jdbc：客戶信息管理案例：頁面數據封裝和公用頁面處理類

數據封裝：

public class Page {
 private int pageNum;//當前頁碼    傳入
 private int pageSize=5;//每頁顯示的記錄條數   
 private int totalPage;//總頁數      計算
 private int startIndex; //當前頁碼開始的索引  計算
 private List records;//每頁顯示的記錄  dao
 private int totalRecords;//總記錄條數  dao
 private String servletUrl;
 public Page(int pageNum,int totalRecords){
  this.pageNum=pageNum;
  this.totalRecords=totalRecords;
  totalPage=totalRecords%pageSize==0?totalRecords/pageSize:totalRecords/pageSize+1;
  startIndex=(pageNum-1)*pageSize;
 }
 public int getPageNum() {
  return pageNum;
 }
 public String getServletUrl() {
  return servletUrl;
 }
 public void setServletUrl(String servletUrl) {
  this.servletUrl = servletUrl;
 }
 public void setPageNum(int pageNum) {
  this.pageNum = pageNum;
 }
 public int getPageSize() {
  return pageSize;
 }
 public void setPageSize(int pageSize) {
  this.pageSize = pageSize;
 }
 public int getTotalPage() {
  return totalPage;
 }
 public void setTotalPage(int totalPage) {
  this.totalPage = totalPage;
 }
 public int getStartIndex() {
  return startIndex;
 }
 public void setStartIndex(int startIndex) {
  this.startIndex = startIndex;
 }
 public List getRecords() {
  return records;
 }
 public void setRecords(List records) {
  this.records = records;
 }
 public int getTotalRecords() {
  return totalRecords;
 }
 public void setTotalRecords(int totalRecords) {
  this.totalRecords = totalRecords;
 }
}

公用頁面：

page.jsp:

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
   第${page.pageNum}頁 &nbsp;&nbsp;共${page.totalPage}頁
      <a href="${pageContext.request.contextPath }/servlet/Controller?op=showAllCustomers&num=1">首頁</a>
      <a href="${pageContext.request.contextPath }/servlet/Controller?op=showAllCustomers&num=${page.pageNum-1<1?1:page.pageNum-1}">上一頁</a>
      <a href="${pageContext.request.contextPath }/servlet/Controller?op=showAllCustomers&num=${page.pageNum+1>page.totalPage?page.totalPage:page.pageNum+1}">下一頁</a>
      <a href="${pageContext.request.contextPath }/servlet/Controller?op=showAllCustomers&num=${page.totalPage}">尾頁</a>
      <input type="text" name="num" id="num" value="${page.pageNum}" />
      <a href="javascript:jump()">跳轉</a>
 
     <!-- 下拉方式跳轉頁碼
    <select name="num" id="id" onchange="jump(this)">
       <c:forEach begin="1" end="${page.totalPage}" var="n">
        <option value="${n}">${n}</option>
       </c:forEach>
      </select>
    <script type="text/javascript">
     function jump(selectObj){
      window.location.href="${pageContext.request.contextPath }/servlet/Controller?op=showAllCustomers&num="+selectObj.value;
     }
    </script>
      -->
    <script type="text/javascript">
     function jump(){
      var num=document.getElementById("num").value;
      var regObj=new RegExp("[1-9][0-9]*");
      if(!regObj.test(num)){
       alert("請輸入天然整數");
       return;
      }
      if(num>${page.totalPage}){
       alert("超出範圍");
       return;
      }
      window.location.href="${pageContext.request.contextPath }/servlet/Controller?op=showAllCustomers&num="+num;
     }
    </script>