RESTEasy：在响应中返回InputStream

Question

I'm working on a service to PUT and GET InputStream objects based on a key - these can be anything from basic Strings to files. Here is the PUT method which appears to work just fine:

@PUT
@Path("{key}")
@Consumes(MediaType.MULTIPART_FORM_DATA)
public Response addData(
    final @PathParam("key") String key,
    final InputStream data) {
  final Service service =  new Service();
  try {
    service.addData(key, data);
  } finally {
    IOUtils.closeQuietly(data
  }
  return Response.status(204).build();
}

Now when I want to get the data (based on a key) I want to return the InputStream which is how the object is stored and retrieved. This is what I have currently:

@GET
@Path("/{key}")
@Produces(MediaType.APPLICATION_OCTET_STREAM)
  public InputStream getData(
    @PathParam("key") String key) {
  // get service and do other stuff ...
  return service.getData(); //This is an InputStream
}

When I send a GET, I get a status 200 and a 'Response Does Not Contain Any Data' message ... when I examine the request in Fiddler, it doesn't look like the data is attached. Am I missing something simple here? Thanks.

Edit: Here are the responses from:

• Advanced Rest Client: http://i.imgur.com/OfSSAxj.jpg

• Fiddler: http://i.imgur.com/DTtkByr.jpg

It seems like there's nothing attached to the response, but I'm not sure. Is there a good way to test whether or not it's returning the InputStream?

---

Edit2: Interesting. Per peeskillet's suggestion of reading the data to see if it's even there I did this:

final String data = IOUtils.toString(stream);

This returns "" when it should be returning "test" . Now I'm not super familiar with IOUtils so maybe their toString(InputStream) is causing it to be "test" , but that would suggest that it's not getting set properly in the service.

My service for getting the InputStream data looks something like this:

final InputStream data = getData(_key);
  try {
    if (data == null) {
      return null;
    }
    return object.newBuilder()
      .setKey(_key)
      .setData(data)
      .build();
  } finally {
    IOUtils.closeQuietly(data);
  }

Would anything in the service be causing the stream to be read therefore making it non-accessible?

---

Edit3: The problem is in the service when I set the data to be returned. If I remove IOUtils.closeQuietly(data); I'm able to get the data back just fine. However this causes issues because I leave an InputStream open... any workaround suggestions?

Answer 1

Returning an InputStream should work unless somebody already read from the stream. You can't read twice from an InputStream .

Answer 2

The problem was related to leaving the InputStream open. However, there was a bug in the version of RestEasy that caused the InputStream to not be closed. The ticket/fix is found here: https://issues.jboss.org/browse/RESTEASY-741