SSH超实用分页实现（原创开源）

SSH的分页网上有不少的例子，有利用session的，有利用分页组件的。我几个师兄原来搞的SSH项目也有一个成熟的分页插件。

具体业务实现类中的分页方法：

public List get*****(int pageNO){            DetachedCriteria dc = DetachedCriteria.forClass(****.class);                        List list=*****Dao.getList(dc,pageNO,15);            int a = 0;            if (list.equals(null)){a=1;}            return list;        }

public PageBean getBean(int pageNO)        {            ***** jg;             DetachedCriteria dc = DetachedCriteria.forClass(*****.class);            PageBean pb=collegeDao.getPageBean(dc,pageNO,15);                    return pb;        }

然后是一个PageBean的工具类，负责创建分页属性和基本逻辑。

然后是页面的bean获取输出信息及分页属性。

我觉得单纯的拷贝，自己用的不是很顺手。于是自己也搞了一个，个人认为可以清晰的分层，实现这个分页。分层还是传统的SSH七层结构。

SSH结构思想参考我的另一篇随笔SSH思想之我见！

下面是分页思想，一个初始化方法和一个分页实现方法：

分页的util类：

package com.sy.util;import java.util.List;@SuppressWarnings("unchecked")public class Page {    private int pageSize;    private int totalPage;     private int rowCount;    private int currentPage;    private int prePage;     private int nextPage;    private boolean hasNextPage;    private boolean hasPreviousPage;    private List list;    public Page() {        this.pageSize=10;    }    public int getPageSize() {        return pageSize;    }    public void setPageSize(int pageSize) {        this.pageSize = pageSize;    }    public int getTotalPage() {        return totalPage;    }    public void setTotalPage(int totalPage) {        this.totalPage = totalPage;    }    public int getRowCount() {        return rowCount;    }   public void setRowCount(int rowCount) {        this.rowCount = rowCount;    }   public int getCurrentPage() {        return currentPage;    }    public void setCurrentPage(int currentPage) {        this.currentPage = currentPage;    }    public int getPrePage() {        return prePage;    }    public void setPrePage(int prePage) {        this.prePage = prePage;    }    public int getNextPage() {        return nextPage;    }    public void setNextPage(int nextPage) {        this.nextPage = nextPage;    }    public boolean isHasNextPage() {        return hasNextPage;    }    public void setHasNextPage(boolean hasNextPage) {        this.hasNextPage = hasNextPage;    }    public boolean isHasPreviousPage() {        return hasPreviousPage;    }    public void setHasPreviousPage(boolean hasPreviousPage) {       this.hasPreviousPage = hasPreviousPage;   }    public List getList() {        return list;    }    public void setList(List list) {        this.list = list;    }}

分页的数据库操作和逻辑判断我把他单独用一个PageDaoImpl来实现：

/* * 施杨的分页daoimpl类  * */package com.sy.dao.impl;import java.sql.SQLException;import java.util.List;import org.hibernate.HibernateException;import org.hibernate.Query;import org.hibernate.Session;import org.springframework.orm.hibernate3.HibernateCallback;import org.springframework.orm.hibernate3.support.HibernateDaoSupport;import com.sy.dao.BaseDao;import com.sy.util.Page;@SuppressWarnings("unchecked")public class PageDaoImpl extends HibernateDaoSupport {    private String hql;    public Page page;    public int start;    public BaseDao dao;    public void setDao(BaseDao dao) {        this.dao = dao;    }    public void init(int start,String tableName){    // ͨ       page = new Page();       this.hql = "from "+tableName;       this.start = start;       setRowCount();       setTotalPage();       setCurrentPage();       setPrePage();       setNextPage();       setPreOrNextBoolean();    }    public int getRowCount(){       List list = dao.find(hql);       if(list.isEmpty()){        return 0;       }       return list.size();    }    public Page getPage(){       List list = (List)getHibernateTemplate().execute(new HibernateCallback(){        public Object doInHibernate(Session session) throws HibernateException, SQLException {         Query query = session.createQuery(hql);         query.setFirstResult(getStartIndex());         query.setMaxResults(page.getPageSize());         return query.list();        }          });       page.setList(list);       return page;    }    public void setPreOrNextBoolean() {        if (page.getCurrentPage() <= 1) {            page.setHasPreviousPage(false);        } else {            page.setHasPreviousPage(true);        }        if (page.getCurrentPage() >= page.getTotalPage()) {            page.setHasNextPage(false);        } else {            page.setHasNextPage(true);        }    }    public void setCurrentPage() {        if (start < 1) {            page.setCurrentPage(1);        }        if (start > page.getTotalPage()) {            page.setCurrentPage(page.getTotalPage());        }        page.setCurrentPage(start);    }    public void setPrePage() {        page.setPrePage(page.getCurrentPage() - 1);    }    public void setNextPage() {        page.setNextPage(page.getCurrentPage() + 1);    }    public void setTotalPage() {        int rowCount = getRowCount();        int pageSize = page.getPageSize();        if (rowCount > pageSize) {            if (rowCount % pageSize == 0) {                page.setTotalPage(rowCount / pageSize);            } else {                page.setTotalPage(1 + (rowCount / pageSize));            }        } else {            page.setTotalPage(1);        }    }    public void setRowCount() {        page.setRowCount(getRowCount());    }    public int getStartIndex() {        int startIndex = 0;        if (start < 0) {            startIndex = 0;        } else {            if (start > page.getTotalPage()) {                startIndex = page.getPageSize() * (page.getTotalPage() - 1);            } else {                startIndex = page.getPageSize() * (start - 1);            }        }        return startIndex;    }}

然后是业务层接口，举例AdminService.java

//管理员service层接口package com.sy.service;import java.util.List;import com.sy.util.Page;import com.sy.vo.Admin;public interface AdminService extends BaseService{    //分页初始化    public void init(int pno);//分页实现    public Page getPage();  }

实现类AdminServiceImpl.java

//管理员service层实现类package com.sy.service.impl;import java.util.List;import com.sy.dao.impl.AdminDaoImpl;import com.sy.dao.impl.PageDaoImpl;import com.sy.service.AdminService;import com.sy.util.Page;import com.sy.vo.Admin;@SuppressWarnings("unchecked")public class AdminServiceImpl extends BaseServiceImpl implements AdminService {    public Page getPage() {        return Pdao.getPage();    }    public void init(int pno) {        String tableName="Admin";        Pdao.init(pno,tableName);    }}

struts的action层AdminAction.java

package com.sy.action;import java.util.List;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;import org.apache.struts.action.ActionForm;import org.apache.struts.action.ActionForward;import org.apache.struts.action.ActionMapping;import org.apache.struts.action.ActionMessage;import org.apache.struts.action.ActionMessages;import com.sy.form.AdminForm;import com.sy.form.LoginForm;import com.sy.service.AdminService;import com.sy.util.MD5;import com.sy.util.Page;import com.sy.vo.Admin;@SuppressWarnings("unchecked")public class AdminAction extends BaseAction {        .//查看管理员    public ActionForward listAdmins(ActionMapping mapping, ActionForm form,            HttpServletRequest request, HttpServletResponse response) {        AdminService as=(AdminService)super.getBean("AdminService");           int pno = (new Integer(request.getParameter("pno"))).intValue();           as.init(pno);           Page myPage = as.getPage();           List myList = as.getPage().getList();            request.setAttribute("myPage", myPage);           request.setAttribute("AdminList", myList);           return mapping.findForward("show");               }}

结构清晰，也很实用。

页面lookAdmin.jsp

<%@ page language="java" pageEncoding="UTF-8"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%><%@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean" %><%@ taglib uri="http://struts.apache.org/tags-html" prefix="html" %><%@ taglib uri="http://struts.apache.org/tags-logic" prefix="logic" %><%@ taglib uri="http://struts.apache.org/tags-tiles" prefix="tiles" %><html>    <head>        <meta http-equiv="Content-Language" content="zh-cn">        <meta http-equiv="Content-Type" content="text/html; charset=utf-8">        <title>施杨SSH新闻发布</title>    </head>    <body>        <center>            <h3>                查看管理员            </h3>            <br>            <a href="./admin/addAdmin.jsp">添加管理员</a>            <br>            <a href="./NewsPage2.do?pno=1">查看新闻</a>            <br>            <table border="2" width="600">                <tr>                    <td>                        用户名                    </td>                    <td>                        密码                    </td>                    <td>                        操作                    </td>                </tr>    <c:forEach items="${requestScope['AdminList']}" var="admin">            <tr align="center">              <td width="20%" height="10"><c:out value="${admin.aname}" /></td>              <td width="20%" height="10"><c:out value="${admin.apassword}" /></td>              <td>                <a href="./editAdmin.do?aid=<c:out value="${admin.aid}"/>">修改</a>                                  <a href="./deleteAdmin.do?aid=<c:out value="${admin.aid}"/>" onclick="javascript:return confirm('您确定删除吗？')">删除</a>              </td>            </tr>    </c:forEach>    </table>    <table align="center" width="500">    <tr>       <td align="center" colspan="10">          <logic:present name="myPage">            <html:link page="/AdminPage.do?pno=1">首页</html:link>          <logic:equal name="myPage" property="hasPreviousPage" value="false">上一页</logic:equal>          <logic:equal name="myPage" property="hasPreviousPage" value="true">           <a href="./AdminPage.do?pno=<bean:write name="myPage" property="prePage"/>">上一页</a>      </logic:equal>                      每页<bean:write name="myPage" property="pageSize"/>条记录           共<bean:write name="myPage" property="rowCount"/>条记录                当前第(<bean:write name="myPage" property="currentPage"/>/<bean:write name="myPage" property="totalPage"/>)页        <logic:equal name="myPage" property="hasNextPage" value="false">下一页</logic:equal>        <logic:equal name="myPage" property="hasNextPage" value="true">         <a href="./AdminPage.do?pno=<bean:write name="myPage" property="nextPage"/>">下一页</a>        </logic:equal>           <a href="./AdminPage.do?pno=<bean:write name='myPage' property='totalPage'/>">末页</a>        </logic:present>      </td>      </tr>    </table>        </center>    </body></html>

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作者：施杨（施杨's Think out）
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