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=" 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