Springboot整合pagehelper分页功能

<dependency>
   <groupId>com.github.pagehelper</groupId>
   <artifactId>pagehelper-spring-boot-starter</artifactId>
      <version>1.2.2</version>
</dependency>

@RequestMapping(value = "getApps.do")
public String getApps(Apps apps) {
  PageHelper.startPage(apps.getPageNum(), apps.getPageSize());
  ArrayList<Apps> appsList = appsService.getApps(apps);
  PageInfo<Apps> appsPageInfo = new PageInfo<>(appsList);
  return JSON.toJSONString(appsPageInfo);
}

PageHelper.startPage(apps.getPageNum(), apps.getPageSize());
ArrayList<Apps> appsList = appsService.getApps(apps);

PageInfo<T> appsPageInfo = new PageInfo<>(appsList);