idea maven +spring mvc

<dependency>
   <groupId>junitgroupId>
   <artifactId>junitartifactId>
   <version>4.12version>
   <scope>testscope>
dependency>
<dependency>
   <groupId>org.slf4jgroupId>
   <artifactId>slf4j-log4j12artifactId>
   <version>1.7.21version>
dependency>
<dependency>
   <groupId>javax.servletgroupId>
   <artifactId>javax.servlet-apiartifactId>
   <version>3.1.0version>
dependency>
<dependency>
   <groupId>javax.servlet.jspgroupId>
   <artifactId>jsp-apiartifactId>
   <version>2.2version>
dependency>
<dependency>
   <groupId>javax.servletgroupId>
   <artifactId>jstlartifactId>
   <version>1.2version>
dependency>
<dependency>
   <groupId>mysqlgroupId>
   <artifactId>mysql-connector-javaartifactId>
   <version>5.1.35version>
dependency>
<dependency>
   <groupId>org.springframeworkgroupId>
   <artifactId>spring-webartifactId>
   <version>4.2.6.RELEASEversion>
dependency>
<dependency>
   <groupId>org.springframeworkgroupId>
   <artifactId>spring-webmvcartifactId>
   <version>4.2.6.RELEASEversion>
dependency>
<dependency>
   <groupId>org.springframeworkgroupId>
   <artifactId>spring-contextartifactId>
   <version>4.2.6.RELEASEversion>
dependency>
<dependency>
   <groupId>org.springframeworkgroupId>
   <artifactId>spring-testartifactId>
   <version>4.2.6.RELEASEversion>
dependency>
<dependency>
   <groupId>org.springframeworkgroupId>
   <artifactId>spring-jdbcartifactId>
   <version>4.2.6.RELEASEversion>
dependency>
<dependency>
   <groupId>com.github.stefanbirknergroupId>
   <artifactId>system-rulesartifactId>
   <version>1.16.1version>
   <scope>testscope>
dependency>
<dependency>
   <groupId>org.aspectjgroupId>
   <artifactId>aspectjweaverartifactId>
   <version>1.8.9version>
dependency>
<dependency>
   <groupId>org.apache.commonsgroupId>
   <artifactId>commons-lang3artifactId>
   <version>3.4version>
dependency>
<dependency>
   <groupId>commons-fileuploadgroupId>
   <artifactId>commons-fileuploadartifactId>
   <version>1.3.1version>
dependency>

DOCTYPE web-app PUBLIC
        "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
        "http://java.sun.com/dtd/web-app_2_3.dtd" >
<web-app>
   <display-name>Archetype Created Web Applicationdisplay-name>
   <servlet>
       <servlet-name>springmvc-servletservlet-name>
       <servlet-class>org.springframework.web.servlet.DispatcherServletservlet-class>
       <init-param>
           <param-name>contextConfigLocationparam-name>
           <param-value>classpath:springMVC-context.xmlparam-value>
       init-param>
       <load-on-startup>1load-on-startup>
   servlet>
   <servlet-mapping>
       <servlet-name>springmvc-servletservlet-name>
       <url-pattern>/url-pattern>
   servlet-mapping>
web-app>

@RequestMapping("/test")
@Controller
public class TestController {
   private static final Logger logger = LoggerFactory.getLogger(TestController.class);
    @RequestMapping("/index.ajax")
    @ResponseBody
   public String index() {
       return "hello world";
    }
}
7.springmvc-context.xml
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"
       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">
   <context:component-scan base-package="com.xq.demo.controller"/>
beans>