Image contentUrl to byte array

[laurav]

Hi,

I'm using activiti 6.0 rest api and trying to save a process .png image as BLOB in my database.

I run a rest get call to the image contentUrl (http://localhost:8080/activiti-rest/service/repository/deployments/1234/resourcedata/image.png) present in my process resources:

restResponse = rest.get(result[1]['contentUrl']){
    auth username,password 
}

How do I convert this response to a byte[ ]?

thanks for your help

[daisuke-yoshimo]

What's rest client library do you use in the following code?

Java data type that you will receive depends on the implementation on the client side(Rest client library).

restResponse = rest.get(result[1]['contentUrl']){
    auth username,password 
}

If now you receive it as InputStream, you can convert it to byte[] by the method of the following article.

bytearray - Convert InputStream to byte array in Java - Stack Overflow 

[laurav]

Sorry for not mentioning this...I am using grails : 

import grails.plugins.rest.client.RestBuilder
import grails.plugins.rest.client.RestResponse

RestBuilder rest = new RestBuilder()
RestResponse restResponse = rest.get(result[1]['contentUrl']){
    auth username,password 
}
byte[] png_image = IOUtils.copyToByteArray(restResponse)

And am getting this error:

No signature of method: static grails.io.IOUtils.copyToByteArray() is applicable for argument types: (grails.plugins.rest.client.RestResponse) values: [grails.plugins.rest.client.RestResponse@27a210e7]
Possible solutions: copyToByteArray(java.io.File), copyToByteArray(java.io.InputStream). 

[daisuke-yoshimo]

How about the following code?

I'm sorry that I don't know about groovy and grails.

I tried to write the example code by using the following sites.

RestResponse (grails-datastore-rest-client 1.0.0.BUILD-SNAPSHOT API) 

ResponseEntity (Spring Framework 5.0.2.RELEASE API) 

HttpEntity (Spring Framework 5.0.2.RELEASE API) 

import grails.plugins.rest.client.RestBuilder
import grails.plugins.rest.client.RestResponse

RestBuilder rest = new RestBuilder()
RestResponse restResponse = rest.get(result[1]['contentUrl']){
    auth username,password 
}
byte[] png_image = restResponse.responseEntity.getBody().getBytes()