Reading/Writing a Excel Sheet in Java
There are two good choices for reading & writing Microsoft Excel Spreadsheet files from Java, in a platform independent way, - jexcelapi and Jakarta POI (HSSF). Both of them provide nice interface to access Excel data structure and even generate new spreadsheet. I have done extensive tests with both of them for a high-profile project for a Fortune 500 company. Previously also I had successfully used HSSF for another high profile client. In the paragraphs below I present my conclusions and sample code for reading Excel spreadsheet from Java using both the libraries. Comparison of JExcelAPI with Jakarta-POI (HSSF)
1. JExcelAPI is clearly not suitable for important data. It fails to read several files. Even when it reads it fails on cells for unknown reasons. In short JExcelAPI isnt suitable for enterprise use.
2. HSSF is the POI Projects pure Java implementation of the Excel 97(-2002) file format. It is a mature product and was able to correctly and effortlessly read excel data generated from various sources, including non-MS Excel products like Open Office, and for various versions of Excel. It is very robust and well featured. Highly recommended.
3. Performance was never a consideration in our tests because a) data integrity is the single most important factor and b) there didnt appear to be any significant performance difference while running thetests; both of them were very fast. We didnt bother to time it for the above reasons.
How to read Excel Excel Spreadsheet from Java using Jakarta POI (HSSF)
try {
POIFSFileSystem fs = new POIFSFileSystem(new FileInputStream(file)); HSSFWorkbook wb = new HSSFWorkbook(fs);
HSSFSheet sheet = wb.getSheetAt(0);
HSSFRow row; HSSFCell cell;
int rows; // No of rows
rows = sheet.getPhysicalNumberOfRows();
int cols = 0; // No of columns
int tmp = 0;
// This trick ensures that we get the data properly even if it doesnt start from first few rows
for(int i = 0; i < 10 || i < rows; i++)
{
row = sheet.getRow(i);
if(row != null)
{ tmp = sheet.getRow(i).getPhysicalNumberOfCells();
if(tmp > cols) cols = tmp;
} }
for(int r = 0; r < rows; r++) {
row = sheet.getRow(r);
if(row != null) { for(int c = 0; c < cols; c++) {
cell = row.getCell((short)c);
if(cell != null)
{ // Your code here }
} } }
} catch(Exception ioe) { ioe.printStackTrace(); }
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