SpringMVC之Controller简单使用

//环境 spring-4.3.18/JDK1.8/开发工具/IntelliJ IDEA 2018.2.5 x64

//工程结构图

//web.xml

 <?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Spring IoC配置文件路径-->
     <context-param>
         <param-name>contextConfigLocation</param-name>
         <param-value>/WEB-INF/applicationContext.xml,/WEB-INF/dispatcher-servlet.xml</param-value>
     </context-param>
     <!--初始化Spring IoC容器-->
     <listener>
         <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
     </listener>
     <!--Spring MVC会根据servlet-name配置，找到/WEB-INF/dispatcher-servlet.xml作为配置文件载入web工程-->
     <servlet>
         <servlet-name>dispatcher</servlet-name>
         <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
         <!--配置Spring IoC配置文件路径-->
         <!--<init-param>
             <param-name>contextConfigLocation</param-name>
             <param-value>/WEB-INF/applicationContext.xml,/WEB-INF/dispatcher-servlet.xml</param-value>
         </init-param>-->
         <load-on-startup>1</load-on-startup>
     </servlet>
     <!--Controller-Servlet拦截配置-->
     <servlet-mapping>
         <servlet-name>dispatcher</servlet-name>
         <url-pattern>/</url-pattern>
     </servlet-mapping>
 </web-app>

//applicationContext.xml    该文件可省略，同时将

<!--配置Spring IoC配置文件路径-->
 7     <context-param>
 8         <param-name>contextConfigLocation</param-name>
 9         <param-value>/WEB-INF/applicationContext.xml,/WEB-INF/dispatcher-servlet.xml</param-value>
10     </context-param>

改成

<!--配置Spring IoC配置文件路径-->
 7     <context-param>
 8         <param-name>contextConfigLocation</param-name>
 9         <param-value>/WEB-INF/dispatcher-servlet.xml</param-value>
10     </context-param>

 <?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:mvc="http://www.springframework.org/schema/mvc"
        xmlns:context="http://www.springframework.org/schema/context"
        xmlns:aop="http://www.springframework.org/schema/aop"
        xmlns:tx="http://www.springframework.org/schema/tx"
        xsi:schemaLocation="http://www.springframework.org/schema/beans
         http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
         http://www.springframework.org/schema/mvc
         http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd
         http://www.springframework.org/schema/context
         http://www.springframework.org/schema/context/spring-context.xsd
         http://www.springframework.org/schema/aop
         http://www.springframework.org/schema/aop/spring-aop-4.2.xsd
         http://www.springframework.org/schema/tx
         http://www.springframework.org/schema/tx/spring-tx.xsd">

 </beans>

//dispatcher-servlet.xml    下面部分声明可省略

 <?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:mvc="http://www.springframework.org/schema/mvc"
        xmlns:context="http://www.springframework.org/schema/context"
        xmlns:aop="http://www.springframework.org/schema/aop"
        xmlns:tx="http://www.springframework.org/schema/tx"
        xsi:schemaLocation="http://www.springframework.org/schema/beans
         http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
         http://www.springframework.org/schema/mvc
         http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd
         http://www.springframework.org/schema/context
         http://www.springframework.org/schema/context/spring-context.xsd
         http://www.springframework.org/schema/aop
         http://www.springframework.org/schema/aop/spring-aop-4.2.xsd
         http://www.springframework.org/schema/tx
         http://www.springframework.org/schema/tx/spring-tx.xsd">

     <!--使用注解驱动-->
     <mvc:annotation-driven></mvc:annotation-driven>
     <!--<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"></bean>
     <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"></bean>-->
     <!--扫描装载的包-->
     <context:component-scan base-package="com.jhc.controller"></context:component-scan>
     <!--定义视图解析器-->
     <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"></bean>

 </beans>

//index.jsp

 <%--
   Created by IntelliJ IDEA.
   User: JHC
   Date: 2018/11/30
   Time: 17:31
   To change this template use File | Settings | File Templates.
 --%>
 <%@ page contentType="text/html;charset=UTF-8" language="java" %>
 <html>
   <head>
     <title>Hello Word</title>
   </head>
   <body>
   Say:${hello}<br>
   </body>
 </html>

//HelloController.java

 package com.jhc.controller;

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

 @Controller
 public class HelloController {

     @RequestMapping(value = "/hello")
     public ModelAndView sayHello(){
         System.out.println("Hello Word");
         ModelAndView modelAndView=new ModelAndView();
         modelAndView.addObject("hello","Hello Word");
         modelAndView.setViewName("/index.jsp");
         return modelAndView;
     }
 }