实用分页小方法

1 编辑一个class：包含当前页面、总条数、每页显示的条数的属性和构造方法。

  具体代码如下：

public class PageUtilServices {
    private int pageSize;//每页显示的条数
    private int recordCount;//总共的条数
    private int currentPage;//当前页面
    //构造方法
    public PageUtilServices(int pageSize, int recordCount, int currentPage) {
        super();
        this.pageSize = pageSize;
        this.recordCount = recordCount;
        this.currentPage = currentPage;
    }
    public PageUtilServices() {
        super();
    }
      
        //总页数
        public int getPageCount() {
            int size = recordCount/pageSize;//总条数/每页显示的条数=总页数
            int mod = recordCount % pageSize;//最后一页的条数
            if(mod != 0)
                size++;
            return recordCount == 0 ? 1 : size;
        }
        //当前页的起始索引为0
        public int getFromIndex() {
            return (currentPage-1) * pageSize;
        }
        //当前页应展示的最后索引
        public int getToIndex() {
            return  Math.min(recordCount, currentPage * pageSize);
        }
       
        public int getCurrentPage() {
            return currentPage;
        }
        public void setCurrentPage(int currentPage) {
           
            this.currentPage = currentPage;
        }
        public int getPageSize() {
            return pageSize;
        }
        public void setPageSize(int pageSize) {
            this.pageSize = pageSize;
        }
        public int getRecordCount() {
            return recordCount;
        }
        public void setRecordCount(int recordCount) {
            this.recordCount = recordCount;
        }
}

2.在jsp内实例化该class，并调用相关属性和方法。具体代码如下：

  
     <% BookInfoDAO  dao=new BookInfoDAO();
       SimpleDateFormat sdf=new  SimpleDateFormat("yyyy-MM-dd");
       List<Book> books=dao.getAllBook();
       
       
       String pageStr = request.getParameter("page");
      int  current_size=10;
      int currentPage = 1;
      if (pageStr==null){  
          currentPage = 1;
      }else if(Integer.parseInt(pageStr)<=0){
          currentPage = 1;
      }else if(Integer.parseInt(pageStr)>books.size()/current_size){
          currentPage =books.size()/current_size+1;
      }else{
          currentPage=Integer.parseInt(pageStr);
      }
      PageUtilServices pUtil = new PageUtilServices(current_size, books.size(), currentPage);
      currentPage = pUtil.getCurrentPage();    %>
    <table border="1px">
       <tr><td>bookId</td>
           <td>Name</td>
           <td>author</td>
           <td>price</td>
           <td>date</td>
          
           <td>修改</td>
           <td>删除</td>
      </tr>
      <%for(int i = pUtil.getFromIndex(); i < pUtil.getToIndex();i++){ %>
      <tr><td><%=books.get(i).getBookId()%></td>
          <td><%=books.get(i).getName() %></td>
          <td><%=books.get(i).getAuthor() %></td>
          <td><%=books.get(i).getPrice() %></td>
          <td><%=sdf.format(books.get(i).getDate()) %></td>
      
          <td><a href="servlet/do_upDateBookServlet?id=<%=books.get(i).getBookId() %>">修改</a></td>
          <td><a href="servlet/do_delBookServlet?id=<%=books.get(i).getBookId() %>">删除</a></td>
        
             
      </tr>
  <%}%>
  <tr><td bgcolor="#eeeeee" colspan=13 align="center">
                    记录总数<%=pUtil.getRecordCount()%>条 当前页/总页数<%=currentPage%>
                    /<%=pUtil.getPageCount()%> 每页显示<%=pUtil.getPageSize()%>条
                    <a href="bookList.jsp?page=1">首页</a>
                    <a href="bookList.jsp?page=<%=(currentPage - 1)%>">上页</a>
                    <a href="bookList.jsp?page=<%=(currentPage + 1)%>">下页</a>
                    <a href="bookList.jsp?page=<%=pUtil.getPageCount()%>">末页</a>
                    </td></tr>
    </table>

红线部分表示该class的具体使用地方。页面效果：