本文介绍了一个基于JSP的简易登录系统的实现过程。该系统通过web.xml进行配置，并使用了index.jsp、login.jsp和loginSuccess.jsp三个页面。用户输入用户名和密码后，系统将验证这些信息并重定向到相应的页面。
web.xml
<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd"><web-app> <display-name>jspLogin</display-name></web-app>
index.jsp
<%
if(session.getAttribute("passed")==null)...{
response.sendRedirect("login.jsp"); return;
}%>passed!
login.jsp
<%...@ page contentType="text/html; charset=utf-8" %><html><head><title>login</title></head><body bgcolor="#ffffff"><%...String flag=request.getParameter("flag");if(flag!=null&&flag.equals("0")){ out.println("Pls input valid username and password!<br><br>");}%><form name="form1" method="post" action="loginSuccess.jsp"><input name="username" type="text"><br/><input name="password" type="password"><br/><input name="reset" type="reset" value="reset"><input name="submit" type="submit" value="submit"></form></body></html>
loginSuccess.jsp
<%@ page import="java.sql.*"%><%String username=request.getParameter("username");String password=request.getParameter("password");String sql="select * from user where username='"+username+"' and password='"+password+"'";boolean flag=false;//Class.forName("com.mysql.jdbc.Driver") ;Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/test?user=cwb&password=cwb123&useUnicode=true");Statement pstmt = conn.prepareStatement(sql) ;ResultSet rs = pstmt.executeQuery(sql);if(rs.next()) ...{flag = true ;}//rs.close() ;pstmt.close() ;conn.close() ;if(flag)...{ session.setAttribute("passed","true"); response.sendRedirect("index.jsp");}else...{ response.sendRedirect("login.jsp?flag=0");}%>
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