;
}

然后，在 JSP 中：

Value in session: ${sessionScope.username}

但是JSP中没有显示任何内容。我做错了什么？谢谢。

编辑：

描述符（servlet-context.xml，root-context 为空）：

<?xml version="1.0" encoding="UTF-8"?>
<beans:beans xmlns="http://www.springframework.org/schema/mvc"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:beans="http://www.springframework.org/schema/beans"
    xmlns:mvc="http://www.springframework.org/schema/mvc" 
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
                        http://www.springframework.org/schema/beans/spring-beans.xsd
                        http://www.springframework.org/schema/context 
                        http://www.springframework.org/schema/context/spring-context.xsd
                        http://www.springframework.org/schema/mvc
                        http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd">

    <!-- DispatcherServlet Context: defines this servlet's request-processing infrastructure -->
    <!-- Enables the Spring MVC @Controller programming model -->
    <annotation-driven />
    <mvc:annotation-driven />
    <!-- Handles HTTP GET requests for /resources/** by efficiently serving up static resources in the ${webappRoot}/resources directory -->
    <resources mapping="/resources/**" location="/resources/" />
    <!-- Resolves views selected for rendering by @Controllers to .jsp resources in the /WEB-INF/views directory -->
    <beans:bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <beans:property name="prefix" value="/WEB-INF/views/" />
        <beans:property name="suffix" value=".jsp" />
    </beans:bean>
        <!--  <beans:bean class="my.package.Controllers.LoginController"></beans:bean>-->
    <beans:bean class="my.package.Controllers.NewUserFormController"></beans:bean>
    <beans:bean class="my.package.Controllers.QueEsController"></beans:bean>
    <beans:bean class="my.package.Services.UsuarioServiceImp"></beans:bean>
    <beans:bean class="my.package.Dao.UserDaoImp">
        <beans:property name="dataSource" ref="dataSource"></beans:property>
    </beans:bean>
    <beans:bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <beans:property name="driverClassName" value="com.mysql.jdbc.Driver"></beans:property>
        <beans:property name="url" value="jdbc:mysql://localhost:3306/myscheme"></beans:property>
        <beans:property name="username" value="root"></beans:property>
        <beans:property name="password" value="root"></beans:property>
    </beans:bean>
    <beans:bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <beans:property name="dataSource" ref="dataSource"></beans:property>
    </beans:bean>
       <context:component-scan base-package="my.package" />
</beans:beans>

控制器中的方法：

@RequestMapping("usuario/getbyname")
public ModelAndView getByName(@ModelAttribute("user")Usuario user, HttpServletRequest request){
    Usuario userFromDB;
    ModelAndView model=new ModelAndView();

    userFromDB=usuarioService.getUserByName(user.nombre);
    if(userFromDB==null){
        request.getSession().setAttribute("username", "nouser");
        model.setViewName("home");
        return model;
    }

        if(user.getNombre().equals(userFromDB.getNombre())&& user.getPass().equals(userFromDB.getPass())){
        model.addObject("login", "ok");
        model.addObject("usuario", user.getNombre());
        model.setViewName("home");
        return model;
        }else{
            model.addObject("login", "nopass");
            model.setViewName("home");
            return model;
        }
    }

JSP的相关部分：

<form action="usuario/getbyname" method="post">
<table>
    <tr>
        <td>
        <label class="textform">Nombre de usuario:</label>                  
        </td>
        <td>
        <input type="text" name="nombre"/>
        </td>
    </tr>
    <tr>
        <td>
        <label class="textform">Password:</label>
        </td>
        <td>
        <input type="password" name="pass">         
        </td>       
    </tr>
    <tr>
        <td>
        <input type="submit" value="Login">
        </td>
        <td class="textform">
        <a href="<c:url value="/newuserform" />" >Regístrate</a>
        <a href="<c:url value="/lostpass" />" >Recuperar contraseña</a>
        </td>
    </tr>

</table>    
</form>
<P>  The time on the server is ${serverTime}. </P>
<P> blablablablabla</P>
<p>Username: ${sessionScope.username}.

JSP 位于 webapp/web-inf/views

Answer 1

我以不同的方式使用它（并且工作正常）：

@Component
@Scope (value = "session", proxyMode = ScopedProxyMode.TARGET_CLASS)
public class UserSessionObject implements Serializable {
    //PUT HERE YOUR VARIABLES
}

@Controller
@RequestMapping ("/product")
public class Advertise {
    @Autowired
    private UserSessionObject userSessionObject;
    ModelAndView mv = new ModelAndView();
    //DO YOUR CTL STUFF HERE
    mv.addObject("session", userSessionObject);
    return mv;
}

春天必须拿起那两节课。

在你的JSP中，你可以使用${session.yourThing}