来自JSONObject的指定对象

问题描述

我有 JSONObject ，其中包含如下所示并创建的类 Markets 包含所有字段。我想将 JSONObject 元素放置到 Markets 的创建对象中。例如： Markets markets = new Markets（），然后把元素放到 JSONObject 到 markets ，我希望能够获得 markets.getInstrumentName（）。我怎么做到这一点？

我尝试使用 Gson ，像这样 Markets markets = gson2.fromJson（jsonObject，Markets.class）; 但是有不同的类型，这是错误的方法。

JSONObject

  {
map：{
netChange ：-81.0，
instrumentType：INDICES，
percentageChange：-1.31，
scalingFactor：1，
epic：IX.D. FTSE.DAILY.IP，
updateTime：00:02:48，
updateTimeUTC：23:02:48，
offer：6095.8，
instrumentName：FTSE 100，
高：6188.3，
低：6080.8，
streamingPricesAvailable：true，
marketStatus： 可交易，
delayTime：0，
过期：DFB，
出价：6094.8 
} 
} 
  

Markets ：



  class Markets {
 private double bid; 
私人双人优惠; 
 private int delayTime; 
 private String史诗; 
私人字符串到期; 
私人双高; 
私人双低; 
 private String instrumentName; 
 private String instrumentType; 
私人字符串marketStatus; 
 private double netChange; 
 private double percentageChange; 
 private int scalingFactor; 
私有布尔streamingPricesAvailable; 
私人字符串updateTime; 
私人字符串updateTimeUTC; 
 
 // getters and setters 
} 
  




解决方案

使用Jackson库

  JSONObject jsonObject = // ... 
 ObjectMapper mapper = new ObjectMapper（）; 
 Markets markets = mapper.readValue（jsonObject.toString（），Markets.class）; 
  

I have JSONObject which contains as shown below and created class Markets contained all fields. I want put JSONObject elements to created object of Markets.

Example: Markets markets = new Markets(),then put elements from JSONObject to markets and I want to be able to get markets.getInstrumentName(). How can I do this ?

I try using Gson, like this Markets markets = gson2.fromJson(jsonObject, Markets.class); but there are different types and it is wrong way.

JSONObject:

{
  "map": {
    "netChange": -81.0,
    "instrumentType": "INDICES",
    "percentageChange": -1.31,
    "scalingFactor": 1,
    "epic": "IX.D.FTSE.DAILY.IP",
    "updateTime": "00:02:48",
    "updateTimeUTC": "23:02:48",
    "offer": 6095.8,
    "instrumentName": "FTSE 100",
    "high": 6188.3,
    "low": 6080.8,
    "streamingPricesAvailable": true,
    "marketStatus": "TRADEABLE",
    "delayTime": 0,
    "expiry": "DFB",
    "bid": 6094.8
  }
}

Markets:

class Markets {
    private double bid;
    private double offer;
    private int delayTime;
    private String epic;
    private String expiry;
    private double high;
    private double low;
    private String instrumentName;
    private String instrumentType;
    private String marketStatus;
    private double netChange;
    private double percentageChange;
    private int scalingFactor;
    private boolean streamingPricesAvailable;
    private String updateTime;
    private String updateTimeUTC;

    //getters and setters
}

解决方案

Using Jackson library

JSONObject jsonObject = //...
ObjectMapper mapper = new ObjectMapper();
Markets markets = mapper.readValue(jsonObject.toString(), Markets.class);

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