利用Java如何实现前台与后台页面分页

<%@ page language="java" contentType="text/html; charset=utf-8"
 pageEncoding="utf-8"%>
<%@taglib prefix="s" uri="/struts-tags"%>  



  
  



    
    

    
     
需求列表
     
     

      

       
        
         筛选：按
         
          最新
          价格降序
          
         
         

       
      
     
     
    
      
      
      
      

      

       

        

         
${title}
        
                         
       
       

        
      
         
悬赏积分：${price}
         
需求描述：${requirementDescription}
        
    
       
       
  
      

      
     
     

      

     
      


     
     




 

 //查询需求列表
 public String queryRequirListByPage(){
  int pageSize=5;//每页记录
  String hql="select r from Requirement r where r.reStatus !=2 ";
  if(sortValue == null || sortValue.length() <= 0){
   hql=hql+"order by r.publishDatetime desc";
   ActionContext.getContext().put("sortValue", "publishDatetime"); //当前页码条件
   session.put("sessionReqSortValue","publishDatetime");
  }else{
  hql=hql+"order by r."+sortValue+" desc";
   ActionContext.getContext().put("sortValue", sortValue); //当前页码条件
   session.put("sessionReqSortValue",sortValue);
  }
  long icount=requirementService.countAllRe();//总记录数
  long allPage;//总页数
  //判断是否能整除，能则直接，不能则+1；
  if((icount%pageSize)==0){
   allPage=icount/pageSize;
  }
  else{
   allPage=(icount/pageSize)+1;
  }
  System.out.println("总记录："+icount+"；总页数："+allPage+"；当前页码："+pageNo);
  List requiList=requirementService.queryByPage(hql, pageNo, pageSize);
  ActionContext.getContext().put("requiList", requiList);//需求列表
  ActionContext.getContext().put("icount", icount);//总记录数
  ActionContext.getContext().put("allPage", allPage);//总页数
  ActionContext.getContext().put("currentPage", pageNo); //当前页码
  session.put("sessionCurrentPage", pageNo);
  return "requireContent";

 }

  public long countAllRe() {
  return requirementDao.countAllRe();
 }
  public List queryByPage(String hql, int pageNo, int pageSize) {
  return requirementDao.queryByPage(hql, pageNo, pageSize);
 }

 //这里可能会报错，就是直接查询数据列表（使用了SSH）
 public long countAll() {
  List<?> l = getSession().createQuery("select count(*) from "
    + clazz.getSimpleName()).list();
  if (l != null && l.size() == 1 )
  {
   return (Long)l.get(0);
  }
  return 0;
 }
 public List queryByPage(String hql, int pageNo, int pageSize) {
  return getSession()
    .createQuery(hql)
    .setFirstResult((pageNo - 1) * pageSize)
    .setMaxResults(pageSize)
    .list();
 }