在不使用文件輸入流的情況下使用poi在excel中添加數據url數據url

Question

如何使用Apache-poi在Excel中添加帶有數據url的圖像。

轉換解決方案呈現在瀏覽器中的字節數組

Answer 1

public void generateSpreadsheet() { 

    Workbook wb = new XSSFWorkbook(); 
    XSSFSheet sheet1 = null; 
    HttpSession session = ServletUtil.getInstance().getSession(); 
    String pngImageURL = "data:image/png;base64,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...";//data-uri 

    sheet1 = (XSSFSheet) wb.createSheet("ExcelName"); 

    //Method1 for data-uri using org.apache.commons.codec.binary.Base64 library 
    String encodingPrefix = "base64,"; 
    int contentStartIndex = pngImageURL.indexOf(encodingPrefix) + encodingPrefix.length(); 
    byte[] imageData1 = org.apache.commons.codec.binary.Base64.decodeBase64(pngImageURL.substring(contentStartIndex));//workbook.addPicture can use this byte array 

    //Alternate Method2 for data-uri using javax.xml.bind 
    // Read from a Data URL 
    byte[] imagedata2 = DatatypeConverter.parseBase64Binary(pngImageURL.substring(contentStartIndex)); //workbook.addPicture can use this byte array 

    //Alternate Method3 for Image File using FileInputStream 
    try { 
     InputStream is = new FileInputStream("C://Users//Desktop//downloadpngImage.png"); 
     byte[] bytes = IOUtils.toByteArray(is);//workbook.addPicture can use this byte array 
     } catch (FileNotFoundException e) {} 
     catch (IOException e) {} 

    //code for adding image to excel starts 
    int pictureIdx = wb.addPicture(imageData1, wb.PICTURE_TYPE_PNG); 

    // Create the drawing patriarch. This is the top level container for all shapes. 
    Drawing drawing = sheet1.createDrawingPatriarch(); 

    //add a picture shape 
    CreationHelper helper = wb.getCreationHelper(); 
    ClientAnchor anchor = helper.createClientAnchor(); 
    //set top-left corner of the picture, 
    //subsequent call of Picture#resize() will operate relative to it 
    anchor.setCol1(2); 
    anchor.setCol2(3); 
    anchor.setRow1(3); 
    anchor.setRow2(4); 

    Picture pict = drawing.createPicture(anchor, pictureIdx); 

    //auto-size picture relative to its top-left corner 
    pict.resize(); 
}