我正在使用Retrofit来获取JSON答复。
这是我实施的一部分-
@GET("/api/report/list")
Observable<Bills> listBill(@Query("employee_id") String employeeID);
而条例草案类是-
public static class Bills {
@SerializedName("report")
public ArrayList<BillItem> billItems;
}
BillItem
类如下-
public static class BillItem {
@SerializedName("id")
Integer entryID;
@SerializedName("employee_id")
Integer employeeDBID;
@SerializedName("type")
String type;
@SerializedName("subtype")
String subtype;
@SerializedName("date")
String date;
@SerializedName("to")
String to;
@SerializedName("from")
String from;
@SerializedName("amount")
Double amount;
@SerializedName("location")
String location;
@SerializedName("remark")
String remark;
@SerializedName("ispaid")
String isPaid;
@SerializedName("created_at")
String createdAt;
@SerializedName("updated_at")
String updateAt;
}
问题是有时REST API返回一个BillItem
对象的数组,但是有时它只是一个key-value
对。如何处理这种情况?
收到此响应后,一切正常,因为JSONArray
被映射到ArrayList<BillItem>
-
{
"emp":{
"id":41,
"name":"",
"email":"",
"created_at":"2016-02-01 10:36:38",
"updated_at":"2016-02-01 10:36:38"
},
"report":[
{
"id":175,
"employee_id":41,
"type":"Travel",
"subtype":"Car",
"date":"2016-02-02 00:00:00",
"to":"gaha",
"from":"hshsj",
"amount":"64",
"location":"",
"remark":"shhs",
"ispaid":false,
"created_at":"2016-02-01 13:52:52",
"updated_at":"2016-02-01 13:52:52"
},
{
"id":179,
"employee_id":41,
"type":"Travel",
"subtype":"Car",
"date":"2016-02-01 00:00:00",
"to":"Gsh",
"from":"Dgdh",
"amount":"7646",
"location":"",
"remark":"Shsh",
"ispaid":false,
"created_at":"2016-02-01 14:39:48",
"updated_at":"2016-02-01 14:39:48"
}
]
}
但是,有时响应是这样的,它给出了JsonSyntaxException
-
{
"emp":{
"id":41,
"name":"",
"email":"",
"created_at":"2016-02-01 10:36:38",
"updated_at":"2016-02-01 10:36:38"
},
"report":{
"1":{
"id":175,
"employee_id":41,
"type":"Travel",
"subtype":"Car",
"date":"2016-02-02 00:00:00",
"to":"gaha",
"from":"hshsj",
"amount":"64",
"location":"",
"remark":"shhs",
"ispaid":false,
"created_at":"2016-02-01 13:52:52",
"updated_at":"2016-02-01 13:52:52"
},
"2":{
"id":179,
"employee_id":41,
"type":"Travel",
"subtype":"Car",":"2016-02-01 00:00:00",
"to":"Gsh",
"from":"Dgdh",
"amount":"7646",
"location":"",
"remark":"Shsh",
"ispaid":false,
"created_at":"2016-02-01 14:39:48",
"updated_at":"2016-02-01 14:39:48"
},
"0":{
"id":181,
"employee_id":41,
"type":"Travel",
"subtype":"Car",
"date":"2016-02-01 00:00:00",
"to":"ggg",
"from":"vg",
"amount":"0",
"location":"",
"remark":"cvv",
"ispaid":false,
"created_at":"2016-02-01 17:43:43",
"updated_at":"2016-02-01 17:43:43"
},
"3":{
"id":182,
"employee_id":41,
"type":"Travel",
"subtype":"Car",
"date":"2016-02-01 00:00:00",
"to":"Haha",
"from":"Ahah",
"amount":"0",
"location":"",
"remark":"Ahah",
"ispaid":false,
"created_at":"2016-02-01 17:53:58",
"updated_at":"2016-02-01 17:53:58"
}
}
}
如何处理这样的答复?
java大神给出的解决方案
使用Gson解串器时,可以检查JsonElement中的类型:
Gson gson = new GsonBuilder()
.registerTypeAdapter(BillItem.class, new BillItemDeserializer())
.registerTypeAdapter(Bills.class, new BillsDeserializer())
.create();
RestAdapter.Builder builder = new RestAdapter.Builder()
//...
.setConverter(new GsonConverter(gson));
public class BillsDeserializer implements JsonDeserializer<StringList> {
public Bills deserialize(JsonElement json, Type typeOfT,
JsonDeserializationContext context) throws JsonParseException {
BillItemList value = new BillItemList();
if (json.isJsonArray()) {
for (JsonElement element : json.getAsJsonArray()) {
value.add(gson.fromJson(element, BillItem.class));
}
} else {
value.add(gson.fromJson(element, BillItem.class));
}
return value;
}
}
请参见示例:Gson deserialization - Trying to parse a JSON to an Object
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