分页封装实用工具类及其使用方法

分页封装实用工具类及其使用方法

作者： javaboy2012

 

package com.yanek.util;

import java.util.List;

public class PageBean {

  /**
   * @param args
   */
  public static void main(String[] args) {

  }

  private int currentpage; // 当前页数
  private int pagesize; // 每页大小
  private int totalPagecount; // 总页数
  private int totalRecordCount; // 总记录数
  private List recordContents; // 当前页记录内容列表

  public int getCurrentpage() {
    return currentpage;
  }

  public int getPagesize() {
    return pagesize;
  }

  public List getRecordContents() {
    return recordContents;
  }

  public int getTotalPagecount() {
    return totalPagecount;
  }

  public int getTotalRecordCount() {
    return totalRecordCount;
  }

  public PageBean(int currentpage, int pagesize, int totalRecordCount, List recordContents) {
    super();
    this.currentpage = currentpage;
    this.pagesize = pagesize;
    this.totalRecordCount = totalRecordCount;
    this.recordContents = recordContents;

    if (totalRecordCount % pagesize == 0) {
      this.totalPagecount = totalRecordCount / pagesize;
    } else {
      this.totalPagecount = totalRecordCount / pagesize + 1;
    }
  }

}




调用方法：

 action里调用：


  public ActionForward list(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) {
    
                TopicDAO tdao=new TopicDAOImpl();

    String s_pagesize=(String)request.getParameter("pagesize");
    int pagesize=20;
    if (s_pagesize!=null)
    {
      pagesize=Integer.parseInt(s_pagesize);
    }
    int pagecount=1;
    String s_pagecount=(String)request.getParameter("pagecount");
    if (s_pagecount!=null)
    {
      pagecount=Integer.parseInt(s_pagecount);
    }
                
                //得到记录总数    

    long totalcount=tdao.getTopicTotalCount();
    
    
    System.out.println("total:"+totalcount);
    
    List topics=tdao.getTopics(pagesize,pagecount);
    
    for (int i=0;i<topics.size();i++)
    {
      TopicBean tb=(TopicBean)topics.get(i);
      
      System.out.println(tb.getTid()+"-"+tb.getTname());
    }
    
    
    PageBean  pb=new PageBean(pagecount,pagesize, (int)totalcount,topics);

  
    request.setAttribute("topic_pagebean", pb);
    
    return mapping.findForward("topic_list");
  }


jsp页面调用示例：

  <%
  
      PageBean  pb=(PageBean)request.getAttribute("topic_pagebean");
      List topics=pb.getRecordContents();
   %>
  

<div class="cont">

<center><h2>记录列表</h2></center><br/><br/>
  <div class="list">
  
<form name="topic"  action="topic.do" method="get">


      <input type="hidden" name="method" value="list" />
      <input type="hidden" name="pagesize" value="<%=pb.getPagesize()%>" />


    <table width="100%" border="0">
        <tr class="white">
          <th class="sl1" width="30%">标题</th>
          <th width="30%" class="sl1">描述</th>
          <th class="sl1" width="25%">ID </th>
          <th width="15%"> 操作</th>
        </tr>
        
      
        <% 
        
        for (int i=0;i<topics.size();i++)
    {
      TopicBean tb=(TopicBean)topics.get(i);
      %>
  
      <%
       String classname="";
       if (i%2==1) 
       {
        classname="white";
       }
    
      %>
      <tr class="<%=classname %>">
            <td><%=tb.getTname() %></td>
            <td><%=tb.getTdesc() %></td>
            <td>
        
        <%=tb.getTid() %>
        </td>
            <td><a href='/topic.do?method=view&tid=<%=tb.getTid() %>'>[查看]</a></td>
          </tr>
      
      
      <%
      
    }
    %>
    
        
          
        
          
    
          <tr>
    <td colspan="6">
    <p align="center">
    <br/>
    
    共<%=pb.getTotalRecordCount() %>个记录,共<%=pb.getTotalPagecount() %>页,每页<%=pb.getPagesize() %>个 ,当前第<%=pb.getCurrentpage() %>页
  
    
    
     <%
   if (pb.getCurrentpage()==1)
   {
     
     out.print("首页  上页 ");
   }
   else
   {
     %>
      <a href="topic.do?method=list&pagecount=1&pagesize=<%=pb.getPagesize() %>">首页</a>
      <a href="topic.do?method=list&pagecount=<%=pb.getCurrentpage()-1%>&pagesize=<%=pb.getPagesize() %>">上页</a>
     <%
     
   }
   %>
   
    <%
   if (pb.getCurrentpage()==pb.getTotalPagecount())
   {
     
     out.print("下一页  尾页 ");
   }
   else
   {
     %>
  
  <a href="topic.do?method=list&pagecount=<%=pb.getCurrentpage()+1 %>&pagesize=<%=pb.getPagesize() %>">下一页 </a>
  <a href="topic.do?method=list&pagecount=<%=pb.getTotalPagecount() %>&pagesize=<%=pb.getPagesize() %>">  尾页</a>
     <%
     
   }
   %> 
    
    
    
    转到第 <input type="text" name="pagecount" value="<%=pb.getCurrentpage() %>" size="4"> 页
    
     <input type="submit" value="GO" size="4">
    
    </td>
  </tr>
  
     
    
  
  
      </table></form>
    
   
  </div>
</div>


action配置

<action path="/topic" type="com.myweb.web.action.TopicAction" scope="request"  parameter="method">
      <forward name="topic_list" path="/WEB-INF/pages/test/test/topic_list.jsp"/>
</action>

访问方式： http://192.168.0.1/topic.do?method=list&pagecount=1&pagesize=10