private static void parseJson () {
try {
DoubanShuoAttachementObj att = generateAtt();
JsonHttpContent content = new JsonHttpContent(new JacksonFactory(), att);
ByteArrayOutputStream os = new ByteArrayOutputStream();
content.writeTo(os);
String result = new String(os.toByteArray());
System.out.println("result ! : " + result);
System.out.println("getdate : " + (String)content.getData());
} catch (IOException ex) {
Logger.getLogger(PlayGround.class.getName()).log(Level.SEVERE, null, ex);