Solved: Http Session tracking

12/7/2004

Maybe helpful: https://www.experts-exchange.com/questions/21227832/Making-a-user-login-for-a-java-application.html

12/7/2004

see this link,
you can find example program
http://www.apl.jhu.edu/~hall/java/Servlet-Tutorial/Servlet-Tutorial-Session-Tracking.html

dr_alinaeem

12/8/2004

ASKER

thank you for your replies... :o)

...'objects'...i understand the part about beginnning a session and putting attributes into it, i maanged to do this in a servlet....however, i am having problems with using the same session across two servlets....

this is the coding for the first servlet 'login'...

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
import javax.servlet.http.HttpSession.*;

public class login extends HttpServlet{
public void doPost(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException{

String user_name=req.getParameter("ex_user_name");
String pass=req.getParameter("ex_pass");

PrintWriter out = res.getWriter();

String details = null;

try
{
details = function1(user_name,pass);
}
catch (SQLException e) {}

if (details == null)
{
out.println("Your user name or password is incorrect");
}
else
{
HttpSession sess = req.getSession(true);
sess.setAttribute("userName", details);
out.println(details);
out.println("<HTML><BODY><FORM ACTION='/servlet/read' METHOD='POST'>");
out.println("<input type='submit'></form></body></html>");*/

} // end of details condition

} // end of doPost

public String function1(String user_name2,String pass2) throws SQLException
{

String db_info = null;
String url="jdbc:postgresql://********";
String dbuser="***";
String dbpass="*****";

try{
Class.forName("org.postgresql.Driver");
Connection conn=DriverManager.getConnection(url,dbuser,dbpass);

Statement smt = conn.createStatement();

String query="select * from CUSTOMER"+
" where USER_NAME = '"+user_name2+"' and CUST_PASS = '"+pass2+"'";

ResultSet rs = smt.executeQuery(query);

if (rs.next())
{
db_info = rs.getString("CUST_NAME1");
}

conn.close();
}
catch (Exception e)
{
System.err.println("Exception: " + e + "\n" + e.getMessage());
e.printStackTrace();
}
return db_info;

}

}

on this servlet, the user name prints out fine.....then in another servlet, called 'read'...this is the coding...

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.http.HttpSession.*;

public class read extends HttpServlet{
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException{

PrintWriter out = response.getWriter();

HttpSession sess = request.getSession();

String foo = (String) sess.getAttribute(userName);

out.println(foo);

}

}

but the 'read' servlet just prints out 'null' not the user name.....please help...i have also tried using getValue() instead of getAttribute but no luck... :o(

dr_alinaeem

Mick Barry

12/8/2004

Do you have cookies enabled in your browser?
If not you'll need to use URL rewriting to handle session tracking.