课堂测试用javaweb写一个注册界面，并将数据保存到后台数据库（部分完成）

今天我到现在为止，也只完成了数据库的连接，还没有写前台的javascript的检查输入的代码，打算周四前完成。

代码如下：

 package Dao;

 import java.sql.Connection;
 import java.sql.Statement;

 import DBUtil.DBUtil;

 import Entity.User;

 public class Dao {

     public boolean add(User user) {
         String sql = "insert into uses1 (username,password,sex,name,stuname,email,xueyuan,xi,banji,year,address,addtext) values('"+ user.getUsername() + "','"+ user.getPassword() +"','"+ user.getSex() +"','"+user.getName() +"','"+ user.getStuname() +"','"+user.getEmail()+"','"+ user.getXueyuan() +"','"+user.getXi()+"','"+user.getBanji()+"','"+user.getYear()+"','"+user.getAddress()+"','"+user.getAddtext()+"')";
         Connection conn = DBUtil.getConn();
         Statement state = null;
         boolean f = false;
         int a = 0;

         try {
             state = conn.createStatement();
             a=state.executeUpdate(sql);
         } catch (Exception e) {
             e.printStackTrace();
         } finally {

             DBUtil.close(state, conn);
         }

         if (a > 0) {
             f = true;
         }
         return f;

 }

 }

 package DBUtil;

 import java.sql.Connection;
 import java.sql.DriverManager;
 import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.sql.Statement;

 /**
  * @author Hu
  *
  */
 public class DBUtil {

     public static String db_url = "jdbc:mysql://localhost:3306/user?serverTimezone=UTC";
     public static String db_user = "root";
     public static String db_pass = "123";

     public static Connection getConn () {
         Connection conn = null;

         try {
             Class.forName("com.mysql.cj.jdbc.Driver");
             conn = DriverManager.getConnection(db_url, db_user, db_pass);
         } catch (Exception e) {
             e.printStackTrace();
         }

         return conn;
     }

     public static void close (Statement state, Connection conn) {
         if (state != null) {
             try {
                 state.close();
             } catch (SQLException e) {
                 e.printStackTrace();
             }
         }

         if (conn != null) {
             try {
                 conn.close();
             } catch (SQLException e) {
                 e.printStackTrace();
             }
         }
     }

     public static void close (ResultSet rs, Statement state, Connection conn) {
         if (rs != null) {
             try {
                 rs.close();
             } catch (SQLException e) {
                 e.printStackTrace();
             }
         }

         if (state != null) {
             try {
                 state.close();
             } catch (SQLException e) {
                 e.printStackTrace();
             }
         }

         if (conn != null) {
             try {
                 conn.close();
             } catch (SQLException e) {
                 e.printStackTrace();
             }
         }
     }

     public static void main(String[] args) throws SQLException {
         Connection conn = getConn();
         PreparedStatement pstmt = null;
         ResultSet rs = null;
         String sql ="select * from users";
         pstmt = conn.prepareStatement(sql);
         rs = pstmt.executeQuery();
         if(rs.next()){
             System.out.println("空");
         }else{
             System.out.println("不空");
         }
     }
 }

 package Entity;

 public class User {

     private String username;
     private String password;
     private String sex;
     private String name;
     private String stuname;
     private String email;
     private String xueyuan;
     private String xi;
     private String banji;
     private String year;
     private String address;
     private String addtext;

     public String getUsername() {
         return username;
     }

     public void setUsername(String username) {
         this.username = username;
     }

     public String getPassword() {
         return password;
     }

     public void setPassword(String password) {
         this.password = password;
     }

     public String getSex() {
         return sex;
     }

     public void setSex(String sex) {
         this.sex = sex;
     }

     public String getName() {
         return name;
     }

     public void setName(String name) {
         this.name = name;
     }

     public String getStuname() {
         return stuname;
     }

     public void setStuname(String stuname) {
         this.stuname = stuname;
     }

     public String getEmail() {
         return email;
     }

     public void setEmail(String email) {
         this.email = email;
     }

     public String getXueyuan() {
         return xueyuan;
     }

     public void setXueyuan(String xueyuan) {
         this.xueyuan = xueyuan;
     }

     public String getXi() {
         return xi;
     }

     public void setXi(String xi) {
         this.xi = xi;
     }

     public String getBanji() {
         return banji;
     }

     public void setBanji(String banji) {
         this.banji = banji;
     }

     public String getYear() {
         return year;
     }

     public void setYear(String year) {
         this.year = year;
     }

     public String getAddress() {
         return address;
     }

     public void setAddress(String address) {
         this.address = address;
     }

     public String getAddtext() {
         return addtext;
     }

     public void setAddtext(String addtext) {
         this.addtext = addtext;
     }

     public User() {}

 public User(String username,String password,String sex,String name,String stuname,String email,String xueyuan, String xi,String banji,String year,String address,String addtext) {

         this.username=username;
         this.password=password;
         this.sex=sex;
         this.name=name;
         this.stuname=stuname;
         this.email=email;
         this.xueyuan=xueyuan;
         this.xi=xi;
         this.banji=banji;
         this.year=year;
         this.address=address;
         this.addtext=addtext;

     }

 }

 package Servlet;

 import java.io.IOException;

 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 Dao.Dao;

 import Entity.User;

 @WebServlet("/Servlet")
 public class Servlet extends HttpServlet {
     private static final long serialVersionUID = 1L;

     public Servlet() {
         super();

     }
     protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
         req.setCharacterEncoding("utf-8");
         String method = req.getParameter("method");
         if ("add".equals(method)) {
             add(req, resp);
         }
     }

     public void add(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
         req.setCharacterEncoding("utf-8");
         String username = req.getParameter("username");
         String password = req.getParameter("password");
         String sex = req.getParameter("sex");
         String name = req.getParameter("name");
         String stuname = req.getParameter("stuname");
         String email = req.getParameter("email");
         String xueyuan = req.getParameter("xueyuan");
         String xi= req.getParameter("xi");
         String banji= req.getParameter("banji");
         String year= req.getParameter("year");
         String address= req.getParameter("address");
         String addtext= req.getParameter("addtext");
         User user = new User(username,password,sex,name,stuname,email,xueyuan,xi,banji,year,address,addtext);

         Dao dao =new Dao();
         boolean f=dao.add(user);

         if(f) {
             req.setAttribute("message", "注册成功！");
             req.getRequestDispatcher("users.jsp").forward(req,resp);
         }
         else {
             req.setAttribute("message", "注册失败！");
             req.getRequestDispatcher("users.jsp").forward(req,resp);
         }
     }
 }

 <%@ page language="java" contentType="text/html; charset=UTF-8"
     pageEncoding="UTF-8"%>
 <!DOCTYPE html>
 <html>
 <head>
 <meta charset="UTF-8">
 <title>Insert title here</title>
 <script>

 </script>
 </head>

     <body>
     <%
         Object message = request.getAttribute("message");
         if (message != null && !"".equals(message)) {
     %>
     <script type="text/javascript">
               alert("<%=request.getAttribute("message")%>");
     </script>
     <%
         }
     %>

         <table border="0px" cellpadding="10px" cellspacing="0px"
                 style="width: 50%;margin:auto;background:rgb(195,195,195)"  bordercolor="red" >
                     <form action="Servlet?method=add" method="post"
             onsubmit="return check()">
             <caption>当前位置：添加学生信息</caption>

                 <tr>
                     <td>登录账号:</td>
                     <td><input type="text" name="username"></td>
                 </tr>
                 <tr>
                     <td>登录密码:</td>
                     <td><input type="password" name="password"></td>
                 </tr>
                 <tr>
                     <td>性别:</td>
                     <td>
                     <select name="sex">
                             <option value="男">男</option>
                             <option value="女">女</option>
                       </select>
                     </td>
                 </tr>
                 <tr>
                     <td>姓名:</td>
                     <td><input type="text" name="name"></td>
                 </tr>
                 <tr>
                      <td>学号:</td>
                     <td><input type="text" name="stuname"></td>
                 </tr>
                   <tr>
                     <td>电子邮箱:</td>
                     <td><input type="text" name="email"></td>
                 </tr>
                 <tr>
                     <td>所在学院:</td>
                     <td><input type="text" name="xueyuan"></td>
                 </tr>
                  <tr>
                     <td>所在系:</td>
                     <td><input type="text" name="xi"></td>
                 </tr>
                 <tr>
                     <td>所在班级:</td>
                     <td><input type="text" name="banji"></td>
                 </tr>
                 <tr>
                     <td>入学年份(届):</td>
                     <td>
                         <select name="year">
                             <option value="1998">1998</option>
                             <option value="1999">1999</option>
                             <option value="2000">2000</option>
                             <option value="2001">2001</option>
                             <option value="2002">2002</option>
                             <option value="2003">2003</option>
                             <option value="2004">2004</option>
                             <option value="2005">2005</option>
                             <option value="2006">2006</option>
                             <option value="2007">2007</option>
                             <option value="2008">2008</option>
                             <option value="2009">2009</option>
                             <option value="2010">2010</option>
                             <option value="2011">2011</option>
                             <option value="2012">2012</option>
                             <option value="2013">2013</option>
                             <option value="2014">2014</option>
                             <option value="2015">2015</option>
                             <option value="2016">2016</option>
                             <option value="2017">2017</option>
                             <option value="2018">2018</option>
                             <option value="2019">2019</option>
                         </select>
                     </td>
                 </tr>
                  <tr>
                     <td>生源地:</td>
                     <td><input type="text" name="address"></td>
                 </tr>
                  <tr>
                     <td>
                                     备注:
                     </td>
                     <td>
                     <input type="text" name="addtext" >
                     </td>
                 </tr>
                 <tr>
                     <th colspan="2">
                         <input type="submit" value="添加">
                     </th>
                 </tr>
             </form>
         </table>
     </body>
 </html>

效果截图