6
String json = "{\"id\":123,\"name\":\"小明\",\"address\":\"{\"pro\":\"北京\",\"city\":\"北京市\"}\"}";
Object o = (Object)json;
String tmp = o.toString();
JSONObject jo = JSONObject.parseObject(tmp);
Object address = jo.get("address");
String a = address.toString();
System.out.println(jo.toString());