excel import and export --poi

1.jar package
website http://www.apache.org/dyn/closer.cgi/poi/ right click on the hyperlink 2.5.1.zip to download the compressed package poi-bin-2.5.1-final-20040804.zip,
2 .Use the Excel object corresponding to the poi
POI object name
a.HSSFWorkbook workbook
b.HSSFSheet worksheet
c.HSSFRow row
d.HSSFCell cell

create workbook HSSFWorkbook
wb = new HSSFWorkbook(filename);
create worksheet
HSSFSheet sheet = wb.getSheetAt (0);
row
int firstRowNum = sheet.getFirstRowNum();
int lastRowNum = sheet.getLastRowNum();
column
HSSFRow dataRow = sheet.getRow(rowNum);
int firstCellNum = dataRow.getFirstCellNum();
int lastCellNum = dataRow.getLastCellNum( );
get the value of the cell
dataRow.getCell(i)