SpringMVC環境搭建之Idea

SpringMVC
一.. SpringMVC重要組件介紹
    1. DispacherServlet：前端控制器，接收所有請求，(如果配置/不包含jsp)
    2. HandlerMapping：解析請求格式，判斷希望要執行哪個方法
    3. HandlerAdapter：負責調用具體的方法
    4. ViewResovler：視圖解析器，解析結果，準備跳轉的具體的視圖

spring的jar包官方下載地址：

https://repo.spring.io/libs-release-local/org/springframework/spring/
二.  環境搭建
    1.導入jar包
    2.在web.xml中配置前端控制器，若不配置<init-param>，會去/web-inf/<servlet-name>servlet.xml找
<servlet>
<servlet-name>qq</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>qq</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
  3.src下麵新建springmvc.xml
   3.1.引入命名空間
<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"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd

http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd">

<!--掃描註解-->
<context:component-scan base-package="com.bj.controller"></context:component-scan>
<!--註解驅動-->
<mvc:annotation-driven></mvc:annotation-driven>
<!--放行靜態資源兩個*號表示文件夾下所有文件-->
<mvc:resources mapping="/js/**" location="/js/"></mvc:resources>
<mvc:resources mapping="/css/**" location="/css/"></mvc:resources>
<mvc:resources mapping="/imgs/**" location="/imgs/"></mvc:resources>
</beans>
3.2.編寫控制器類

1 @Controller
2 public class Democontroller {
3 @RequestMapping("demo")
4      public String demo(){
5         return "main.jsp";
6     }
7 
8 }