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【JAVAEE】实现账号注册的功能

JAVA

1.编写javaBean的用户类和连接数据库类

User.java

package com.bean;

public class User {
    private int id;
    private String name;
    private String pwd;
    private int power;
    public User() {}
    public User(int id,String name,String pwd,int power) {
        this.id=id;
        this.name=name;
        this.pwd=pwd;
        this.power=power;
    }
    public User(String name,String pwd) {
        this.pwd=pwd;
        this.name=name;
    }
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getPwd() {
        return pwd;
    }
    public void setPwd(String pwd) {
        this.pwd = pwd;
    }
    public int getPower() {
        return power;
    }
    public void setPower(int power) {
        this.power = power;
    }
}

Dbconnect.java

package com.bean;

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

public class DbConnect {
    public static Connection getDBconnection() {
        String shujuku = "benzhu";
        String url1 ="jdbc:mysql://localhost:3306/"+shujuku;
        String uname = "root";
        String upwd="123456";
        Connection conn=null;
        try{
            Class.forName("com.mysql.jdbc.Driver");
            conn= DriverManager.getConnection(url1, uname, upwd);
            System.out.println("哈哈哈哈 连接成功");
        }
        catch(Exception e){
            e.printStackTrace();
        }
        return conn;
    }
    public static void Close(Connection conn,Statement stmt,ResultSet rs) {
        try{if(rs!=null) rs.close();}catch(Exception e){e.printStackTrace();}
        try{if(stmt!=null) stmt.close();}catch(Exception e){e.printStackTrace();}
        try{if(conn!=null) conn.close();}catch(Exception e){e.printStackTrace();}
    }
}

2.编写插入数据库数据和查询重名的dao方法

serDao.java

package com.dao;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;

import com.bean.DbConnect;
import com.bean.User;

public class UserDao {
    public User findUserByname(String name) {
        User user1=null;
        try{
            Connection conn;
            conn = DbConnect.getDBconnection();
            Statement stmt = conn.createStatement();
            String sql="select * from benzhu_user where user_name=’"+name+"’";
            ResultSet rs=stmt.executeQuery(sql);
            if(rs.next()) {
                int id = rs.getInt(1);
                String name1 = rs.getString(2);
                String pwd = rs.getString(3);
                int power = rs.getInt(4);
                user1 = new User(id,name1,pwd,power);
            }
            else {
                int id= 0;
                String name1 = "name";
                String pwd = "pwd";
                int power = 0;
                user1 = new User(id,name1,pwd,power);
            }
            DbConnect.Close(conn, stmt, rs);
        }
        catch(Exception e){
            e.printStackTrace();
        }
        return user1;
    }
    public int findUserByuserz(User user) {
        int user1=0;
        try{
            Connection conn;
            conn = DbConnect.getDBconnection();
            String sql="insert into benzhu_user(user_name,user_pwd,user_power) values(?,?,1)";
            PreparedStatement st1 = conn.prepareStatement(sql);
            st1.setString(1, user.getName());
            st1.setString(2, user.getPwd());
            user1 = st1.executeUpdate();
            DbConnect.Close(conn, st1, null);

        }
        catch(Exception e){
            e.printStackTrace();
        }
        return user1;
    }
}

3.处理jsp提交页面的servlet

userRegServlet.java

package com.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 com.bean.User;
import com.dao.UserDao;

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

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.setCharacterEncoding("utf-8");
        String name = request.getParameter("username");
        String pwd = request.getParameter("userpwd");
        User user = new User(name,pwd);
        UserDao dao1 = new UserDao();
        request.setAttribute("u", name);
        if(dao1.findUserByname(name).getId()!=0) {
//存在同名用户
            request.getRequestDispatcher("byname/failure.jsp").forward(request, response);
        }
        else {
            if(dao1.findUserByuserz(user)!=0) {
                request.getRequestDispatcher("byname/input.jsp").forward(request, response);
            }
            else {
                request.getRequestDispatcher("byname/register.jsp").forward(request, response);
            }
        }
    }
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }

}

4.编写jsp页面

zhuce.jsp

<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>注册页面</title>

</head>
<script type="text/javascript" language="javascript">
function validate(){
var name=document.forms1.username.value;
var pwd=document.forms1.userpwd.value;
var pwd1=document.forms1.userpwd1.value;
if(name.length<=0) alert("用户名不能为空");
else if(pwd!=pwd1) alert("两次密码不一致！");
else document.forms1.submit();
}
</script>
<body>

<form action="../userRegServlet" method="post" name="forms1">
<h1 align="center">注册页面</h1>
用户名：<input type="text" name="username"/><br/>
密码：<input type="password" name="userpwd"/><br/>
确认密码：<input type="password" name="userpwd1"/><br/>
<input type="Button" value="注册" onClick="validate()"/>
<input type="reset"/>
</form>
</body>
</html>

input.jsp

<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>注册成功</title>
</head>
<body>
${requestScope.u }，注册成功！
<a href="byname/login.jsp">单击转跳登陆界面</a>
</body>
</html>

failure.jsp

<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
用户名${requestScope.u }已经被使用。
<a href="byname/zhuce.jsp">单击转跳重新注册</a>
</body>
</html>

register.jsp

<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>注册失败</title>
</head>
<body>
${requestScope.u }，注册失败，服务器错误！
<a href="byname/zhuce.jsp">单击转跳注册页面</a>
</body>
</html>

4.数据库文件

本地下载

5.效果图

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【JAVAEE】实现账号注册的功能

https://www.benzhu.xyz/archives/javaee007

作者

小猪

发布于

2018-04-12

更新于

2024-11-27

许可协议

CC BY 4.0

【JAVAEE】实现账号注册的功能

1.编写javaBean的用户类和连接数据库类

2.编写插入数据库数据和查询重名的dao方法

3.处理jsp提交页面的servlet

4.数据库文件

5.效果图

作者

发布于

更新于

许可协议

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