java.net.URL read stream to byte[]

by

There’s no guarantee that the content length you’re provided is actually correct. Try something akin to the following:

ByteArrayOutputStream baos = new ByteArrayOutputStream();
InputStream is = null;
try {
  is = url.openStream ();
  byte[] byteChunk = new byte[4096]; // Or whatever size you want to read in at a time.
  int n;

  while ( (n = is.read(byteChunk)) > 0 ) {
    baos.write(byteChunk, 0, n);
  }
}
catch (IOException e) {
  System.err.printf ("Failed while reading bytes from %s: %s", url.toExternalForm(), e.getMessage());
  e.printStackTrace ();
  // Perform any other exception handling that's appropriate.
}
finally {
  if (is != null) { is.close(); }
}

You’ll then have the image data in baos, from which you can get a byte array by calling baos.toByteArray().

This code is untested (I just wrote it in the answer box), but it’s a reasonably close approximation to what I think you’re after.

More Related Contents:

  1. How to access resources in JAR file?
  2. Byte Array to Image object
  3. Type mismatch: cannot convert from double to double[]
  4. How do I determine whether an array contains a particular value in Java?
  5. How do I reverse an int array in Java?
  6. Do Java arrays have a maximum size?
  7. How do I remove objects from an array in Java?
  8. How to convert an ArrayList containing Integers to primitive int array?
  9. Parsing query strings on Android
  10. Java – How to find the redirected url of a url?
  11. Get domain name from given url
  12. Unable to read JPEG image using ImageIO.read(File file)
  13. How to make an array of arrays in Java
  14. Java – generate Random range of specific numbers without duplication of those numbers – how to?
  15. What is the most elegant way to check if all values in a boolean array are true?
  16. Android: how to parse URL String with spaces to URI object?
  17. Java String array: is there a size of method?
  18. How to get the Array Class for a given Class in Java?
  19. Find duplicate element in array in time O(n)
  20. Read .txt file into 2D Array
  21. Efficiently color cycling an image in Java
  22. Java: Multi-dimensional array vs. one-dimensional
  23. How to use Selenium WebDriver on local webpage (on my PC) instead of one located somewhere online?
  24. How do I resize images inside an application when the application window is resized?
  25. Easiest way to convert a Blob into a byte array
  26. Convert byte[] to Base64 string for data URI
  27. In Java, when is the {a,b,c,…} array shorthand inappropriate, and why?
  28. Array with UserType in Hibernate and PostgreSQL –> MappingException
  29. Display a jpg image on a JPanel
  30. Java generics and array initialization

Leave a Comment