从java中的json字符串访问嵌套数组和对象中的数据（json-simple）

Question

我无法从内部元素访问嵌套对象的数据。这是json字符串 -

 {"created_at":"Tue Jun 14 04:06:55 +0000       2016",
"id":7426,
"id_str":"7425",
"text":"sample",
"user":{"id":529094887,"id_str":"529094887","name":"One Direction Japan","screen_name":"1D_OfficialJP"}
"entities":{"hashtags":[{"text":"ChoiceLoveSong"},{"text":"1DJP"],"media_url":"http:\/\/pbs.twimg.com\/media\/Ck4ijC2UkAA59rU.jpg",]}}

这是我的代码 -

try{        JSONParser parser = new JSONParser();
            JSONObject jsonObject = (JSONObject) parser.parse(jsontext);

            createdat = (String) jsonObject.get("created_at");
            System.out.println(createdat);

            twittertext = (String) jsonObject.get("text");
            System.out.println(twittertext);

            if (jsonObject.get("id")!= null)
            id = (long) jsonObject.get("id");
            System.out.println(id);

            id_str = (String) jsonObject.get("id_str");
            System.out.println(id_str);

          // loop array

            JsonNode json = new ObjectMapper().readTree(jsontext);
           JsonNode user_fields = json.get("user");

           name = user_fields.get("name").asText();
           System.out.println(name);
           scrname=user_fields.get("screen_name").asText();
           System.out.println(scrname);

          JsonNode entities_fields = json.get("entities");
         String hashtags = entities_fields.get("hashtags").asText();
         System.out.println("hashtags is "+ hashtags);
         JSONArray hashtagsContent = (JSONArray) jsonObject.get("hashtags");
         Iterator<String> entitiesNames = entities_fields.getFieldNames();

                     while (entitiesNames.hasNext()) {
                         System.out.println(entitiesNames.next());     
                          } 

                    jsonObject.get("user_mentions");

                   }

// followed by catch block ....

实际上我对从hashtag数组中提取数据感兴趣，特别是我想将这些数据存储在一个数组中。上面的代码我只能打印键而不是实体对象的值。此外，阵列中的元素数量可能会有所不同