无法将图像从 mysql 数据库添加到 pdf 文件

Question

Document myDocument = new Document();
                    PdfWriter myWriter = PdfWriter.getInstance(myDocument, 
new FileOutputStream(filePath));
                    myDocument.open();
                    Blob imageBlob = rs.getBlob("Signature");
                    byte[] imageBytes = imageBlob.getBytes(1, (int) 
imageBlob.length());
                    Image image = Image.getInstance(imageBytes);
                    image.scaleAbsolute(300,300);
                    myDocument.add(image);

I am trying to get Image from the database stored in the data type of medium blob. I have tried everything and checked various codes on stackoverflow but not bale to resolve an error. Each time it is showing that getInstance() method not found.

Answer 1

For

byte[] imageBytes = imageBlob.getBytes(1, (int) imageBlob.length());
Image image = Image.getInstance(imageBytes);

you get a "getInstance() method not found" error.

As the iText Image class clearly does have a static getInstance method with a single byte[] argument, this indicates that the Image class here does not refer to the iText Image class but instead to a different one, probably the awt Image class.

Thus, look at your imports, probably you import some whole packages which may contain their own Image class and so mask the iText Image class.

Answer 2

Blob imageBlob1 = rs.getBlob("Image");
                      byte[] imageBytes1 = imageBlob1.getBytes(1, (int) imageBlob1.length());
                     com.itextpdf.text.Image image1 = com.itextpdf.text.Image.getInstance(imageBytes1);
                     image1.scaleToFit(80f, 350f);
                     image1.setAbsolutePosition(430,680);
                      image1.scaleAbsoluteWidth(70);
                     image1.scaleAbsoluteHeight(80);
                     myDocument.add(image1);

The above code worked for me..

Answer 3

This code is working for me

try {
    String sql1 = " Select foto from ishirahamwe.abanywanyi where numero = \'" + strId + "\'";
    Statement statement = conn.prepareStatement(sql1);
    rs = statement.executeQuery(sql1);
    if (rs.next()) {
                    
        Blob imageBlob1 = rs.getBlob("foto");
        byte[] imageBytes1 = imageBlob1.getBytes(1, (int) imageBlob1.length());
        com.lowagie.text.Image image1 = com.lowagie.text.Image.getInstance(imageBytes1);
        image1.scaleToFit(80f, 350f);
        image1.setAbsolutePosition(430,680);
        image1.scaleAbsoluteWidth(70);
        image1.scaleAbsoluteHeight(80);
        document.add(image1);

    }

} catch (Exception e1) {
    e1.printStackTrace();
}