SSH 分页方法一，基于struts2

SSH分页查询留言记录

 

Dao层：

/**
  * 分页查询全部留言
  */
 public List<Ly> getMessageByPaging(int currentPage,int pageSize){
  Session session=this.getHibernateTemplate().getSessionFactory().openSession();
  Query query=session.createQuery("from Ly ");
  int startRow=(currentPage-1)*pageSize;
  query.setFirstResult(startRow); 
  query.setMaxResults(pageSize);
  List<Ly> message=query.list();
  session.close();
  return message;

 }
 
 /**
  * 得到留言总数
  */
 public int getTotle(){
  List<Ly> message=this.getHibernateTemplate().find("from Ly");
  return message.size();
 }
 
 /**
  * 分页查询指定课程留言
  */
 public List<Ly> getMessageByCoursePaging(int courseId,int currentPage,int pageSize){
  Session session=this.getHibernateTemplate().getSessionFactory().openSession();
  Query query=session.createQuery("from Ly as a where a.kcId.id=?");
  query.setParameter(0, courseId);
  int startRow=(currentPage-1)*pageSize;
  query.setFirstResult(startRow); 
  query.setMaxResults(pageSize);
  List<Ly> message=query.list();
  session.close();
  return message;
 }
 
 /**
  * 获取指定课程留言总数
  */
 public int getTotleByCourse(int courseId){
  List<Ly> mesByCourse = this.getHibernateTemplate().find("from Ly as a where a.kcId.id=?",courseId);
  return mesByCourse.size();
 }

 

Service层：

/**
  * 分页查询
  */
 public List<Ly> getMessageByPaging(int currentPage,int pageSize){
  return lyDao.getMessageByPaging(currentPage, pageSize);
 }
 
 /**
  * 得到留言总数
  */
 public int getTotal(){
  return lyDao.getTotle();
 }
 
 /**
  * 分页查询指定课程留言
  */
 public List<Ly> getMesByCoursePaging(int courseId,int currentPage,int pageSize){
  return lyDao.getMessageByCoursePaging(courseId, currentPage, pageSize);
 }
 
 /**
  * 得到指定课程留言总数
  */
 public int getTotalByCourse(int courseId){
  return lyDao.getTotleByCourse(courseId);
 }

 

Action层：

 private int currentPage;
 private int totalPage;
 private int totalSize;
 private int pageSize = 10;

 

/**
  * 获得全部留言分页实现
  * @return
  */
 public String browsePaging() { 
  if(currentPage==0){
   currentPage = 1;
  }
  totalSize=messageService.getTotal();
  
  int mod = totalSize%pageSize;
   if(mod==0){
    totalPage = totalSize/pageSize;
   }else 
    totalPage = totalSize/pageSize+1;
   
    setGetMessage(messageService.getMessageByPaging(currentPage, pageSize));
    return "success";
  } 

 

/**
  * 保存留言后分页实现
  */
 public String saveMessagePaging(){
  if(currentPage==0){
   currentPage = 1;
  }
  totalSize=messageService.getTotalByCourse(courseId);
  
  int mod = totalSize%pageSize;
  if(mod==0){
   totalPage = totalSize/pageSize;
  }else 
   totalPage = totalSize/pageSize+1;
   
    setGetMessage(messageService.getMesByCoursePaging(courseId, currentPage, pageSize));
    return "success";
 }

 

 

 

JSP页面：

<!--全部留言-->

<center>当前是第${currentPage}页,共有${totalPage}页
 <a href="browsePaging.action?currentPage=1" >首页</a>
 <s:if test="%{currentPage>1}"><a href="browsePaging.action?currentPage=${currentPage-1}" >上一页</a>
 <a href="browsePaging.action?currentPage=${currentPage-1}" >${currentPage-1}</a></s:if>
 <a href="browsePaging.action?currentPage=${currentPage}" >${currentPage}</a>
 <s:if test="%{totalPage>currentPage}"><a href="browsePaging.action?currentPage=${currentPage+1}" >${currentPage+1}</a>
 <a href="browsePaging.action?currentPage=${currentPage+1}" >下一页</a></s:if>
 <a href="browsePaging.action?currentPage=${totalPage}" >尾页</a></center>

 

<!--根据课程得到的留言-->

<center>
 当前是第${currentPage}页,共有${totalPage}页 
 <a href="saveMessagePaging.action?currentPage=1&courseId=${courseId}" >首页</a> 
 <s:if test="%{currentPage>1}"><a href="saveMessagePaging.action?currentPage=${currentPage-1}&courseId=${courseId}" >上一页</a>  
 <a href="saveMessagePaging.action?currentPage=${currentPage-1}&courseId=${courseId}" >${currentPage-1}</a></s:if>
 <a href="saveMessagePaging.action?currentPage=${currentPage}&courseId=${courseId}" >${currentPage}</a> 
 <s:if test="%{totalPage>currentPage}"><a href="saveMessagePaging.action?currentPage=${currentPage+1}&courseId=${courseId}" >${currentPage+1}</a>
 <a href="saveMessagePaging.action?currentPage=${currentPage+1}&courseId=${courseId}" >下一页</a></s:if> 
 <a href="saveMessagePaging.action?currentPage=${totalPage}&courseId=${courseId}" >尾页</a>
 </center>