利用PAGER-TAGLIB分页.txt-优快云博客

第一步:写一个页页模形类
package com.zhongbin.oa.pagination;

import java.util.List;

public class PageModel {
/*
* 总页数
*/
private int allCount;
/*
* 返回的当前显示页内容
*/
private List dates;

public int getAllCount() {
  return allCount;
}
public void setAllCount(int allCount) {
  this.allCount = allCount;
}
public List getDates() {
  return dates;
}
public void setDates(List dates) {
  this.dates = dates;
}
}

第二步:写一个THREADLOCAL类处理分页参数
package com.zhongbin.oa.pagination;
/*
* 处理分页时的参数,将分页参数放置于ThreadLocal中
*/
public class SystemContext {

/*
* 当前页分页开始的记录数
*/
private static ThreadLocal ffSet = new ThreadLocal();
/*
* 每页分页的记录条数
*/
private static ThreadLocal pageSize = new ThreadLocal();

public static void setOffSet(int offSetValue){
  offSet.set(offSetValue);
}

public static void setPageSize(int pageSizeValue){
  pageSize.set(pageSizeValue);
}

public static int getOffSet(){
  int f = 0;
  try {
   of = Integer.parseInt(offSet.get().toString());
  } catch (NumberFormatException e) {

   of = 0;
  }
  return of;
}

public static int getPageSize(){
  int ps = 0;
  try {
   ps = Integer.parseInt(pageSize.get().toString());
  } catch (NumberFormatException e) {
   ps=Integer.MAX_VALUE;
  }
  return ps;
}

public static void removeOffSet(){
  offSet.remove();
}

public static void removePageSize(){
  pageSize.remove();
}
}

第三步:写一个FILTER保存参数
package com.zhongbin.oa.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;

import com.zhongbin.oa.pagination.SystemContext;

public class PaginationFilter implements Filter{

public void destroy() {

}

public void doFilter(ServletRequest arg0, ServletResponse arg1,
   FilterChain chain) throws IOException, ServletException {

  HttpServletRequest request = (HttpServletRequest)arg0;
  //设置分页参数
  SystemContext.setOffSet(getOffSet(request));
  SystemContext.setPageSize(getPageSize(request));
  //继续后面的工作
  chain.doFilter(arg0, arg1);
  //完成工作后移除参数
  SystemContext.removeOffSet();
  SystemContext.removePageSize();

}

private int getOffSet(HttpServletRequest request){
  int ffSet = 0;
  String str = request.getParameter("pager.offset");

  try {
   offSet = Integer.parseInt(str);
  }catch(NumberFormatException e){
   offSet = 0;
  }
  return offSet ;
}

private int getPageSize(HttpServletRequest request){

  return 10;
/* int pageSize = 0;
  String str = request.getParameter("pagesize");
  try{
   pageSize = Integer.parseInt(str);
  }finally{
   pageSize = Integer.MAX_VALUE;
  }
  return pageSize;*/
}

public void init(FilterConfig arg0) throws ServletException {

}

}

第四步:在WEB.XML中配置FILTER

<!-- 设置分面参数过虑器 --&gt

  paginationFilter

   com.zhongbin.oa.filter.PaginationFilter


  paginationFilter
  /*

第五步,写一个ABSTRACTSERVICES类实现分页的方法及获取FILTER保存的参数

package com.zhongbin.oa.services;

import java.util.List;

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

import com.zhongbin.oa.exception.SystemException;
import com.zhongbin.oa.pagination.PageModel;
import com.zhongbin.oa.pagination.SystemContext;
/*
* 实现了分页功能的父类,有需要实现分页功能的SERVICE类可以直接继承此类获得分面功能
*
*/
public class AbstractServices extends HibernateDaoSupport {

/*
* 跟据一条HQL 语句返回分页数据
*/
public PageModel searchPaginated(String hql ){
  return searchPaginated(hql,null);
}
/*
* 跟据一条HQL 语句与一个参数返回分页数据
*/
public PageModel searchPaginated(String hql ,Object param){
  return searchPaginated(hql,new Object[]{param});
}
/*
* 跟据一条HQL 语句与一个参数数组返回分页数据
*/
public PageModel searchPaginated(String hql ,Object[] params){
  //用THREADLOCAL 中获取分页参数
  int ffset = SystemContext.getOffSet();
  int pagesize = SystemContext.getPageSize();


  //待设置的总页数
  int allCount = 0;
  //待设置的返回数据
  List dates = null;
  //获取返回总页数的HQL
  String allCountHql = this.getAllCountHQL(hql);
  Query queryAllCount = this.getSession().createQuery(allCountHql);
  //设置参数
  if(params != null && params.length>0){
   for (int i = 0; i < params.length; i++) {
    queryAllCount.setParameter(i, params[i]);
   }
  }

  allCount = ((Long)queryAllCount.uniqueResult()).intValue();

  //查询出要返回的数据
  Query queryDates = this.getSession().createQuery(hql);
  if(params != null && params.length>0){
   for (int i = 0; i < params.length; i++) {
    queryDates.setParameter(i, params[i]);
   }
  }
  System.out.println("offset : " + offset + "pagesize : " + pagesize);
  dates = queryDates.setFirstResult(offset).setMaxResults(pagesize).list();

  PageModel pm = new PageModel();
  pm.setAllCount(allCount);
  pm.setDates(dates);
  //返回数据
  return pm;
}

//设置返回总记录数的HQL
private String getAllCountHQL(String hql){
  int index = hql.indexOf("FROM");
  String allCountHQL = null;
  if(index != -1){
     allCountHQL = "SELECT COUNT(*) " + hql.substring(index);
  }else{
   throw new SystemException("非法的HQL语句","exception.hql.001",hql);
  }
  return allCountHQL;
}
}

第六步:写一个SERVICES 继承 ABSTRACTSERVICES 调用它的方法获取分面数据:
package com.zhongbin.oa.services.impl

import com.zhongbin.oa.exception.SystemException;
import com.zhongbin.oa.pagination.PageModel;
import com.zhongbin.oa.pojo.Orgnization;
import com.zhongbin.oa.services.AbstractServices;
import com.zhongbin.oa.services.OrgServices;

public class OrgServicesImpl extends AbstractServices implements OrgServices {

/*
* 跟据PID查询所有子部门
* @see com.zhongbin.oa.services.OrgServices#findOrgs(int)
*/
public PageModel findOrgs(int parentId) {
  if(parentId == 0){
   return super.searchPaginated("FROM Orgnization as o where o.parent is null");
  }else {
   return super.searchPaginated("FROM Orgnization as o where o.parent.id = ?",parentId);
  }
}

}

第七步:在ACTION 中调用此服务类的方法获取数据放于REQUEST中,在页面用于下方式显示:

<!-- 在列表数据为空的时候，要显示的提示信息 --&gt
    <!--orgPM.dates 你设置在REQUEST的分页数据--&gt

             class="TableBody1" nmouseover="this.bgColor = '#DEE7FF';"
       οnmοuseοut="this.bgColor='#EFF3F7';">
       没有找到相应的记录

background=images/list_middle.jpg>

       <!-- 分页代码开始 --&gt
               export="currentPageNumber=pageNumber">
        <!--你的URL中的其它参数--&gt
        <!--你的URL中的其它参数--&gt

         首页


         前页




           ${pageNumber }


           ${pageNumber }




         后页


         尾页


       <!-- 分页代码结束 --&gt

最后需注意的,不要忘记在CLASSPATH中导入pager-taglib.jar
以及在JSP中导入:

来自 “ ITPUB博客 ” ，链接：http://blog.itpub.net/13925369/viewspace-462944/，如需转载，请注明出处，否则将追究法律责任。

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