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JavaWeb 课程设计,通过 Jsp+Servlet+MySql 设计实现,性能比较简单,用户能够通过登录注册形式进入治理界面能够治理学生信息,班级信息,课程信息等信息。实现了分页查问,增加信息、批改信息、删除信息、选中删除等性能,上面是运行的界面:
相干技术:
Servlet+JSP+Bootstrap+Jquery+MYSQL
我的项目目录:
后端代码局部:
前端页面局部:
相干 jar 包:
数据库表构造:
`create database StudentInfo;
use StudentInfo;
drop table if exists student;
drop table if exists user;
drop table if exists class;
drop table if exists course;
#用户表
create table user(
id int auto_increment primary key,
username nvarchar(20) null,
password nvarchar(20) null,
name nvarchar(20) null,
gender nchar(10) null,
age int null,
classno nvarchar(20) null,
phone nvarchar(11) unique null,
email nvarchar(30) null
);
#学生表
create table student(
id int auto_increment primary key,
name nvarchar(20) null,
gender nvarchar(10) null,
age int null,
classno nvarchar(20) null,
phone nvarchar(11) unique null,
email nvarchar(30) null
);
#班级表
create table class(
id int auto_increment primary key,
cno nvarchar(10) null,
classname nvarchar(30) null,
department nvarchar(30) null
);
#课程表
create table course(
id int auto_increment primary key,
courseno nvarchar(20) null,
coursename nvarchar(20) null,
type nvarchar(8) null,
period int null,
credit double null
);`
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用户信息表:User
学生信息表:Student
班级信息表:Class
课程信息表:Course
性能展现:
用户登录:
用户注册:
登录胜利:
点击左上角用户名欠缺个人信息:
信息管理局部实现了分页展现,增、删、改、查、批量删除
学生信息管理:
班级信息管理:
课程管理:
设计步骤
代码比拟多,只展现比拟重要的局部:
1. 数据库连贯实现
数据库连贯局部应用的是 druid 数据库连接池,首先先进行数据库连接池的配置:druid.properties
`driverClassName=com.mysql.cj.jdbc.Driver
url=jdbc:mysql://localhost:3306/mydb?serverTimezone=GMT%2B8&useUnicode=true&characterEncoding=utf-8
username=root
password=123456
initialSize=5
maxActive=10
maxWait=3000`
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而后编写数据库连贯工具类:
`/**
* JDBC 工具类 应用 Durid 连接池
*/
public class JDBCUtils {
private static DataSource ds ;
static {
try {
//1. 加载配置文件
Properties pro = new Properties();
// 应用 ClassLoader 加载配置文件,获取字节输出流
InputStream is = JDBCUtils.class.getClassLoader().getResourceAsStream("druid.properties");
pro.load(is);
//2. 初始化连接池对象
ds = DruidDataSourceFactory.createDataSource(pro);
} catch (IOException e) {e.printStackTrace();
} catch (Exception e) {e.printStackTrace();
}
}
/**
* 获取连接池对象
*/
public static DataSource getDataSource(){return ds;}
/**
* 获取连贯 Connection 对象
*/
public static Connection getConnection() throws SQLException {return ds.getConnection();
}
}`
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这里咱们应用 JdbcTemplate 来进行数据连贯操作数据库:
`private JdbcTemplate template = new JdbcTemplate(JDBCUtils.getDataSource());`
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2. 实现长久层(Dao)
编写长久层接口:
`/**
* 用户操作的 DAO
*/
public interface UserDao {
}`
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实现长久层接口:
`public class UserDaoImpl implements UserDao {private JdbcTemplate template = new JdbcTemplate(JDBCUtils.getDataSource());
}`
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3. 实现业务层(Service)
编写业务层接口:
`/**
* 用户治理的业务接口
*/
public interface UserService {
}`
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实现业务层接口:
`public class UserServiceImpl implements UserService {private UserDao dao = new UserDaoImpl();
}`
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4. 实现体现层性能
编写体现层:
`@WebServlet("/loginServlet")
public class LoginServlet extends HttpServlet {protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
/*
* Code
*/
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {this.doPost(request, response);
}
}`
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5. 因为体现层 Servlet 太多,咱们能够做简略的提取
编写 BaseServlet 类,而后由其余 servlet 继承
`public class BaseServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
try {
// 获取申请标识
String methodName = request.getParameter("method");
// 获取指定类的字节码对象
Class<? extends BaseServlet> clazz = this.getClass();// 这里的 this 指的是继承 BaseServlet 对象
// 通过类的字节码对象获取办法的字节码对象
Method method = clazz.getMethod(methodName, HttpServletRequest.class, HttpServletResponse.class);
// 让办法执行
method.invoke(this, request, response);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();}
}
}`
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5. 编写对应的前端页面:以 user_login.jsp 为例
`<%@ 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 的全局款式 -->
<link href="css/bootstrap.min.css" rel="stylesheet">
<!-- 2. jQuery 导入,倡议应用 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. 获取验证码图片对象
var vcode=document.getElementById("vcode");
//2. 设置其 src 属性,加工夫戳
//2. 设置其 src 属性,加工夫戳
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="请输出用户名"/>
</div>
<div class="form-group">
<label for="password"> 明码:</label>
<input type="password" name="password" class="form-control" id="password" placeholder="请输出明码"/>
</div>
<div class="form-inline">
<label for="vcode"> 验证码:</label>
<input type="text" name="verifycode" class="form-control" id="verifycode" placeholder="请输出验证码" 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>`
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运行截图:
测试登录性能,发现中文乱码问题(间接继承 HttpServlet 不会呈现,继承 BaseServlet 会呈现)
6. 编写过滤器解决中文乱码问题
`@WebFilter("/*")
public class CharchaterFilter implements Filter {
protected String encoding;
@Override
public void destroy() {// TODO 主动生成的办法存根}
@Override
public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
// TODO 主动生成的办法存根
HttpServletRequest request=(HttpServletRequest)req;
HttpServletResponse response=(HttpServletResponse)res;
String method=request.getMethod();
if(method.equalsIgnoreCase("post")){request.setCharacterEncoding("utf-8");
}
response.setContentType("text/html;charset=utf-8");
chain.doFilter(request, response);
}
@Override
public void init(FilterConfig arg0) throws ServletException {// TODO 主动生成的办法存根}
}`
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7. 编写列表页面,并在后端代码上实现响应的性能
`<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title> 网站后盾治理 </title>
<!-- Bootstrap -->
<link rel="stylesheet" href="css/bootstrap.min.css">
<!-- jQuery (Bootstrap 的所有 JavaScript 插件都依赖 jQuery,所以必须放在前边) -->
<script type="text/javascript" src="js/jquery-2.1.1.min.js"></script>
<!-- 加载 Bootstrap 的所有 JavaScript 插件。你也能够依据须要只加载单个插件。-->
<script type="text/javascript" src="js/bootstrap.min.js"></script>
<style type="text/css"> @media (min-width: 768px) {
#slider_sub{
width: 200px;
margin-top: 51px;
position: absolute;
z-index: 1;
height: 600px;
}
.mysearch{margin: 10px 0;}
.page_main{margin-left: 205px;}
} </style>
<script> function deleteStudent(id){
// 用户平安提醒
if(confirm("您确定要删除吗?")){
// 拜访门路
location.href="${pageContext.request.contextPath}/student?method=delStudent&id="+id;
}
}
window.onload = function(){
// 给删除选中按钮增加单击事件
document.getElementById("delSelectedStudent").onclick = function(){if(confirm("您确定要删除选中条目吗?")){
var flag = false;
// 判断是否有选中条目
var cbs = document.getElementsByName("id");
for (var i = 0; i < cbs.length; i++) {if(cbs[i].checked){
// 有一个条目选中了
flag = true;
break;
}
}
if(flag){// 有条目被选中
// 表单提交
document.getElementById("form").submit();}
}
}
//1. 获取第一个 cb
document.getElementById("firstCb").onclick = function(){
//2. 获取下边列表中所有的 cb
var cbs = document.getElementsByName("uid");
//3. 遍历
for (var i = 0; i < cbs.length; i++) {//4. 设置这些 cbs[i] 的 checked 状态 = firstCb.checked
cbs[i].checked = this.checked;
}
}
} </script>
</head>
<body>
<nav class="navbar navbar-default navbar-static-top">
<div class="navbar-header">
<!-- 缩放 -->
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#slider_sub">
<span class="sr-only"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a href="#" class="navbar-brand"> 学生信息管理 </a>
</div>
<ul class="nav navbar-nav navbar-right" style="margin-right: 25px">
<li><a href="${pageContext.request.contextPath}/user?method=findUser&id=${user.id}"><span class="badge" style="background: #C12E2A">${user.username}</span></a></li>
<li><a href="${pageContext.request.contextPath}/user?method=destroyUser"><span class="glyphicon glyphicon-off"></span> 登记 </a></li>
</ul>
<!-- 侧边栏 -->
<div class="navbar-default navbar-collapse" id="slider_sub">
<ul class="nav">
<li>
<form class="form-inline" action="${pageContext.request.contextPath}/student?method=findAll" method="post">
<!-- 搜寻 -->
<div class="input-group mysearch">
<input type="text" name="name" value="${condition.name[0]}" class="form-control" id="exampleInputName2" >
<span class="input-group-btn">
<button type="submit" class="btn btn-default">
<span class="glyphicon glyphicon-search"></span>
</button>
</span>
</div>
</form>
</li>
<li><a href="${pageContext.request.contextPath}/index.jsp" class="collapse" data-toggle="collapse"> 首页 <span class="glyphicon glyphicon-chevron-right pull-right"></span></a>
<!-- <ul id="sub2" class="nav collapse">
<li><a href="#"><span class="glyphicon glyphicon-info-sign"></span> 信息管理 </a></li>
<li><a href="#"><span class="glyphicon glyphicon-user"></span> 学生治理 </a></li>
</ul> -->
</li>
<li><a href="${pageContext.request.contextPath}/student?method=findAll" class="collapse" data-toggle="collapse"> 学生治理 <span class="glyphicon glyphicon-chevron-right pull-right"></span></a>
</li>
<li><a href="${pageContext.request.contextPath}/classno?method=findAll" class="collapse" data-toggle="collapse"> 班级治理 <span class="glyphicon glyphicon-chevron-right pull-right"></span></a>
</li>
<li><a href="${pageContext.request.contextPath}/course?method=findAll" class="collapse" data-toggle="collapse"> 课程管理 <span class="glyphicon glyphicon-chevron-right pull-right"></span></a>
</li>
<li><a href="${pageContext.request.contextPath}/about.jsp" class="collapse" data-toggle="collapse"> 对于咱们 <span class="glyphicon glyphicon-chevron-right pull-right"></span></a>
</li>
</ul>
</div>
</nav>
<!-- 主区域 -->
<div class="page_main" style="background: rgba(92,88,116,0.34)">
<ol class="breadcrumb">
<li><a href="#"> 治理首页 </a></li>
<li><a href="#"> 学生治理 </a></li>
<li><a href="#"> 学生信息 </a></li>
</ol>
<div class="row">
<div class="col-md-12 col-sm-3">
<div class="panel panel-default">
<!-- <div class="panel-header"> 学生信息 </div> -->
<div class="panel-body table-responsive">
<div style="float: right;margin: 5px;">
<a class="btn btn-primary" href="${pageContext.request.contextPath}/student_add.jsp"> 增加学生 </a>
<a class="btn btn-primary" href="javascript:void(0);" id="delSelectedStudent"> 删除选中 </a>
</div>
<form id="form" action="${pageContext.request.contextPath}/student?method=delSelectedStudent" method="post">
<table class="table table-striped table-hover" style="margin: 10px;">
<thead>
<tr>
<th><input type="checkbox" id="firstCb"></th>
<th> 编号 </th>
<th> 姓名 </th>
<th> 性别 </th>
<th> 年龄 </th>
<th> 班级 </th>
<th> 电话 </th>
<th> 邮箱 </th>
</tr>
</thead>
<c:forEach items="${pb.list}" var="student" varStatus="s">
<tr>
<td><input type="checkbox" name="id" value="${student.id}"></td>
<td>${student.id}</td>
<td>${student.name}</td>
<td>${student.gender}</td>
<td>${student.age}</td>
<td>${student.classno}</td>
<td>${student.phone}</td>
<td>${student.email}</td>
<td><a class="btn btn-default btn-sm" href="${pageContext.request.contextPath}/student?method=findStudent&id=${student.id}"> 批改 </a>
<a class="btn btn-default btn-sm" href="javascript:deleteStudent(${student.id});"> 删除 </a></td>
</tr>
</c:forEach>
</table>
</form>
<nav aria-label="Page navigation" class="pull-right">
<ul class="pagination" style="margin-top: 10px;">
<c:if test="${pb.currentPage == 1}">
<li class="disabled">
</c:if>
<c:if test="${pb.currentPage != 1}">
<li>
</c:if>
<a href="${pageContext.request.contextPath}/student?method=findAll¤tPage=${pb.currentPage - 1}&rows=5&name=${condition.name[0]}&address=${condition.address[0]}&email=${condition.email[0]}" aria-label="Previous">
<span aria-hidden="true">«</span>
</a>
</li>
<c:forEach begin="1" end="${pb.totalPage}" var="i" >
<c:if test="${pb.currentPage == i}">
<li class="active"><a href="${pageContext.request.contextPath}/student?method=findAll¤tPage=${i}&rows=5&name=${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="${pageContext.request.contextPath}/student?method=findAll¤tPage=${i}&rows=5&name=${condition.name[0]}&address=${condition.address[0]}&email=${condition.email[0]}">${i}</a></li>
</c:if>
</c:forEach>
<li>
<a href="${pageContext.request.contextPath}/student?method=findAll¤tPage=${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>
<span style="font-size: 25px;margin-left: 5px;">
共 ${pb.totalCount} 条记录,共 ${pb.totalPage} 页
</span>
</ul>
</nav>
</div>
</div>
</div>
</div>
</div>
</body>
</html>`
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8. 实现不同信息的删除批改性能,并进一步欠缺
`<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!-- 网页应用的语言 -->
<html lang="zh-CN">
<head>
<!-- 指定字符集 -->
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title> 批改学生信息 </title>
<link href="css/bootstrap.min.css" rel="stylesheet">
<script src="js/jquery-2.1.0.min.js"></script>
<script src="js/bootstrap.min.js"></script>
</head>
<body>
<div class="container" style="width: 400px;">
<h3 style="text-align: center;"> 批改学生信息 </h3>
<form action="${pageContext.request.contextPath}/student?method=updateStudent" method="post">
<!-- 暗藏域 提交 id-->
<input type="hidden" name="id" value="${student.id}">
<div class="form-group">
<label for="name"> 姓名:</label>
<input type="text" class="form-control" id="name" name="name" value="${student.name}" readonly="readonly" placeholder="请输出姓名" />
</div>
<div class="form-group">
<label> 性别:</label>
<c:if test="${student.gender ==' 男 '}">
<input type="radio" name="gender" value="男" checked /> 男
<input type="radio" name="gender" value="女" /> 女
</c:if>
<c:if test="${student.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" value="${student.age}" id="age" name="age" placeholder="请输出年龄" />
</div>
<div class="form-group">
<label for="classno"> 班级:</label>
<input type="text" id="classno" class="form-control" value="${student.classno}" name="classno" placeholder="请输出班级信息"/>
</div>
<div class="form-group">
<label for="phone"> 电话 </label>
<input type="text" id="phone" class="form-control" value="${student.phone}" name="phone" placeholder="请输出电话号码"/>
</div>
<div class="form-group">
<label for="email">Email:</label>
<input type="text" id="email" class="form-control" value="${student.email}" name="email" placeholder="请输出邮箱地址"/>
</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" />
</div>
</form>
</div>
</body>
</html>`
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