Java课堂测试

//Dao.java
package Dao;

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

import DBUtil.DBUtil;

import Entity.User;

public class Dao {

    public boolean add(User user) {
        // TODO Auto-generated method stub
        String sql = "insert into user(username,password,name,sex,address,tel,email,stnumber,school,classes,xi,time,beizhu) values('"+ user.getUsername() + "','"+ user.getPassword() +"','"+ user.getName() +"','" + user.getSex() +"','"+ user.getAddress() +"','"+ user.getTel() +"','"+user.getEmail()+"','" + user.getStnumber() +"','" + user.getSchool() +"','" + user.getClasses() +"','" + user.getXi() +"','" + user.getTime() +"','" + user.getBeizhu() +"')";
        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;

}
}

//DBUtil.java
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;

/**
 * ���ݿ����ӹ���
 * @author W
 *
 */
public class DBUtil {
    
    public static String db_url = "jdbc:mysql://localhost:3306/user";
    public static String db_user = "root";
    public static String db_pass = "0000";
    
    public static Connection getConn () {
        Connection conn = null;
        
        try {
            Class.forName("com.mysql.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 user";//select
        pstmt = conn.prepareStatement(sql);
        rs = pstmt.executeQuery();
        if(rs.next()){
            System.out.println("空");
        }else{
            System.out.println("不空");
        }
    }
}

//User.java
package Entity;

public class User {
    
    private String username;
    private String password;
    private String name;
    private String sex;
    private String address;
    private String tel;
    private String email;
    private String stnumber;
    private String school;
    private String classes;
    private String xi;
    private String time;
    private String beizhu;
    
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    
    public String getPassword() {
        return password;
    }
    public void setPassssword(String password) {
        this.password = password;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getSex() {
        return sex;
    }
    public void setSex(String sex) {
        this.sex = sex;
    }
    public String getAddress() {
        return address;
    }
    public void setAddress(String address) {
        this.address = address;
    }
    public String getTel() {
        return tel;
    }
    public void setTel(String tel) {
        this.tel = tel;
    }
    
    public String getEmail() {
        return email;
    }
    public void setEmail(String email) {
        this.email = email;
    }
    public String getStnumber() {
        return stnumber;
    }
    public void setStnumber(String stnumber) {
        this.stnumber=stnumber;
    }public String getSchool() {
        return school;
    }
    public void setSchool(String school) {
        this.school=school;
    }
    public String getClasses() {
        return classes;
    }
    public void setClasses(String classes) {
        this.classes=classes;
    }
    public String getXi() {
        return xi;
    }
    public void setXi(String xi) {
        this.xi=xi;
    }
    public String getTime() {
        return time;
    }
    public void setTime(String time) {
        this.time=time;
    }public String getBeizhu() {
        return beizhu;
    }
    public void setBeizhu(String beizhu) {
        this.beizhu=beizhu;
    }
    public User() {}
    
public User(String username,String password,String name,String sex,String address,String tel,String email,String stnumber,String school,String classes,String xi,String time,String beizhu) {
        
        
        this.username=username;
        this.password=password;
        this.name=name;
        this.sex=sex;
        this.address=address;
        this.tel=tel;
        this.email=email;
        this.stnumber=stnumber;
        this.school=school;
        this.classes=classes;
        this.xi=xi;
        this.time=time;
        this.beizhu=beizhu;
    }
    

}

//Servlet.java
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);
        } 
    }
    
    
    private void add(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
        req.setCharacterEncoding("utf-8");
        String username = req.getParameter("username");
        String password = req.getParameter("password");
        String name = req.getParameter("name");
        String sex = req.getParameter("sex");
        String address = req.getParameter("address");
        String tel = req.getParameter("tel");
        String email = req.getParameter("email");
        String stnumber = req.getParameter("stnumber");
        String school = req.getParameter("school");
        String classes = req.getParameter("classes");
        String xi = req.getParameter("xi");
        String time = req.getParameter("time");
        String beizhu = req.getParameter("beihzhu");
        User user = new User(username,password,name,sex,address,tel,email,stnumber,school,classes,xi,time,beizhu);
        
        Dao dao =new Dao();
        boolean f=dao.add(user);
        
        
        if(f) {
            req.setAttribute("message", "注册成功！");
            req.getRequestDispatcher("user.jsp").forward(req,resp);
        } else {
            req.setAttribute("message", "注册失败！");
            req.getRequestDispatcher("user.jsp").forward(req,resp);
        }
    }
}

//user.jsp
<%@ 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>

</head>
    
    <body>
    <%
        Object message = request.getAttribute("message");
        if (message != null && !"".equals(message)) {
    %>
    <script type="text/javascript">
              alert("<%=request.getAttribute("message")%>");
    </script>
    <%
        }
    %>
    
    
        <table border="1px" cellpadding="15px" cellspacing="0px"
                style=" 30%;margin:auto;background:rgb(195,195,195)"  bordercolor="red" >
                    <form action="Servlet?method=add" method="post"onsubmit="return check(this)">
            <caption>注册用户</caption>
          
             
                <tr>
                    <th>用户名:</th>
                    <td><input type="text" name="username"></th>
                </tr>
                <tr>
                    <th>密码:</th>
                    <td><input type="password" name="password"></td>
                </tr>
               
                <tr>
                    <th>姓名:</th>
                    <td><input type="text" name="name"></td>
                </tr>
                <tr>
                    <th>性别:</th>
                    <td>
                        <input type="radio" name="sex" checked="checked" value="男">男 &nbsp;&nbsp;
                        <input type="radio" name="sex" value="女">女
                    </td>
                </tr>
                <tr>
                    <th>生源地:</th>
                    <td><input type="text" name="address"></td>
                </tr>
                 <tr>
                    <th>手机号:</th>
                    <td><input type="text" name="tel"></td>
                </tr>
             <tr>
                    <th>邮箱:</th>
                    <td><input type="text" name="email"></td>
                </tr>
                <tr>
                    <th>学号:</th>
                    <td><input type="text" name="stnumber"></td>
                </tr>
                <tr>
                    <th>学校:</th>
                    <td><input type="text" name="school"></td>
                </tr>
                <tr>
                    <th>班级:</th>
                    <td><input type="text" name="classes"></td>
                </tr>
                <tr>
                    <th>系:</th>
                    <td><input type="text" name="xi"></td>
                </tr>
                <tr>
                    <th>入学年份:</th>
                    <td>
                        <select name="time">
                            <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>
                            <option value="2020">2020</option>
                            <option value="2021">2021</option>
                        </select>
                    </td>
                </tr>
                <tr>
                    <th>备注:</th>
                    <td><input type="text" name="beizhu"></td>
                </tr>
                <tr>
                    <th colspan="2">
                        <input type="submit" value="提交">&nbsp;&nbsp;&nbsp;&nbsp;
                        <input type="reset" value="重置">
                    </th>
                </tr>
            </form>
        </table>
    <script type="text/javascript">
function check(form){
    if(form.username.value.length<6 || form.username.value.length>12 || new RegExp("[^a-zA-Z0-9_u4e00-u9fa5]").test(form.username.value)){
        alert("登陆账号必须由6-12位英文字符或数字或下划线组成！");
        form.username.focus();
        return false;
    }
    if(new RegExp("[^a-zA-Z]").test(form.username.value.substring(0,1))){
        alert("登陆账号必须以英文字母开头！");
        form.username.focus();
        return false;
    }
    if(form.password.value.length < 8 || new RegExp("[^0-9]").test(form.password.value)){
        alert("密码由八位以上数字或字母组成！");
        form.password.focus();
        return false;
    }
    
    //以数字字母开头，中间可以是多个数字字母或下划线；然后是“@”；然后是数字字母；然后是“.”；最后是2-4个字母结尾
    var regex = /^([a-zA-Z]|[0-9])(w|-)+@[a-zA-Z0-9]+.([a-zA-Z]{2,4})$/;
    if(!regex.test(form.email.value)){
        alert("邮箱格式错误！");
        form.email.focus();
        return false;
    }
    return true;
}
</script>
    </body>
</html>