📄 user_login_check_exp.jsp
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<%@ page contentType="text/html; charset=gb2312" language="java"%>
<%@ page import="java.sql.*,java.util.regex.*"%>
<!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>用户登录</title>
</head>
<body>
<%
String s_UserName = request.getParameter("UserName");
String s_UserPassword = request.getParameter("UserPassword");
Pattern p=null;
Matcher m=null;
try
{
p = java.util.regex.Pattern.compile("[^0-9A-Za-z]");
m = p.matcher(s_UserName);
if(m.matches())
{
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;
strSql = "select * from users where UserName like '"+s_UserName+"' and UserPassword like '"+s_UserPassword+"'";
rs = stmt.executeQuery(strSql);
if(rs.next())
{
out.println("<h1 align=center>用户登录成功！</h1>");
}
else
{
out.println("<h1 align=center>您输入的用户名和密码有误！</h1>");
out.println("<div align=center><input type=button name=btn 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=btn1 value=返回 onClick='window.history.go(-1)'></div>");
}
}
else
{
out.println("<h1 align=center>用户名只能是字母或数字！</h1>");
out.println("<div align=center><input type=button name=btn2 value=返回 onClick='window.history.go(-1)'></div>");
}
}
catch(Exception e)
{
}
%>
</body>
</html>
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