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SpringMVC5-域对象共享数据

2024/10/24 15:13:06 来源：https://blog.csdn.net/m0_73902080/article/details/142571493  浏览:  次   关键词：SpringMVC5-域对象共享数据

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,ServletAPIrequest.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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