关于java:JavaWeb课程设计学生信息管理系统JspServletMySql

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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>&times;</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>&nbsp; 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="${pageContext.request.contextPath}/index.jsp" class="collapse" data-toggle="collapse"> 首页 <span class="glyphicon glyphicon-chevron-right pull-right"></span></a>
                     <!-- <ul id="sub2" class="nav collapse">
                        <li><a href="#"><span class="glyphicon glyphicon-info-sign"></span>&nbsp; 信息管理 </a></li>
                        <li><a href="#"><span class="glyphicon glyphicon-user"></span>&nbsp; 学生治理 </a></li>
                    </ul> -->
                </li>
                <li><a href="${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=${student.id}"> 批改 </a>&nbsp;
                                        <a class="btn btn-default btn-sm" href="javascript:deleteStudent(${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="${pageContext.request.contextPath}/student?method=findAll&currentPage=${pb.currentPage - 1}&rows=5&name=${condition.name[0]}&address=${condition.address[0]}&email=${condition.email[0]}" aria-label="Previous">
                                        <span aria-hidden="true">&laquo;</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&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="${pageContext.request.contextPath}/student?method=findAll&currentPage=${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="${pageContext.request.contextPath}/student?method=findAll&currentPage=${pb.currentPage + 1}&rows=5&name=${condition.name[0]}&address=${condition.address[0]}&email=${condition.email[0]}" aria-label="Next">
                                        <span aria-hidden="true">&raquo;</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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