SpringMvc—域对象共享数据和视图

一、向request域创建对象

先创建首页：

在testController这个类中：

package com.pon.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class testController {@RequestMapping("/")public String index(){return "index";}
}

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>

1.使用servletAPI向request域对象共享数据

在scopeController这个类中：

package com.pon.controller;
import jakarta.servlet.http.HttpServletRequest;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class scopeController {
@RequestMapping("/scope")public String Scope(HttpServletRequest request){request.setAttribute("GetscopeObject","Hello Servlret");return "success";}
}

在success.html中：

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

在首页中要跳转到success界面，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="@{/scope}">Servlet API域对象共享</a>
</body>
</html>

2.使用ModelAndView向request域对象共享数据

在scopeController中：

@Controller
public class scopeController {
@RequestMapping("/mv")public ModelAndView testmv(){ModelAndView mav=new ModelAndView();//向请求域request共享数据mav.addObject("GetscopeObject","Hello ModelandView");//设置视图名称mav.setViewName("success");return mav;}
}

在success.html中：

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

3.使用Model向request域对象共享数据

在scopeController中：

@Controller
public class scopeController {@RequestMapping("/m")public String testModel(Model model){model.addAttribute("GetscopeObject","hello model");return "success";}
}

success.html：

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

4.使用Map向request域对象共享数据

在scopeController中：

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

5.使用ModelMap向request域对象共享数据

在scopeController中：

@Controller
public class scopeController {@RequestMapping("/modelmap")public String testMM(ModelMap modelMap){modelMap.addAttribute("GetscopeObject","hello ModelMap");return "success";}
}

6.Model、ModelMap、Map三者之间的关系

二、向session域共享数据

在scopeController中：

@Controller
public class scopeController {@RequestMapping("/testsession")public String testMM(HttpSession session){session.setAttribute("testSession","hello session");return "success";}
}

在success.html：

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

三、向application域共享数据

在scopeController中：

@Controller
public class scopeController {@RequestMapping("/application")public String testap(HttpSession session){ServletContext application= session.getServletContext();application.setAttribute("testapplication","hello,servletcontext=application");return "success";}
}

success.html：

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

四、SpringMvc的视图

1.ThymeleafView

在viewController类中：

package com.pon.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class viewController {@RequestMapping("/view")public String view(){return "view";}//超链接的路径@RequestMapping("/testview")public String testview(){return "hi";}
}

view.html：

<!DOCTYPE html>
<html lang="en"xmlns:th="http://www.thymeleaf.org">
<head><meta charset="UTF-8"><title>Title</title>
</head>
<body>
<a th:href="@{/testview}">ThyleleafView</a>
</body>
</html>

hi.html：

<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>Title</title>
</head>
<body>
你好
</body>
</html>

2.转发视图

在viewController类中：

package com.pon.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class viewController {@RequestMapping("/view")public String view(){return "view";}@RequestMapping("/testview")public String testview(){return "hi";}@RequestMapping("/testforword")public String testfoeword(){return "forward:/testview";}
}

view.html：

<!DOCTYPE html>
<html lang="en"xmlns:th="http://www.thymeleaf.org">
<head><meta charset="UTF-8"><title>Title</title>
</head>
<body>
<a th:href="@{/testview}">ThyleleafView</a>
<a th:href="@{/testforword}">转发视图</a>
</body>
</html>

hi.html:

<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>Title</title>
</head>
<body>
你好
</body>
</html>

3.重定向视图

在viewController类中：

@Controller
public class viewController {@RequestMapping("/view")public String view(){return "view";}@RequestMapping("/testview")public String testview(){return "hi";}@RequestMapping("/testforword")public String testfoeword(){return "forward:/testview";}@RequestMapping("/testredirect")public String testRedirect(){return "redirect:/testview";}
}

view.html：

<!DOCTYPE html>
<html lang="en"xmlns:th="http://www.thymeleaf.org">
<head><meta charset="UTF-8"><title>Title</title>
</head>
<body>
<a th:href="@{/testview}">ThyleleafView</a>
<a th:href="@{/testforword}">转发视图</a>
<a th:href="@{/testredirect}">重定向视图</a>
</body>
</html>