Question

I have a form bean with attributes id, desc and imageByteArray. Struts action gets executed and it redirects to a JSP where i want to access these bean attributes like id, desc and convert the imageByteArray and display it as an image. I tried this post, but that’s not working for me.

I encode the bytearray using Base64 – where this.bean.imageByteArray refers to the form bean

this.bean.setImageByteArray(new org.apache.commons.codec.binary.Base64().encode(imageInByteArr));

I tried this, but not working

<img src="data:image/jpg;base64,<c:out value='${bean.imageByteArray}'/>" />

Byte array (byte[] imageByteArray) refers a base64 encoded JPG image and I’m getting the following img tag as output and obviously nothing gets displayed,

<img src="data:image/jpg;base64,[B@2e200e">

Any idea how to convert base64 byte array and display as an image in JSP?

Answer 1

What you get is just the toString output of an array. You need however the byte array converted to a String.

You should create a method in bean

public String getByteArrayString()
{
   return new String(this.imageByteArray);
}

and reference this in your JSP.

While technically you should define which encoding to use for an array of base64 bytes this is not necessary as all characters are in the standard 7bit ASCII range.