二楼是checklogin.jsp运行报错是: type Exception reportmessage /mesaps1/checklogin.jsp (line: 7, column: 0) The value for the useBean class attribute csai.db.DBConn is invalid.description The server encountered an internal error that prevented it from fulfilling this request.exception org.apache.jasper.JasperException: /mesaps1/checklogin.jsp (line: 7, column: 0) The value for the useBean class attribute csai.db.DBConn is invalid. org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:42) org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:408) org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:149) org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1237) org.apache.jasper.compiler.Node$UseBean.accept(Node.java:1182) org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2376) org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2428) org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2434) org.apache.jasper.compiler.Node$Root.accept(Node.java:475) org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2376) org.apache.jasper.compiler.Generator.generate(Generator.java:3503) org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:250)
<!DOCTYPE html PUBLIC "-//WAPFORUM//DTD XHTML Mobile 1.0//EN" "http://www.wapforum.org/DTD/xhtml-mobile10.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<%@ page contentType="text/html; charset=utf-8" language="java" import="java.sql.*" errorPage="" pageEncoding="UTF-8"%>
<%@page import="java.sql.*" %>
<%@page import="java.util.*" %>
<%@page import="csai.db.DBConn" %>
<jsp:useBean id="db" class="csai.db.DBConn" scope="page"></jsp:useBean>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
<meta name="viewport" content="width=device-width, minimum-scale=1.0, maximum-scale=1.5" />
<title>登录后台处理</title>
</head>
<body>
<%
try{
String username=request.getParameter("username");
String password=request.getParameter("password");
ResultSet rsstring=null;
String sqlstring="select * from register where UserName='"+username+"'and Password='"+password+"'";
rsstring=db.executeQuery(sqlstring);
String UserId="";
//用户已注册
if(rsstring.next()){
session.setAttribute("username", username);
response.sendRedirect("index.jsp");
}
//用户未注册
else{
session.setAttribute("username",null);
response.sendRedirect("loginfail.jsp");
}
rsstring.close();
}
catch(Exception e){
out.print("数据库异常,请联系管理员。详细信息如下:<br/>");
e.printStackTrace();
}
%>
</body>
</html>
type Exception reportmessage /mesaps1/checklogin.jsp (line: 7, column: 0) The value for the useBean class attribute csai.db.DBConn is invalid.description The server encountered an internal error that prevented it from fulfilling this request.exception org.apache.jasper.JasperException: /mesaps1/checklogin.jsp (line: 7, column: 0) The value for the useBean class attribute csai.db.DBConn is invalid.
org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:42)
org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:408)
org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:149)
org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1237)
org.apache.jasper.compiler.Node$UseBean.accept(Node.java:1182)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2376)
org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2428)
org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2434)
org.apache.jasper.compiler.Node$Root.accept(Node.java:475)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2376)
org.apache.jasper.compiler.Generator.generate(Generator.java:3503)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:250)
请看我的博客开源项目,也是基于spring开发的http://blog.csdn.net/shadowsick