How to Create InputStream Object from JsonObject

Question

I'm trying to figure out how one goes about retrieving the raw bytes stored in a JsonObject and turns that into an InputStream object?

I figured it might be something like:

InputStream fis = new FileInputStream((File)json.getJsonObject("data"));

Granted I haven't tried that out, but just wanted to know if anyone had any experience with this and knew the preferred way to do it?

Solution 1

You can convert a JSONObject into its String representation, and then convert that String into an InputStream.

The code in the question has a JSONObject being cast into File, but I am not sure if that works as intended. The following, however, is something I have done before (currently reproduced from memory):

String str = json.getJSONObject("data").toString();
InputStream is = new ByteArrayInputStream(str.getBytes());

Note that the toString() method for JSONObject overrides the one in java.lang.Object class.

From the Javadoc:

Returns: a printable, displayable, portable, transmittable representation of the object, beginning with { (left brace) and ending with } (right brace).

Solution 2

if you want bytes, use this

json.toString().getBytes()

or write a File savedFile contains json.toString, and then

InputStream fis = new FileInputStream(savedFile);

Comments

[This 0ne Pr0grammer]

So your solution does work, but I have a question as far as if you pass a file down into your rest call, why does it automatically convert that into an InputStream on the java side?

[Chthonic Project]

The String is converted to a sequence of bytes, which is, in turn, converted to an InputStream.

[Ayyappa]

Note that tostring method of JSONObject is not safe for non-ascii chars. It won't encode in utf-8