Question

我有以下json对象

{
    "result": {
        "today": [],
        "week": [{
            "ride_id": "23829994",
            "trip_average_speed": "46.15",
            "trip_distance": "2.20002797646063",
            "trip_time": "2014-02-13 06:39:30+00"
        }, {
            "ride_id": "15761690",
            "trip_average_speed": "32.09",
            "trip_distance": "16.3443284767516",
            "trip_time": "2014-02-13 11:40:30+00"
        }],
        "month": []
    }
}

如何将"today": []，"month": []和周值作为数组？

Answer 1

查看google-json及其user-guide。除非你特别想要杰克逊的东西。

希望这会帮助你开始

Answer 2

JSONObject obj = new JSONObject(" .... ");
JSONArray arr = obj.getJSONArray("week");
for (int i = 0; i < arr.length(); i++)
{
    String ride_id = arr.getJSONObject(i).getString("ride_id");
    String trip_average_speed = arr.getJSONObject(i).getString("trip_average_speed");
    String trip_distance = arr.getJSONObject(i).getString("trip_distance");
    String trip_time = arr.getJSONObject(i).getString("trip_time");
    System.out.println("ride_id");
}

您可以使用以上答案获取周数据。使用名为org.json的库。

谢谢..

Answer 3

使用Google gson库，您可以轻松地在Java中处理Json。请参考Userguide，您可以从here

下载jar

尝试以下代码从Json中检索"today": [], "month": [] and "week": []数组。

String jsonStr = "your json string";

Gson gson = new Gson();
JsonObject jsonObj = gson.fromJson (jsonStr, JsonElement.class).getAsJsonObject;

//--------------- Getting week[] as Arraylist ------------------------

public class Week   
{
   private long ride_id;
   private double trip_average_speed;
   private double trip_distance;
   private String trip_time;

   //Setters and Getters for all the parameters
}

ArrayList<Week> returnedArtworks = gson.fromJson(jsonObj.get("week").getAsString(), new TypeToken<List<Week>>(){}.getType());

//---------------- Getting month[] as Arraylist -----------------------

public class Month   
{
   //Parameters
   //Setters and Getters for all the parameters
}

ArrayList<Month> returnedArtworks = gson.fromJson(jsonObj.get("month").getAsString(), new TypeToken<List<Month>>(){}.getType());

//----------------- Getting today[] as Arraylist ----------------------

public class Today   
{
   //Parameters
   //Setters and Getters for all the parameters
}

ArrayList<Today> returnedArtworks = gson.fromJson(jsonObj.get("today").getAsString(), new TypeToken<List<Today>>(){}.getType());

Answer 4

一种方法是为today，week，month和result创建POJO。 result课程将包含today，week和month所有其他三个的列表。
创建一个包含result类对象的主POJO MyJson。现在您可以直接将此JSON解析到您的类中，并从getter方法中获取today，{{1}列表}和week数组要将JSON字符串解析为类对象：

month

您的POJO课程如下：
MyJson.java

ObjectMapper mapper = new ObjectMapper();
MyJson resultObj = mapper.readValue(str, MyJson.class);  
//get List of week  
List<Week> week =  resultObj.getResult().getWeek();

Result.java

public class MyJson   
{
     private Result result;  
     //getter and setter method  
}

Today.java

public class Result   
{
    private List<Today> today;
    private List<Month> month;
    private List<Week> week;    
    //getter and setter method
}

Week.java

public class Today   
{
  private String date;  
  //other parameters and it's getter and setter method.  
}

Month.java

public class Week   
{
    private long ride_id;
    private double trip_average_speed;  
    //other parameters and it's getter and setter method.    
}

从JSON对象解析值

4 个答案: