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SpringMVC5-域对象共享数据

article 2024/9/30 16:46:45

目录

使用ServletAPI向request域对象共享数据

使用ModelAndView向request域对象共享数据

使用Model向request域对象共享数据

使用map向request域对象共享数据

使用ModelMap向request域对象共享数据

Model、ModelMap、Map的关系

向session域共享数据

向application域共享数据

创建模块springMVC-demo3

web.xml：

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">

  <!--配置springMVC的编码过滤器-->
  <filter>
    <filter-name>CharacterEncodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
    <init-param>
      <param-name>forceResponseEncoding</param-name>
      <param-value>true</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>CharacterEncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

  <!--注册前端控制器-->
  <servlet>
    <servlet-name>DispactcherServlet</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>
  <servlet-mapping>
    <servlet-name>DispactcherServlet</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>

</web-app>

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 https://www.springframework.org/schema/context/spring-context.xsd">

    <!--扫描组件-->
    <context:component-scan base-package="com.qcby.mvc.controller"></context:component-scan>

    <!-- 配置Thymeleaf视图解析器 -->
    <bean id="viewResolver" class="org.thymeleaf.spring5.view.ThymeleafViewResolver">
        <property name="order" value="1"/>
        <property name="characterEncoding" value="UTF-8"/>
        <property name="templateEngine">
            <bean class="org.thymeleaf.spring5.SpringTemplateEngine">
                <property name="templateResolver">
                    <bean class="org.thymeleaf.spring5.templateresolver.SpringResourceTemplateResolver">
                        <!-- 视图前缀 -->
                        <property name="prefix" value="/WEB-INF/templates/"/>
                        <!-- 视图后缀 -->
                        <property name="suffix" value=".html"/>
                        <property name="templateMode" value="HTML5"/>
                        <property name="characterEncoding" value="UTF-8" />
                    </bean>
                </property>
            </bean>
        </property>
    </bean>

</beans>

index.html：

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<h1>首页</h1>
</body>
</html>
package com.qcby.mvc.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class TestController {

    @RequestMapping("/")
    public String index(){
        return "index";
    }
}

使用ServletAPI向request域对象共享数据

首页点击超链接，会对应控制器方法，通过ServletAPI向request中共享数据，通过转发跳转到success.html页面，通过thymeleaf获取域对象中的数据值

package com.qcby.mvc.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.servlet.http.HttpServletRequest;

@Controller
public class ScopeController {

    /**
     * 使用ServletAPI向request域对象共享数据
     * @return
     */
    @RequestMapping("/testRequestByServletAPI")
    public String testRequestByServletAPI(HttpServletRequest request){
        //键值对：键testRequestScope  值hello,ServletAPI
        request.setAttribute("testRequestScope","hello,ServletAPI");
        return "success";
    }
}

index.html：

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<h1>首页</h1>
<a th:href="@{/testRequestByServletAPI}">通过ServletAPI向request域对象共享数据</a>
</body>
</html>

success.html：

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
success<br>
<p th:text="${testRequestScope}"></p>
</body>
</html>

 

使用ModelAndView向request域对象共享数据

package com.qcby.mvc.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;

@Controller
public class ScopeController {

    @RequestMapping("/testModelAndView")
    public ModelAndView testModelAndView(){
        /**
         * ModelAndView有Model和View的功能
         * Model主要用于向请求域共享数据
         * View主要用于设置视图，实现页面跳转
        */
        ModelAndView mav = new ModelAndView();
        //处理模型数据，即向请求域request共享数据
        mav.addObject("testRequestScope","hello,ModelAndView");
        //设置视图名称
        mav.setViewName("success");
        return mav;
    }
}

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<h1>首页</h1>
<a th:href="@{/testModelAndView}">通过ModelAndView向request域对象共享数据</a>
</body>
</html>

使用Model向request域对象共享数据

package com.qcby.mvc.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;

@Controller
public class ScopeController {

    @RequestMapping("/testModel")
    public String testModel(Model model){
        model.addAttribute("testRequestScope","hello,Model");
        return "success";
    }
}

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<h1>首页</h1>
<a th:href="@{/testModel}">通过Model向request域对象共享数据</a>
</body>
</html>

使用map向request域对象共享数据

package com.qcby.mvc.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import java.util.Map;

@Controller
public class ScopeController {

    @RequestMapping("/testMap")
    public String testMap(Map<String,Object> map){
        map.put("testRequestScope","hello,map");
        return "success";
    }
}

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<h1>首页</h1>
<a th:href="@{/testMap}">通过Map向request域对象共享数据</a>
</body>
</html>

使用ModelMap向request域对象共享数据

package com.qcby.mvc.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import java.util.Map;

@Controller
public class ScopeController {

    @RequestMapping("/testModelMap")
    public String testModelMap(ModelMap modelMap){
        modelMap.addAttribute("testRequestScope","hello,ModelMap");
        return "success";
    }
}

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<h1>首页</h1>
<a th:href="@{/testModelMap}">通过ModelMap向request域对象共享数据</a>
</body>
</html>

Model、ModelMap、Map的关系

Model、ModelMap、Map类型的参数其实本质上都是 BindingAwareModelMap 类型的

public interface Model{}
public class ModelMap extends LinkedHashMap<String, Object> {}
public class ExtendedModelMap extends ModelMap implements Model {}
public class BindingAwareModelMap extends ExtendedModelMap {}

向session域共享数据

package com.qcby.mvc.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import java.util.Map;

@Controller
public class ScopeController {

    @RequestMapping("/testSession")
    public String testSession(HttpSession session){
        session.setAttribute("testSessionScope","hello,session");
        return "success";
    }
}

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<h1>首页</h1>
<a th:href="@{/testSession}">通过ServletAPI向session域对象共享数据</a>
</body>
</html>
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
success<br>
<p th:text="${session.testSessionScope}"></p>
</body>
</html>

 

向application域共享数据

package com.qcby.mvc.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import java.util.Map;

@Controller
public class ScopeController {

    @RequestMapping("/testApplicationScope")
    public String testApplicationScope(HttpSession session){
        ServletContext application = session.getServletContext();
        application.setAttribute("testApplicationScope","hello,application");
        return "success";
    }
}

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<h1>首页</h1>
<a th:href="@{/testApplicationScope}">通过ServletAPI向application域对象共享数据</a>
</body>
</html>
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
success<br>
<p th:text="${application.testApplicationScope}"></p>
</body>
</html>


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