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
Email：yanek@163.com
qq:    1046011462

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