首先配置注解扫描（该包扫描必须放在springmvc配置文件中，如果放在spring配置文件中，则扫描不到）

    <context:component-scan base-package="com.test.controller"/>

<?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
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd">
    <context:component-scan base-package="com.test"/>
    <!--注解驱动，相当于配置HandlerMapping及HandlerAdapter-->
    <mvc:annotation-driven></mvc:annotation-driven>
    <!--放行静态资源-->
    <!--一个*表示该文件夹下的所有子文件，**表示该文件夹的所有子文件及子文件夹下的内容-->
    <!--location表示文件资源所在路径，mapping表示请求路径-->
    <mvc:resources mapping="/js/**" location="/WEB-INF/js/"/>
    <mvc:resources mapping="/css/**" location="/WEB-INF/css/"/>
    <mvc:resources mapping="/images/**" location="/WEB-INF/images/"/>
</beans>

controller类：

package com.test.controller;

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

@Controller
public class DemoController {
    // String表示跳转到哪个页面
    @RequestMapping("demo")
    public String demo() {
        return "main.jsp";
    }
}