我知道这已被多次询问，但是看看已有的答案，我可以解决我的问题，所以任何帮助都会非常感激。
我正在尝试使用Retrofit 2使用自定义反序列化器将我的JSON响应解析为数组列表。但是它给了我错误
com.google.gson.JsonSyntaxException：java.lang.IllegalStateException：预期为BEGIN_ARRAY，但路径为$ 时为BEGIN_OBJECT
这是我试图解析的json响应
[
{
"category": "Accessories"
},
{
"category": "Apparel"
},
{
"category": "Audio CD"
},
{
"keyword": "Accessories & Supplies"
},
{
"keyword": "Audio & Video Accessories"
},
{
"keyword": "Combination Deodorants & Antiperspirants"
},
{
"_id": "57442700d0fcd01100d45cd8",
"prodName": "2015 High-end Case Cover zzzzzzz Animals dobermans nature puppies Samsung Galaxy S7 phone Case 3236386XK945021729S7 Jordan Dowdy's Shop"
},
{
"_id": "575a95fbb9167e100054f5ab",
"prodName": "30 Piece Brand New & Sealed Hard Candy' Cosmetics Makeup Excellent Assorted Mixed Lot"
},
{
"_id": "57442700d0fcd01100d45cd5",
"prodName": "8274363XK945021729I5S New Premium zzzzzzz Animals dobermans nature puppies Skin Case Cover Excellent Fitted For iPhone SE/iPhone 5/5s Gary R. Morones's Shop"
},
{
"_id": "575a95fbb9167e100054f5b0",
"prodName": "ACE Fashion Women Professional 15 Color Makeup Cosmetic Contour Concealer Palette Make Up+Sponge+Concealer Brush"
}
]
这是Custom Deserializer
public static class HomeSearchDeserializer implements JsonDeserializer<ArrayList<HomeSearchItems>> {
@Override
public ArrayList<HomeSearchItems> deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws Js
Log.v("JSON RESPONSE " + String.valueOf(countlog++), String.valueOf(json));
Gson gson = new Gson();
Type listType = new TypeToken<ArrayList<HomeSearchItems>>() {
}.getType();
ArrayList<HomeSearchItems> HomeSearchItemsList = new Gson().fromJson(json, listType);
final JsonArray jsonArray = json.getAsJsonArray();
for (int i = 0; i < jsonArray.size(); i++) {
HomeSearchItems homeSearchItems = new HomeSearchItems();
JsonObject jsonObject = jsonArray.get(i).getAsJsonObject();
if (!jsonObject.get("prodName").isJsonNull()) {
homeSearchItems.set_id(jsonObject.get("_id").getAsString());
homeSearchItems.setTitle(jsonObject.get("prodName").getAsString());
homeSearchItems.setType(HomeSearchItems.ItemType.product);
} else if (!jsonObject.get("category").isJsonNull()) {
homeSearchItems.setTitle(jsonObject.get("category").getAsString());
homeSearchItems.setType(HomeSearchItems.ItemType.category);
} else {
homeSearchItems.setTitle(jsonObject.get("keyword").getAsString());
homeSearchItems.setType(HomeSearchItems.ItemType.keyword);
}
HomeSearchItemsList.add(homeSearchItems);
}
return HomeSearchItemsList;
}
}
public static GsonConverterFactory HomeSearchGsonConverter() {
GsonBuilder gsonBuilder = new GsonBuilder();
// Adding custom deserializers
gsonBuilder.registerTypeAdapter(HomeSearchItems.class, new Search.HomeSearchDeserializer());
Gson myGson = gsonBuilder.create();
return GsonConverterFactory.create(myGson);
}
这是改装的GET征集
public interface SearchCalls {
@GET("/products/search")
Call<ArrayList<HomeSearchItems>> HomeSearch(@Header("Authorization") String Token, @Query("queryString") String query);
}
这是我正在进行网络通话的功能
public void callSearch(String query) {
//Toast.makeText(getApplicationContext(),query,Toast.LENGTH_SHORT);
Log.v("query", query);
HttpLoggingInterceptor httpLoggingInterceptor = new HttpLoggingInterceptor();
httpLoggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
OkHttpClient.Builder httpClient = new OkHttpClient.Builder();
httpClient.addInterceptor(new Interceptor() {
@Override
public okhttp3.Response intercept(Chain chain) throws IOException {
Request original = chain.request();
Request request = original.newBuilder()
.header("Content-Type", "application/json")
.method(original.method(), original.body())
.build();
return chain.proceed(request);
}
});
httpClient.addInterceptor(httpLoggingInterceptor);
OkHttpClient client = httpClient.build();
Retrofit retrofit = new Retrofit.Builder()
.baseUrl(baseURL)
.addConverterFactory(HomeSearchGsonConverter())
.client(client)
.build();
Search.SearchCalls service = retrofit.create(Search.SearchCalls.class);
Call<ArrayList<HomeSearchItems>> HomeSearch = service.HomeSearch("Bearer " +appSettings.getToken(),query);
HomeSearch.enqueue(new Callback<ArrayList<HomeSearchItems>>() {
@Override
public void onResponse(Call<ArrayList<HomeSearchItems>> call, Response<ArrayList<HomeSearchItems>> response) {
Log.v("onResponse,Code", String.valueOf(response.code()));
if (response.isSuccessful()) {
HomeSearchItemsList = response.body();
Log.v("onResponse", "isSuccessful TRUE");
} else {
Log.v("onResponse", "isSuccessful FALSE");
}
}
@Override
public void onFailure(Call<ArrayList<HomeSearchItems>> call, Throwable t) {
Log.v("onFailure", t.toString());
}
});
}
其中 HomeSearchItemsList 是Type HomeSearchItems
的ArrayList这是HomeSearchItems类
public class HomeSearchItems {
public enum ItemType {
product, keyword, category
}
private String title;
private ItemType type;
private String _id;
public HomeSearchItems() {
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public ItemType getType() {
return type;
}
public void setType(ItemType type) {
this.type = type;
}
public String get_id() {
return _id;
}
public void set_id(String _id) {
this._id = _id;
}
}
编辑1 STACK TRACE
V/query: a
D/OkHttp: --> GET https://houston.tm.smartfission.com:3030/products/search?queryString=a http/1.1
D/OkHttp: Authorization: Bearer eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJzdWIiOjE2NCwiZXhwIjoxNDczNjY0Mjg5fQ.ROBvKkoC0Gud4AFghYtUku_OXBRYWjzHeR5Dkhd1mOc
D/OkHttp: --> END GET
D/OkHttp: <-- 200 OK https://houston.tm.smartfission.com:3030/products/search?queryString=a (2010ms)
D/OkHttp: X-Powered-By: Express
D/OkHttp: Access-Control-Allow-Origin: *
D/OkHttp: Access-Control-Allow-Methods: GET,PUT,POST,DELETE,PATCH,OPTIONS
D/OkHttp: Access-Control-Allow-Headers: Content-Type, Authorization, Accept-Encoding, Accept-Language
D/OkHttp: Content-Type: application/json; charset=utf-8
D/OkHttp: Content-Length: 891
D/OkHttp: ETag: W/"37b-Qfnf0ExmUd0oo2dJpmXG2g"
D/OkHttp: Vary: Accept-Encoding
D/OkHttp: Date: Fri, 15 Jul 2016 11:02:31 GMT
D/OkHttp: Connection: keep-alive
D/OkHttp: [{"category":"Accessories"},{"category":"Apparel"},{"category":"Audio CD"},{"keyword":"Accessories & Supplies"},{"keyword":"Audio & Video Accessories"},{"keyword":"Combination Deodorants & Antiperspirants"},{"_id":"57442700d0fcd01100d45cd8","prodName":"2015 High-end Case Cover zzzzzzz Animals dobermans nature puppies Samsung Galaxy S7 phone Case 3236386XK945021729S7 Jordan Dowdy's Shop"},{"_id":"575a95fbb9167e100054f5ab","prodName":"30 Piece Brand New & Sealed Hard Candy' Cosmetics Makeup Excellent Assorted Mixed Lot"},{"_id":"57442700d0fcd01100d45cd5","prodName":"8274363XK945021729I5S New Premium zzzzzzz Animals dobermans nature puppies Skin Case Cover Excellent Fitted For iPhone SE/iPhone 5/5s Gary R. Morones's Shop"},{"_id":"575a95fbb9167e100054f5b0","prodName":"ACE Fashion Women Professional 15 Color Makeup Cosmetic Contour Concealer Palette Make Up+Sponge+Concealer Brush"}]
D/OkHttp: <-- END HTTP (891-byte body)
V/onFailure: com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_ARRAY but was BEGIN_OBJECT at path $
编辑2
这一行被抛出：
ArrayList<HomeSearchItems> HomeSearchItemsList = new Gson().fromJson(json, listType);
文档说，
抛出： JsonSyntaxException - 如果json不是typeOfT类型的对象的有效表示
答案 0 :(得分：0)
您的JSON未根据您的要求进行格式化。
以下JSON结构可能适合您 -
[
{
"category": "Accessories",
"keyword": "Accessories & Supplies",
"_id": "57442700d0fcd01100d45cd8",
"prodName": "2015 High-end Case Cover zzzzzzz Animals dobermans nature puppies Samsung Galaxy S7 phone Case 3236386XK945021729S7 Jordan Dowdy's Shop"
},
{
"category": "Apparel",
"keyword": "Audio & Video Accessories",
"_id": "575a95fbb9167e100054f5ab"
"prodName": "30 Piece Brand New & Sealed Hard Candy' Cosmetics Makeup Excellent Assorted Mixed Lot"
}
]
这可能适用于您的数据模型，但您的反序列化程序中有一些很常见的内容，您可能需要再次查看。
请参阅this链接，详细了解如何定义JSON数据。这肯定会有所帮助。