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Domain objects share data

2022-08-07 14:05:00 【piggy.get】

一、使用ServletAPI向request域对象共享数据（不常用）

二、使用ModelAndView向request域对象共享数据

ModuleAndView包含Module和View的功能

三、使用Model向request域对象共享数据

四、使用map向request域对象共享数据

五、使用ModelMap向request域对象共享数据

六、Model、ModelMap、Map的关系

七、向session域共享数据

八、向application域共享数据

一、使用ServletAPI向request域对象共享数据（不常用）

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

二、使用ModelAndView向request域对象共享数据

<a th:href="@{/test/mav}">测试通过ModelAndView向请求域共享数据</a>

ModuleAndView包含Module和View的功能
Module：向请求域中共享数据
View：设计逻辑视图,实现页面跳转
使用ModuleAndView时,可以使用其ModuleFunctions share data with the requesting domain
使用ViewFunctional Settings Logical View,But the controller method must beModuleAndView作为方法的返回值

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>首页</title>
</head>
    <body>
         <h1>success.html</h1>
         <p th:text="${testRequestScope}"></p>
    </body>
</html>

package com.atguigu.controller;

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

@Controller
public class TestScopeController {
    @RequestMapping("/test/mav")
    public ModelAndView testMAV(){
        ModelAndView mav = new ModelAndView();
        //向请求域中共享数据
        mav.addObject("testRequestScope","hello,ModuleAndView");
        //设置逻辑视图
        mav.setViewName("success");
        return mav;
    }
}

三、使用Model向request域对象共享数据

<a th:href="@{/test/model}">测试通过Model向请求域共享数据</a>

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

四、使用map向request域对象共享数据

<a th:href="@{/test/map}">测试通过Map向请求域共享数据</a><br>

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

五、使用ModelMap向request域对象共享数据

<a th:href="@{/test/modelMap}">测试通过ModelMap向请求域共享数据</a><br>

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

六、Model、ModelMap、Map的关系

Model、ModelMap、MapType parameters are essentially all BindingAwareModelMap 创建的

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

七、向session域共享数据

Only if the browser is closed or not,It doesn't matter if the server is down or not

<a th:href="@{/test/session}">Tests share data to the session domain</a><br>

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>首页</title>
</head>
    <body>
         <h1>success.html</h1>
         <p th:text="${testRequestScope}"></p>
         <p th:text="${session.testSessionScope}"></p>
         <p th:text="${application.testApplicationScope}"></p>
    </body>
</html>

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

八、向application域共享数据

<a th:href="@{/test/application}">Tests share data with the app domain</a><br>

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