<%@ page language="java" contentType="text/html; charset=utf-8"
import="java.sql.*" import="javax.servlet.http.HttpSession"%>
<%@ page import="java.sql.Connection" %>
<%@ page import="java.sql.DriverManager" %>
<%@ page import="java.sql.SQLException" %>
<%@ page import="java.sql.PreparedStatement" %>
<!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>登录验证</title>
</head>
<body>
<jsp:useBean id="db1" class="bean.Bean" scope="page" />
<%
request.setCharacterEncoding("utf-8");
String jgname = (String) request.getParameter("user");
System.out.print("登陆验证界面的username:" + jgname);
String jgpassword = (String) request.getParameter("pwd");
System.out.print("登陆验证界面的jgpassword:" + jgpassword);
//先验证是否为形式审核员或者技术审核员，如果都不是再判断是不是普通用户
if (jgname.equals("xsadmin")&& jgpassword.equals("xsadmin")) {
session.setAttribute("jgname", jgname);
response.sendRedirect("xsadminmain.jsp?jgname=" + jgname);
}
else if (jgname.equals("jsadmin")&& jgpassword.equals("jsadmin")) {
session.setAttribute("jgname", jgname);
response.sendRedirect("jsadminmain.jsp?jgname=" + jgname);
}
else{
String sql = "select username,password from user";
ResultSet rs = db1.executeQuery(sql);
while (rs.next()) {
String name=rs.getString(1);
String password=rs.getString(2);
if (jgname.equals(name) && jgpassword.equals(password)) {
session.setAttribute("jgname", jgname);
response.sendRedirect("main.jsp?jgname=" + jgname);
}
}
out.print("<script language=‘javaScript‘> alert(‘用户名或密码错误，请重新输入‘);</script>");
response.setHeader("refresh", "0;url=denglu.jsp");
rs.close();
}
db1.close();
%>
</body>
</html>
对于登陆界面进行了完善
原文：https://www.cnblogs.com/sunhongbin/p/13866062.html