struts+hibernate分页实现

新建page.java

package page.dal;

public class page {
private int totalRows; //总行数
private int pageSize = 10; //每页显示的行数
private int currentPage; //当前页号
private int totalPages; //总页数
private int startRow; //当前页在数据库中的起始行

public page(int _totalRows) {
totalRows = _totalRows;
totalPages=totalRows/pageSize;
int mod=totalRows%pageSize;
if(mod>0){
totalPages++;
}
currentPage = 1;
startRow = 0;
}

public int getStartRow() {
return startRow;
}

public int getTotalPages() {
return totalPages;
}

public int getCurrentPage() {
return currentPage;
}

public int getPageSize() {
return pageSize;
}

public void setTotalRows(int totalRows) {
this.totalRows = totalRows;
}

public void setStartRow(int startRow) {
this.startRow = startRow;
}

public void setTotalPages(int totalPages) {
this.totalPages = totalPages;
}

public void setCurrentPage(int currentPage) {
this.currentPage = currentPage;
}

public void setPageSize(int pageSize) {
this.pageSize = pageSize;
}

public int getTotalRows() {
return totalRows;
}

public void first() {
currentPage = 1;
startRow = 0;
}

public void previous() {
if (currentPage == 1) {
return;
}
currentPage--;
startRow = (currentPage - 1) * pageSize;
}

public void next() {
if (currentPage < totalPages) {
currentPage++;
}
startRow = (currentPage - 1) * pageSize;
}

public void last() {
currentPage = totalPages;
startRow = (currentPage - 1) * pageSize;
}

public void refresh(int _currentPage) {
currentPage = _currentPage;
if (currentPage > totalPages) {
last();
}
}

}

新建 pageHelp.java

package page.dal;
import javax.servlet.http.*;

public class PagerHelp {
public static page getPager(HttpServletRequest httpServletRequest,int totalRows) {

//定义pager对象，用于传到页面
page pager = new page(totalRows);

//从Request对象中获取当前页号
String currentPage = httpServletRequest.getParameter("currentPage");

//如果当前页号为空，表示为首次查询该页
//如果不为空，则刷新page对象，输入当前页号等信息
if (currentPage != null) {
pager.refresh(Integer.parseInt(currentPage));
}

//获取当前执行的方法，首页，前一页，后一页，尾页。
String pagerMethod = httpServletRequest.getParameter("pageMethod");

if (pagerMethod != null) {
if (pagerMethod.equals("first")) {
pager.first();
} else if (pagerMethod.equals("previous")) {
pager.previous();
} else if (pagerMethod.equals("next")) {
pager.next();
} else if (pagerMethod.equals("last")) {
pager.last();
}
}
return pager;
}

}

新建 util.java
package page.dal;
import net.sf.hibernate.Query;
import net.sf.hibernate.cfg.Configuration;
import java.util.List;
import net.sf.hibernate.HibernateException;
import net.sf.hibernate.SessionFactory;
import net.sf.hibernate.Session;
import java.util.*;
public class util {
public util() {
}
private Session ss=null;
public Session getSession()
{
// Configuration config=null;
SessionFactory sessionFactory;
try {
Configuration cfg = new Configuration();
sessionFactory = cfg.addClass(articleVO.class).
buildSessionFactory();
// SessionFactory sessionFactory=config.buildSessionFactory();
ss = sessionFactory.openSession();
return ss;
} catch (HibernateException ex) {
System.out.print("getsession出错了。。" + ex.getMessage());
return null;
}
}

public int getCount()
{
String sql="select count(*) from articleVO" ;
this.getSession();

try {
// ss.createQuery("select count(a)as cont from articleVO a ");
int rows= ((Integer) ss.iterate(sql).next()).intValue();
ss.flush();
return rows;

} catch (HibernateException ex) {
System.out.print("ex::"+ex.getMessage());
return 0;
}

}

public Collection getList(int pagesize,int currow) throws HibernateException {
Collection vehicleList = null;
this.getSession();
Query q=ss.createQuery("from articleVO");
q.setFirstResult(currow);
q.setMaxResults(pagesize);
vehicleList=q.list();
ss.flush();
return vehicleList;
}

}

新建 struts PageAction.java

package page.dal;

import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionForm;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.Action;
import page.dal.*;
import java.util.*;
import net.sf.hibernate.*;

public class pageAction extends Action {
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request,
HttpServletResponse response) {
Collection clInfos = null;//用于输出到页面的记录集合
int totalRows;//记录总行数
util dal=new util();
totalRows=dal.getCount();
System.out.print("总行数=="+totalRows);
page p=PagerHelp.getPager(request,totalRows);
try {
clInfos = dal.getList(p.getPageSize(), p.getStartRow());

} catch (HibernateException ex) {
System.out.print("action里的错误="+ex.getMessage());
}
request.setAttribute("page",p);
request.setAttribute("list",clInfos);
return mapping.findForward("page");
//pageForm pageForm = (pageForm) form;
// throw new java.lang.UnsupportedOperationException(
// "Method $execute() not yet implemented.");
}
}

前台页面

<%@ taglib uri="/WEB-INF/struts-tiles.tld" prefix="tiles" %>
<%@ taglib uri="/WEB-INF/struts-nested.tld" prefix="nested" %>
<%@ taglib uri="/WEB-INF/struts-logic.tld" prefix="logic" %>
<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %>
<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>
<%@ page contentType="text/html; charset=GBK" %>
<html:html>
<head>
<title>
page
</title>
</head>
<body>
<table align="center" border="2">
<tr>
<th>a_title</th>
<th>a_body</th>
<th>a_a_date</th>
<th>a_author</th>
</tr>

<logic:iterate id="listd" name="list">
<tr>
<td>
<bean:write name="listd" property="a_title"/>
</td>
<td>
<bean:write name="listd" property="a_author"/>
</td>
<td>
<bean:write name="listd" property="a_date"/>
</td>
<td>
<bean:write name="listd" property="a_date"/>
</td>
</tr>
</logic:iterate>

</table>

第<bean:write name="page" property="currentPage"/>页
共<bean:write name="page" property="totalPages" />页
<html:link action="/pageAction.do?pageMethod=first"
paramName="page" paramProperty="currentPage" paramId="currentPage">首页</html:link>
<html:link action="/pageAction.do?pageMethod=previous"
paramName="page" paramProperty="currentPage" paramId="currentPage">上一页</html:link>
<html:link action="/pageAction.do?pageMethod=next"
paramName="page" paramProperty="currentPage" paramId="currentPage">下一页</html:link>

<html:link action="/pageAction.do?pageMethod=last"
paramName="page" paramProperty="currentPage" paramId="currentPage">尾页</html:link>
</body>
</html:html>

启动浏览 pageAction.do 运行OK。