java - Don't create a new CSV file each time -

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so trying make work each time use method (which found on internet) creates new csv file, want add data each time, without removing there.

            public static void generatecsvfile(string sfilename) {             try {                 nummers = nummer.gettext();                 locatiess = locatie.gettext();                 logins = login.gettext();                 nummer5s = nummer5.gettext();                 nummer1s = nummer1.gettext();                 datums = datum.gettext();                   filewriter writer = new filewriter(sfilename);                 writer.append(nummers);                 writer.append(';');                 writer.append(locatiess);                 writer.append(';');                 writer.append(logins);                 writer.append(';');                 writer.append(datums);                 writer.append(';');                 writer.append(nummer1s);                 writer.append(';');                 writer.append(nummer5s);                 writer.append(';');                 if(listt.getselectedvalue() != null)                 {                 writer.append(listt.getselectedvalue().tostring());                 }                 workbook workbook = null;                 try {                     workbook = workbook.getworkbook(new file("f:\\test.xls"));                 } catch (biffexception e1) {                      e1.printstacktrace();                 } catch (ioexception e1) {                      e1.printstacktrace();                 }                  writer.append(';');                 sheet sheet = workbook.getsheet(0);                 for(cell c : sheet.getcolumn(1)){                     if(listt.getselectedvalue() != null)                     {                       if(c.getcontents().contains(listt.getselectedvalue().tostring())){                           system.out.println(c.getcolumn() + " , " + c.getrow());                          writer.append(sheet.getcell(c.getcolumn()+1,c.getrow()).getcontents());                       } else {                        }                 }                 }                 // generate whatever data want                 writer.append("\n");                 writer.flush();                 writer.close();             } catch (ioexception e) {                 e.printstacktrace();             }         }

and call method.

if(e.getsource().equals(save)){     generatecsvfile("f:\\testss.csv");     joptionpane.showmessagedialog(null, "saved!"); }

you calling wrong constructor while creating filewriter. rewrite to:

new filewriter(sfilename, true);

that should preserve data. here direct link documentation.


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