please critique

I have very little java skills , if even that much :-)

But I needed a program, that I could run via a runrmtcmd from the as/400, to
a PC,  but then I wanted the PC based java program, to update a table on the
as/400, regarding certain status, about a file...

This program needs to be ran, a lot, on the PC...  So I was wondering if I
could get a few comments and suggestions to let me know, if I wrote this
program in the most stable way...  Memory leaks, jdbc
opening/closing/registering, that would only surface after many days of use,
or maybe there is a better way to execute jdbc operations..  I pulled the
current code from various places on the web, and I have no idea if I did it
right...  It works, but I don't know for how long :-)
Please let me know...

Thank you,  tim

/**

commandline example:
   -oC:\edi\OfficeDepot\out\OFFICE_DEPOT_850_64.edi 
   -s172.16.1.19 
   -p037837.RA.EDI 
   -cc:\edi\officedepot\out\ 
   -tedilib.edifile 
   -fFTP_OUTBOX_BEFORE_SEND

 * @author Tim-H
 *
 * To change this generated comment edit the template variable
"typecomment":
 * Window>Preferences>Java>Templates.
 * To enable and disable the creation of type comments go to
 * Window>Preferences>Java>Code Generation.
 */

import java.io.*;
import java.sql.*;

public class edifilecheck
{

// Parmaters
//     1.  as400system = xxx.xx.x.xx
//     2.  poid number in the bootstrap that were looking for.  
//     3.  original edi mapped file, with path, so we can remove the path,
and
//             append the path we need to verify.
//     4.  Path to check for a file.
//     5.  Field to update in the bootstrap table.
//
//



        public static void main(String[] args)
        {



        String FILEFOUND = "?";

                String system             = null;
                String ponumber           = null;
                String originalmappedfile = null;
                String checkpath          = null;
                String table              = null;
                String updatefield        = null;

                int k = 0;
                while ( args.length > k )
                {
                        if ( args[k].startsWith("-s") )
                                system = args[k].substring(2);
                        if ( args[k].startsWith("-p") )
                                ponumber= args[k].substring(2);
                        if ( args[k].startsWith("-o") )
                                originalmappedfile = args[k].substring(2);
                        if ( args[k].startsWith("-c") )
                                checkpath = args[k].substring(2);
                        if ( args[k].startsWith("-f") )
                                updatefield = args[k].substring(2);
                        if ( args[k].startsWith("-t") )
                                table = args[k].substring(2);

                        k++;
                }

                System.out.println("System IP : "+system);
                System.out.println("PO NUMBER : "+ponumber);
                System.out.println("TABLE     : "+table);
                System.out.println("TAB-FIELD : "+updatefield);
                System.out.println("ORIGINAL  : "+originalmappedfile);
                System.out.println("CHECK PATH: "+checkpath);

if (k != 6) {
        System.out.println("NOT ENOUGH PARAMETERS");
        System.exit(0);
           
}



                File originalfile = new File(originalmappedfile);

                System.out.println("FILENAME  : "+originalfile.getName());



//              System.out.println(originalfile.getName());
//              System.out.println(originalfile.getPath());
//              System.out.println(originalfile.getParent());
//              System.out.println(File.separatorChar);
//              if(originalfile.exists())
//              System.out.println("OR-FOUND");
//                 else
//              System.out.println("OR-NOTFOUND");
                
                // We need to seperate the filename portion of the original
mapped
                // file, to extract the name, so we can append the path we
really want
                // to verify the file...
                
                String verifyfile = checkpath + originalfile.getName();
                System.out.println("VERIFYFILE: "+verifyfile);
                File ftVerifyfile = new File(verifyfile);
                
                if(ftVerifyfile.exists()) {
                System.out.println("FOUND     : "+ftVerifyfile.getPath());
                        FILEFOUND = "Y";
                }
                   else {
                    System.out.println("NOTFOUND  :
"+ftVerifyfile.getPath());
                        FILEFOUND = "N";
                   }            
                Connection con = null;
                
                try {
                        DriverManager.registerDriver(new
com.ibm.as400.access.AS400JDBCDriver());
                        con = DriverManager.getConnection
("jdbc:as400://"+system,"username","password");

                        // Run an SQL SELECT statement
                        Statement stmt = con.createStatement ();

          String sqltext = "SELECT * FROM "+table+ " where poid =
'"+ponumber+"'";

                        System.out.println("SQLTEXT   : " +sqltext);
                        ResultSet rs = stmt.executeQuery (sqltext);

                        // Show what happened before the update

                        // Display each row (record) retrieved by the SQL
statement
                        while (rs.next ()) {
                                System.out.println("BEFORE");
                                System.out.println("UPDATEFLD :
"+rs.getString(updatefield));
                                System.out.println("POID      :
"+rs.getString("POID"));
                                }
                        rs.close ();

                        
                        // update the field, if it needs to be...

            String sqlupdate =
               "UPDATE "+table+" SET "+updatefield+" = '"+FILEFOUND+ 
                 "' WHERE POID = '"+ponumber+"'";
                        System.out.println("SQLUPDTEXT: "+sqlupdate);
                        System.out.println("UPDATE    : "+stmt.executeUpdate
(sqlupdate));
                        
                        // Show what happened after the update
                        
                        rs = stmt.executeQuery (sqltext);

                        // Display each row (record) retrieved by the SQL
statement
                        while (rs.next ()) {
                                System.out.println("AFTER");
                                System.out.println("UPDATEFLD :
"+rs.getString(updatefield));
                                System.out.println("POID      :
"+rs.getString("POID"));
                                }
                        rs.close ();
                        
                        
                        
                        
                        stmt.close ();
                  }

                 catch (Exception e) {
                  System.out.println ("DATABASE UPDATE ERROR: " +
e.getMessage());
                  }

                 finally {
                   try {
                         con.close ();
                   }
                 catch (SQLException e) {
                 }
                 }
        }
}



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