问题
I have the following block of code:
File file = new File("myFile.xlsx"); // my file
inputStream = new FileInputStream(file);
System.out.println("reading");
XSSFWorkbook wb = new XSSFWorkbook(inputStream);
XSSFSheet sh = wb.getSheetAt(0); // first sheet
Iterator rowIter = sh.rowIterator();
while(rowIter.hasNext()){ // iterate over all rows
System.out.println("New Row "); // notify of new row
Row myRow = (Row) rowIter.next();
Iterator cellIter = myRow.cellIterator();
while(cellIter.hasNext()){ // iterate over all cells in row
XSSFCell myCell = (XSSFCell) cellIter.next();
//how can I check that myCell has an image?
//(I'm expecting it to be in the fourth cell each time)
System.out.print(" " + myCell); // output cell content on same line
}
}
inputStream.close();
I am using Apache POI to read an .xlsx file. Each row can contain a cell with an image which was pasted into it by a user.
I'm hoping to grab the image and encode it to base64. How do I check if a cell contains an image while iterating through the spreadsheet?
I've already read http://poi.apache.org/spreadsheet/quick-guide.html#Images , but that deals with getting all images first, then iterating through them. I'd like to iterate through cells and check for images.
回答1:
The following code iterates through all images of the first sheet. So you don't need to iterate through rows/cols, but get the positions straight away. Apart of OneCellAnchor and TwoCellAnchor there are also AbsoluteAnchors which can't be directly associate with a cell.
import org.apache.poi.POIXMLDocumentPart;
import org.apache.poi.openxml4j.opc.*;
import org.apache.poi.xssf.usermodel.*;
import org.openxmlformats.schemas.drawingml.x2006.spreadsheetDrawing.*;
public class Images2Cells {
public static void main(String[] args) throws Exception {
OPCPackage opc = OPCPackage.open("auto.xlsx", PackageAccess.READ);
XSSFWorkbook book = new XSSFWorkbook(opc);
XSSFSheet sheet = book.getSheetAt(0);
for (POIXMLDocumentPart pdp : sheet.getRelations()) {
if (!XSSFRelation.DRAWINGS.getRelation().equals(pdp.getPackageRelationship().getRelationshipType())) continue;
PackagePart drawPP = pdp.getPackagePart();
WsDrDocument draw = WsDrDocument.Factory.parse(drawPP.getInputStream());
for (CTOneCellAnchor oneAnc : draw.getWsDr().getOneCellAnchorList()) {
String picId = oneAnc.getPic().getBlipFill().getBlip().getEmbed();
PackageRelationship pr = drawPP.getRelationship(picId);
PackagePart imgPP = drawPP.getRelatedPart(pr);
// byte imgBytes[] = IOUtils.toByteArray(imgPP.getInputStream());
System.out.println(imgPP.getPartName()
+" - Col: "+oneAnc.getFrom().getCol()
+" - Row: "+oneAnc.getFrom().getRow()
);
}
for (CTTwoCellAnchor twoAnc : draw.getWsDr().getTwoCellAnchorList()) {
String picId = twoAnc.getPic().getBlipFill().getBlip().getEmbed();
PackageRelationship pr = drawPP.getRelationship(picId);
PackagePart imgPP = drawPP.getRelatedPart(pr);
System.out.println(imgPP.getPartName()
+" - Col1: "+twoAnc.getFrom().getCol()
+" - Row1: "+twoAnc.getFrom().getRow()
+" - Col2: "+twoAnc.getTo().getCol()
+" - Row2: "+twoAnc.getTo().getRow()
);
}
}
opc.revert();
}
}
来源:https://stackoverflow.com/questions/19280057/how-do-i-check-if-a-cell-contains-an-image-using-apache-poi