jsp连接Bean出错
org.apache.jasper.JasperException: /login/login_confirm.jsp(10,0) The value for the useBean class attribute DB is invalid.
org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:40)
org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:407)
org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:148)
org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1200)
org.apache.jasper.compiler.Node$UseBean.accept(Node.java:1155)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2336)
org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2386)
org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2392)
org.apache.jasper.compiler.Node$Root.accept(Node.java:489)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2336)
org.apache.jasper.compiler.Generator.generate(Generator.java:3394)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:210)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:306)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:286)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:273)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:566)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:308)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
拜托，帮忙解决下赖！
Bean的程序：package DB;
import java.sql.*;
public class DB
{
String sDBDriver= "com.microsoft.jdbc.sqlserver.SQLServerDriver ";
String sConnStr= "jdbc.microsoft.sqlserver ";
public Connection conn=null;
public Statement stmt;
ResultSet rs=null;
String url= "jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=Mythesis ";
String user= "sa ";
String password= "123 ";
public DB(){
try{
Class.forName(sDBDriver).newInstance();
}
catch(Exception e){
e.printStackTrace();
}
}
public ResultSet executeQuery(String sql)
{
rs=null;
try{
conn=DriverManager.getConnection(url,user,password);
stmt=conn.createStatement();
rs=stmt.executeQuery(sql);
}
}
}
catch(SQLException ex)
{
System.out.print( "aq.executeQuery: "+e.getMessage());
}
return rs;
}
public void executeupdate(String sql)
{
stmt=null;
rs=null;
try{
conn=DriverManager.getConnection(url,user,password);
stmt=conn.createStatement();
stmt.executeQuery(sql);
stmt.close();
conn.close();
}
catch(SQLException ex)
{
System.out.print( "aq.executeQuery: "+e.getMessage());
}
}
public void closeStmt() {
try{
stmt.close();
}
catch(SQLException e){
e.printStackTrace();
}
}
public void closeConn() {
try{
conn.close();
}
catch(SQLException e){
e.printStackTrace();
}
}
}
调用的程序：
<%@ page contentType= "text/html;charset=gb2312 "%>
<%@ page import= "DB.DB "%>
<html>
<head>
<meta http-equiv= "Content-Type " content= "text/html ";charset=gb2312 ">
<title> 登录验证 </title>
</head>
<body>
<jsp:useBean id= "LoginBean " scope= "page " class= "DB ">
</jsp:useBean>
<%
String mesg= " ";
String name1=new String(request.getParameter( "user_name ").getBytes( "8859_1 "));
String pwd1=new String(request.getParameter( "password ").getBytes( "8859_1 "));
LoginBean.setUsername(name1);
Loginbean.setPassword(pwd1);
out.print(name1+pwd1);
if(LoginBean.execute()){
session.setAttribute( "username ",user_name);
session.setAttribute( "password ",pwd1);
%>
<script language=javascript>
window.location "index_ok.jsp?mark=成功登录 "
</script>
<%}
else{
String msg= "用户名或密码有误！ ";
%>
<jsp:forward page= "relogin.jsp "/>
<%}%>
</body>
</html>
[解决办法]
javabean必须加包名。
[解决办法]
<jsp:useBean id= "LoginBean " scope= "page " class= "DB.DB ">
[解决办法]
楼上是正解，没加BEAN的包名
[解决办法]
二楼是没错的,
lz先检查下classes目录下是否存在该编译好的文件
