注册验证java代码[针对上篇文章]

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https://www.ogeek.net/article/19801.htm

<%@ page contentType="text/html; charset=gb2312" language="java"%> 
<%@ page import="java.sql.*"%> 
<!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=gb2312"> 
<title>用户注册</title> 
</head> 
<body> 
<% 
String strSql=""; 
String database_username="root"; 
String database_password=""; 
String url="jdbc:mysql://localhost/ch3?useUnicode=true&characterEncoding=gb2312"; 
try 
{ 
Class.forName("org.gjt.mm.mysql.Driver"); 
Connection dbConn= DriverManager.getConnection(url,database_username,database_password); 
Statement stmt=dbConn.createStatement(); 
ResultSet rs=null; 
String s_UserName = request.getParameter("UserName"); 
strSql = "select * from users where UserName like '"+s_UserName+"'"; 
rs = stmt.executeQuery(strSql); 
if(rs.next()) 
{ 
out.println("<h1 align=center>用户名<font color=red>"+s_UserName+"</font>已经存在！</h1>"); 
out.println("<div align=center><input type=button name=btn value=返回 onClick='window.history.go(-1)'></div>"); 
} 
else 
{ 
String s_UserPassword = request.getParameter("UserPassword"); 
String s_NickName = request.getParameter("NickName"); 
String s_Sex = request.getParameter("Sex"); 
String s_Email = request.getParameter("Email"); 
strSql = "insert into users (UserName,UserPassword,NickName,Sex,Email) values('"+s_UserName+"','"+s_UserPassword+"','"+s_NickName+"','"+s_Sex+"','"+s_Email+"')"; 
try 
{ 
stmt.executeUpdate(strSql); 
out.println("<h1 align=center>用户注册成功，您的注册信息如下</h1>"); 
out.println("<p align=center>用户名：<font color=blue>"+s_UserName+"</font></p>"); 
out.println("<p align=center>密码：<font color=blue>"+s_UserPassword+"</font></p>"); 
out.println("<p align=center>昵称：<font color=blue>"+s_NickName+"</font></p>"); 
if(s_Sex.equals("0")) 
{ 
out.println("<p align=center>性别：<font color=blue>男</font></p>"); 
} 
else 
{ 
out.println("<p align=center>性别：<font color=blue>女</font></p>"); 
} 
out.println("<p align=center>Email：<font color=blue>"+s_Email+"</font></p>"); 
} 
catch(Exception ex) 
{ 
out.println("<h1 align=center>用户注册失败</h1>"); 
out.println("<div align=center><input type=button name=btn1 value=返回 onClick='window.history.go(-1)'></div>"); 
} 
} 
rs.close(); 
stmt.close(); 
dbConn.close(); 
} 
catch(Exception ex) 
{ 
out.println("<h1 align=center>数据库连接错误</h1>"); 
out.println("<div align=center><input type=button name=btn2 value=返回 onClick='window.history.go(-1)'></div>"); 
} 
%> 
</body> 
</html> 