Help please!!!! regarding the calling of a class by a servlet

Question

Hi all,
I have written a separate class (UserPresent.java),in this class I am doing checking for useid and password provided by a html form.I will post the code now.
import java.sql.*;
import java.lang.*;
import java.io.*;
public class UserPresent {
try
    Connection con = DriverManager.getConnection("jdbc:odbc:MyDS");
    System.out.println("Successfully connected to database");
}catch (Exception e){
     e.printStackTrace();
  // Should write a method here
  public testUserExist(){
  try{
       PreparedStatement pstmt;
       pstmt = con.prepareStatement("SELECT username,password FROM users" + " WHERE username ='" + user + "'" +  "AND password='" + pass + "'");
       ResultSet rs = pstmt.executeQuery();
       if(rs.next())
                          username = rs.getString(1);
          password = rs.getString(2);     
       if (username != null && password != null && user.equals(username) && pass.equals(password) ){
         message ="ok";
         PrintWriter out = response.getWriter();
         out.print("<B>" + message + "</B>");
    //response.sendRedirect ("http://localhost:8080/thankyou.html");
       }//closes the if statement
       else {
           message="not ok";
           PrintWriter out = response.getWriter();
           out.print("<B>" + message + "</B>");
    //response.sendRedirect ("http://localhost:8080/sampleapp/login.html");
       }//close else statement
    }catch (Exception e){
       e.printStackTrace()
  } // End of testUserExist()
// Whole thing should be a method ???? What will it return ??????? What will the parameters be ???????
} // End of class UserPresentI wanted to know how this above code can be incorporated into a servlet code
1) The parameters with which this method should be called from the servlets' doPost() method
2) What will be the return type of this method
Hope that my question is well stated.Help would be greatly appreciated
Thanks in advance
AS

Answer 1

Hi all,
I have written a separate class
class (UserPresent.java),in this class I am doing
checking for useid and password provided by a html
form.I will post the code now.
import java.sql.*;
import java.lang.*;
import java.io.*;
public class UserPresent {
try
Connection con =
n = DriverManager.getConnection("jdbc:odbc:MyDS");
System.out.println("Successfully connected to
to database");
}catch (Exception e){
     e.printStackTrace();
// Should write a method here
public testUserExist(){
try{
PreparedStatement pstmt;
pstmt = con.prepareStatement("SELECT
SELECT username,password FROM users" + " WHERE
username ='" + user + "'" +  "AND password='" + pass +
ResultSet rs = pstmt.executeQuery();
if(rs.next())
username = rs.getString(1);
          password = rs.getString(2);     
if (username != null && password != null &&
ull && user.equals(username) && pass.equals(password)
message ="ok";
PrintWriter out = response.getWriter();
out.print("<B>" + message + "</B>");
//response.sendRedirect
ect ("http://localhost:8080/thankyou.html");
}//closes the if statement
else {
           message="not ok";
           PrintWriter out = response.getWriter();
           out.print("<B>" + message + "</B>");
//response.sendRedirect
ect ("http://localhost:8080/sampleapp/login.html");
}//close else statement
}catch (Exception e){
       e.printStackTrace()
} // End of testUserExist()
// Whole thing should be a method ???? What will it
return ??????? What will the parameters be ???????
} // End of class UserPresentI wanted to know how this above code can be
n be incorporated into a servlet code
1) The parameters with which this method should
hould be called from the servlets' doPost() method
2) What will be the return type of this method
Hope that my question is well
estion is well stated.Help would be greatly
appreciated
Thanks in advance
AS
thanks people,Well I wasnt thinking when I posted the code for UserPresent.java
I didnt mean to include the presentation logic i.e., message="ok" and things like that in this jave file,do excuse me for this.
I will think about it and get back to you people hopefully ASAP
Thanks again
AS