gistfile1.java

    @Test(groups = "standalone")
    public void basicDefaultTest() throws Throwable {
        AsyncHttpClientConfig client = new AsyncHttpClientConfig.Builder().setResumableDownload(true).build();
        AsyncHttpClient c = new AsyncHttpClient(client);

        final RandomAccessFile file = new RandomAccessFile("800m.avi", "rw");

        Response r = c.prepareGet("http://192.168.2.106:8081/800m.avi").execute(new AsyncCompletionHandlerBase(){

            private long byteTransferred = 0;

            /* @Override */
            public STATE onBodyPartReceived(final HttpResponseBodyPart content) throws Exception {
                file.seek(byteTransferred);
                file.write(content.getBodyPartBytes());
                byteTransferred += content.getBodyPartBytes().length;                                                      
                return STATE.CONTINUE;
            }

        }).get();

        assertEquals(r.getStatusCode(), 200);
        file.close();
    }