本文实例讲述了Struts2+Hibernate实现数据分页的方法。分享给大家供大家参考,具体如下:
1.用Hibernate实现分页技术:
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/** * 使用hql语句进行分页查询 * @param hql 需要查询的hql语句 * @param offset 第一条记录索引 * @param pageSize 每页需要显示的记录数 * @return 当前页的所有记录 */ @SuppressWarnings ( "unchecked" ) public List findByPage( final String hql, final int offset, final int pageSize) { //通过一个HibernateCallback对象来执行查询 List list = getHibernateTemplate() .executeFind( new HibernateCallback() { //实现HibernateCallback接口必须实现的方法 public Object doInHibernate(Session session) throws HibernateException, SQLException { //执行Hibernate分页查询 List result = session.createQuery(hql) .setFirstResult(offset) .setMaxResults(pageSize) .list(); return result; } }); return list; } // 获取总记录数 public int getRows(String hql) { return getHibernateTemplate().find(hql).size(); } |
2.在Action里调用Hibernate实现分页技术的方法,并跳转到显示界面:
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// 分页 @SuppressWarnings ( "unchecked" ) public String paging() { String hql = "from Income" ; // 分页的数据表 int pageSize = 3 ; // 每页显示记录的条数 int allRows = service.getRows(hql); // 记录总数 int allPage = 0 ; // 总页数 int offset = getPage() + 1 ; // 第一条记录的索引 /*if (rows % size != 0) { pageSize = rows / size + 1; } else { pageSize = rows / size; }*/ allPage = (allRows - 1 ) / pageSize + 1 ; // 计算总页数 List<Income> income = service.findByPage(hql, (offset- 1 )*pageSize, pageSize); request.setAttribute( "allPage" , allPage); request.setAttribute( "offset" , offset); request.setAttribute( "income" , income); return "paging" ; } |
3.struts.xml配置:
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< action name = "income" class = "com.xqh.action.IncomeAction" > <!-- 为两个逻辑视图配置视图页面 --> < result name = "error" >/error.jsp</ result > < result name = "paging" >/income/income_list.jsp</ result > < result name = "update" >/income/income_edit.jsp</ result > </ action > |
4.显示界面income_list.jsp
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<%@ page language= "java" pageEncoding= "GBK" %> <%@ taglib prefix= "fmt" uri= "http://java.sun.com/jsp/jstl/fmt" %> <%@ taglib prefix= "s" uri= "/struts-tags" %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" > <head> <title>收入列表</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" > <link rel= "stylesheet" type= "text/css" href= "../images/styles.css" > </head> <body> <div class = "div1" > <table width= "100%" cellpadding= "0" cellspacing= "0" border= "0" align= "center" > <tr> <td class = "td_title1" > ·当前位置:收入管理>>查看收入 </td> </tr> <tr> <td bgcolor= "#FFFFFF" height= "50" > <br> <table border= "1" align= "center" width= "700" cellpadding= "1" cellspacing= "1" bgcolor= "#036500" bordercolor= "#FFFFF" > <tr bgcolor= "#FFFFFF" > <td class = "tb_tl" align= "center" > 收入编号 </td> <td class = "tb_tl" align= "center" > 日期 </td> <td class = "tb_tl" align= "center" > 方式 </td> <td class = "tb_tl" align= "center" > 金额 </td> <td class = "tb_tl" align= "center" > 项目 </td> <td class = "tb_tl" align= "center" > 来源 </td> <td class = "tb_tl" align= "center" > 人员 </td> <td class = "tb_tl" align= "center" > 备注 </td> <td class = "tb_tl" align= "center" > 操作 </td> </tr> <s:iterator value= "#request.income" > <tr bgcolor= "#FFFFFF" > <td align= "center" ><s:property value= "id" /></td> <td align= "center" ><s:date name= "date" format= "yyyy-MM-dd" /></td> <td align= "center" ><s:property value= "style" /></td> <td align= "center" ><s:property value= "money" /></td> <td align= "center" ><s:property value= "project" /></td> <td align= "center" ><s:property value= "source" /></td> <td align= "center" ><s:property value= "personnel" /></td> <td align= "center" ><s:property value= "remarks" /></td> <td align= "center" > <a href= "javascript:if(confirm('确定要删除${id}吗?'))location='income!del?id=${id}'" >删除</a> <a href= "javascript:if(confirm('确定要修改${id}吗?'))location='income!updateTo?id=${id}'" >修改</a> </td> </tr> </s:iterator> </table> <center> 总共有${allPage}页, 当前是第${offset}页 <a href= "income!paging?page=0" ><font size= "2" color= "blue" >首页</font></a> <a href= "javascript:if(${offset}>1)location='income!paging?page=${page-1}'" ><font size= "2" color= "red" >上一页</font></a> <a href= "javascript:if(${offset}<${allPage})location='income!paging?page=${page+1}'" ><font size= "2" color= "red" >下一页</font></a> <a href= "income!paging?page=${allPage-1}" ><font size= "2" color= "blue" >末页</font></a> </center> </td> </tr> </table> </div> </body> |
5.分页结果:
本文章未提供底层数据库中的实现,但只要掌握分页原理,相信这问题不大。具体分页原理可参照前面一篇:《Hibernate框架数据分页技术实例分析》
希望本文所述对大家基于Hibernate框架的Java程序设计有所帮助。