FastExcel is a pure java excel read/write component.It's FAST and TINY. We provide:
FastExcel 0.5.1 Release
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New Features in FastExcel 0.4
FastExcel is a pure java excel read/write component.We provide reading and writing Excel[1]'97(-2003)
(BIFF8[2]) file format and a low level API for compound document file format[3][4].It license under the
term of LGPL.
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A workbook document with several sheets (BIFF5-BIFF8) is usually stored using the compound document file format (also known as "OLE2 storage file format" or "Microsoft Office compatible storage file format"). It contains several streams for different types of data.Depending on the document type, different names are used for the stream(s) they contain. BIFF5-BIFF8 workbook documents that are stored in a compound document file contain a stream in the root storage called the Workbook Stream. The name of this stream in the compound document file is "Book" for BIFF5 workbooks, and "Workbook" for BIFF8 workbooks.If a BIFF5-BIFF8 workbook document is stored as stream file, the entire stream is called the Workbook Stream. In BIFF5-BIFF8 Workbook Streams, the Workbook Globals Substream is not the leading part of the stream. It is followed by all Sheet Substreams in order of the sheets that are in the document. Common structure of a BIFF5-BIFF8 Workbook Stream:
Most of the Excel streams or substreams are divided into records. Each record contains specific data for the various contents or features in a document. It consists of a header specifying the record type and size, followed by the record data. Common structure of a BIFF record:
| Offset | Size | Contents |
| 0 | 2 | Identifier |
| 2 | 2 | Size of the following data (sz) |
| 4 | sz | Record data |
To read excel file.FastExcel parses these records and build an inner struct of excel file.The Record Parsers:
Basic Read
public void testDump() throws ExcelException {
Workbook workBook;
workBook = FastExcel.createReadableWorkbook(new File("test.xls"));
workBook.setSSTType(BIFFSetting.SST_TYPE_DEFAULT);//memory storage
workBook.open();
Sheet s;
s = workBook.getSheet(0);
System.out.println("SHEET:"+s);
for (int i = s.getFirstRow(); i < s.getLastRow(); i++) {
System.out.print(i+"#");
for (int j = s.getFirstColumn(); j < s.getLastColumn(); j++) {
System.out.print(","+s.getCell(i, j));
}
System.out.println();
}
workBook.close();
}
Event-based Read
public void testEventDump() throws ExcelException {
Workbook workBook;
workBook = FastExcel
.createReadableWorkbook(new File("test.xls"));
workBook.open();
workBook.getSheet(0, new SheetReadAdapter() {
public void onCell(int row, int col, String content) {
System.out.println(row + "," + col + "," + content);
}
});
workBook.close();
}
Basic Write
public void testWrite() throws ExcelException{
File f=new File("write.xls");
Workbook wb=FastExcel.createWriteableWorkbook(f);
wb.open();
Sheet sheet=wb.addSheet("sheetA");
sheet.setCell(1, 2, "some string");
wb.close();
}
Stream Write
public void testStreamWrite() throws Exception{
File f=new File("write1.xls");
Workbook wb=FastExcel.createWriteableWorkbook(f);
wb.open();
Sheet sheet=wb.addStreamSheet("SheetA");
sheet.addRow(new String[]{"aaa","bbb"});
wb.close();
}