解析JSON文件Java

我想在 java中解析 JSON 文件,并从下面提到的文件中获取以下值：

{
  "status": "OK","origin_addresses": [ "Vancouver,BC,Canada","Seattle,État de Washington,États-Unis" ],"destination_addresses": [ "San Francisco,Californie,États-Unis","Victoria,Canada" ],"rows": [ {
    "elements": [ {
      "status": "OK","duration": {
        "value": 340110,"text": "3 jours 22 heures"
      },"distance": {
        "value": 1734542,"text": "1 735 km"
      }
    },{
      "status": "OK","duration": {
        "value": 24487,"text": "6 heures 48 minutes"
      },"distance": {
        "value": 129324,"text": "129 km"
      }
    } ]
  },{
    "elements": [ {
      "status": "OK","duration": {
        "value": 288834,"text": "3 jours 8 heures"
      },"distance": {
        "value": 1489604,"text": "1 490 km"
      }
    },"duration": {
        "value": 14388,"text": "4 heures 0 minutes"
      },"distance": {
        "value": 135822,"text": "136 km"
      }
    } ]
  } ]
}

从每个元素,我想获得距离和持续时间的值字段.我该怎么做？

解决方法

使用json.org参考实现( org.json homepage,Download here).代码有点乱,但我认为这是你要求的.您可以通过不创建所有这些对象来直接访问它们来获取大量快捷方式.我这样做的原因是试图让它更容易地遵循发生的事情.

package com.mypackage;
 
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
 
public class Main {
    public static void main(String[] args) {
        String jsonStr = "{\"status\": \"OK\",\"origin_addresses\": [ \"Vancouver,Canada\",\"Seattle,États-Unis\" ],\"destination_addresses\": [ \"San Francisco,États-Unis\",\"Victoria,Canada\" ],\"rows\": [ {\"elements\": [ {\"status\": \"OK\",\"duration\": {\"value\": 340110,\"text\": \"3 jours 22 heures\"},\"distance\": {\"value\": 1734542,\"text\": \"1 735 km\"}},{\"status\": \"OK\",\"duration\": {\"value\": 24487,\"text\": \"6 heures 48 minutes\"},\"distance\": {\"value\": 129324,\"text\": \"129 km\"}} ]},{\"elements\": [ {\"status\": \"OK\",\"duration\": {\"value\": 288834,\"text\": \"3 jours 8 heures\"},\"distance\": {\"value\": 1489604,\"text\": \"1 490 km\"}},\"duration\": {\"value\": 14388,\"text\": \"4 heures 0 minutes\"},\"distance\": {\"value\": 135822,\"text\": \"136 km\"}} ]} ]}";
 
        try {
            JSONObject rootObject = new JSONObject(jsonStr); // Parse the JSON to a JSONObject
            JSONArray rows = rootObject.getJSONArray("rows"); // Get all JSONArray rows
 
            for(int i=0; i < rows.length(); i++) { // Loop over each each row
                JSONObject row = rows.getJSONObject(i); // Get row object
                JSONArray elements = row.getJSONArray("elements"); // Get all elements for each row as an array
 
                for(int j=0; j < elements.length(); j++) { // Iterate each element in the elements array
                    JSONObject element =  elements.getJSONObject(j); // Get the element object
                    JSONObject duration = element.getJSONObject("duration"); // Get duration sub object
                    JSONObject distance = element.getJSONObject("distance"); // Get distance sub object
 
                    System.out.println("Duration: " + duration.getInt("value")); // Print int value
                    System.out.println("Distance: " + distance.getInt("value")); // Print int value
                }
            }
        } catch (JSONException e) {
            // JSON Parsing error
            e.printStackTrace();
        }
    }
}

解析JSON文件Java

解决方法

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