设置SpringMVC默认首页启动

//控制前台页面的控制器
@Controller
@RequestMapping("/front")
public class FrontController {

//从这里去首页;所有的操作都是从控制器出去的;

@RequestMapping("/index")
  public ModelAndView index(){
    //模型视图对象，里面可以存放数据到model，还可以存放视图信息到view
    ModelAndView mv=new ModelAndView();
    List<Category> cateList=cateService.search();
    mv.addObject("cateList",cateList);
    //shopList:所有商品信息;把查询的所有数据，给谁了？
    //<泛型>:就是用来指定List集合里面具体的类型；因为List它里面可以放任意类型，现在给它指定一个Shop（商品）类型
    List<Shop>shopList=shopService.search();
    mv.addObject("shopList",shopList); //数据在shopList，存放到model,一个变量叫shopList
    mv.setViewName("../../index");//../表示上一级;注意系统默认解析路径是WEB/INF/jsp/
    return mv;
  }

<servlet>
    <servlet-name>springmvc</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>/WEB-INF/spring-config.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>springmvc</servlet-name>
    <url-pattern>/front/index</url-pattern>
  </servlet-mapping>

<welcome-file-list>
    <welcome-file>front/index</welcome-file>
  </welcome-file-list>