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?

Just in case if you ever run into a situation where you have to stream the content of a very large JSON object, which might produce OutOfMemory errors on toString() method invocations use mutliple ByteArrayInputStreams as prestented in this post here — Roman Vottner
– Roman Vottner, Commented Feb 19, 2016 at 14:56

Chthonic Project · Accepted Answer · 2014-05-22 20:39:19Z

25

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).

answered May 22, 2014 at 20:39

Chthonic Project

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3 Comments

This 0ne Pr0grammer Over a year ago

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 Over a year ago

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

Ayyappa Over a year ago

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

Yazan · Accepted Answer · 2014-05-22 20:39:03Z

7

if you want bytes, use this

json.toString().getBytes()

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

InputStream fis = new FileInputStream(savedFile);

answered May 22, 2014 at 20:39

Yazan

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