域对象共享数据
域对象共享数据
用户9615083
发布于 2022-12-25 13:54:05
发布于 2022-12-25 13:54:05
代码可运行
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代码可运行
# 域对象共享数据
- 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
# 使用ServletAPI向request域对象共享数据
@RequestMapping("/testServletAPI")
public String testServletAPI(HttpServletRequest request){
request.setAttribute("testScope", "hello,servletAPI");
return "success";
}# 使用ModelAndView向request域对象共享数据
@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();
//向请求域共享数据
mav.addObject("testScope", "hello,ModelAndView");
//设置视图，实现页面跳转
mav.setViewName("success");
return mav;
}# 使用Model向request域对象共享数据
@RequestMapping("/testModel")
public String testModel(Model model){
model.addAttribute("testScope", "hello,Model");
return "success";
}# 使用map向request域对象共享数据
@RequestMapping("/testMap")
public String testMap(Map<String, Object> map){
map.put("testScope", "hello,Map");
return "success";
}# 使用ModelMap向request域对象共享数据
@RequestMapping("/testModelMap")
public String testModelMap(ModelMap modelMap){
modelMap.addAttribute("testScope", "hello,ModelMap");
return "success";
}# 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{} //接口
public class ModelMap extends LinkedHashMap<String, Object> {}
public class ExtendedModelMap extends ModelMap implements Model {}
public class BindingAwareModelMap extends ExtendedModelMap {}//本质# 向session域共享数据
@RequestMapping("/testApplication")
public String testApplication(HttpSession session){
ServletContext application = session.getServletContext();
application.setAttribute("testApplicationScope", "hello,application");
return "success";
}# 向application域共享数据
@RequestMapping("/testApplication")
public String testApplication(HttpSession session){
ServletContext application = session.getServletContext();
application.setAttribute("testApplicationScope", "hello,application");
return "success";
}Click to view the code writen by author
/**
* @author frx
* @version 1.0
* @date 2022/1/18 13:45
*/
@Controller
public class TestController {
@RequestMapping("/")
public String index(){
return "index";
}
}/**
* @author frx
* @version 1.0
* @date 2022/1/18 14:42
*/
@Controller
public class ScopeController {
//使用servletAPI向request域对象共享数据
@RequestMapping("/testRequestByservletAPI")
public String testRequestByServletAPI(HttpServletRequest request){
request.setAttribute("testRequestScope","helloServletAPI");
return "success";
}
@RequestMapping("/testModelAndView")
public ModelAndView testModeAndView(){
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;
}
@RequestMapping("/testModel")
public String testModel(Model model){
model.addAttribute("testRequestScope","hello,model");
return "success";
}
@RequestMapping("/testMap")
public String testMap(Map<String,Object> map){
map.put("testRequestScope","hello,map");
return "success";
}
@RequestMapping("/testModelMap")
public String testModeMap(ModelMap modelMap){
modelMap.addAttribute("testRequestScope","hello,ModelMap");
return "success";
}
@RequestMapping("/testSession")
public String testSession(HttpSession session){
session.setAttribute("testSessionScope","Hello,Session");
return "success";
}
@RequestMapping("/testApplication")
public String testApplication(HttpSession session){
ServletContext application = session.getServletContext();
application.setAttribute("testSessionScope","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>
success<br>
<p th:text="${testRequestScope}"></p>
<p th:text="${session.testSessionScope}"></p>
</body>
</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><br>
<a th:href="@{/testModelAndView}">通过ModelAndView向request域对象共享数据</a><br>
<a th:href="@{/testModel}">通过Model向request域对象共享数据</a><br>
<a th:href="@{/testMap}">通过Map向request域对象共享数据</a><br>
<a th:href="@{/testModelMap}">通过ModelMap向request域对象共享数据</a><br>
<a th:href="@{/testSession}">通过ServletAPI向Session域对象共享数据</a><br>
<a th:href="@{/testApplication}">通过Application向Session域对象共享数据</a><br>
</body>
</html>本文参与 腾讯云自媒体同步曝光计划，分享自作者个人站点/博客。
原始发表：2022-01-18，如有侵权请联系 cloudcommunity@tencent.com 删除
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