java+jsp+mysql实现登入注册识别功能
注册
1. 注册的前端代码 register.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ taglib prefix="c" 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>注册模块</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">
-->
<body>
<body background="file:///Users/apple/Desktop/java/DonTai/WebContent/css/images/9f187d8d12874b12dcb614a55749959e.jpg"
style=" background-repeat:no-repeat ;
background-size:100% 100%;
background-attachment: fixed;"
>
<center>
<br>
<br>
<font face="楷体" size="6" color="#000">注册界面</font>
<form action = "jq.jsp" method = "post" >
<br>
<br>
<br>
<table width="300" height="180" border="0" bordercolor="#A0A0A0">
身 份：
<select class="INPUT_text" name="userType">
<option value="-1" selected="selected">请选择注册的身份</option>
<option value="0">管理员</option>
<option value="1">普通成员</option>
</select>
<tr>
<th>注册识别码：</th>
<td><input type="text" name="recognition" maxlength = "16" ></td>
</tr>
<tr>
<th>真实姓名：</th>
<td><input type="text" name="username" maxlength = "17" ></td>
</tr>
<tr>
<th>输入密码：</th>
<td><input type="text" name="password" maxlength = "20" ></td>
</tr>
<tr>
<th>确认密码：</th>
<td><input type="text" name="newword" maxlength = "20"></td>
</tr>
<tr>
<td colspan="2" align="center">
<input type="submit" value="注 册">
<input type="reset" value="重 置">
<input type="reset" value="关 闭"onclick ="window.close()">
</td>
</tr>
</table>
</form>
</center>
</body>
</html>2.封装好JDBC(可运行进行测试是否连接好了数据库)
运行这段代码之前，请加入mysql的JDBC jar包
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
public class DBUtils { // Math.PI
public static final String DRIVER = "com.mysql.cj.jdbc.Driver";
public static final String URL = "jdbc:mysql://localhost:3306/db01";..**// 最后db01为你的数据库名字**
public static final String USER = "root"; **//mysql的登入账号(一般默认为root)**
public static final String PASSWORD = "12345678";**//密码**
static {
try {
Class.forName(DRIVER);
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}
public static Connection getConnection() throws Exception {
return DriverManager.getConnection(URL, USER, PASSWORD);
}
public static void closeAll(ResultSet rs, PreparedStatement prep, Connection conn) throws Exception {
if (rs != null) {
rs.close();
}
if (prep != null) {
prep.close();
}
if (conn != null) {
conn.close();
}
}
public static void main(String[] args) throws Exception {
Connection conn = getConnection();
System.out.println(conn);
}
}3.数据库层
mysql的代码为下
use db01
create table userr(
UName varchar(20),
x_password varchar(20)，
recognition int //传入0和1来对后面的进行识别身份
);**4.注册时候按你的识别码进行（普通成员/管理员）注册
普通成员的注册码为 711 管理员为7116**
4.注册指向的web后端 jsp代码 checkRegister.jsp
<%@ page language="java" import="java.util.*,java.sql.*"
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 'Feilong_chechRegister.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>
<%
try {
String user = new String(request.getParameter("username").getBytes("ISO-8859-1"), "UTF-8");
String pwd = request.getParameter("password");
String newwrod = request.getParameter("newword");
String userType = request.getParameter("userType");//身份
String recognition = request.getParameter("recognition");//识别码
Class.forName("com.mysql.cj.jdbc.Driver").newInstance();
//如果显示没有这个包,需要下载connect for java并添加相应jar包
String databaseName = "db01";// 确保在MySQL数据库中创建CREATE好的数据库。
String userName = "root";// MySQL默认的root账户名
String password = "12345678";// 默认的root账户密码为空,或者用户设置的密码
//端口号一般默认为3306,在安装mySQL时候可以自己修改.
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/" + databaseName, userName, password);
PreparedStatement pStmt = conn.prepareStatement("select * from userr where UName = '" + user + "'");
ResultSet rs = pStmt.executeQuery();
if (rs.next()) {
out.println(
"<script language='javascript'>alert('该用户已存在，请重新注册！');window.location.href='register.jsp';</script>");
}
//注册处理
else if (recognition.equals("711")&&userType.equals("0")) {
if(!newwrod.equals(pwd)){
out.println("<script language='javascript'>alert('2次密码不相同！');window.location.href='http://localhost:8080/DonTai/register.jsp';</script>");
}else{
PreparedStatement tmt = conn.prepareStatement("Insert into tb_user(UName,x_password,recognition) values('"
+ user + "','" + pwd + "','" + userType + "')");
int rst = tmt.executeUpdate();
if (rst != 0) {
out.println(
"<script language='javascript'>alert('管理员注册成功！');window.location.href='http://localhost:8080/DonTai/register.jsp';</script>");
} else {
out.println(
"<script language='javascript'>alert('管理员注册失败！');window.location.href='http://localhost:8080/DonTai/register.jsp';</script>");
}
}
}
else if (recognition.equals("7116")&&userType.equals("1")) {
if(!newwrod.equals(pwd)){
out.println("<script language='javascript'>alert('2次密码不相同！');window.location.href='http://localhost:8080/DonTai/register.jsp';</script>");
}else{
PreparedStatement tmt = conn.prepareStatement("Insert into tb_user(UName,x_password,recognition) values('"
+ user + "','" + pwd + "','" + userType + "',)");
int rst = tmt.executeUpdate();
if (rst != 0) {
out.println(
"<script language='javascript'>alert('普通成员注册成功！');window.location.href='http://localhost:8080/DonTai/register.jsp';</script>");
} else {
out.println(
"<script language='javascript'>alert('普通成员注册失败！');window.location.href='http://localhost:8080/DonTai/register.jsp';</script>");
}
}
}
else{
out.println("<script language='javascript'>alert('识别码输入有误（或者身份不匹配）');window.location.href='http://localhost:8080/DonTai/register.jsp';</script>");
}
} catch (Exception e) {
out.println(
"<script language='javascript'>alert('未输入用户名或密码');window.location.href='http://localhost:8080/DonTai/register.jsp';</script>");
}
%>
</body>5.登入部分 login.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 'Feilong_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>
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<body >
<body background="file:///Users/apple/Desktop/java/DonTai/WebContent/css/images/4a270715129080f2de2afddf4da638de.jpg"
style=" background-repeat:no-repeat ;
background-size:100% 100%;
background-attachment: fixed;"
>
<center>
<br> <br>
<td><div align="center"
style="FONT-WEIGHT: bold; FONT-SIZE: 40pt;">学生宿舍管理系统</div></td> <br>
<br> <br> <br> <br> <br> <br> <br>
<br>
<%
String flag = request.getParameter("errNo");
try {
if (flag != null)
out.println("用户名不存在或密码错误(身份未选或选择身份不符合)");
} catch (Exception e) {
e.printStackTrace();
}
%>
<form action="loginCh.jsp" method="post">
<table width="300" height="180" border="0" bordercolor="#A0A0A0">
<tr>
<th>账 户：</th>
<td><input type="text" name="name" maxlength="16"></td>
</tr>
<tr>
<th>密 码：</th>
<td><input type="password" name= "pwd" maxlength="20"></td>
</tr>
<tr>
<td colspan="2" align="center">
<input type="submit"
name="submit" value="登 录"> <input type="button"
value="返 回"bv
onclick="window.location.href='http://localhost:8080/DonTai/NewFile4.jsp'">
<input name="Submit2" type="reset" class="submit1" value="重置">
<br> <br> 身 份： <select
class="INPUT_text" name="userType">
<option value="-1" selected="selected">请选择登陆身份</option>
<option value="0">管理员</option>
<option value="1">普通成员</option>
</select>
</td>
</tr>
</table>
</form>
</center>
</body>
</html>6.登入的 jsp后端文件 login.jsp
根据数据库传过来的 0(管理员)和1(普通成员)来进行一个判断，然后指向相应. 身份的主页
<%@ page language="java" import="java.util.*,java.sql.*,java.net.*"
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 'Feilong_loginCh.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>
<%
//接收用户名和密码
String user = new String(request.getParameter("name").getBytes("ISO-8859-1"), "UTF-8");
String pwd = request.getParameter("pwd");
String userType = request.getParameter("userType");
Class.forName("com.mysql.cj.jdbc.Driver").newInstance();
//如果显示没有这个包,需要下载connect for java并添加相应jar包
String databaseName = "db01";// 确保在MySQL数据库中创建CREATE好的数据库。
String userName = "root";// MySQL默认的root账户名
String password = "12345678";// 默认的root账户密码为空,或者用户设置的密码
//端口号一般默认为3306,在安装mySQL时候可以自己修改.
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/" + databaseName, userName, password);
PreparedStatement pStmt = conn.prepareStatement("select * from tb_user where UName = '" + user
+ "' and P wd = '" + pwd + "' and userType= '" + userType + "' ");
ResultSet rs = pStmt.executeQuery();
if (rs.next()) {
session.setAttribute("name", user);//缓存用户名
int usetType = rs.getInt("userType");
if (usetType == 0) {
response.sendRedirect("frameset.jsp?username=" + URLEncoder.encode(user)); //解决乱码 (管理员主页)
} else if (usetType == 1) {
response.sendRedirect("frameset.jsp?username=" + URLEncoder.encode(user)); //普通成员
}
}
else {
response.sendRedirect("login.jsp?errNo");//密码不对返回到登陆
}
rs.close();
pStmt.close();
conn.close();
%>
</body>
</html>本人(初学者)原创代码
如果有不对地方还望见谅
谢谢支持
第一份博客 2019.3.20
本文章为转载内容，我们尊重原作者对文章享有的著作权。如有内容错误或侵权问题，欢迎原作者联系我们进行内容更正或删除文章。
