SSH1/2 J2EE 纯Java版分页查询

实体bean---------> PageBean.java

package com.demo.page;

import java.util.List;

public class PageBean {
	
	/*==============================================================*/
	private List resultList;//结果集
	private int recordSUM;//总记录数
	private int pageSUM;//总页数
	private int currentPage;//当前页
	private int pageSize;//页记录数
	private boolean isFirstPage;//是否是第一页   
	private boolean isLastPage;//是否是最后一页
	private boolean hasPreviousPage;//是否有上一页
	private boolean hasNextPage;//是否有下一页
	/*===========================初始化===================================*/
	public void init(){ 
		this.isFirstPage = isFirstPage(); 
	    this.isLastPage = isLastPage(); 
	    this.hasPreviousPage = isHasPreviousPage(); 
	    this.hasNextPage = isHasNextPage(); 
	} 
	/*=============================总页数=================================*/
	public static int countTotalPage(int pageSize,int recordSUM){ 
		
		int totalPage = recordSUM % pageSize == 0 ? recordSUM/pageSize : recordSUM/pageSize+1; 
		
	    return totalPage; 
	} 
	/*============================当前页开始记录号 ==================================*/
	public static int countOffset(final int pageSize,final int currentPage){ 
		
		final int offset = pageSize*(currentPage-1); 
		
	    return offset; 
	} 
	/*=============================当期页=================================*/
	public static int countCurrentPage(int page){ 
		
		final int curPage = (page==0?1:page); 
		
	    return curPage; 
	} 
	/*============================判断当前页的状态==================================*/
	public boolean isFirstPage() { 
		return currentPage == 1;    
	} 
	public boolean isLastPage() { 
	    return currentPage == pageSUM;    
	} 
	public boolean isHasPreviousPage() { 
	    return currentPage != 1;         
	} 
	public boolean isHasNextPage() { 
		return currentPage != pageSUM;    
	} 
	/*===========================Get/Set方法===================================*/
	public List getResultList() {
		return resultList;
	}
	public void setResultList(List resultList) {
		this.resultList = resultList;
	}
	public int getRecordSUM() {
		return recordSUM;
	}
	public void setRecordSUM(int recordSUM) {
		this.recordSUM = recordSUM;
	}
	public int getPageSUM() {
		return pageSUM;
	}
	public void setPageSUM(int pageSUM) {
		this.pageSUM = pageSUM;
	}
	public int getCurrentPage() {
		return currentPage;
	}
	public void setCurrentPage(int currentPage) {
		this.currentPage = currentPage;
	}
	public int getPageSize() {
		return pageSize;
	}
	public void setPageSize(int pageSize) {
		this.pageSize = pageSize;
	}
	/*==============================================================*/
     
}

JSP页面

<%@ page language="java" import="java.util.*" pageEncoding="GBK"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'listUser.jsp' starting page</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">

  </head>
  
  <body>
 	  <table border="" >
 		<tr>
 	 		<td><input type="checkbox"></td><td>用户名</td><td>密码</td><td>性别</td><td>年龄</td><td>邮箱</td><td>地址</td>
 	 	</tr>
 	 <s:iterator value="resultList" id="user">
 	 	<tr>
 	 		<td><input type="checkbox"></td>
 	 		<td><s:property value="#user.username"/></td>
 	 		<td><s:property value="#user.password"/></td>
 	 		<td><s:property value="#user.sex"/></td>
 	 		<td><s:property value="#user.age"/></td>
 	 		<td><s:property value="#user.email"/></td>
 	 		<td><s:property value="#user.address"/></td>
 		</tr>
 	 </s:iterator>
 	 </table>
       共<s:property value="pageBean.recordSUM"/> 条记录 
       共<s:property value="pageBean.pageSUM"/> 页 
       当前第<s:property value="pageBean.currentPage"/>页<br/> 

       <s:if test="%{pageBean.currentPage == 1}"> 
    		第一页 上一页
       </s:if> 
       <s:else> 
           [url=showUser.action?page=1]第一页[/url] 
           [url=showUser.action?page=<s:property value=]">上一页[/url] 
       </s:else> 
       <s:if test="%{pageBean.currentPage != pageBean.pageSUM}"> 
           [url=showUser.action?page=<s:property value=]">下一页[/url] 
           [url=showUser.action?page=<s:property value=]">最后一页[/url] 
       </s:if> 
       <s:else> 
           下一页 最后一页 
       </s:else>
  </body>
</html>

PageServiceImplForUser.java

package com.demo.page;

import java.util.List;

import com.demo.entity.dao.AdminiDao;
import com.demo.entity.dao.UserDao;


public class PageServiceImplForUser implements PageService {

	private UserDao userDao; 
	   
	public UserDao getUserDao() {
		return userDao;
	}

	public void setUserDao(UserDao userDao) {
		this.userDao = userDao;
	}

	public PageBean queryForPage(int pageSize, int currentPage,String hql) {
		// TODO Auto-generated method stub
		
		int recordSUM = userDao.getAllRowCount(hql);//总记录数 
		int pageSUM = PageBean.countTotalPage(pageSize, recordSUM);//总页数 
		final int offset = PageBean.countOffset(pageSize, currentPage);//当前页开始记录 
		final int length = pageSize;//每页记录数 
		final int page = PageBean.countCurrentPage(currentPage);//当前页
		List<AdminiDao> list = userDao.queryForPage(hql,offset, length);//"一页"的记录 
	        
		//把分页信息保存到Bean中 
		PageBean pageBean = new PageBean(); 
		pageBean.setPageSize(pageSize);     
		pageBean.setCurrentPage(page); 
		pageBean.setRecordSUM(recordSUM); 
		pageBean.setPageSUM(pageSUM);
		pageBean.setResultList(list);
		pageBean.init(); 
		return pageBean; 		
	}

}

UserDaoImpl.java

package com.demo.entity.dao.Impl;

import java.util.ArrayList;
import java.util.List;

import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.Transaction;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;

import com.demo.entity.User;
import com.demo.entity.dao.UserDao;
import com.demo.hibernate.utils.HibernateSessionFactory;

public class UserDaoImpl extends HibernateDaoSupport implements UserDao {

	public int getAllRowCount(String hql) {
		// TODO Auto-generated method stub
		
		Session session=HibernateSessionFactory.getSession();
		
		int i=session.createQuery("from User").list().size();
		
		return i;
	}

	public List queryForPage(String hql, int offset, int length) {
		// TODO Auto-generated method stub
		
		List list=new ArrayList();
		
		Session session=HibernateSessionFactory.getSession();
		
		Query query=session.createQuery(hql);
		
		query.setFirstResult(offset);
		
		query.setMaxResults(length);
		
		list=query.list();
		
		return list;
	}

	public String addUser(User user) {
		// TODO Auto-generated method stub
		
		Session session=HibernateSessionFactory.getSession();
		
		Transaction tx=session.beginTransaction();
		
		session.save(user);
		
		tx.commit();
		
		session.close();
		
		return "success";
	}
}

ACTION---------> ShowUser.java

package com.demo.action;

import java.util.ArrayList;
import java.util.List;

import com.demo.entity.dao.Impl.AdminiDaoImpl;
import com.demo.entity.dao.Impl.UserDaoImpl;
import com.demo.page.PageBean;
import com.demo.page.PageService;
import com.opensymphony.xwork2.ActionSupport;

public class ShowUser extends ActionSupport {

	//通过applicationContext.xml配置文件注入UserService的值 
	private PageService pageService;//PAGE服务类
	private int page; //当第几页   
	private PageBean pageBean;//包含分布信息的bean    
	private UserDaoImpl userDaoImpl;//用户dao实现	
	private String hql;//查询SQL
	private int pageSize;//每页记录数
	private List resultList=new ArrayList();//返回结果集

	@Override
	public String execute() throws Exception {
		
		//分页的pageBean,参数pageSize表示每页显示记录数,page为当前页 
		
	    pageBean = pageService.queryForPage(pageSize, page, hql);
	    
	    resultList=userDaoImpl.queryForPage(hql, getFirstNum()-1, pageSize);
	    
	    return "showUser"; 
	}

	private int getFirstNum(){
		
		if(page==1){
			
			return 1;
			
		}else{
			
			return (page-1)*20+1;
		}
	}
	
	/**
	 *  Get/Set方法
	*/
	public PageService getPageService() {
		return pageService;
	}
	public void setPageService(PageService pageService) {
		this.pageService = pageService;
	}
	public int getPage() {
		return page;
	}
	public void setPage(int page) {
		this.page = page;
	}
	public PageBean getPageBean() {
		return pageBean;
	}
	public UserDaoImpl getUserDaoImpl() {
		return userDaoImpl;
	}
	public void setUserDaoImpl(UserDaoImpl userDaoImpl) {
		this.userDaoImpl = userDaoImpl;
	}
	public void setPageBean(PageBean pageBean) {
		this.pageBean = pageBean;
	}
	public String getHql() {
		return hql;
	}
	public void setHql(String hql) {
		this.hql = hql;
	}
	public int getPageSize() {
		return pageSize;
	}
	public void setPageSize(int pageSize) {
		this.pageSize = pageSize;
	}
	public List getResultList() {
		return resultList;
	}
	public void setResultList(List resultList) {
		this.resultList = resultList;
	}
}

spring中的配置

	<!-- =========================================================================== -->
	<bean id="showUser" class="com.demo.action.ShowUser">
		<property name="PageService" ref="pageServiceForUser"></property>
		<property name="pageBean" ref="pageBean"></property>
		<property name="UserDaoImpl" ref="userDao"></property>
		<property name="page" value="1"></property>
		<property name="pageSize" value="16"></property>
		<property name="hql" value="from User"></property>
	</bean>
	<!-- =========================================================================== -->

SSH1/2 J2EE 纯Java版分页查询

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