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package cn.itcast.customer.web.servlet;

import java.io.IOException;
import java.sql.SQLException;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import cn.itcast.customer.domain.Customer;
import cn.itcast.customer.domain.PageBean;
import cn.itcast.customer.service.CustomerService;

public class CustomerFindAllByPageServlet extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

System.out.println(request.getRemoteAddr());

// 1.默认访问第一页
int pageNum = 1;

       String _pageNum = request.getParameter("pageNum");
       if (_pageNum != null) {
           pageNum = Integer.parseInt(_pageNum);
       }

// 2.每页条数人为定义
int currentPage = 5;

       String _currentPage = request.getParameter("currentPage");
       if (_currentPage != null) {
           currentPage = Integer.parseInt(_currentPage);
       }

// 3.调用service,完成查询当前页数据操作
CustomerService service = new CustomerService();

try {
PageBean pb = service.findByPage(pageNum, currentPage);

// 4.将数据存储到request域，请求转到到页面展示。

request.setAttribute("pb", pb);

           request.getRequestDispatcher("/showCustomerByPage.jsp").forward(
                   request, response);
           return;
       } catch (SQLException e) {
           e.printStackTrace();
       }

}

   public void doPost(HttpServletRequest request, HttpServletResponse response)
           throws ServletException, IOException {
       doGet(request, response);
   }

}

showCustomerByPage.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>

<%@taglib prefix="my" uri="http://www.itcast.cn/tag"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>

<title>My JSP 'index.jsp' starting page</title>

location.href = "/day20_1/findAllByPage?currentPage=" + value;
};
</script>
</head>

<body>

   <c:if test="${empty pb.cs}">
       无客户信息
   </c:if>

<c:if test="${not empty pb.cs}">

</tr>

<c:forEach items="${pb.cs}" var="c">
<tr>

                   <td>${c.id }</td>
                   <td>${c.name}</td>
                   <td>${c.gender }</td>
                   <td>${c.birthday }</td>
                   <td>${c.cellphone }</td>
                   <td>${c.email }</td>
                   <td>${c.preference }</td>
                   <td>${c.type }</td>
                   <td>${c.description }</td>

               </tr>
           </c:forEach>
           <tr>
               <td colspan="9" align="center"><a
                   href="/day20_1/findAllByPage?pageNum=1&currentPage=${pb.currentPage}">首页</a>   

                   <c:if test="${pb.pageNum==1}">
                           上一页   
                       </c:if> <c:if test="${pb.pageNum!=1}">
                       <a
                           href="/day20_1/findAllByPage?pageNum=${pb.pageNum-1}&currentPage=${pb.currentPage}">上一页</a>   
                       </c:if> <c:if test="${pb.pageNum==pb.totalPage}">
                           下一页   
                       </c:if> <c:if test="${pb.pageNum!=pb.totalPage}">
                       <a
                           href="/day20_1/findAllByPage?pageNum=${pb.pageNum+1 }&currentPage=${pb.currentPage}">下一页</a>   
                       </c:if> <a
                   href="/day20_1/findAllByPage?pageNum=${pb.totalPage }&currentPage=${pb.currentPage}">尾页</a>   

                   <select name="currentPage"
                   οnchange="changeCurrentPage(this.value);">
                       <option>--请选择每页条数--</option>
                       <option value="5">5</option>
                       <option value="10">10</option>
                       <option value="20">20</option>
               </select>
               </td>

           </tr>
           <tr>
               <td colspan="9" align="center"><c:forEach begin="1"
                       end="${pb.totalPage}" var="n" step="1">
                       <c:if test="${n==pb.pageNum}">
                           <a
                               href="/day20_1/findAllByPage?pageNum=${n}&currentPage=${pb.currentPage}"><font
                               color='red'>第${n}页</font> </a>  
                           </c:if>

                       <c:if test="${n!=pb.pageNum}">
                           <a
                               href="/day20_1/findAllByPage?pageNum=${n}&currentPage=${pb.currentPage}">第${n}页</a>  

                               </c:if>
                   </c:forEach>
               </td>
           </tr>
           <tr>
               <td colspan="9" align="center"><my:page pb="${pb}" />
               </td>
           </tr>
       </table>
   </c:if>

</body>
</html>

来源：CSDN

作者：live801

链接：https://blog.csdn.net/live801/article/details/103951541

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