Spring MVC应用结构

╰+哭是因爲堅強的太久メ 2021-07-24 15:13 384阅读 0赞

**一 项目结构**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70][]

**二 Spring的支持**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 1][]

**三 配置前端控制器**

<?xml version="1.0" encoding="UTF-8"?>
    <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
         http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         id="WebApp_ID" version="3.1">
         
      <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>
            org.springframework.web.servlet.DispatcherServlet
        </servlet-class>
        <init-param>
          <param-name>contextConfigLocation</param-name>
          <param-value>/WEB-INF/springmvc-config.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
      </servlet>
      
      <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
      </servlet-mapping>
    </web-app>

**四 配置Spring MVC的Controller**

package org.fkit.controller;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import org.springframework.web.servlet.ModelAndView;
    import org.springframework.web.servlet.mvc.Controller;
    
    public class HelloController implements Controller{
          
          /**
           * handleRequest是Controller接口必须实现的方法。
           * 该方法的参数是对应请求的HttpServletRequest和HttpServletResponse。
           * 该方法必须返回一个包含视图路径或视图路径和模型的ModelAndView对象。
           * */
         @Override
         public ModelAndView handleRequest(HttpServletRequest  request,
                    HttpServletResponse response) throws Exception {
                System.out.println("handleRequest 被调用");
                // 创建准备返回的ModelAndView对象，该对象通常包含了返回视图的路径、模型的名称以及模型对象
                ModelAndView mv = new ModelAndView();
                // 添加模型数据 可以是任意的POJO对象  
              mv.addObject("message", "Hello World!");  
              // 设置逻辑视图名，视图解析器会根据该名字解析到具体的视图页面  
              mv.setViewName("/WEB-INF/content/welcome.jsp");
               // 返回ModelAndView对象。
               return mv;
         }
    }

**五 Controller类的实现**

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://www.springframework.org/schema/beans
             http://www.springframework.org/schema/beans/spring-beans.xsd">
           
        
        <bean name="/hello"  class="org.fkit.controller.HelloController"/>
         
         <bean  class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"/>
         
         <bean  class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"/>
         
         
         <bean  class="org.springframework.web.servlet.view.InternalResourceViewResolver"/>
    </beans>

**六 View页面**

<%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"  "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html;  charset=UTF-8">
    <title>欢迎页面</title>
    </head>
    <body>
    
    ${requestScope.message}
    </body>
    </html>

**七 测试应用**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 2][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70]: /images/20210724/45cd334533184eb6b287a78271fc24e6.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 1]: /images/20210724/c54d3f837de24795b96a5efc3d9635af.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 2]: /images/20210724/e5393be5840d4f00ad01444fe573bba7.png