目录
2.2.2 用户信息列表样式（FindUserByPageServlet & list.jsp）
2.2.3 添加功能（AddUserServlet & add.jsp）
2.3 删除功能（DeleteUserServlet & delete.jsp）
2.3.3 删除功能代码（DeleteUserServlet & delete.jsp）
2.4.3 修改功能代码（update.jsp & UpdateUserServlet）
一、总结
该系统结合以前所学+现在所学=用户管理系统；
该系统功能实现为javaSE+javaWb=用户信息管理系统；
该系统运用功能（包括但不限于）：Servlet+JSP+MySQL+JDBCTemplate+Druid+BeanUtils+tomcat......
该系统功能分类：登录信息验证码验证，简单增删改查，复杂分页查询，复查条件查询；
页面展示：
用户信息管理系统.avi
二、功能实现
2.1 登录功能
2.1.1 登录界面样式
?该界面功能：用户名&密码验证，验证码验证，错误信息提示
2.1.2 具体代码
展示界面：（login.jsp）
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="utf-8"/>
<meta http-equiv="X-UA-Compatible" content="IE=edge"/>
<meta name="viewport" content="width=device-width, initial-scale=1"/>
<title>管理员登录</title>
<!-- 1. 导入CSS的全局样式 -->
<link href="css/bootstrap.min.css" rel="stylesheet">
<!-- 2. jQuery导入，建议使用1.9以上的版本 -->
<script src="js/jquery-2.1.0.min.js"></script>
<!-- 3. 导入bootstrap的js文件 -->
<script src="js/bootstrap.min.js"></script>
<script type="text/javascript">
//切换验证码
function refreshCode() {
//1.获取验证码的图片对象
var vcode = document.getElementById("vcode");
//2.设置其src属性，加时间戳
vcode.src="${pageContext.request.contextPath}/checkCodeServlet?time="+new Date().getTime();
}
</script>
</head>
<body>
<div class="container" style="width: 400px;">
<h3 style="text-align: center;">管理员登录</h3>
<form action="${pageContext.request.contextPath}/loginServlet" method="post">
<div class="form-group">
<label for="user">用户名：</label>
<input type="text" name="username" class="form-control" id="user" placeholder="请输入用户名"/>
</div>
<div class="form-group">
<label for="password">密码：</label>
<input type="password" name="password" class="form-control" id="password" placeholder="请输入密码"/>
</div>
<div class="form-inline">
<label for="vcode">验证码：</label>
<input type="text" name="verifycode" class="form-control" id="verifycode" placeholder="请输入验证码" style="width: 120px;"/>
<a href="javascript:refreshCode()"><img src="${pageContext.request.contextPath}/checkCodeServlet" title="看不清点击刷新" id="vcode"/></a>
</div>
<hr/>
<div class="form-group" style="text-align: center;">
<input class="btn btn btn-primary" type="submit" value="登录">
</div>
</form>
<!-- 出错显示的信息框 -->
<div class="alert alert-warning alert-dismissible" role="alert">
<button type="button" class="close" data-dismiss="alert" >
<span>×</span>
</button>
<strong>${login_msg}</strong>
</div>
</div>
</body>
</html>后台实现界面：(LoginServlet)
package cn.itcast.web.servlet;
import cn.itcast.domain.User;
import cn.itcast.service.UserService;
import cn.itcast.service.impl.UserServiceImpl;
import org.apache.commons.beanutils.BeanUtils;
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 javax.servlet.http.HttpSession;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.util.Map;
@WebServlet("/loginServlet")
public class LoginServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//1.设置编码
request.setCharacterEncoding("utf-8");
//2.获取数据
//2.1获取用户填写验证码
String verifycode = request.getParameter("verifycode");
Map<String, String[]> map = request.getParameterMap();
//3.验证码校验
HttpSession session = request.getSession();
String checkcode_server = (String) session.getAttribute("CHECKCODE_SERVER");
//确保代码的一次性
session.removeAttribute("CHECKCODE_SERVER");
if (!checkcode_server.equalsIgnoreCase(verifycode)){
//验证码不正确
//提示信息
request.setAttribute("login_msg", "验证码错误！");
//跳转登录界面
request.getRequestDispatcher("/login.jsp").forward(request, response);
return;
}
//4.封装User对象
User user=new User();
try {
BeanUtils.populate(user, map);
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
//5.调用Service查询
UserService service=new UserServiceImpl();
User loginUser = service.login(user);
//6.判断是否登录成功
if (loginUser != null){
//登录成功
//将用户存入session
session.setAttribute("user", loginUser);
//跳转页面
response.sendRedirect(request.getContextPath()+"/index.jsp");
}else {
//登录失败
//提示信息
request.setAttribute("login_msg","用户名或密码错误！");
//跳转登录页面
request.getRequestDispatcher("/login.jsp").forward(request, response);
}
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doPost(request, response);
}
}?验证码实现界面：CheckCodeServlet
package cn.itcast.web.servlet;
import javax.imageio.ImageIO;
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.awt.*;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;
/**
* 验证码
*/
@WebServlet("/checkCodeServlet")
public class CheckCodeServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {
//服务器通知浏览器不要缓存
response.setHeader("pragma","no-cache");
response.setHeader("cache-control","no-cache");
response.setHeader("expires","0");
//在内存中创建一个长80，宽30的图片，默认黑色背景
//参数一：长
//参数二：宽
//参数三：颜色
int width = 80;
int height = 30;
BufferedImage image = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);
//获取画笔
Graphics g = image.getGraphics();
//设置画笔颜色为灰色
g.setColor(Color.GRAY);
//填充图片
g.fillRect(0,0, width,height);
//产生4个随机验证码，12Ey
String checkCode = getCheckCode();
//将验证码放入HttpSession中
request.getSession().setAttribute("CHECKCODE_SERVER",checkCode);
//设置画笔颜色为黄色
g.setColor(Color.YELLOW);
//设置字体的小大
g.setFont(new Font("黑体",Font.BOLD,24));
//向图片上写入验证码
g.drawString(checkCode,15,25);
//将内存中的图片输出到浏览器
//参数一：图片对象
//参数二：图片的格式，如PNG,JPG,GIF
//参数三：图片输出到哪里去
ImageIO.write(image,"PNG",response.getOutputStream());
}
/**
* 产生4位随机字符串
*/
private String getCheckCode() {
String base = "0123456789ABCDEFGabcdefg";
int size = base.length();
Random r = new Random();
StringBuffer sb = new StringBuffer();
for(int i=1;i<=4;i++){
//产生0到size-1的随机值
int index = r.nextInt(size);
//在base字符串中获取下标为index的字符
char c = base.charAt(index);
//将c放入到StringBuffer中去
sb.append(c);
}
return sb.toString();
}
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doGet(request,response);
}
}
?当用户名&密码&验证码都正确的时候（存在BUG，管理员与用户的区别，现在只能登录管理员），就会跳转到index.jsp跳转页面，就可以查询所有用户信息。
index.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="utf-8"/>
<meta http-equiv="X-UA-Compatible" content="IE=edge"/>
<meta name="viewport" content="width=device-width, initial-scale=1"/>
<title>首页</title>
<!-- 1. 导入CSS的全局样式 -->
<link href="css/bootstrap.min.css" rel="stylesheet">
<!-- 2. jQuery导入，建议使用1.9以上的版本 -->
<script src="js/jquery-2.1.0.min.js"></script>
<!-- 3. 导入bootstrap的js文件 -->
<script src="js/bootstrap.min.js"></script>
<script type="text/javascript">
</script>
</head>
<body>
<div>${user.name},欢迎您！</div>
<div align="center">
<a
href="${pageContext.request.contextPath}/findUserByPageServlet" style="text-decoration:none;font-size:33px">查询所有用户信息
</a>
</div>
</body>
</html>
2.2 添加功能
2.2.1 添加功能逻辑图
2.2.2 用户信息列表样式（FindUserByPageServlet & list.jsp）
findUserByPageServlet代码：
package cn.itcast.web.servlet;
import cn.itcast.domain.PageBean;
import cn.itcast.domain.User;
import cn.itcast.service.UserService;
import cn.itcast.service.impl.UserServiceImpl;
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.util.Map;
@WebServlet("/findUserByPageServlet")
public class FindUserByPageServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
//1.获取参数
String currentPage = request.getParameter("currentPage");//当前页码
String rows = request.getParameter("rows");//每页显示条数
if (currentPage == null || "".equals(currentPage)) {
currentPage = "1";
}
if (rows == null || "".equals(rows)) {
rows = "5";
}
//获取条件查询参数
Map<String, String[]> condition = request.getParameterMap();
//2.调用service查询
UserService service = new UserServiceImpl();
PageBean<User> pb = service.findUserByPage(currentPage, rows,condition);
//3.将PageBean存入request
request.setAttribute("pb", pb);
request.setAttribute("condition", condition);//将查询条件存入request
//4.转发到list.jsp
request.getRequestDispatcher("/list.jsp").forward(request, response);
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doPost(request, response);
}
}?list.jsp(※特别重要※)（信息展示的所有样式代码，增删改查所有功能按钮都在此页面）
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<!-- 网页使用的语言 -->
<html lang="zh-CN">
<head>
<!-- 指定字符集 -->
<meta charset="utf-8">
<!-- 使用Edge最新的浏览器的渲染方式 -->
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<!-- viewport视口：网页可以根据设置的宽度自动进行适配，在浏览器的内部虚拟一个容器，容器的宽度与设备的宽度相同。
width: 默认宽度与设备的宽度相同
initial-scale: 初始的缩放比，为1:1 -->
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- 上述3个meta标签*必须*放在最前面，任何其他内容都*必须*跟随其后！ -->
<title>用户信息管理系统</title>
<!-- 1. 导入CSS的全局样式 -->
<link href="css/bootstrap.min.css" rel="stylesheet">
<!-- 2. jQuery导入，建议使用1.9以上的版本 -->
<script src="js/jquery-2.1.0.min.js"></script>
<!-- 3. 导入bootstrap的js文件 -->
<script src="js/bootstrap.min.js"></script>
<style type="text/css">
td, th {
text-align: center;
}
</style>
<script>
function deleteUser(id) {
//用户安全提示
if (confirm("您确定要删除吗？")){
//访问路径
location.href="${pageContext.request.contextPath}/delUserServlet?id="+id;
}
}
window.onload=function () {
//删除选中
//给删除选中按钮添加单击事件
document.getElementById("delSelected").onclick=function () {
//给出提示信息
if (confirm("您确定要删除选中条目吗？")){
var flag=false;
//判断是否有选中条目
var cbs=document.getElementsByName("uid");
for (var i = 0; i < cbs.length; i++) {
if (cbs[i].checked){
//至少有一个条目被选中
flag=true;
break;
}
}
if (flag){//有条目被选中
//表单提交
document.getElementById("form").submit();
}
}
}
//删除所有选中
//1.获取第一个cb
document.getElementById("firstCb").onclick=function () {
//2.获取下行列表中所有的cb
var cbs=document.getElementsByName("uid");
//3.遍历
for (var i = 0; i < cbs.length; i++) {
//4.设置这些cbs[i]的checked状态 = firstCb.checked
cbs[i].checked=this.checked;
}
}
}
</script>
</head>
<body>
<div class="container">
<h3 style="text-align: center">用户信息列表</h3>
<div style="float: left">
<form class="form-inline" action="${pageContext.request.contextPath}/findUserByPageServlet" method="post">
<div class="form-group">
<label for="exampleInputName2">姓名</label>
<input type="text" value="${condition.name[0]}" name="name" class="form-control" id="exampleInputName2">
</div>
<div class="form-group">
<label for="exampleInputName3">籍贯</label>
<input type="text" value="${condition.address[0]}" name="address" class="form-control" id="exampleInputName3">
</div>
<div class="form-group">
<label for="exampleInputEmail2">邮箱</label>
<input type="text" value="${condition.email[0]}" name="email" class="form-control" id="exampleInputEmail2">
</div>
<button type="submit" class="btn btn-default">查询</button>
</form>
</div>
<div style="float: right;margin:5px">
<a class="btn btn-primary" href="${pageContext.request.contextPath}/add.jsp">添加联系人</a>
<a class="btn btn-primary" href="javascript:void(0);" id="delSelected">删除选中</a>
</div>
<form id="form" action="${pageContext.request.contextPath}/delSelectedServlet" method="post">
<table border="1" class="table table-bordered table-hover">
<tr class="success">
<th><input type="checkbox" id="firstCb"></th>
<th>编号</th>
<th>姓名</th>
<th>性别</th>
<th>年龄</th>
<th>籍贯</th>
<th>QQ</th>
<th>邮箱</th>
<th>操作</th>
</tr>
<c:forEach items="${pb.list}" var="user" varStatus="s">
<tr>
<td><input type="checkbox" name="uid" value="${user.id}"></td>
<td>${s.count}</td>
<td>${user.name}</td>
<td>${user.gender}</td>
<td>${user.age}</td>
<td>${user.address}</td>
<td>${user.QQ}</td>
<td>${user.email}</td>
<td><a class="btn btn-default btn-sm" href="${pageContext.request.contextPath}/findUserServlet?id=${user.id}">修改</a>
<a class="btn btn-default btn-sm" href="javascript:deleteUser(${user.id});">删除</a></td>
</tr>
</c:forEach>
</table>
</form>
<div>
<nav aria-label="Page navigation">
<ul class="pagination">
<c:if test="${pb.currentPage == 1}">
<li class="disabled">
<span aria-hidden="true">«</span>
</li>
</c:if>
<c:if test="${pb.currentPage != 1}">
<li>
<a href="${pageContext.request.contextPath}/findUserByPageServlet?currentPage=${pb.currentPage-1}&rows=5&name=${condition.name[0]}&address=${condition.address[0]}&email=${condition.email[0]}" aria-label="Previous">
<span aria-hidden="true">«</span>
</a>
</li>
</c:if>
<c:forEach begin="1" end="${pb.totalPage}" var="i">
<c:if test="${pb.currentPage==i}">
<li class="active"><a href="${pageContext.request.contextPath}/findUserByPageServlet?currentPage=${i}&rows=5&name=${condition.name[0]}&address=${condition.address[0]}&email=${condition.email[0]}">${i}</a></li>
</c:if>
<c:if test="${pb.currentPage!=i}">
<li><a href="${pageContext.request.contextPath}/findUserByPageServlet?currentPage=${i}&rows=5&name=${condition.name[0]}&address=${condition.address[0]}&email=${condition.email[0]}">${i}</a></li>
</c:if>
</c:forEach>
<c:if test="${pb.currentPage == pb.totalPage}">
<li class="disabled">
<span aria-hidden="true">»</span>
</li>
</c:if>
<c:if test="${pb.currentPage != pb.totalPage}">
<li>
<a href="${pageContext.request.contextPath}/findUserByPageServlet?currentPage=${pb.currentPage+1}&rows=5&name=${condition.name[0]}&address=${condition.address[0]}&email=${condition.email[0]}" aria-label="Next">
<span aria-hidden="true">»</span>
</a>
</li>
</c:if>
<span style="font-size: 25px;margin-left:5px ">
共${pb.totalCount}条记录，共${pb.totalPage}页
</span>
</ul>
</nav>
</div>
</div>
</body>
</html>2.2.3 添加功能（AddUserServlet & add.jsp）
样式展示
AddUserServlet代码
package cn.itcast.web.servlet;
import cn.itcast.domain.User;
import cn.itcast.service.UserService;
import cn.itcast.service.impl.UserServiceImpl;
import org.apache.commons.beanutils.BeanUtils;
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;
import java.util.Map;
@WebServlet("/addUserServlet")
public class AddUserServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//1.设置编码
request.setCharacterEncoding("utf-8");
//2.获取参数
Map<String, String[]> map = request.getParameterMap();
//3.封装对象
User user=new User();
try {
BeanUtils.populate(user, map);
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
//4.调用Service保存
UserService service=new UserServiceImpl();
service.addUser(user);
//5.跳转到userListServlet
response.sendRedirect(request.getContextPath()+"/findUserByPageServlet");
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doPost(request, response);
}
}add.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<!-- 网页使用的语言 -->
<html lang="zh-CN">
<head>
<!-- 指定字符集 -->
<meta charset="utf-8">
<!-- 使用Edge最新的浏览器的渲染方式 -->
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<!-- viewport视口：网页可以根据设置的宽度自动进行适配，在浏览器的内部虚拟一个容器，容器的宽度与设备的宽度相同。
width: 默认宽度与设备的宽度相同
initial-scale: 初始的缩放比，为1:1 -->
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- 上述3个meta标签*必须*放在最前面，任何其他内容都*必须*跟随其后！ -->
<title>添加用户</title>
<!-- 1. 导入CSS的全局样式 -->
<link href="css/bootstrap.min.css" rel="stylesheet">
<!-- 2. jQuery导入，建议使用1.9以上的版本 -->
<script src="js/jquery-2.1.0.min.js"></script>
<!-- 3. 导入bootstrap的js文件 -->
<script src="js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<center><h3>添加联系人页面</h3></center>
<form action="${pageContext.request.contextPath}/addUserServlet" method="post">
<div class="form-group">
<label for="name">姓名：</label>
<input type="text" class="form-control" id="name" name="name" placeholder="请输入姓名">
</div>
<div class="form-group">
<label>性别：</label>
<input type="radio" name="gender" value="男" checked="checked"/>男
<input type="radio" name="gender" value="女"/>女
</div>
<div class="form-group">
<label for="age">年龄：</label>
<input type="text" class="form-control" id="age" name="age" placeholder="请输入年龄">
</div>
<div class="form-group">
<label for="address">籍贯：</label>
<select name="address" class="form-control" id="address">
<option value="广东">广东</option>
<option value="广西">广西</option>
<option value="湖南">湖南</option>
</select>
</div>
<div class="form-group">
<label for="QQ">QQ：</label>
<input type="text" class="form-control" name="QQ" id="QQ" placeholder="请输入QQ号码"/>
</div>
<div class="form-group">
<label for="email">Email：</label>
<input type="text" class="form-control" name="email" id="email" placeholder="请输入邮箱地址"/>
</div>
<div class="form-group" style="text-align: center">
<input class="btn btn-primary" type="submit" value="提交" />
<input class="btn btn-default" type="reset" value="重置" />
<input class="btn btn-default" type="button" value="返回" />
</div>
</form>
</div>
</body>
</html>2.3 删除功能（DeleteUserServlet & delete.jsp）
2.3.1 删除功能逻辑图
简单删除功能
?删除选中功能（多选）
2.3.2 删除提示框
删除选中一个的时候，在修改旁的删除按钮提示框
多选时，删除选中按钮提示框
2.3.3 删除功能代码（DeleteUserServlet & delete.jsp）
删除数据库中的数据
删除功能的具体实现地址：list.jsp/javaScript
<script>
function deleteUser(id) {
//用户安全提示
if (confirm("您确定要删除吗？")){
//访问路径
location.href="${pageContext.request.contextPath}/delUserServlet?id="+id;
}
}
window.onload=function () {
//删除选中
//给删除选中按钮添加单击事件
document.getElementById("delSelected").onclick=function () {
//给出提示信息
if (confirm("您确定要删除选中条目吗？")){
var flag=false;
//判断是否有选中条目
var cbs=document.getElementsByName("uid");
for (var i = 0; i < cbs.length; i++) {
if (cbs[i].checked){
//至少有一个条目被选中
flag=true;
break;
}
}
if (flag){//有条目被选中
//表单提交
document.getElementById("form").submit();
}
}
}
//删除所有选中
//1.获取第一个cb
document.getElementById("firstCb").onclick=function () {
//2.获取下行列表中所有的cb
var cbs=document.getElementsByName("uid");
//3.遍历
for (var i = 0; i < cbs.length; i++) {
//4.设置这些cbs[i]的checked状态 = firstCb.checked
cbs[i].checked=this.checked;
}
}
}
</script>DeleteUserServlet
package cn.itcast.web.servlet;
import cn.itcast.service.UserService;
import cn.itcast.service.impl.UserServiceImpl;
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("/delSelectedServlet")
public class DelSelectedServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//1.获取所有id
String[] ids = request.getParameterValues("uid");
//2.调用service删除
UserService service=new UserServiceImpl();
service.delSelectedUser(ids);
//3.跳转查询所有Servlet
response.sendRedirect(request.getContextPath()+"/findUserByPageServlet");
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doPost(request, response);
}
}delSelectedUser(封装、继承、多态)
@Override
public void deleteUser(String id) {
dao.delete(Integer.parseInt(id));
}dao.delete();
@Override
public void delete(int id) {
//1.定义sql
String sql = "delete from user where id = ?";
//2.执行sql
template.update(sql, id);
}2.4 修改功能
2.4.1 修改功能逻辑图
2.4.2 修改样式
2.4.3 修改功能代码（update.jsp & UpdateUserServlet）
update.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<!-- 网页使用的语言 -->
<html lang="zh-CN">
<head>
<!-- 指定字符集 -->
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>修改用户</title>
<link href="css/bootstrap.min.css" rel="stylesheet">
<script src="js/jquery-2.1.0.min.js"></script>
<script src="js/bootstrap.min.js"></script>
</head>
<body>
<div class="container" style="width: 400px;">
<h3 style="text-align: center;">修改联系人</h3>
<form action="${pageContext.request.contextPath}/updateUserServlet" method="post">
<%--隐藏域，提交id--%>
<input type="hidden" name="id" value="${user.id}">
<div class="form-group">
<label for="name">姓名：</label>
<input type="text" class="form-control" id="name" name="name" value="${user.name}" readonly="readonly" placeholder="请输入姓名" />
</div>
<div class="form-group">
<label>性别：</label>
<c:if test="${user.gender == '男'}">
<input type="radio" name="gender" value="男" checked />男
<input type="radio" name="gender" value="女" />女
</c:if>
<c:if test="${user.gender == '女'}">
<input type="radio" name="gender" value="男" />男
<input type="radio" name="gender" value="女" checked />女
</c:if>
</div>
<div class="form-group">
<label for="age">年龄：</label>
<input type="text" class="form-control" id="age" value="${user.age}" name="age" placeholder="请输入年龄" />
</div>
<div class="form-group">
<label for="address">籍贯：</label>
<select name="address" id="address" class="form-control" >
<c:if test="${user.address == '广东'}">
<option value="广东" selected>广东</option>
<option value="广西">广西</option>
<option value="湖南">湖南</option>
<option value="陕西" >陕西</option>
<option value="北京" >北京</option>
</c:if>
<c:if test="${user.address == '广西'}">
<option value="广东">广东</option>
<option value="广西" selected>广西</option>
<option value="湖南">湖南</option>
<option value="陕西" >陕西</option>
<option value="北京" >北京</option>
</c:if>
<c:if test="${user.address == '湖南'}">
<option value="广东">广东</option>
<option value="广西">广西</option>
<option value="湖南" selected>湖南</option>
<option value="北京" >北京</option>
<option value="陕西" >陕西</option>
</c:if>
<c:if test="${user.address == '陕西'}">
<option value="广东">广东</option>
<option value="广西">广西</option>
<option value="湖南" >湖南</option>
<option value="陕西" selected>陕西</option>
<option value="北京" >北京</option>
</c:if>
<c:if test="${user.address == '北京'}">
<option value="广东">广东</option>
<option value="广西">广西</option>
<option value="湖南" >湖南</option>
<option value="陕西" >陕西</option>
<option value="北京" selected>北京</option>
</c:if>
</select>
</div>
<div class="form-group">
<label for="QQ">QQ：</label>
<input type="text" class="form-control" name="QQ" id="QQ" value="${user.QQ}" placeholder="请输入QQ号码"/>
</div>
<div class="form-group">
<label for="email">Email：</label>
<input type="text" class="form-control" name="email" id="email" value="${user.email}" placeholder="请输入邮箱地址"/>
</div>
<div class="form-group" style="text-align: center">
<input class="btn btn-primary" type="submit" value="提交" />
<input class="btn btn-default" type="reset" value="重置" />
<input class="btn btn-default" type="button" value="返回"/>
</div>
</form>
</div>
</body>
</html>UpdateUserServlet
package cn.itcast.web.servlet;
import cn.itcast.domain.User;
import cn.itcast.service.UserService;
import cn.itcast.service.impl.UserServiceImpl;
import org.apache.commons.beanutils.BeanUtils;
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;
import java.util.Map;
@WebServlet("/updateUserServlet")
public class UpdateUserServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//1.设置编码
request.setCharacterEncoding("utf-8");
//2.获取map
Map<String, String[]> map = request.getParameterMap();
//3.封装对象
User user=new User();
try {
BeanUtils.populate(user, map);
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
//4.调用Service修改
UserService service=new UserServiceImpl();
service.updateUser(user);
//5.跳转到查询所有Servlet
response.sendRedirect(request.getContextPath()+"/findUserByPageServlet");
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doPost(request, response);
}
}2.5 查询功能
2.5.1 查询功能逻辑图
分页功能查询
复杂条件分页查询
2.5.2 查询功能样式
查询框样式
?查询要求位置
分页查询位置（特别要求，上一页下一页按钮在第一页和最后一页时不能再点击）
2.5.3 查询功能代码
查询用户：FindUserServlet
package cn.itcast.web.servlet;
import cn.itcast.domain.User;
import cn.itcast.service.UserService;
import cn.itcast.service.impl.UserServiceImpl;
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("/findUserServlet")
public class FindUserServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//1.获取id
String id = request.getParameter("id");
//2.调用Service查询
UserService service=new UserServiceImpl();
User user=service.findUserById(id);
//3.将user存入request中
request.setAttribute("user", user);
//4.转发到update.jsp
request.getRequestDispatcher("/update.jsp").forward(request, response);
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doPost(request, response);
}
}
分页查询功能代码：FindUserByPageServlet
package cn.itcast.web.servlet;
import cn.itcast.domain.PageBean;
import cn.itcast.domain.User;
import cn.itcast.service.UserService;
import cn.itcast.service.impl.UserServiceImpl;
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.util.Map;
@WebServlet("/findUserByPageServlet")
public class FindUserByPageServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
//1.获取参数
String currentPage = request.getParameter("currentPage");//当前页码
String rows = request.getParameter("rows");//每页显示条数
if (currentPage == null || "".equals(currentPage)) {
currentPage = "1";
}
if (rows == null || "".equals(rows)) {
rows = "5";
}
//获取条件查询参数
Map<String, String[]> condition = request.getParameterMap();
//2.调用service查询
UserService service = new UserServiceImpl();
PageBean<User> pb = service.findUserByPage(currentPage, rows,condition);
//3.将PageBean存入request
request.setAttribute("pb", pb);
request.setAttribute("condition", condition);//将查询条件存入request
//4.转发到list.jsp
request.getRequestDispatcher("/list.jsp").forward(request, response);
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doPost(request, response);
}
}
三、一些包、一些特殊类、一些功能的实现
看图说话：
?
?代码太多，所以我上传了。
链接：https://pan.baidu.com/s/1Pn1mcnnmmZvvYTtBuS_itQ?
提取码：ck3h