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JSP+JDBC
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>登陆界面</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>
<form action="validate.jsp" method="post">
用户登录<br>
姓名:<input type="text" name="username"/><br>
密码:<input type="text" name="pswd"/><br>
<input type="submit" value="登录"/>
</form>
</body>
</html>validate.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8" import="java.sql.*" %>
<jsp:useBean id="MySqlBean" scope="page" class="edu.qdgxy.jdbc.MySQLConnBean" />
<%
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 'validate.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>
<body>
<%
String username=request.getParameter("username");
String pswd=request.getParameter("pswd");
boolean validated=false;
String sql="select * from user";
MySqlBean.OpenConn();
ResultSet rs=MySqlBean.executeQuery(sql);
while(rs.next()){
if((rs.getString("username").compareTo(username)==0)&&(rs.getString("pswd").compareTo(pswd)==0)){
validated=true;
}
}
rs.close();
MySqlBean.closeStmt();
MySqlBean.closeConn();
if(validated){
%>
<jsp:forward page="welcome.jsp"/>
<%
}
else{
%>
<jsp:forward page="error.jsp"/>
<%
}
%>
</body>
</html>MySQLConnBean.java请参考http://blog.csdn.net/jxq0816/article/details/20442603
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