Spring MVC的@RequestAttribute注解和@SessionAttribute注解的使用

喜欢ヅ旅行 2021-07-24 16:53 460阅读 0赞

**一 视图**

<%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    <!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=UTF-8">
    <title>@RequestAttribute和@SessionAttribute测试</title>
    </head>
    <body>
    <h2>@RequestAttribute和@SessionAttribute测试</h2>
    <a href="attrbuteTest">测试@RequestAttribute和@SessionAttribute</a>
    
    </body>
    </html>

**二 控制器**

package org.fkit.controller;
    
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RequestAttribute;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.SessionAttribute;
    import org.springframework.web.servlet.ModelAndView;
    
    @Controller
    public class AttributeController{
    
        // 测试@CookieValue注解
        // 该方法映射的请求为 /cookieValueTest
        @GetMapping(value="/attrbuteTest")
         public ModelAndView attrbuteTest(ModelAndView mv) {
            System.out.println("attributeTest方法被调用...");
             // 客户端重定向到main请求，会被自定义过滤器拦截
             mv.setViewName("redirect:main");;
             return mv;
         }
        
        /*
         *  该方法映射的请求为/main
         *  @RequestAttribute("school")会获取request作用范围中名为"school"的属性的值赋给school变量
         *  @SessionAttribute("author")会获取session作用范围中名为"author"的属性的值赋给author变量
         */
         @RequestMapping("/main")
         public String main(
                 @RequestAttribute("school") String school,
                 @SessionAttribute("author") String author) {
             System.out.println("main方法被调用...");
             // 输出@RequestAttribute获得的school
             System.out.println("school: " + school);
            // 输出@SessionAttribute获得的author
             System.out.println("author: " + author);
             
             return "welcome";
         }
    
    }

**三 拦截器**

package org.fkit.filter;
    
    import java.io.IOException;
    import javax.servlet.Filter;
    import javax.servlet.FilterChain;
    import javax.servlet.FilterConfig;
    import javax.servlet.ServletException;
    import javax.servlet.ServletRequest;
    import javax.servlet.ServletResponse;
    import javax.servlet.annotation.WebFilter;
    import javax.servlet.http.HttpServletRequest;
    
    // 过滤器拦截/main请求
    @WebFilter(value="/main")
    public class TestAttributeFilter implements Filter{
                
        @Override
        public void destroy() {
            // TODO Auto-generated method stub
            
        }
    
        @Override
        public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain chain)
                throws IOException, ServletException {
            
            System.out.println("进入AuthFilter过滤器的doFilter方法");
            // 将ServletRequest对象强转成HttpServletRequest对象
            HttpServletRequest request = (HttpServletRequest)arg0;
            // 在request作用范围域中设置一个school属性
            request.setAttribute("school", "疯狂软件");
            // 在session作用范围域中设置一个author属性
            request.getSession().setAttribute("author", "肖文吉");
            // 如果还有过滤器执行过滤器，否则进入请求处理方法
            chain.doFilter(request, arg1);
            
        }
    
        @Override
        public void init(FilterConfig arg0) throws ServletException {
            // TODO Auto-generated method stub
            
        }
    
    }

**四 配置文件**

<?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:p="http://www.springframework.org/schema/p"
        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/mvc
            http://www.springframework.org/schema/mvc/spring-mvc.xsd     
            http://www.springframework.org/schema/context
             http://www.springframework.org/schema/context/spring-context.xsd">
            
        
        <context:component-scan base-package="org.fkit.controller"/>
        
        <mvc:annotation-driven/>
         
        <mvc:default-servlet-handler/>
        
        
         <bean id="viewResolver"
               class="org.springframework.web.servlet.view.InternalResourceViewResolver"
              p:prefix="/WEB-INF/content/" p:suffix=".jsp"/>
        
    </beans>

**五 测试**

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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70]: /images/20210724/0d30bf0abbaf480093661a652762228b.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 1]: /images/20210724/36772053d3af4f49a6297058c55677c9.png