在Spring Boot中使用Controller实现控制页面

package com.example.controller;import java.util.Date;import java.util.Map;import org.springframework.beans.factory.annotation.Value;import org.springframework.stereotype.Controller;import org.springframework.ui.Model;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.servlet.ModelAndView;@Controller@RequestMapping("/action")public class ActionController {  // 从 application.properties 中读取配置，如取不到application.properties定义的值，则取默认值为Hello Shanhy  @Value("${application.hello:Hello Shanhy}")  private String hello;    @RequestMapping(value = {"/","/index"})  public String index(Map<String, Object> model){    // 直接返回字符串，框架默认会去 spring.view.prefix 目录下的 （index拼接spring.view.suffix）页面    // 本例为 /WEB-INF/jsp/index.jsp    model.put("time", new Date());    model.put("message", this.hello);    return "index";  }    @RequestMapping("/page1")  public ModelAndView page1(){    // 页面位置 /WEB-INF/jsp/page/page1.jsp    //page/page1:页面路径地址/页面名称    ModelAndView mav = new ModelAndView("page/page1");    mav.addObject("content", hello);    return mav;  }    @RequestMapping("/page2")  public String page2(Model model){    // 页面位置 /WEB-INF/jsp/page/page1.jsp    model.addAttribute("content", hello + "（第二种）");    return "page/page1";  }}