/**
* Called to update the embedded Excel workbook. As the format and structire of the workbook are
* known in advance, all this code attempts to do is write a new value into the first cell on the
* first row of the first worksheet. Prior to executing this method, that cell will contain the
* value 1.
*
* @throws org.apache.poi.openxml4j.exceptions.OpenXML4JException Rather than use the specific
* classes (HSSF/XSSF) to handle the embedded workbook this method uses those defeined in the
* SS stream. As a result, it might be the case that a SpreadsheetML file is opened for
* processing, throwing this exception if that file is invalid.
* @throws java.io.IOException Thrown if a problem occurs in the underlying file system.
*/
public void updateEmbeddedDoc() throws OpenXML4JException, IOException {
Workbook workbook = null;
Sheet sheet = null;
Row row = null;
Cell cell = null;
PackagePart pPart = null;
Iterator<PackagePart> pIter = null;
List<PackagePart> embeddedDocs = this.doc.getAllEmbedds();
if (embeddedDocs != null && !embeddedDocs.isEmpty()) {
pIter = embeddedDocs.iterator();
while (pIter.hasNext()) {
pPart = pIter.next();
if (pPart.getPartName().getExtension().equals(BINARY_EXTENSION)
|| pPart.getPartName().getExtension().equals(OPENXML_EXTENSION)) {
// Get an InputStream from the pacage part and pass that
// to the create method of the WorkbookFactory class. Update
// the resulting Workbook and then stream that out again
// using an OutputStream obtained from the same PackagePart.
workbook = WorkbookFactory.create(pPart.getInputStream());
sheet = workbook.getSheetAt(SHEET_NUM);
row = sheet.getRow(ROW_NUM);
cell = row.getCell(CELL_NUM);
cell.setCellValue(NEW_VALUE);
workbook.write(pPart.getOutputStream());
}
}
// Finally, write the newly modified Word document out to file.
this.doc.write(new FileOutputStream(this.docFile));
}
}
/**
* Called to test whether or not the embedded workbook was correctly updated. This method simply
* recovers the first cell from the first row of the first workbook and tests the value it
* contains.
*
* <p>Note that execution will not continue up to the assertion as the embedded workbook is now
* corrupted and causes an IllegalArgumentException with the following message
*
* <p><em>java.lang.IllegalArgumentException: Your InputStream was neither an OLE2 stream, nor an
* OOXML stream</em>
*
* <p>to be thrown when the WorkbookFactory.createWorkbook(InputStream) method is executed.
*
* @throws org.apache.poi.openxml4j.exceptions.OpenXML4JException Rather than use the specific
* classes (HSSF/XSSF) to handle the embedded workbook this method uses those defeined in the
* SS stream. As a result, it might be the case that a SpreadsheetML file is opened for
* processing, throwing this exception if that file is invalid.
* @throws java.io.IOException Thrown if a problem occurs in the underlying file system.
*/
public void checkUpdatedDoc() throws OpenXML4JException, IOException {
Workbook workbook = null;
Sheet sheet = null;
Row row = null;
Cell cell = null;
PackagePart pPart = null;
Iterator<PackagePart> pIter = null;
List<PackagePart> embeddedDocs = this.doc.getAllEmbedds();
if (embeddedDocs != null && !embeddedDocs.isEmpty()) {
pIter = embeddedDocs.iterator();
while (pIter.hasNext()) {
pPart = pIter.next();
if (pPart.getPartName().getExtension().equals(BINARY_EXTENSION)
|| pPart.getPartName().getExtension().equals(OPENXML_EXTENSION)) {
workbook = WorkbookFactory.create(pPart.getInputStream());
sheet = workbook.getSheetAt(SHEET_NUM);
row = sheet.getRow(ROW_NUM);
cell = row.getCell(CELL_NUM);
assertEquals(cell.getNumericCellValue(), NEW_VALUE, 0.0001);
}
}
}
}