【JavaWeb】网上蛋糕商城后台-客户管理-编程知识

概念

上文中已讲解和实现了后台管理系统中的订单管理功能，本文讲解客户信息管理功能。

客户信息列表

在后台管理系统的head.jsp头部页面中点击“客户管理”向服务器发送请求

在servlet包中创建AdminUserListServlet类接收浏览器的请求

package servlet;import model.Page;
import service.UserService;import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;@WebServlet(name = "admin_user_list",urlPatterns = "/admin/user_list")
public class AdminUserListServlet extends HttpServlet {private UserService uService = new UserService();/*** @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)*/protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {int pageNumber = 1;if(request.getParameter("pageNumber") != null) {try {pageNumber=Integer.parseInt(request.getParameter("pageNumber") ) ;}catch (Exception e){}}if(pageNumber<=0)pageNumber=1;Page p = uService.getUserPage(pageNumber);if(p.getTotalPage()==0){p.setTotalPage(1);p.setPageNumber(1);}else {if(pageNumber>=p.getTotalPage()+1){p = uService.getUserPage(pageNumber);}}request.setAttribute("p", p);request.getRequestDispatcher("/admin/user_list.jsp").forward(request, response);}@Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {this.doGet(req, resp);}
}

以上代码中，接收浏览器的请求后，并获得浏览器的页码参数，如果没有，则默认页码为1，然后根据页码传递给业务逻辑层执行操作

public Page getUserPage(int pageNumber) {Page p = new Page();p.setPageNumber(pageNumber);int pageSize = 7;int totalCount = 0;try {totalCount = uDao.selectUserCount();} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}p.SetPageSizeAndTotalCount(pageSize, totalCount);List list=null;try {list = uDao.selectUserList( pageNumber, pageSize);} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}p.setList(list);return p;
}

以上代码中，先调用dao数据访问层获得所有用户信息的总数量，然后根据页码以及每页显示的记录数作为条件查询用户表，获得用户列表信息

public int selectUserCount() throws SQLException {QueryRunner r = new QueryRunner(DataSourceUtils.getDataSource());String sql = "select count(*) from user";return r.query(sql, new ScalarHandler<Long>()).intValue();
}

public List selectUserList(int pageNo, int pageSize) throws SQLException {QueryRunner r = new QueryRunner(DataSourceUtils.getDataSource());String sql = "select * from user limit ?,?";return r.query(sql, new BeanListHandler<User>(User.class), (pageNo-1)*pageSize,pageSize );
}

最后将查询的用户列表信息发送给user_list.jsp页面显示

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<html>
<head>
<title>客户列表</title>
<meta charset="utf-8"/>
<link rel="stylesheet" href="css/bootstrap.css"/> 
</head>
<body>
<div class="container-fluid"><jsp:include page="header.jsp"></jsp:include><div class="text-right"><a class="btn btn-warning" href="user_add.jsp">添加客户</a></div><c:if test="${!empty msg }"><div class="alert alert-success">${msg }</div></c:if><c:if test="${!empty failMsg }"><div class="alert alert-danger">${failMsg }</div></c:if><br><br><table class="table table-bordered table-hover"><tr><th width="5%">ID</th><th width="10%">用户名</th><th width="10%">邮箱</th><th width="10%">收件人</th><th width="10%">电话</th><th width="10%">地址</th><th width="12%">操作</th></tr><c:forEach items="${p.list }" var="u"><tr><td><p>${u.id }</p></td><td><p>${u.username }</p></td><td><p>${u.email }</p></td><td><p>${u.name }</p></td><td><p>${u.phone }</p></td><td><p>${u.address }</p></td><td><a class="btn btn-info" href="/admin/user_reset.jsp?id=${u.id }&username=${u.username }&email=${u.email }">重置密码</a><a class="btn btn-primary" href="/admin/user_editshow?id=${u.id }">修改</a><a class="btn btn-danger" href="${pageContext.request.contextPath }/admin/user_delete?id=${u.id }">删除</a></td></tr></c:forEach>
</table><br><jsp:include page="/page.jsp"><jsp:param value="/admin/user_list" name="url"/></jsp:include>
<br>
</div>
</body>
</html>

添加客户信息

点击上图右上角“添加客户按钮”跳转至user_add.jsp添加客户页面

<%@ page language="java" contentType="text/html; charset=utf-8"pageEncoding="utf-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE html>
<html>
<head><title>客户添加</title><meta charset="utf-8" /><link rel="stylesheet" href="css/bootstrap.css" />
</head>
<body>
<div class="container-fluid"><jsp:include page="/admin/header.jsp"></jsp:include><c:if test="${!empty failMsg }"><div class="alert alert-danger">${failMsg }</div></c:if><br><br><form class="form-horizontal" action="/admin/user_add" method="post"><div class="form-group"><label for="input_name" class="col-sm-1 control-label">用户名</label><div class="col-sm-6"><input type="text" class="form-control" id="input_name" name="username" required="required" value="${u.username }" /></div></div><div class="form-group"><label for="input_name" class="col-sm-1 control-label">邮箱</label><div class="col-sm-6"><input type="text" class="form-control" id="input_name" name="email" required="required" value="${u.email }"/></div></div><div class="form-group"><label for="input_name" class="col-sm-1 control-label">密码</label><div class="col-sm-6"><input type="text" class="form-control" id="input_name" name="password" required="required" value="${u.password }"/></div></div><div class="form-group"><label for="input_name" class="col-sm-1 control-label">收货人</label><div class="col-sm-6"><input type="text" class="form-control" id="input_name" name="name" value="${u.name }"/></div></div><div class="form-group"><label for="input_name" class="col-sm-1 control-label">电话</label><div class="col-sm-6"><input type="text" class="form-control" id="input_name" name="phone" value="${u.phone }" /></div></div><div class="form-group"><label for="input_name" class="col-sm-1 control-label">地址</label><div class="col-sm-6"><input type="text" class="form-control" id="input_name" name="address" value="${u.address }"/></div></div><div class="form-group"><div class="col-sm-offset-1 col-sm-10"><button type="submit" class="btn btn-success">提交保存</button></div></div></form><span style="color:red;"></span>
</div>
</body>
</html>

当管理员录入完客户信息后，点击“提交保存”按钮，将新增客户数据发送给服务器/admin/user_add

在servlet包中创建AdminUserAddServlet类接收新增客户信息

package servlet;import model.User;
import org.apache.commons.beanutils.BeanUtils;
import service.UserService;import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;@WebServlet(name = "admin_user_add",urlPatterns = "/admin/user_add")
public class AdminUserAddServlet extends HttpServlet {private UserService uService = new UserService();/*** @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)*/protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {User user = new User();try {BeanUtils.copyProperties(user, request.getParameterMap());} catch (IllegalAccessException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (InvocationTargetException e) {// TODO Auto-generated catch blocke.printStackTrace();}if(uService.register(user)) {request.setAttribute("msg", "客户添加成功！");request.getRequestDispatcher("/admin/user_list").forward(request, response);}else {request.setAttribute("failMsg", "用户名或邮箱重复，请重新填写！");request.setAttribute("u",user);request.getRequestDispatcher("/admin/user_add.jsp").forward(request, response);}}
}

以上代码中，将浏览器发送的数据以map集合的格式接收，并封装至user对象中，并发送给业务逻辑层执行添加客户信息操作，如果添加成功则刷新客户列表信息页面，否则返回添加客户页面，告知管理员添加失败的原因，重新录入客户信息。

重置客户密码

在客户列表页面中，选择要重置密码的客户信息的“重置密码”按钮，携带数据跳转至user_reset.jsp页面

<%@ page language="java" contentType="text/html; charset=utf-8"pageEncoding="utf-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE html>
<html>
<head><title>重置密码</title><meta charset="utf-8"/><link rel="stylesheet" href="css/bootstrap.css"/>
</head>
<body>
<div class="container-fluid"><jsp:include page="/admin/header.jsp"></jsp:include><br><br><form class="form-horizontal" action="/admin/user_reset" method="post"><input type="hidden" name="id" value="${param.id }"><div class="form-group"><label for="input_name" class="col-sm-1 control-label">用户名</label><div class="col-sm-5">${param.username }</div></div><div class="form-group"><label for="input_name" class="col-sm-1 control-label">邮箱</label><div class="col-sm-5">${param.email }</div></div><div class="form-group"><label for="input_name" class="col-sm-1 control-label">密码</label><div class="col-sm-6"><input type="text" class="form-control" id="input_name" name="password" value="" required="required"></div></div><div class="form-group"><div class="col-sm-offset-1 col-sm-10"><button type="submit" class="btn btn-success">提交修改</button></div></div></form><span style="color:red;"></span>
</div>
</body>
</html>

当管理员填写新密码后，点击提交修改按钮，向服务器发送请求/admin/user_reset

在servlet包中创建AdminUserResetServlet类，完成重置密码操作

package servlet;import model.User;
import org.apache.commons.beanutils.BeanUtils;
import service.UserService;import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;@WebServlet(name = "admin_user_reset",urlPatterns = "/admin/user_reset")
public class AdminUserResetServlet extends HttpServlet {private UserService uService = new UserService();/*** @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)*/protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {User u = new User();try {BeanUtils.copyProperties(u, request.getParameterMap());} catch (IllegalAccessException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (InvocationTargetException e) {// TODO Auto-generated catch blocke.printStackTrace();}uService.updatePwd(u);request.getRequestDispatcher("/admin/user_list").forward(request, response);}
}

以上代码中，将接收的用户信息发送给业务逻辑层进行密码的修改，修改成功后刷新客户列表页面

修改客户信息

点击客户列表页面中，要修改的客户中的“修改”按钮，向服务器发送请求/admin/user_editshow并携带客户编号

在servlet包中创建AdminUserEditshowServlet类，接收浏览器请求，根据客户编号查询该客户的信息

package servlet;import model.User;
import service.UserService;import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;@WebServlet(name = "admin_user_editshow",urlPatterns = "/admin/user_editshow")
public class AdminUserEditshowServlet extends HttpServlet {private UserService uService = new UserService();/*** @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)*/protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {int id = Integer.parseInt(request.getParameter("id"));User user = uService.selectById(id);request.setAttribute("u", user);request.getRequestDispatcher("/admin/user_edit.jsp").forward(request, response);}
}

将客户编号发送给业务逻辑层执行

public User selectById(int id) {User u=null;try {u = uDao.selectById(id);} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}return u;
}

以上代码中，将接收的客户编号发送给数据访问层查询客户信息

public User selectById(int id) throws SQLException {QueryRunner r = new QueryRunner(DataSourceUtils.getDataSource());String sql = "select * from user where id=?";return r.query(sql, new BeanHandler<User>(User.class),id);
}

最后，将查询的用户信息发送至user_edit.jsp页面进行展示，供管理员修改

<%@ page language="java" contentType="text/html; charset=utf-8"pageEncoding="utf-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE html>
<html>
<head><title>客户修改</title><meta charset="utf-8"/><link rel="stylesheet" href="css/bootstrap.css"/>
</head>
<body>
<div class="container-fluid"><jsp:include page="/admin/header.jsp"></jsp:include><br><br><form class="form-horizontal" action="/admin/user_edit" method="post"><input type="hidden" name="id" value="${u.id }"><div class="form-group"><label for="input_name" class="col-sm-1 control-label">用户名</label><div class="col-sm-5">${u.username }</div></div><div class="form-group"><label for="input_name" class="col-sm-1 control-label">邮箱</label><div class="col-sm-5">${u.email }</div></div><div class="form-group"><label for="input_name" class="col-sm-1 control-label">收货人</label><div class="col-sm-6"><input type="text" class="form-control" id="input_name" name="name" value="${u.name }"></div></div><div class="form-group"><label for="input_name" class="col-sm-1 control-label">电话</label><div class="col-sm-6"><input type="text" class="form-control" id="input_name" name="phone" value="${u.phone }"></div></div><div class="form-group"><label for="input_name" class="col-sm-1 control-label">地址</label><div class="col-sm-6"><input type="text" class="form-control" id="input_name" name="address" value="${u.address }"></div></div><div class="form-group"><div class="col-sm-offset-1 col-sm-10"><button type="submit" class="btn btn-success">提交修改</button></div></div></form><span style="color:red;"></span></div>
</body>
</html>

当管理员修改了客户的收货人，电话或者地址后，点击提交修改按钮，将修改的信息发送给/admin/user_edit服务器地址

在servlet包中创建AdminUserEditServlet类，接收浏览器的请求以及更新的客户信息

package servlet;import model.User;
import org.apache.commons.beanutils.BeanUtils;
import service.UserService;import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;@WebServlet(name = "admin_user_edit",urlPatterns = "/admin/user_edit")
public class AdminUserEditServlet extends HttpServlet {private UserService uService = new UserService();/*** @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)*/protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {User u = new User();try {BeanUtils.copyProperties(u, request.getParameterMap());} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}uService.updateUserAddress(u);request.getRequestDispatcher("/admin/user_list").forward(request, response);}
}

以上代码中，以map集合的格式接收数据参数并封装在user对象中，将user对象发送给业务逻辑层执行

当修改成功后，同步刷新返回客户列表页面

删除客户信息

在客户列表页面中，选择要删除的客户信息的“删除”按钮，向服务器发送/admin/user_delete地址请求，并携带客户编号，在servlet包中创建AdminUserDeleteServlet类，根据客户编号执行删除客户信息操作

package servlet;import service.UserService;import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;@WebServlet(name = "admin_user_delete",urlPatterns = "/admin/user_delete")
public class AdminUserDeleteServlet extends HttpServlet {private UserService uService = new UserService();/*** @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)*/protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {int id = Integer.parseInt(request.getParameter("id"));boolean isSuccess = uService.delete(id);if(isSuccess) {request.setAttribute("msg", "客户删除成功");}else {request.setAttribute("failMsg", "客户有下的订单，请先删除该客户下的订单，再来删除客户！");}request.getRequestDispatcher("/admin/user_list").forward(request, response);}/*** @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)*/protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stubdoGet(request, response);}
}

以上代码中，将接收的客户编号发送给业务逻辑层执行

public boolean delete(int id ) {try {uDao.delete(id);return true;} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();return false;}
}

接着，将客户编号发送给数据访问层操作

public void delete(int id) throws SQLException {QueryRunner r = new QueryRunner(DataSourceUtils.getDataSource());String sql = "delete from user where id = ?";r.update(sql,id);
}

最后，删除成功返回true，否则返回false，servlet根据返回值为true则同步刷新客户列表页面，返回值false则告知管理员删除失败，可能该客户有未完成的订单关联，不能删除该客户信息。