Question

我想用动态JSON对象

解析以下JSON响应

{
  "id": 1,
  "last_login": "2016-07-16T12:46:29.621996Z",
  "point_of_sales": [
    {
      "Counter 4": {
        "type": "retail",
        "id": 6
      }
    },
    {
      "Counter 5": {
        "type": "retail",
        "id": 7
      }
    },
    {
      "Counter 6": {
        "type": "retail",
        "id": 8
      }
    }
  ]
}

此处的对象名称位于＆＃34; point_of_sales ＆＃34;数组是动态的，这使得使用Gson很难解析。这是我到目前为止所尝试过的，

@SerializedName("id")
@Expose
private Integer id;
@SerializedName("last_login")
@Expose
private String lastLogin;
@SerializedName("point_of_sales")
@Expose
private List<Map<String, Counter>> pointOfSales = new ArrayList<Map<String, Counter>>();

.......

getter & setters

专柜课，

@SerializedName("type")
@Expose
private String type;
@SerializedName("id")
@Expose
private Integer id;

.......

getter & setters

按照这个程序，我可以转换对象但不能将它们从地图中提取到pojo类。

 for (Map<String, Counter> objectMap : response.getPointOfSales())
{
// How to extract the Counter pojo data from map list?
}

我也尝试过这种方式，但没有任何作用，

ArrayList<Counter> pojos = new ArrayList<Counter>();
                    try {
                        for (Map<String, Counter> objectMap : result.getPointOfSales()) {
                            Counter pojo = new Counter();
                            for (Map.Entry<String, Counter> property : objectMap.entrySet()) {
                                Method setter = Counter.class.getMethod("set" + property.getKey().substring(0, 1).toUpperCase() + property.getKey().substring(1), property.getValue().getClass());
                                setter.invoke(pojo, property.getValue());
                            }
                            pojos.add(pojo);
                        }
                    } catch (Exception e) {
                        e.printStackTrace();
                    }

                    for (Counter pojo : pojos) {
                        Log.e("result", "" + pojo.getId() + " " + pojo.getType());
                    }

有没有办法使用

来解析特定的数组

Gson
使用决斗解析技术手动解析特定部分并在Gson中解析其余部分？

我想将动态对象包装成pojo类。

Answer 1

你需要两件事。

您需要对模型类进行一些重构。
您需要添加一个JsonDeserializer来处理动态解析。

这是我将如何做到的：

<强> MainObject.java

.....
@SerializedName("point_of_sales")
SalesPoints mSales Points
.....

<强> SalesPoints.java

private List<Counter>mCounters;
//getter & setters.

<强> Counter.java

SerializedName("type")
private String type;
@SerializedName("id")
private int id; // use primitives instead of boxed primitives
private String mCounterString; // maybe you need it.

现在当你运行解析时，你将不得不这样做：

 MainObject object = new GsonBuilder().registerTypeAdapter(SalesPoints.class, new JsonDeserializer< SalesPoints >() {
        @Override
        public SalesPoints deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {
            SalesPoints sales = new SalesPoints();
            ArrayList<Counter>counters = new ArrayList<Counter>();
            JsonArray salesJson = json.getAsJsonArray();
            for(JsonElement object : json.getAsJsonArray()) {
                   Iterator<Map.Entry<String,JsonElement>> iterator = object.getAsJsonObject().entrySet().iterator();
                   while (iterator.hasNext())){
                          Map.Entry<String,JsonElement> entry = iterator.next();
                            String counterString = entry.getKey();
                            JsonElement counterObject = 
                                                    entry.getValue();
                            Counter counter = context.deserialize(counterObject, Counter.class);
                            counter.setCounterString(counterString);
                            counters.add(counter);
                        }          
            }
            sales.setCounters(counters);
            return sales;
        }
    }).create().fromJson(theJson);

现在解析MainObject时，它将包含包含所有计数器的SalesPoints。

注意：我可能拼错了一些单词，或者我可能忘记添加一些getAs..方法，因为我没有可能测试代码，但这是要走的路，你可以很容易调试它。

修改

对于改造，你需要做这样的事情：

Gson gson = new GsonBuilder().registerTypeAdapter(SalesPoints.class, new JsonDeserializer< SalesPoints >() { @Override public SalesPoints deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException { SalesPoints sales = new SalesPoints(); ArrayList<Counter>counters = new ArrayList<Counter>(); JsonArray salesJson = json.getAsJsonArray(); for(JsonElement object : json.getAsJsonArray()) { Iterator<Map.Entry<String,JsonElement>> iterator = object.getAsJsonObject().entrySet().iterator(); while (iterator.hasNext())){ Map.Entry<String,JsonElement> entry = iterator.next(); String counterString = entry.getKey(); JsonElement counterObject = entry.getValue(); Counter counter = context.deserialize(counterObject, Counter.class); counter.setCounterString(counterString); counters.add(counter); } } sales.setCounters(counters); return sales; } }).create(); new Retrofit.Builder().addConverterFactory(GsonConverterFactory.create(gson))//set remaining things fro your retrofit builder.

手动解析动态JSON对象的一部分以及Gson反序列化器

1 个答案: