Converting image into Base64

try this .

TO load an image :
java.net.URL imageURL = myDemo.class.getResource("images/myImage.gif");
...
if (imageURL != null) {
    ImageIcon icon = newImageIcon(imageURL);
}

to convert to Base64:
https://www.experts-exchange.com/questions/20844229/How-to-convert-java-awt-image-BufferedImage-image-to-be-encoded-base64.html?query=Converting+image+into+Base64&topics=86

http://javaalmanac.com/egs/java.applet/LoadImageApplet.html

> Try this
>
>    public static String imageUrlToBase64(String url) {
>          byte[] buffer = null;
>          try {
>               URLConnection conn = new URL(url).openConnection();
>               buffer = new byte[conn.getContentLength()];
>               DataInputStream in = new DataInputStream(conn.getInputStream());
>               in.readFully(buffer);
>          } catch (Exception e) {
>               e.printStackTrace();
>               return null;
>          }
>          return new String(new Base64().decode(buffer));
>     }

Thanx, I'll try this. :-)
Another question though: I also need to extract the file extension from the file. I need to forward either "GIF" og "JPG" in the XML file.

>>I also need to extract the file extension from the file

Well you know that anyway don't you? - it's in the url ;-)

Hehe. I'm afraid it's not that easy.
The images are typically named with a customer's unique id,
and it is from this ID I will retrieve the right image. And since
I have no control over whether the images are of type gif or jpg,
I need to find out somehow. I hope this is possible though. :)

So the run is like this:

My method reaches into a specific folder, and finds an image based on
comparing the customer's ID (which the method already has) with the
name of the image.  (The images are placed in the folder by someone else)

The whole image is to be converted into a Base64-String
(the code you provided above I hope does this part)

Then, the String is inserted into an XML file along with the file extension.
(The file extension I don't know how to retrieve...)

You mean the url doesn't have the right extension?

All I have is a location on my server. For example "c:\newaccounts\images\"

I must iterate all the files in that location and compare their names to an account
id that I get from somewhere else, and then retreive the right file. And then go on with
the encoding and so on.

If you're on the same machine:

File imageDirectory = new File("c:/newaccounts/images");
File[] images = imageDirectory.list(new FileFilter() {
     public boolean accept(File f) {
          String name = f.getName().toLowerCase();
          return name.endsWith("gif") || name.endsWith("jpg"); // (More if necessary)
     }
});

then adapt my code to

buffer = new byte[(int)f.length()];

starting from the old

>>buffer = new byte[conn.getContentLength()];

>>File[] images = imageDirectory.list

should have been

File[] images = imageDirectory.listFiles

If it's not on the same machine, but visible on your network, you should be able to do


File imageDirectory = new File("\\\\machine_name\\sharename");

i have an easier approach to recognize for gif or jpg

open any GIF wth editor and find out that they all start with GIF
so:

byte [] giftest = "GIF".getBytes("UTF8");

public static String imageUrlToBase64(String url) {
>          byte[] buffer = null;
>          try {
>               URLConnection conn = new URL(url).openConnection();
>               buffer = new byte[conn.getContentLength()];
>               DataInputStream in = new DataInputStream(conn.getInputStream());
>               in.readFully(buffer);
>          } catch (Exception e) {
>               e.printStackTrace();
>               return null;
>          }
>          return new String(new Base64().decode(buffer));
>     }

//compare giftest to bufer
int i = 0;
while (i < giftest.length){
if (giftest[i] == buffer[i]) i++;
}
if (i ==3 )==> gif else jpg

for details on magicnumbers see /etc/magic or linux file command

btw
>> return new String(new Base64().decode(buffer));

should be return new String(new Base64().encode(buffer));

Good catch ;-)

wow! Thanks!

It'll take some time before I get to this part, but
I'm looking forward to try this on :)

not even an assist....

;-(

:-)