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authentication problem

 
vinaykumar singh
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Posts: 13
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hello all

i m trying to make a simple authentication program.in which i take username and password from one jasp and maching in another jsp. code is here

%@ page language="java" %>
<%@ page import="java.util.*" %>

<%

Static check = no;
String username = request.getParameter("username");
String password = request.getParameter("password");



public void authenticate( String username,String password) {

String query="select * from Registration;";
String DbUserName="";
String DbPassword="";
String finalUser="";
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection con=DriverManager.getConnection("jdbc dbc:Registration");
Statement stat=con.createStatement();
ResultSet rst=stat.executeQuery(query);
while(rst.next())

{
DbUserName=rst.getString("UserName");
DbPassword=rst.getString("password");

if (username.equals(DbUserName) && password.equals(DbPassword)) {

check = yes;
break;
}

}

}catch(Exception e){

e.printStackTrace();

}
if (check==yes) {
%>
<jsp:forward page="success.jsp"/>
<%
} else {
%>
<jsp:forward page="retry.jsp"/>
<%
}

}
%>
__________________________

when i m compile this its giving error like this:

An error occurred at line: 5 in the jsp file: /jsp/process2.jsp
Generated servlet error:
Syntax error on token "(", ; expected

An error occurred at line: 5 in the jsp file: /jsp/process2.jsp
Generated servlet error:
Syntax error on token ",", ; expected

An error occurred at line: 5 in the jsp file: /jsp/process2.jsp
Generated servlet error:
Syntax error on token ")", ; expected



plz help me or give me another piece of code .....

thanks in advance

vinay
 
Vasudevan Badri
Greenhorn
Posts: 6
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Hey Vinay.

Could you tell if the JSP that you have given here, is it named as process2.jsp. Or is it the forward page.
 
vinaykumar singh
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Posts: 13
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hello Vasudevan Badri

it is process2.jsp and if the user is authenticated then success.jsp is forwarded otherwise retry.jsp.
 
Manesh Kumar
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Vinay,

You cant write Java functions (methods) within the the <% %>. The code in in JSP will be generated inside the _jspService method. So that is the reason you get the compilation errors.

To put java function inside generated JSP class file you need to put in the <%! %> . This will make the code to be generated inside the JSP class file. Beware JSP instances are singleton, so if you declare any variable inside the <%! %> (class scope), it will be shared across all the requests from all the users.

You can use the session object to store the values pertaining to a particular user.

Hope this helps.
 
Adeel Ansari
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Caution: Do care of thread safety. Otherwise, it can show you hell.
 
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