excel - xlsx file corrupted while writing file in java -


i write code writing xlsx file 

try {                   fileinputstream fis = new fileinputstream(filepath);                   workbook workbook = new xssfworkbook(fis);                     workbook workbook_ = new xssfworkbook();                   string value = cmbsheets.getselecteditem().tostring();                   sheet sheet = workbook.getsheet(value);                   sheet sheet1 = workbook_.createsheet("sheet1");                   int q = 1;                   row headrow = sheet1.createrow((short) 0);                iterator<row> rowiterator = sheet.iterator();              while (rowiterator.hasnext()) {                 row = rowiterator.next();                 iterator<cell> celliterator = row.celliterator();                  while (celliterator.hasnext()) {                     cell = celliterator.next();                      switch (cell.getcelltype()) {                          case cell.cell_type_boolean:                             system.out.println(cell.getbooleancellvalue());                             break;                          case cell.cell_type_numeric:                             system.out.println(cell.getnumericcellvalue());                             break;                          case cell.cell_type_string:                             //system.out.println(cell.getstringcellvalue());                             string cellvalue = cell.getstringcellvalue();                             string[] spllitedvalues = cellvalue.split(" ");                              headrow.createcell(0).setcellvalue("no.");                             headrow.createcell(1).setcellvalue("name");                             headrow.createcell(2).setcellvalue("address");                             headrow.createcell(3).setcellvalue("synonyms");                             headrow.createcell(4).setcellvalue("pin");                             headrow.createcell(5).setcellvalue("contact");                             headrow.createcell(6).setcellvalue("age");                              //for (int r = 0; r <= spllitedvalues.length; r++) {                              //  set seta = new hashset();                             (string token : spllitedvalues) {                                   seta.add(token);                             }                              break;                           case cell.cell_type_blank:                             system.out.println(" ");                             break;                          default:                             system.out.println(cell);                     }//end of switch case                     (object object : seta) {                         string element = (string) object;                         if (element.matches("([a-za-z0-9]+)|([a-za-z0-9]+[-][a-za-z0-9]+)+")) {                              row row_ = sheet1.createrow((short) q);                             row_.createcell(1).setcellvalue(element);                              q++;                         }//end of if                      }                      fileout = new fileoutputstream(system.getproperty("user.home") + "\\" + "desktop\\" + finaltargetfile + ".xlsx");                     workbook_.write(fileout);                     fileout.flush();                     fileout.close();

but when opening xlsx file iam getting error message
excel found unreadable content in 'filename.xlsx'. want recover contents of workbook? if trust source of workbook, click yes.
wrong in code?


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