Здесь я использую OpenCsv API и Apache-POI.TO для чтения файла Excel и записи файла CSV.
public void ExcelTOCSV(){
CSVWriter writer=null;
int columnLength =0;
int i =0;String[] rowData;
HSSFCell cell = null;HSSFSheet sheet=null;
int SheetIndex=0;
try
{
InputStream resourceAsStream =ClassLoader.getSystemResourceAsStream(filePath);
HSSFWorkbook workbook = new HSSFWorkbook(resourceAsStream);
sheet = workbook.getSheetAt(sheetIndex);
//Here i am create my custom method to get column row on the basis of Sheet index.
columnLength = getNumberOfColumns(sheetIndex);
writer = new CSVWriter(new FileWriter("c:\\yourfile.csv"));
Iterator<Row> rows = sheet.rowIterator();
while (rows.hasNext())
{
rowData=new String[columnLength];
HSSFRow row = (HSSFRow) rows.next();
Iterator<Cell> cells = row.cellIterator();
i = 0;
while (cells.hasNext())
{
cell = (HSSFCell) cells.next();
//Must do this, you need to get value based on the cell type
switch (cell.getCellType())
{
case HSSFCell.CELL_TYPE_NUMERIC:
rowData[i]=Double.toString(cell.getNumericCellValue());
break;
case HSSFCell.CELL_TYPE_STRING:
rowData[i]=cell.getStringCellValue();
break;
case HSSFCell.CELL_TYPE_BLANK:
break;
default: break;
}//end of switch
i++;
}//cell while loop
writer.writeNext(rowData);//writing data into file
}//Row While loop
writer.close();
}
catch (IOException ex)
{
Logger.getLogger(CreateCSVFile.class.getName()).log(Level.SEVERE, null, ex);
}
}
Метод GetNumberofColumns:
public int getNumberOfColumns(int SheetIndex)
{
int NO_OF_Column=0;HSSFCell cell = null;
HSSFSheet sheet=null;
try {
loadFile(); //load give Excel
if(validateIndex(SheetIndex))
{
sheet = workbook.getSheetAt(SheetIndex);
Iterator rowIter = sheet.rowIterator();
HSSFRow firstRow = (HSSFRow) rowIter.next();
Iterator cellIter = firstRow.cellIterator();
while(cellIter.hasNext())
{
cell = (HSSFCell) cellIter.next();
NO_OF_Column++;
}
}
else
throw new InvalidSheetIndexException("Invalid sheet index.");
} catch (Exception ex) {
logger.error(ex);
}
return NO_OF_Column;
}