1、使用原生ServletAPI向request域对象共享数据;
2、使用ModelAndView向request域共享数据;
3、使用Model向request域共享数据;
4、使用map向request域对象共享数据;
5、使用ModelMap向request域对象共享数据。
其实所有的方法,底层都是封装成ModelAndView。
1、原生API不做赘述,如果非要使用,那就是在侮辱SpringMVC了(hhh)
2、使用ModelAndView向request域共享数据;
文档结构:
web.xml(万年不变):
<?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> //配置springMVC的前端控制器DispatcherServlet <servlet> <servlet-name>DispatcherServlet</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>DispatcherServlet</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app>
springMVC.xml(万年不变):
<?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"> <!-- 开启组件扫描--> <context:component-scan base-package="demo.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 th:href="@{/index}">首页</h1> <a th:href="@{/testModelAndView}">测试ModelAndView</a> </body> </html>
success.html:
使用${}获取变量的值
<!DOCTYPE html> <html lang="en" xmlns:th="http://www.thymeleaf.org"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> success <p th:text="${testRequestScope}"></p> </body> </html>
需要注意的是:p标签中不能直接将thymeleaf的@{}写在文本里,这样会被当做文本来解析,所以需要写在text属性中,并用th指明是thymeleaf语法
TestController.java:
package demo.controller; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.servlet.ModelAndView; @Controller public class TestController { @RequestMapping(value = "/") public String index(){ return "index"; } @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 modelAndView = new ModelAndView(); //处理模型数据,即向请求域request共享数据 modelAndView.addObject("testRequestScope","hello"); //设置视图名称 modelAndView.setViewName("success"); return modelAndView; } }
运行一下:
点击 测试ModelAndView:
获取到了传递过来的值。
3、使用Model向request域共享数据;
其实Model相当于ModelAndView的一部分功能,就简单地贴个代码,不多介绍了
@RequestMapping("/testModel") public String testModel(Model model){ model.addAttribute("testModel","hello"); return "success"; }
测试一下:
4、使用map向request域对象共享数据;
写法跟上面两个基本相同
@RequestMapping(value = "/testMap") public String testMap(Map<String,Object>map){ map.put("testMap","hello"); return "success"; }
测试一下:
5、使用ModelMap向request域对象共享数据。
@RequestMapping(value = "testModelMap") public String testModelMap(ModelMap modelMap){ modelMap.addAttribute("testModelMap","hello"); return "success"; }
除了原生Servlet之外,剩下四种方法任选一种使用就行,当然如果执意要用原生servlet也可以。