SpringMVC使用注解开发

准备工作，创建一个moudle，添加框架支持web
创建lib

1.web.xml配置dispartcherservlet

<?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dispartcherservlet；这个是springmvc的核心，；请求分发器；前端控制器-->
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!--dispartcherservlet要绑定一个spring的配置文件-->
        <!--配置文件的名字最好同servlet-name相同-->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springmvc-servlet.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <!--/*和/的区别-->
    <!--/只会去匹配所有的请求，不会去匹配jsp页面-->
    <!--/*会匹配所有的请求，也会匹配相应的jsp页面，但是会写一个视图解析器，页面路径就会变成a.jsp.jsps-->
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

</web-app>

2.创建sparingmvc-servlet.xml
扫描包，让包下的注解生效
让springmvc不处理静态资源
支持注解驱动
视图解析器

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

    <context:component-scan base-package="com.superman.controller"/>
    <!--让springmvc不处理静态资源-->
    <mvc:default-servlet-handler/>
    <!--支持mvc注解驱动-->
    <mvc:annotation-driven/>

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
</beans>

3.创建controller控制器

@Controller
public class HelloController{
    @RequestMapping("/abc")
    public String hello(Model model){
        model.addAttribute("msg","hello");
        return "hello";
    }
}