How to convert an <img… in html to byte [] in Java

问题

I have opened a webpage in HtmlUnit headless browser. Now that webpage contains a image html tag as follows:

<img src="..." />

So I want that image only. But the problem is that the same src URL of the image shows diff. image each time. Means, if we refresh the img src URL, then it shows diff. image each time.

So how to get the image that is displayed on the html page.

回答1:

When you get the HTMLPage, you have to get the image through one of its method. You can then get an HtmlImage, which can be saved as a file. You'll just have to analyse this file later.

回答2:

This is the function to store your image with fully qualified I

   protected String saveImage(String imageUrl) throws Exception {

   InputStream inputStream;
   OutputStream os;
   ByteArrayOutputStream byteArrayOutputStream;
   String destinationFile = "File path where you want ot store the image";
   URL url = new URL(imageUrl);
   inputStream = url.openStream();
   byteArrayOutputStream = new ByteArrayOutputStream();
   os = new FileOutputStream(destinationFile);
   int read;
   String barcode = null;
   while ((read = inputStream.read()) != -1) {
       os.write(read);
       byteArrayOutputStream.write(read);
       barcode = byteArrayOutputStream.toString();
   }
   inputStream.close();
   os.close();
   byteArrayOutputStream.close();



   return barcode;

}

来源：https://stackoverflow.com/questions/2138961/how-to-convert-an-img-in-html-to-byte-in-java