偷窥struts+hibernate分页(第一种方法)

根据原文有点改动。原文忘记在那里看到了。看到提个醒


新建表

DROP DATABASE IF EXISTS `wjcms`;
CREATE DATABASE `wjcms` /*!40100 DEFAULT CHARACTER SET gb2312 */;
USE `wjcms`;

#
# Table structure for table t_article
#

CREATE TABLE `t_article` (
  `a_id` int(11) NOT NULL auto_increment,
  `a_sort` int(11) NOT NULL default '0',
  `a_title` varchar(50) default NULL,
  `a_body` text,
  `a_author` varchar(11) default '',
  `a_hit` int(11) NOT NULL default '0',
  `c_id` int(11) default '0',
  `a_date` varchar(20) default NULL,
  PRIMARY KEY  (`a_id`)
)

实体

public class articleVO {
    private int a_id;
    private int a_sort;
    private int a_hit;
    private int c_id;
    private String a_title;
    private String a_body;
    private String a_author;
    private String a_date;
    // getter setter


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。



****************************************************************************************


配置文件


<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE hibernate-mapping PUBLIC
    "-//Hibernate/Hibernate Mapping DTD 2.0//EN"
    "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">
<hibernate-mapping>

    <class name="page.dal.articleVO" table="t_article" >


    <id name="a_id" column="a_id" unsaved-value="0" >
      <generator class="native"/>
</id>
     <property name="c_id"    column="c_id"/>
     <property name="a_title" column="a_title"/>
     <property name="a_sort"  column="a_sort"/>
     <property name="a_date"  column="a_date"/>
     <property name="a_body"  column="a_body"/>
     <property name="a_hit"   column="a_hit"/>
     <property name="a_author" column="a_author"/>
  
   
  </class>

</hibernate-mapping>

hibernate.dialect net.sf.hibernate.dialect.MySQLDialect
hibernate.connection.driver_class org.gjt.mm.mysql.Driver
hibernate.connection.url jdbc:mysql://localhost:3306/wjcms
hibernate.connection.username root
hibernate.connection.password
hibernate.connection.pool_size 1
hibernate.proxool.pool_alias pool1
hibernate.show_sql true
hibernate.max_fetch_depth 1
hibernate.cache.use_query_cache true