Serialize Java 8 Stream with Jersey

Question

How can I serialize a Java 8 java.util.Stream with Jersey. I tried to write a MessageBodyWriter, but I need to know how to compose (decora

Answer 1

In line with the purpose of use streams (without using stream.collect(Collectors.toList())), there's this interesting article showing how to serialize large data from a database.

It's something like this...

@GET
@Produces( "application/json" )
public Response streamGeneratedUuids() {

    return getNoCacheResponseBuilder( Response.Status.OK ).entity( new StreamingOutput() {

        @Override
        public void write( OutputStream os ) throws IOException, WebApplicationException {
            try (PrintWriter writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(os))) ) {
                //iterate the java.util.stream and write to the OutputStream
                writer.print("....");       
            }
        }
    }).build();
}

It's not implemented with a MessageBodyWriter, but could adapted in my opinion.