Problem to read and write files on hdd out of html with an Applet ????

Question

hi there,
i wrote an applet for loading a file from HDD or saving data out of a cookie in a file on a hdd.
when i compile the class there are warnings about "unchecked method invocation" and "unchecked conversion".
what did i do wrong?
i think it's about this function:
AccessController.doPrivileged(new PrivilegedAction()
public Object run()
if(saveCartAtOnce.toLowerCase().compareTo("true")== 0)
SaveShoppingCart();
}//if
return null;
}// public Object run
});//AccessController
could anyone help me?
i could also send the whole class then....
thanks a lot.
greetings
Volker Becht
[email protected]

Answer 1

OK
now i will post the whole class.
my questen is: what have i to do so that anything runs?
if anyone will need a file example which should be read
into the calss i will email it.
package de.CATALOGcreator.shoppingcart;
import java.awt.*;
import java.io.*;
import java.applet.*;
import java.util.*;
import java.security.*;
import netscape.javascript.*;
public class shoppingcart extends java.applet.Applet
     private static final long serialVersionUID = 1234567890L;
   //Explanation of the possible Parameters of the applet, all of the following
    //parameters need not be given explicitely, because they have default values.
    String errorMessageInvalidFileFormat = "";  //set the ErrorMessage String for InvalidFileFormat when loading
    String openDialogTitle = "";                //set the Open Dialog Title
    String saveDialogTitle = "";                //set the Save Dialog Title
    String articleNumberString = "";            //set the ArticleNumber of the CSV headline
    String articleNameString = "";              //set the ArticleName of the CSV headline
    String amountString = "";                   //set the AmountName of the CSV headline
    String priceString = "";                    //set the PriceName of the CSV headline
    String delimiterString ="";                 //set the Delimiter for the Output-csv
    String inputdelimiterString ="";            //set the Delimiter for the Intput-csv
    //No parameter, this String is built from articleNumberString, articleNameString, amountString and
    //priceString and delimiterString in the following manner:
    //headline = articleNumberString + delimiterString + articleNameString + delimiterString + amountString+ delimiterString  + priceString;
    //see: init();
    String headline = "";                       //set the Headline of the csv-file
    //Another parameter is saveCartAtOnce, which says, if the save-Dialog is schown
    //at once when the applet is initialized. If the value is "true", the dialog shows
    //at once, in all other cases (also if parameter does not exist) you have to
    //call SaveShoppingCart explicitely.
    String saveCartAtOnce;
   public void init()
        try
               //set the default setting for the Paramters
               openDialogTitle = this.getParam("openDialogTitle", "Open Shopping Cart");
               saveDialogTitle = this.getParam("saveDialogTitle", "Save File As");
               errorMessageInvalidFileFormat = this.getParam("errorMessageInvalidFileFormat", "Invalid File Format!\nLoading stopped.");
               delimiterString = this.getParam("delimiterString", "||");
               inputdelimiterString= this.getParam("inputdelimiterString", ",");
               articleNumberString = this.getParam("articleNumberString", "Article Number");
               articleNameString = this.getParam("articleNameString", "Article");
               amountString = this.getParam("amountString", "Amount");
               priceString = this.getParam("priceString", "Price");
               headline = articleNumberString + delimiterString + articleNameString + delimiterString + amountString + delimiterString  + priceString;
               saveCartAtOnce = this.getParameter("saveCartAtOnce");
               AccessController.doPrivileged(new PrivilegedAction()
                              public Object run()
                                   if(saveCartAtOnce.toLowerCase().compareTo("true")== 0)
                                        SaveShoppingCart();
                                        //LoadShoppingCart();
                                   }//if
                                   return null;
                              }// public Object run
               });//AccessController
          catch(Exception e)
               e.printStackTrace();
    }//void init
    public void  SaveShoppingCart()
        DataOutputStream dos;
        String myFile;
        File f ;
         myFile =  SaveDialog();
           if(myFile!=null)
                f = new File(myFile);
               String Artikel=getParameter("Artikel");
               String Anzahl=getParameter("MyAnzahl");
               String Bezeichnung=getParameter("Bezeichnung");
               String Preis=getParameter("Preis");
               StringTokenizer stArticle = new StringTokenizer(Artikel, inputdelimiterString);
               StringTokenizer stAnzahl = new StringTokenizer(Anzahl, inputdelimiterString);
               StringTokenizer stBezeichnung = new StringTokenizer(Bezeichnung, inputdelimiterString);
               StringTokenizer stPreis = new StringTokenizer(Preis, inputdelimiterString);
               JSObject.getWindow(this).eval("alert('"+ Artikel +"')");
                 try
                      dos = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(myFile),128));
                      // Line 1
                    dos.writeChars(headline + "\n");
                      while (stArticle.hasMoreTokens())
                          String tmpArticle=stArticle.nextToken();
                          String tmpAnzahl=stAnzahl.nextToken();
                          String tmpBezeichnung=stBezeichnung.nextToken();
                          String tmpPreis=stPreis.nextToken();
                          dos.writeChars(tmpArticle + delimiterString + tmpBezeichnung + delimiterString +tmpPreis +  delimiterString + tmpAnzahl + "\n");
                    }//while
                      dos.flush();
                      System.out.println("Successfully wrote to the file named " + myFile + " -- go take a look at it!");
                      dos.close();
               }//try
                  catch (SecurityException e)
                    System.out.println("JavaSoft SaveShoppingCart: SecurityException\nMessage:" + e.getMessage() + "\nStackTrace:");
                    e.printStackTrace(System.out);
               }//catch
               catch (IOException ioe)
                    System.out.println("JavaSoft SaveShoppingCart: IOexception\nMessage:" + ioe.getMessage() + "\nStackTrace:");
                    ioe.printStackTrace(System.out);
               }//catch
          }//if
    }//void  SaveShoppingCart
    private String SaveDialog()
        try
           //Date now = new Date(System.currentTimeMillis());
            Calendar rightNow = Calendar.getInstance();
           //SystemDate
            //String strDay = Integer.toString(now.getDate());
            String strDay = Integer.toString(rightNow.get(Calendar.DAY_OF_MONTH));
            //String strMonth = Integer.toString(now.getMonth()+1);
            String strMonth = Integer.toString(rightNow.get(Calendar.MONTH));
            //String strYear = Integer.toString(now.getYear()+1900);
            String strYear = Integer.toString(rightNow.get(Calendar.YEAR));
            //SystemTime
            //String strHoure = Integer.toString(now.getHours());
            String strHoure = Integer.toString(rightNow.get(Calendar.HOUR));
            //String strMinutes = Integer.toString(now.getMinutes());
            String strMinutes = Integer.toString(rightNow.get(Calendar.MINUTE));
            //String strSeconds = Integer.toString(now.getSeconds());
            String strSeconds = Integer.toString(rightNow.get(Calendar.SECOND));
            //set SystemDate+SystemTime
            String strDate=strDay+"_"+strMonth+"_"+strYear+"_"+strHoure+"_"+strMinutes+"_"+strSeconds;
            //set SaveName as *.csv
            String SaveAs = strDate + ".csv";
            FileDialog fd = new FileDialog (new Frame(), "Save File As", FileDialog.SAVE);
            fd.setFile(SaveAs);
            fd.setVisible(true);
            //Value Save or Cancel Button
            if((fd.getDirectory() == null) || (fd.getFile() == null)) // user pressed the cancel - button
                return null;
            }//if
            else // user pressed save - button
                return fd.getDirectory() + fd.getFile();
            }//else
        }//try
        catch (SecurityException e)
               System.out.println("JavaSoft String SaveDialog: SecurityException\nMessage:" + e.getMessage() + "\nStackTrace:");
               e.printStackTrace(System.out);
              return null;
        }//catch
    }// String SaveDialog
    public String OpenDialog()
           FileDialog fd = new FileDialog (new Frame(), openDialogTitle, FileDialog.LOAD);
           fd.setVisible(true);
           return fd.getDirectory() + fd.getFile();
    }//String OpenDialog
    private String getParam( String paramName, String defaultValue )
          String value = getParameter( paramName );
          if ( value != null )
               return value;
          }//if
          return defaultValue;
    }//String getParam
    public void LoadShoppingCart()
        String myFile;
        File f ;
        myFile =  OpenDialog();
        if(myFile!=null)
               f = new File(myFile);
               String rl = "";
               Object[] Obj = new Object[2];
               try
                    DataInputStream dis = new DataInputStream(new BufferedInputStream(new FileInputStream(myFile),128));
                    // Line 1
                    String FirstLine = myReadLine(dis);
                    JSObject.getWindow(this).eval("alert('"+ FirstLine +"')");
                    if(FirstLine.startsWith(headline))
                         while ( (rl = myReadLine(dis)) != null)
                              //examines correct delimiter
                              StringTokenizer token = new StringTokenizer (rl, delimiterString);
                              if(token.countTokens()!= 4)
                                   dis.close();
                                   JSObject.getWindow(this).eval("alert('"+ errorMessageInvalidFileFormat +"')");
                              }//if
                            Obj[0]= (Object)rl;
                            Obj[1]= (Object)delimiterString;
                            JSObject.getWindow(this).call("addCSVArticle",Obj); // this=applet
                         }//while
                         JSObject.getWindow(this).call("importFinished",null);
                    else
                         dis.close();
                         JSObject.getWindow(this).eval("alert('"+ errorMessageInvalidFileFormat +"')");
                         //System.exit(-1);
                    }//else
                    dis.close();
               }//try
                  catch (SecurityException e)
                    System.out.println("JavaSoft LoadShoppingCart: SecurityException\nMessage:" + e.getMessage() + "\nStackTrace:");
                    e.printStackTrace(System.out);
               }//catch
               catch (IOException ioe)
                    System.out.println("JavaSoft LoadShoppingCart: IOexception\nMessage:" + ioe.getMessage() + "\nStackTrace:");
                    ioe.printStackTrace(System.out);
               }//catch
               catch(Exception exc)
                    System.out.println("JavaSoft LoadShoppingCart: Exception\nMessage:" + exc.getMessage() + "\nStackTrace:");
                    exc.printStackTrace(System.out);
               }//catch
          }//if
    }//void LoadShoppingCart
    private String myReadLine(DataInputStream dis)
        char tmp;
        String line = "";
        try
            while((tmp = dis.readChar())!= '\n')
                line += tmp;
            return line;
        }//try
        catch(IOException ioexc)
            return null;
        }//catch
    }//String myReadLine
    public boolean isInitialized()
          return true;
}//public class ShoppingCart extends java.applet.Applet[/i]