java - 如何从对象内部的数组中获取内部值？

Question

我想从 JSON 中获取纬度和经度值，它由两个对象“stoppage”和“routePlaceback”组成，现在我只能从“routePlaceback”获取数据，但我不知道如何获取仅获取纬度和经度的值？代码如下，

import java.io.FileReader;
import java.util.ArrayList;
import java.util.Iterator;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;

public class Finder_Json 
{
@SuppressWarnings("rawtypes")
public static void main(String[] args) throws Exception  
{
// parsing JSON file
    Object sampleFile_object = new JSONParser().parse(new FileReader("sample.json")); 

// typecasting object to JSONObject 
    JSONObject sampleFile_JSONObject = (JSONObject) sampleFile_object;

    JSONArray routePlaceback = (JSONArray) sampleFile_JSONObject.get("routePlaceback");
    Iterator iterator_1 = routePlaceback.iterator();

    while (iterator_1.hasNext())
    {
        System.out.println(iterator_1.next());
        System.out.println("\n");
    }
}
}

我的 sample.json 文件包含，

{
"stoppage":
    [
        {
          "latitude": "23.074207",
          "longitude": "72.557227",
          "record_date": 1556217000,
          "start_time": 1556217000,
          "end_time": 1556304360,
          "duration_time": 1456
        }
    ],
"routePlaceback":

    [
        {
          "distance": 0.36,
          "longitude": "72.502385",
          "ignition": 1,
          "record_date": 1556303400,
          "speed": 53.708,
          "latitude": "23.034403"
        },
        {
          "distance": 0.38,
          "longitude": "72.506072",
          "ignition": 1,
          "record_date": 1556303430,
          "speed": 25.927999,
          "latitude": "23.034045"
        }
    ]
}

这是我运行上述代码时得到的结果，

但我想要的输出是，

23.034403, 72.502385

23.034045, 72.506072

Answer 1

您可以在显示时提取所需的值:

while (iterator_1.hasNext())
{
    JSONObject obj = (JSONObject) iterator_1.next()l
    System.out.println(obj.get("latitude")+" , "+obj.get("longitude"));
    System.out.println("\n");
}