如何提取我的简单阵列的数据

Question

我想提取我的jsonarray对象的所有注释，我找到了这篇文章https://www.mkyong.com/java/json/json-simple-exmple-example-read-and-and-write--json/。问题是我的jsonarray是一种"数组"：

[{"AnnotationOfzelda":
 [{"annotation":
  [{"duration":5000,"annotation":"salut","timestamp":2250.0}, 
   {"duration":5000,"annotation":"jp","timestamp":4570.0}]}, 
   {"duration":5000,"annotation":"asd","timestamp":3340.0}, 
   {"duration":5000,"annotation":"asd","timestamp":4040.0}]}]

我尝试了此代码(来自我链接的帖子(

 System.out.println(annotationJSON.toJSONString());
 Iterator<JSONObject> iterator = annotationJSON.iterator();
 while (iterator.hasNext()) {
  JSONObject factObj = (JSONObject) iterator.next();
  String annotation = (String) factObj.get("annotation");
  System.out.println(annotation);
 }

结果是" null"，我认为这是因为我需要进入数组"注释"，而目前我只在"注释"中

尝试一下您可以将其用于JSON(注释：" ASD"(或完整JSON中的特定值：

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.IOException;
import java.util.Iterator;
public class Sol {
    public static void main(String[] args) {
        String data = "[{"AnnotationOfzelda":n" +
                " [{"annotation":n" +
                "  [{"duration":5000,"annotation":"salut","timestamp":2250.0}, n" +
                "   {"duration":5000,"annotation":"jp","timestamp":4570.0}]}, n" +
                "   {"duration":5000,"annotation":"asd","timestamp":3340.0}, n" +
                "   {"duration":5000,"annotation":"asd","timestamp":4040.0}]}]";
        ObjectMapper objectMapper = new ObjectMapper();
        JsonNode jsonNode = null;
        try {
            jsonNode = objectMapper.readTree(data);
            Iterator iterator = jsonNode.iterator();
            while (iterator.hasNext()) {
                JsonNode node = (JsonNode) iterator.next();
                if (node.get("annotation") != null) {
                    System.out.println(node.get("annotation"));
                    continue;
                }
                if (node.iterator().hasNext()) {
                    iterator = node.iterator();
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

输出[{"持续时间"：5000，"注释"：" salut"，" timestamp"：2250.0}，{"持续时间"：5000，"注释"：" JP"，" Timestamp"：4570.0}]]" ASD" ASD"

尝试以下类似：

 JSONArray jsonArray = annotationJSON.getJSONArray("AnnotationOfzelda
    ");//getting array
     for (int i = 0; i < jsonArray.length(); i++) {
      JSONObject jsonobject= jsonArray.getJSONObject(i);//getting first element 
       String duration1= jsonobject.getString("duration");//getting duration
              String annotation1= jsonobject.getString("annotation");//getting annotation1
               String timestamp1= jsonobject.getString("timestamp");//getting timestamp
     JSONArray jsonObject1= jsonobject.getJSONArray("annotation"); //getting children array
      for (int j = 0; j < jsonObject1.length(); j++) {
             JSONObject object1 = jsonObject1.getJSONObject(j);
             String duration= object1.getString("duration");//getting duration
              String duration= object1.getString("annotation");//getting annotation
               String duration= object1.getString("timestamp");//getting timestamp
          System.out.println(""+duration+""annotation""+timestamp) ;
         }
    }

我找到了一种方法，即使它并不是真的很好看

System.out.println(annotationJSON.toJSONString());
JSONObject tmp = (JSONObject) annotationJSON.get(0);
System.out.println("......");
JSONArray tmpArr = (JSONArray) tmp.get("AnnotationOfzelda");
for (int i = 0; i < tmpArr.size(); i++) {
 tmp = (JSONObject) tmpArr.get(i);
 System.out.println(tmp.get("annotation"));
}