JavaWeb编写登录注册案例并把数据插入MySQL数据库中

小白学习了这么久的java，第一次上手编写一个完整的登录以及注册案例，麻雀虽小五脏俱全！！！！

案例：

登录和注册

第一：所需创建的包以及相关类

1，domain包（也就是平时所说的Javabean），类：User——提供get/set方法。

2，servicer包，类：UserServer类——与用户相关的业务类。

3，dao包，类UserDao——与与用户相关的数据类。

4，servlet包，类： LoginServlet和RegistServlet

5，JSP页面：   login.jsp --> 登录表单
   regist.jsp --> 注册表单
  index.jsp --> 主页(只有登录成功才能看到)

第二：搭建空项目

1，domain包的类User：

package domain;

/*

 * 实体类

 * */

public class User {

	private String userName;

	private String passWord;

	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;

	}

	@Override

	public String toString() {

		return "User [userName=" + userName + ", passWord=" + passWord + "]";

	}

}

2，servicer包类：UserServer

package Server;

import domain.User;

/*user的业务层

 *

 * */

public class UserServer {

	 private User UserServer =new User();

}

3，dao包类UserDao

package dao;

/*

 * 访问数据库

 * */

public class UserDao {

}

4，servlet包,类： LoginServlet和RegistServlet

package Servlet;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import Server.UserServer;

/*

 * userServlet层

 * */

public class LoginServlet extends HttpServlet {

	public void doGet(HttpServletRequest request, HttpServletResponse response)

			throws ServletException, IOException {

		request.setCharacterEncoding("utf-8");

		response.setContentType("text/html;charset=utf-8");

		UserServer userservlet =new UserServer();

	}

}

package Servlet;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import Server.UserServer;

public class RegistServlet extends HttpServlet {

	public void doGet(HttpServletRequest request, HttpServletResponse response)

			throws ServletException, IOException {

		request.setCharacterEncoding("utf-8");

		response.setContentType("text/html;charset=utf-8");

		UserServer userservlet =new UserServer();

	}

}

5，jsp页面：

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<%@ taglib prefix="0" uri="http://java.sun.com/jsp/jstl/core"%>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <base href="<%=basePath%>">

    <title>My JSP 'Login.jsp' starting page</title>

	<meta http-equiv="pragma" content="no-cache">

	<meta http-equiv="cache-control" content="no-cache">

	<meta http-equiv="expires" content="0">

	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

	<meta http-equiv="description" content="This is my page">

  </head>

  <body>

   <form method="post" action="action=" <c:url value='/LoginServlet'/>"">

   	用户名：<input type="text" name="username"><br>

   	密码：<input type="password" name="password"><br>

   	<input type="submit" value="提交">

   	<input type="reset" value="重置">

   	<a href="regist.jsp">点击注册</a>

   </form>

  </body>

</html>

regist.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<%@ taglib prefix="0" uri="http://java.sun.com/jsp/jstl/core"%>

  <head>

    <title>My JSP 'regist.jsp' starting page</title>

	<meta http-equiv="pragma" content="no-cache">

	<meta http-equiv="cache-control" content="no-cache">

	<meta http-equiv="expires" content="0">

	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

	<meta http-equiv="description" content="This is my page">

  </head>

  <body>

     <form method="post" action=" <c:url value='/RegistServlet'/>">

   	用户名：<input type="text" name="username"><br>

   	密码：<input type="password" name="password"><br>

   	确认密码：<input type="password" name="password"><br>

   	<input type="submit" value="提交">

   	<input type="reset" value="重置">

   </form>

  </body>

</html>

index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <base href="<%=basePath%>">

    <title>My JSP 'index.jsp' starting page</title>

	<meta http-equiv="pragma" content="no-cache">

	<meta http-equiv="cache-control" content="no-cache">

	<meta http-equiv="expires" content="0">

	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

	<meta http-equiv="description" content="This is my page">

	<!--

	<link rel="stylesheet" type="text/css" href="styles.css">

	-->

  </head>

  <body>

    欢迎登陆到任性的代码的博客<a href="https://blog.csdn.net/qq_31539817"></a><br>

  </body>

</html>

第三：数据库设计：

mysql> create database USER;

mysql> CREATE TABLE USERINFO

    -> (USERNAME VARCHAR(50),

    -> PASSWORD VARCHAR(50));

mysql> SHOW TABLES;

+----------------+

| Tables_in_user |

+----------------+

| userinfo       |

+----------------+

1 row in set (0.00 sec)

mysql> DESC UESRINFO

    -> ;

ERROR 1146 (42S02): Table 'user.uesrinfo' doesn't exist

mysql> DESC USERINFO;

+----------+-------------+------+-----+---------+-------+

| Field    | Type        | Null | Key | Default | Extra |

+----------+-------------+------+-----+---------+-------+

| USERNAME | varchar(50) | YES  |     | NULL    |       |

| PASSWORD | varchar(50) | YES  |     | NULL    |       |

+----------+-------------+------+-----+---------+-------+

2 rows in set (0.01 sec)

mysql>

第四：编写代码

资源包：https://download.csdn.net/download/qq_31539817/11445397

第五：说明

很多逻辑业务没用做，比如判断用户名是否重复，用户和密码是否符合规范，没有加样式等，这些功能可以自己添加。如果没有c币下载可以留言（csdn真尼玛币坑，c币还会过期，我的全部c币都过期了，坑人的傻逼网站）。