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BLOB from Java to Flex via BlazeDS
| By Rich Tretola | December 31, 2008 | |
| 5,008 views |
I was recently tasked with the job of loading images into a Flex app that were being stored within an Oracle database under data type Blob.
It turns out that this is pretty simple to do. The following is a simplified example as my original involved some complex objects and Hibernate:
After selecting the field from the database and storing it to the variable imageBlob, I simply converted it to a byte array using the getBytes() method and then and store it in the variable imageBA .
Java:
1 2 | Blob imageBlob = // image data returned from Database as Blob byte[] imageBA = imageBlob.getBytes(1, (int) imageBlob.length()); |
On the Flex side I simply bind the imageBA to the image source.
Flex
1 | <mx:Image source="{imageBA}" /> |
Topics: BlazeDS, Flex | 16 Comments »
December 31st, 2008 at 5:12 pm
Why didn’t you just send the byte array directly through BlazeDS ?
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Rich Tretola Reply:
January 1st, 2009 at 10:21 am
I had a typo in my original code when I tried that so I assumed there was something more devious at work within my AMF connection. My mistake, I found the typo and now all is fine simply passing the byte[]. I have updated the entry.
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January 21st, 2009 at 2:56 pm
are you shure that works?? what is the type of de imageBA in de flex side? you are using RemoteObject? can anyone put some sample of passing images from java to flex via BlazeDS? thanks
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February 5th, 2009 at 12:19 pm
Just be sure that your Java side datatype is byte[]; and your ActionScript side datatype is flash.utils.ByteArray; and you then can simply bind that value to the source property of an Image component.
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February 5th, 2009 at 5:24 pm
You are using an ItemRenderer within the grid? I am confused by what you are trying to do. I suggest you try binding your byte array to an Image component outside of the datagrid first.
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February 5th, 2009 at 6:11 pm
Not sure what you mean by customized Java classes. You simply need to convert it to a byte array as in my sample code above. It sounds like there may be two issues.
1) make sure when you receive the data within Flex it is actually a byte array
2) Make sure you are using your ItemRenderer properly any binding to the correct property.
If you are still having problems, let me know and I’ll try to help you further through email.
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February 5th, 2009 at 6:23 pm
i receive the data as a byte array
and ItemRenderer is used properly, actually i have test it with a Image on my local disk.
would you like to see my code? it is not so big because is just a small prototipe.
Thnks so much!
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ragin Reply:
August 24th, 2009 at 3:54 am
Please share the code
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February 5th, 2009 at 7:44 pm
I sent you an email, please reply with your code sample.
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ragin Reply:
August 24th, 2009 at 3:53 am
please share the source.
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March 13th, 2009 at 4:57 pm
I’m also sending an array of bytes from Java to Flex.
I have a tilelist which renders thumbnails. In my Thumbnail class I have the following code, where data.cover points to the byte array.
But instead of an image it shows a red cross.. Do you know what the problem is here?
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March 16th, 2009 at 4:46 am
Who can give me a copy of the source code . thanks a lot.
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March 16th, 2009 at 4:46 am
Who can send the source code . thanks a lot
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Rich Tretola Reply:
August 24th, 2009 at 7:29 am
There is no additional source code. Everything is in the original post. Just those 3 lines!
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August 3rd, 2009 at 11:56 am
Useful tip,, Thanks
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October 27th, 2009 at 1:46 am
i find it hard to play a video from blob data type..
please help me get my values from my DB through php
then play it to flex
thanks in advance
-cj
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