客户信息管理系统4—客户信息的查询
2、功能二:客户信息的查询
（1）查询的流程
（2）实现代码
2.1代码组成
index.jsp+ findAllCustomer.jsp+ FindAllServlet +CustomersService + CustomersDao+ CustomersDaoImplement
2.2代码功能介绍
【1】index.jsp：查询入口页面
【2】findAllCustomer.jsp：查询结果显示页面
【3】FindAllServlet：查询客户信息web层
【4】CustomersService ：业务层（selectAll方法）
【5】CustomersDao：dao接口层（selectAll方法）
【6】CustomersDaoImplement：dao结构层实现类（selectAll方法）
2.3代码详细
2.3.1 index.jsp：查询入口页面
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" >
<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" >
-->
</head>
<body>
<a href="/customer_system/addCustomer.jsp" target="_blank" rel="external nofollow" >添加客户信息</a><br/>
<a href="/customer_system/FindAllServlet" target="_blank" rel="external nofollow" >查询所有客户信息</a><br/>
<a href="/customer_system/PageQueryServlet?currentPage=1" target="_blank" rel="external nofollow" >查询第一页的客户信息</a><br/>
</body>
</html>
2.3.2 findAllCustomer.jsp：查询结果显示页面
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" >
<title>My JSP 'findAllCustomer.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" >
-->
<script>
//删除确认对话框
function confirm_deleteOne(id) {
// alert(id);
var message=confirm("你确定要删除这条记录吗？");
if(message==true){
// window.location("/customer_system/DeleteOneServlet?id="+id);//错误【使用错误，是等号=，不是括号（）】
// window.location="/customer_system/DeleteOneServlet?id="+id;//正确
// document.location.herf="/customer_system/DeleteOneServlet?id="+id;//错误[拼写错误]
window.location.href="/customer_system/DeleteOneServlet?id=" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" +id;//正确
// document.location.href="/customer_system/DeleteOneServlet?id=" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" +id;//正确
// document.location="/customer_system/DeleteOneServlet?id="+id;//正确
}
}
//全选或者全不选
function checkAll(){
//id="chooseFirst" 如果选中，下面的checkbox全部被选中
var chooseAll=document.getElementsByName("choose");//全部choose
var choose=document.getElementById("chooseFirst");//第一个choose
//选中状态：checked可以为true或者false
if(choose.checked){
for(var i=0;i<chooseAll.length;i++){
chooseAll[i].checked=true;
}
}
//id="chooseFirst" 如果没有选中，下面的checkbox全部不选中
else{
for(var i=0;i<chooseAll.length;i++){
chooseAll[i].checked=false;
}
}
}
</script>
</head>
<body>
<h1 align="center">客户信息查询列表</h1>
<form action="/customer_system/SelectConditionServlet" method="post">
<table align="center">
<tr>
<td>
<select name="conditionName">
<option value="name"
<c:if test="${param.conditionName=='name' }">
selected="selected"
</c:if>
>按姓名查询</option>
<option value="cellphone"
<c:if test="${param.conditionName=='cellphone' }">
selected="selected"
</c:if>
>按手机号码查询</option>
<option value="description"
<c:if test="${param.conditionName=='description' }">
selected="selected"
</c:if>
>按描述查询</option>
</select>
</td>
<td><input type="text" name="keyWords" value="${param.keyWords }"></td>
<td><input type="submit" value="查询"></td>
</tr>
</table>
</form>
<form action="/customer_system/DeleteAllServlet" method="post">
<table align="center">
<tr>
<!-- <td>编号</td> -->
<td>选中状态<input type="checkbox" name="choose" id="chooseFirst" οnclick="checkAll()"></td>
<td>客户姓名</td>
<td>性别</td>
<td>生日</td>
<td>手机</td>
<td>电子邮件</td>
<td>客户爱好</td>
<td>客户类型</td>
<td>备注</td>
<td>状态</td>
</tr>
<c:forEach var="customer" items="${CustomersList }">
<tr>
<!-- <td>${customer.id }</td> -->
<td><input type="checkbox" name="choose" value="${customer.id }"></td>
<td>${customer.name }</td>
<td>${customer.gender }</td>
<td>${customer.birthday }</td>
<td>${customer.cellphone }</td>
<td>${customer.email }</td>
<td>${customer.preference }</td>
<td>${customer.type }</td>
<td>${customer.description }</td>
<!-- <td><a href="/customer_system/DeleteOneServlet?id=${customer.id }" target="_blank" rel="external nofollow" >删除</a></td> -->
<td><a href="javascript:void(0)" target="_blank" rel="external nofollow" οnclick="confirm_deleteOne('${customer.id}')">删除</a>
<a href="/customer_system/GetUpdateInfoServlet?id=${customer.id }" target="_blank" rel="external nofollow" >修改</a>
</td>
</tr>
</c:forEach>
</table>
<div align="center"><input type="submit" value="多选删除提交按钮" ></div>
</form>
</body>
</html>
2.3.3 FindAllServlet：查询客户信息web层
package com.zhku.jsj144.zk.web;
import java.io.IOException;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.zhku.jsj144.zk.service.CustomersService;
public class FindAllServlet extends HttpServlet {
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
//查询所有用户信息
req.setCharacterEncoding("utf-8");//设置编码，防止中文乱码
CustomersService customerService=new CustomersService();//业务层对象
List resultList=customerService.selectAll();//查询结果集
///保存查询结果，转发到客户信息查询显示页面
req.setAttribute("CustomersList", resultList);
req.getRequestDispatcher("/findAllCustomer.jsp").forward(req, resp);//转发到查询客户信息页面
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
doPost(req, resp);
}
}
2.3.4 CustomersService ：业务层（selectAll方法）
详细看功能一代码实现，已经写好了
2.3.5 CustomersDao：dao接口层（selectAll方法）
详细看功能一代码实现，已经写好了
2.3.6 CustomersDaoImplement：dao结构层实现类（selectAll方法）
详细看功能一代码实现，已经写好了
项目详细代码资源:
本人的github项目地址
https://github.com/Forever99/customer_system
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