Java分页查询--分页显示(实例讲解)

public class Page<T> {
  private List<T> data;//数据列表
  private int pagenum;//当前页数
  private int pagesize;//当前页显示条数
  private int rows;//总行数
  public Page(int rows,int pagenum, int pagesize) {
    super();
    data=new ArrayList<>();
    this.rows=rows;
    this.setPagesize(pagesize);
    this.setPagenum(pagenum);    
  }
  public Page() {
    super();
  }
  public int getPagenum() {
    return pagenum;
  }
  public void setPagenum(int pagenum) {
    if(pagenum>getTotalpage())
    {
      this.pagenum=getTotalpage();
    }
    else {
      this.pagenum = pagenum;
    }  
    if(pagenum<1)
    {
      this.pagenum=1;
    }
  }
  public int getPagesize() {
    return pagesize;
  }
  public void setPagesize(int pagesize) {
    this.pagesize = pagesize;
  }
  public int getTotalpage() {
    //计算总页数
    if(rows%pagesize==0)
    {
      return rows/pagesize;
    }
    else {
      return rows/pagesize+1;
    }    
  }
  public int getRows() {
    return rows;
  }
  public void setRows(int rows) {
    this.rows = rows;
  }
  public int getIndexnum() {
    //获取索引值
    return pagesize*(pagenum-1);
  }
  public List<T> getData() {
    return data;
  }
  public void setData(List<T> data) {
    this.data = data;
  }
}

<div>
    <a href="/stuent8.11/stuServlet?pagenum=1" rel="external nofollow" >首页</a>
    <a href="/stuent8.11/stuServlet?pagenum=${apage.pagenum-1 }" rel="external nofollow" >上一页</a>
    <c:choose>
      <c:when test="${apage.totalpage<=5 }">
        <c:set var="begin" value="1"></c:set>
        <c:set var="end" value="${apage.totalpage }"></c:set>
      </c:when>
      <c:when test="${apage.totalpage>5 }">
        <c:set var="begin" value="1"></c:set>
        <c:set var="end" value="5"></c:set>
        <c:if test="${apage.pagenum>3 }">
          <c:set var="begin" value="${apage.pagenum-2 }"></c:set>
          <c:set var="end" value="${apage.pagenum+2 }"></c:set>
        </c:if>
        <c:if test="${end>apage.totalpage }">
          <c:set var="begin" value="${apage.totalpage-4 }"></c:set>
          <c:set var="end" value="${apage.totalpage }"></c:set>
        </c:if>
      </c:when>
    </c:choose>
    <c:forEach begin="${begin }" end="${end }" step="1" var="num">
      <c:if test="${apage.pagenum==num }">
        [${num }]
      </c:if>
      <c:if test="${apage.pagenum!=num }">
        <a href="/stuent8.11/stuServlet?pagenum=${num }" rel="external nofollow" >${num }</a>  
      </c:if>
    </c:forEach>
    <a href="/stuent8.11/stuServlet?pagenum=${apage.pagenum+1 }" rel="external nofollow" >下一页</a>
    <a href="/stuent8.11/stuServlet?pagenum=${apage.totalpage }" rel="external nofollow" >末页</a>
  </div>