对简易网页版注册系统的制作(连接MySQL数据库）

一.基本需求

二.设计思路:

　　　　1.首先创建一个与数据库数据属性对应的类User，并添加get和set方法。

　　　　2.之后建立另一个类UserDao用于生成一条完整的数据对象。

　　　　3.再建立一个类DButil用于与数据库的连接

　　　　4.最后建立一个类AddUserServlet用于对数据库的内容进行添加操作

　　　　5.同时还要写一个JSP文件完成界面的呈现和细节要求的实现

三.源代码:

　　　　1.User类：

package bean;

public class User {

private int id;
private String username;
private String password;
private String name;
private String sex;
private String num;
private String xueyuan;
private String mail;
private String xi;
private String classes;
private String year;
private String home;
private String other;
public User() {
  super();
}
public User(int id, String username,String num, String password,String name,String sex,String mail,String xueyuan,String xi,String classes,String year,String home,String other) {
  super();
  this.id = id;
  this.username = username;
  this.password = password;
  this.name = name;
  this.sex = sex;
  this.num =num;
  this.xueyuan = xueyuan;
  this.classes=classes;
  this.home=home;
  this.other=other;
  this.xi=xi;
  this.mail = mail;
  this.year=year;

}

public int getId() {
  return id;
}
public void setId(int id) {
  this.id = id;
}
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 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 getNum() {
  return num;
}
public void setNum(String num) {
  this.num = num;
}
public String getXueyuan() {
  return xueyuan;
}
public void setXueyuan(String xueyuan) {
  this.xueyuan = xueyuan;
}
public String getMail() {
  return mail;
}
public void setMail(String mail) {
  this.mail = mail;
}
public String getXi() {
  return xi;
}
public void setXi(String xi) {
  this.xi = xi;
}
public String getClasses() {
  return classes;
　　　　　　}
public void setClasses(String classes) {
  this.classes = classes;
}
public String getYear() {
  return year;
}
public void setYear(String year) {
  this.year = year;
}
public String getHome() {
  return home;
}
public void setHome(String home) {
  this.home = home;
}
public String getOther() {
  return other;
}
public void setOther(String other) {
  this.other = other;
}
public String toString() {
  return "User [id=" + id + ", userName=" + username + ", password=" + password + "]";
}

}

2.UserDao类：

package dao;

import bean.User;
import util.DButil;
import java.sql.*;

public class UserDao {

/**
* 生成单例
*/
DButil DB =new DButil();
private static UserDao userDao =new UserDao();

public static UserDao getUserDao()
{
return userDao;

}
public boolean addUser(User user)
{
   String sql="insert into info(username,password,sex,name,num,mail,xueyuan,xi,class,year,home,other)values(?,?,?,?,?,?,?,?,?,?,?,?)";
   Connection conn =null;
   PreparedStatement ps=null;
   boolean flag =false;
   try {
  conn=DB.getConn();
  ps=conn.prepareStatement(sql);
  ps.setString(1, user.getUsername());
  ps.setString(2, user.getPassword());
  ps.setString(3, user.getSex());
  ps.setString(4, user.getName());
  ps.setString(5, user.getNum());
  ps.setString(6, user.getMail());
  ps.setString(7, user.getXueyuan());
  ps.setString(8, user.getXi());
  ps.setString(9, user.getClasses());
  ps.setString(10, user.getYear());
  ps.setString(11, user.getHome());
  ps.setString(12, user.getOther());
  int a=ps.executeUpdate();
  if(a!=0)
  {
   flag =true;
  }
} catch (Exception e) {
  // TODO: handle exception
  e.printStackTrace();
}
   finally {
  DB.close(conn);
  DB.close(ps);
}
return flag;

}

}

3.DButil类：

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

/**
* 数据库的工具类
*
* @author
*
*/
public final class DButil {

/**
* 数据库的连接函数
* 可修改的
*
* @return 数据库的连接
*/
public Connection getConn()
{
  Connection connection =null;
  // student 为数据库名称？后面加的是条件
  String db_url="jdbc:mysql://localhost:3306/user?serverTimezone=UTC";
  try {
   Class.forName("com.mysql.cj.jdbc.Driver");
   connection = DriverManager.getConnection(db_url, "root", "123456");
   System.out.println("Success connect MySql server!");

  } catch (Exception e) {

  }



  return connection;
}

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

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


}

public void close(PreparedStatement ps) {
  if (ps != null) {
   try {
    ps.close();
   } catch (SQLException e) {
    e.printStackTrace();
   }
  }


}
public void close(ResultSet rs) {
  if (rs != null) {
   try {
    rs.close();
   } catch (SQLException e) {
    e.printStackTrace();
   }
  }

}
}

4.AddUserServlet类：

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 bean.User;
import dao.UserDao;

/**
* Servlet implementation class AddUserServlet
*/
@WebServlet("/AddUserServlet")
public class AddUserServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#HttpServlet()
     */
    public AddUserServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  // TODO Auto-generated method stub
  int s=0;
  request.setCharacterEncoding("utf-8");
  String username=request.getParameter("username");
  String num=request.getParameter("num");
  String password=request.getParameter("password");
  String name=request.getParameter("name");
  String sex=request.getParameter("sex");
  String mail=request.getParameter("mail");
  String xueyuan=request.getParameter("xueyuan");
  String xi=request.getParameter("xi");
  String classes=request.getParameter("class");
  String year=request.getParameter("year");
  String home=request.getParameter("home");
  String other=request.getParameter("other");
  User user=new User();
  user.setUsername(username);
  user.setPassword(password);
  user.setName(name);
  user.setSex(sex);
  user.setNum(num);
  user.setXueyuan(xueyuan);
  user.setMail(mail);
  user.setXi(xi);
  user.setClasses(classes);
  user.setYear(year);
  user.setHome(home);
  user.setOther(other);


  UserDao userDao=UserDao.getUserDao();
  if(userDao.addUser(user))
  {

   request.setAttribute("message", "添加成功");
   request.getRequestDispatcher("addUser.jsp").forward(request,response);
   }

  else
  {
   if(s==1)
   {request.setAttribute("message", "添加失败");
   request.getRequestDispatcher("addUser.jsp").forward(request,response);
   }
   else if(s==0)
   {request.getRequestDispatcher("addUser.jsp").forward(request,response);
   s=1;}
   }


}

/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}

}

5.JSP:

<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>login</title>
<style>
</style>

</head>
<body>
<%
      Object message = request.getAttribute("message");
      if(message!=null && !"".equals(message)){

%>
      <script type="text/javascript">
           alert("<%=request.getAttribute("message")%>");
      </script>
<%} %>
<form action="AddUserServlet" method="post" onsubmit="return check()">

</select>届
<br>

生源地:<input id ="home" name="home" type="text">
<br>

备注:<input id ="other" name="other" type="text">
<br>

   <input type="submit" value="注册">

</div>
</form>
<script type="text/javascript">
var reg=/^[a-zA-Z]\w*$/;
var flag1=false,flag2=false,flag3=false;
function chang1(obj)
{
if(obj.length<6||name.length>12)
{
alert("用户名要求6-12位");  }
if(!reg.test(obj))
{
alert("用户名由字母开头，后字母、数字或下划线!");
}

}
function chang2(obj)
{
if(obj.length<8)
{
alert("密码要求8位以上"); }

}

function chang3(obj)
{
if(obj.length!=8)
{
  alert("学号为8位");
}
else if(obj.length==8)
{
var fdStart = obj.indexOf("2018");
    if(fdStart !=0){
alert("学号应以2018开头");
}

}
}
function chang4(obj)
{

        if(obj.length!=0){
        reg=/^\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$/;
        if(!reg.test(obj)){
            alert("对不起，您输入的邮箱格式不正确!");//请将“字符串类型”要换成你要验证的那个属性名称！
        }
        }
}

</script　　>

</body>

</html>

对简易网页版注册系统的制作(连接MySQL数据库）

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