分页的基类

import java.util.List;  /**   * 分页显示的标准类,基本操作,是先给予-当前页数一共的数据条数-每页显示的条数,   *  然后在初始化该类,得到总共页数,和开始序号和结束序号,   *  然后数据库分页用到开始序号和结束序号,得到数据集合后赋值给该类的list属性,   *     * 然后把该类发送到jsp页面,进行访问   * @author admin   *   * @param <T>   */  public class PageBean<T> {      private int pageIndex;//当前页数      private int pageSize;//一共的页数      private int count;//数据条数      private int pageCount;//每页的数据条数      private int start;//起始数据位置      private int end;//结束      private List<T> list=null;        public void init(){          /*根count 和pageCount计算页数pageSize           */          int pageSize_x=(int)count/pageCount;          if(count>=pageCount){              this.pageSize=count%pageCount==0?pageSize_x:pageSize_x+1;          }else{              this.pageSize=1;          }          //判断页数和当前页数          if(pageIndex>pageSize){              pageIndex=pageSize;          }          if(pageIndex<1){              pageIndex=1;          }          //根据当前页计算起始和结束条目          this.start=(pageIndex-1)*pageCount+1;          this.end=pageIndex*pageCount;      }        public PageBean(int pageIndex, int count, int pageCount) {          super();          this.pageIndex = pageIndex;          this.count = count;          this.pageCount = pageCount;      }        public PageBean(int pageIndex, int count, int pageCount, List<T> list) {          super();          this.pageIndex = pageIndex;          this.count = count;          this.pageCount = pageCount;          this.list = list;      }        public PageBean() {          super();          // TODO Auto-generated constructor stub      }      @Override      public String toString() {          return "PageBean [count=" + count + ", end=" + end + ", list=" + list                  + ", pageCount=" + pageCount + ", pageIndex=" + pageIndex                  + ", pageSize=" + pageSize + ", start=" + start + "]";      }      public int getPageIndex() {          return pageIndex;      }      public void setPageIndex(int pageIndex) {          this.pageIndex = pageIndex;      }      public int getPageSize() {          return pageSize;      }      public void setPageSize(int pageSize) {          this.pageSize = pageSize;      }      public int getCount() {          return count;      }      public void setCount(int count) {          this.count = count;      }      public int getPageCount() {          return pageCount;      }      public void setPageCount(int pageCount) {          this.pageCount = pageCount;      }      public int getStart() {          return start;      }      public void setStart(int start) {          this.start = start;      }      public int getEnd() {          return end;      }      public void setEnd(int end) {          this.end = end;      }      public List<T> getList() {          return list;      }      public void setList(List<T> list) {          this.list = list;      }    }  

servlet调用

import java.io.IOException;    import javax.servlet.ServletException;  import javax.servlet.http.HttpServlet;  import javax.servlet.http.HttpServletRequest;  import javax.servlet.http.HttpServletResponse;    import com.dao.MessageDao;  import com.dao.impl.MessageDaoImpl;  import com.vo.Message;  import com.vo.PageBean;    public class ShowMessageServlet extends HttpServlet{        /**       *        */      private static final long serialVersionUID = 6646899131087204214L;        @Override      protected void doPost(HttpServletRequest req, HttpServletResponse resp)              throws ServletException, IOException {          doGet(req, resp);      }      @Override      protected void doGet(HttpServletRequest req, HttpServletResponse resp)              throws ServletException, IOException {          req.setCharacterEncoding("UTF-8");          resp.setContentType("text/html;charset=utf-8");          int pageIndex=0;          MessageDao md=new MessageDaoImpl();          String pageIndexStr=req.getParameter("pageIndex");          if(pageIndexStr!=null){              try{                  pageIndex=Integer.parseInt(pageIndexStr);              }catch (Exception e) {              }          }          PageBean<Message> pb=new PageBean<Message>(pageIndex,md.getMessageCount(),10);          pb.init();          pb.setList(md.getMessageListOfPage(pb.getStart(), pb.getEnd()));          req.setAttribute("pagebean", pb);          req.getRequestDispatcher("index.jsp").forward(req, resp);      }  }  

jsp页面的显示调用

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>  <%  String path = request.getContextPath();  String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";  %>    <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>  <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">  <html>    <head>      <base href="<%=basePath%>">        <title>My JSP 'index.jsp' starting page</title>      <meta http-equiv="pragma" content="no-cache">      <meta http-equiv="cache-control" content="no-cache">      <meta http-equiv="expires" content="0">          <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">      <meta http-equiv="description" content="This is my page">      <!--      <link rel="stylesheet" type="text/css" href="styles.css">      -->    </head>    <c:if test="${empty pagebean}">      <jsp:forward page="showmessage"></jsp:forward>    </c:if>    <body>      <c:forEach var="message" items="${pagebean.list}">          ${message.title }   ${message.editdate }<br/>      </c:forEach>      <a href="showmessage?pageIndex=${pagebean.pageIndex+1}">下一个</a>[${pagebean.pageIndex }<span>/</span>${pagebean.pageSize}]    </body>  </html>