Question

在我的Spring MVC项目中，我无法使用scope = session访问bean的参数.Itto Http会话中有一个名为“scopedTarget.user”的bean。我想在jsp页面中打印用户名。为什么访问这些参数如此困难？我哪里错了？

ControllerHome：

@Controller
public class ControllerHome {

@Autowired
private User user;

@RequestMapping(value="/",method=RequestMethod.GET)
public String welcome(ModelMap model){
    model.addAttribute("utente", user);
    return "index";
}

@RequestMapping(value="/add",method=RequestMethod.GET)
public String add(@ModelAttribute("utente") User utente,HttpServletRequest request){
    HttpSession session=request.getSession();
    Enumeration<String> list=session.getAttributeNames();
    while(list.hasMoreElements())
        System.out.println(list.nextElement());
    return "redirect:/";
}

}

的index.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>

<form:form method="get" action="add" modelAttribute="utente">

    <form:input path="nome"/>
    <input type="submit" value="submit">        
</form:form>
<c:out value="${sessionScope['scopedTarget.user'].nome}"/>

</body>
</html>

User.java：

public class User implements Serializable{

/**
 * 
 */
private static final long serialVersionUID = 1L;
private String nome;

public User(){}

public String getNome() {
    return nome;
}

public void setNome(String nome) {
    this.nome = nome;
}


}

的web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">

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

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

</web-app>

配置-servlet.xml中

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.1.xsd
    http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd
    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-4.1.xsd
    http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.1.xsd">

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

<context:component-scan base-package="controller"/>

<mvc:annotation-driven/>

<bean class="coreservlets.User" id="user" name="user" scope="session">
    <aop:scoped-proxy/>
</bean>

</beans>

Answer 1

如果将这些anotations @Component和@Scope(value = "session", proxyMode = ScopedProxyMode.TARGET_CLASS)添加到要在会话中管理的POJO中，则可以使用您在问题中提及的方法在JSP中使用它（和在您的控制器中自动装配它）。确保两件事：

不要覆盖toString（），否则将是分配给${sessionScope['scopedTarget.user']的结果。
你的POJO，在这种情况下是用户，需要被Spring的组件扫描器“抓住”

Spring：bean在jsp中使用scope = session

1 个答案: