27、(知識篇)SpringMVC04 SpringMVC 傳值/SessionAttributes
阿新 • • 發佈：2019-01-01
/**
* SpringMVC 傳值
* 1、使用ModelAndView類 進行傳值
* 相當於request.setAttribute("xxx",obj);
* 2、使用map傳值
*
* 3、使用@SessionAttributes 需要在類上面宣告註解
* 當map在put入key的時候會根據 session的註解講key的值放入到sesion中
*
* @return
*/
測試類：
package com.spring.controller; import java.util.Map; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.SessionAttributes; import org.springframework.web.servlet.ModelAndView; @Controller @SessionAttributes(value="user") public class TestController { /** * SpringMVC 傳值 * 1、使用ModelAndView類 進行傳值 * 相當於request.setAttribute("xxx",obj); * 2、使用map傳值 * * 3、使用@SessionAttributes 需要在類上面宣告註解 * 當map在put入key的時候會根據 session的註解講key的值放入到sesion中 * * @return */ //http://127.0.0.1:8080/27SpringMVC04/testModelAndView @RequestMapping(value="testModelAndView") public ModelAndView testModelAndView(){ System.out.println("modelAndView..."); ModelAndView mv = new ModelAndView("index"); mv.addObject("msg", "HelloWorld"); return mv; } //http://127.0.0.1:8080/27SpringMVC04/testMap @RequestMapping(value="testMap") public String testMap(Map<String,Object> map){ map.put("msg", "你好！"); return "index"; } @RequestMapping("testSessionAttribute") public String testSessionAttribute(Map<String,Object> map){ map.put("user","你的名字"); return "index"; } }
springmvc.xml
<?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: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-4.3.xsd"> <context:component-scan base-package="com.spring"></context:component-scan> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="suffix" value=".jsp"></property> <property name="prefix" value="/WEB-INF/views/"></property> </bean> </beans>
web-inf/views/index.jsp:
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <base href="<%=basePath %>"> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> </head> <body> ${msg } <br> user: ${user } <br> user sessionScope: ${sessionScope.user } </body> </html>
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">
<display-name>27SpringMVC04</display-name>
<filter>
<filter-name>HiddenHttpMethodFilter</filter-name>
<filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>HiddenHttpMethodFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- The front controller of this Spring Web application, responsible for handling all application requests -->
<servlet>
<servlet-name>springDispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springmvc.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<!-- Map all requests to the DispatcherServlet for handling -->
<servlet-mapping>
<servlet-name>springDispatcherServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>