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Http Session tracking
hi,
could someone help me with a simple session tracking servlet...? i have a table in sql that holds user names and passwords, and i want to begin a new session for them when they login successfully.
i have seen many shopping cart examples but i do not know how to make a even simpler one just for logging in.
any sample codes would be very appreciated...thanks...
:)
could someone help me with a simple session tracking servlet...? i have a table in sql that holds user names and passwords, and i want to begin a new session for them when they login successfully.
i have seen many shopping cart examples but i do not know how to make a even simpler one just for logging in.
any sample codes would be very appreciated...thanks...
:)
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see this link,
you can find example program
http://www.apl.jhu.edu/~hall/java/Servlet-Tutorial/Servlet-Tutorial-Session-Tracking.html
you can find example program
http://www.apl.jhu.edu/~hall/java/Servlet-Tutorial/Servlet-Tutorial-Session-Tracking.html
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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.HttpSes
public class login extends HttpServlet{
  public void doPost(HttpServletRequest req, HttpServletResponse res)
  throws ServletException, IOException{
String user_name=req.getParameter
String pass=req.getParameter("ex_
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("userNam
    out.println(details);
    out.println("<HTML><BODY><
    out.println("<input type='submit'></form></bod
  } // 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.postgre
  Connection conn=DriverManager.getConn
  Statement smt = conn.createStatement();
 Â
  String query="select * from CUSTOMER"+
         " where USER_NAME = '"+user_name2+"' and CUST_PASS = '"+pass2+"'";
 Â
  ResultSet rs = smt.executeQuery(query);
  if (rs.next())
  {
    db_info = rs.getString("CUST_NAME1")
   }
  conn.close();
}
catch (Exception e)
  {
    System.err.println("Except
    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.HttpSes
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
   Â
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
...'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.HttpSes
public class login extends HttpServlet{
  public void doPost(HttpServletRequest req, HttpServletResponse res)
  throws ServletException, IOException{
String user_name=req.getParameter
String pass=req.getParameter("ex_
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("userNam
    out.println(details);
    out.println("<HTML><BODY><
    out.println("<input type='submit'></form></bod
  } // 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.postgre
  Connection conn=DriverManager.getConn
  Statement smt = conn.createStatement();
 Â
  String query="select * from CUSTOMER"+
         " where USER_NAME = '"+user_name2+"' and CUST_PASS = '"+pass2+"'";
 Â
  ResultSet rs = smt.executeQuery(query);
  if (rs.next())
  {
    db_info = rs.getString("CUST_NAME1")
   }
  conn.close();
}
catch (Exception e)
  {
    System.err.println("Except
    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.HttpSes
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
   Â
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
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If not you'll need to use URL rewriting to handle session tracking.
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Java
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Java is a platform-independent, object-oriented programming language and run-time environment, designed to have as few implementation dependencies as possible such that developers can write one set of code across all platforms using libraries. Most devices will not run Java natively, and require a run-time component to be installed in order to execute a Java program.