Java中的分页实现

1,创建分页的实体类: 然后获得其属性的get和set方法   需要注意的是getTotalPage()方法需要修改下,计算出总页数

   public class UtilPage {

   publicint totalPage;// 总页数

   publicint rowsCount;// 总条数

   publicint currentPage;// 当前页数

   public final int pageSize= 3;// 页面显示条数

   publicint getTotalPage() {

      if(rowsCount% pageSize == 0) {

         totalPage= (rowsCount/ pageSize);

      }else {

         totalPage= (rowsCount/ pageSize + 1);

      }

      returntotalPage;

   }

 2,在Dao层中创建两个接口,然后再实现:  获取需要分页的数据(这个没啥难的)

       publicList<Customer> getCustomer(intcurrentPage,int pageSize) {

      List<Customer>list = newArrayList<>(0);

      ct= JDUtil.getConnection();

      Stringsql = "select * from t_customer c INNER JOIN t_dict d on c.custLevel=d.didlimit ?,?";

      try{

         ps= ct.prepareStatement(sql);

         ps.setInt(1, (currentPage-1)*pageSize);

         ps.setInt(2,pageSize);

         rs= ps.executeQuery();

         while(rs.next()) {

        代码

         }

      }catch (Exception e) {

         e.printStackTrace();

      }finally{

         JDUtil.closeAll(ct,ps,rs);

      }

      returnlist;

   }

  //获取查询数据的总条数

   publicint selectRowsCount() {

      introwsCount=0;

      ct= JDUtil.getConnection();

      Stringsql = "select count(*) from t_customer";

      try{

         ps=ct.prepareStatement(sql);

         rs=ps.executeQuery();

         while(rs.next()){

            rowsCount=rs.getInt(1); 

         }

      }catch (Exception e) {

         e.printStackTrace();

      }finally{

         JDUtil.closeAll(ct,ps,rs);

      }

      returnrowsCount;

   }

}

3,在service层中建立接口并实现:(我这是建立一个Map集合,一起存储需要分页的数据和数据总条数,也可以单独实现)

 publicMap<String, Object> getLimitCustomer(intcurrentPage,int pageSize) {

      Map<String,Object>map=newHashMap<>();

      List<Customer>list = cd.getCustomer(currentPage,pageSize);

      introwsCount = cd.selectRowsCount();

      map.put("list",list);

      map.put("rowsCount",rowsCount);

      returnmap;

   }

4,在control层中进行具体的Servlet处理

      UtilPageutilPage = newUtilPage();(这个是分页实体类对象)

      //获取当前页面

      intcurrentPage = Integer.parseInt(request.getParameter("currentPage"));

      Map<String, Object>limitCustomer = cs.getLimitCustomer(currentPage,utilPage.getPageSize());(利用对象调用service层的方法)

      //获取客户集合

      List<Customer>list =(List<Customer>)limitCustomer.get("list");

      introwsCount =(int)limitCustomer.get("rowsCount");

      //将当前页面和总数据条数赋给对象

      utilPage.setRowsCount(rowsCount);

      utilPage.setCurrentPage(currentPage);

      request.setAttribute("utilPage",utilPage);

      request.setAttribute("list",list);

       //请求转发

       try{

         request.getRequestDispatcher("WEB-INF/customer/limitPage.jsp").forward(request,response);

      }catch (Exception e) {

         //TODOAuto-generated catch block

         e.printStackTrace();

      }

   5, 下边就是请求转发到所需要的jsp页面中的分页栏

    共[<fontcolor="red"><B>${utilPage.rowsCount}</B></font>]条记录，共[<fontcolor="red"><B>${utilPage.totalPage}</B></font>]页，当前第[<fontcolor="red">              <B>${utilPage.currentPage}</B></font>]页

               <c:iftest="${utilPage.currentPage!=1}">

               [<B><ahref="Customer?C=getLimitCustomer&currentPage=1">首页</a></B>]

               [<B><ahref="Customer?C=getLimitCustomer&currentPage=${utilPage.currentPage-1}">前一页</a></B>]

               </c:if>

               <c:iftest="${utilPage.currentPage!=utilPage.totalPage}">

               [<B><ahref="Customer?C=getLimitCustomer&currentPage=${utilPage.currentPage+1}">后一页</a></B>]

               [<B><ahref="Customer?C=getLimitCustomer&currentPage=${utilPage.currentPage=utilPage.totalPage}">尾页</a></B>]

               </c:if>

这是主要的实现思想和代码,只要有web基础的都能看明白啥意思,不是完整的程序!!!