Android(安卓)Retrofit2&OkHttp3添加统一的请求头Header

在使用Retrofit时，有时候需要设置Set-Cookie等请求头，如果每一个url都需要，那么直接来个拦截器就好了。

官方说明：

OkHttp3下OkHttpClient的 List< Interceptor> interceptors()方法，返回的是一个不可编辑的列表，如果对其进行编辑会报出UnSupportedOperationException

Interceptor的典型使用场景，就是对request和response的Headers进行编辑

如下图所示：

注意Header头，不要照抄，要灵活运用。

让所有网络请求都附上你的 token：

Interceptor mTokenInterceptor = new Interceptor() {    @Override public Response intercept(Chain chain) throws IOException {        Request originalRequest = chain.request();        if (Your.sToken == null || alreadyHasAuthorizationHeader(originalRequest)) {            return chain.proceed(originalRequest);        }        Request authorised = originalRequest.newBuilder()            .header("Authorization", Your.sToken)            .build();        return chain.proceed(authorised);    }};

为OkHttpClient 添加两个以上的拦截器，如下代码所示：

public class RestDataSource implements Repository {    private final MarvelService mMarvelService;    @Inject    public RestDataSource() {        // Log信息        HttpLoggingInterceptor loggingInterceptor = new HttpLoggingInterceptor();        loggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BASIC);        // 公私密匙        MarvelSigningInterceptor signingInterceptor = new MarvelSigningInterceptor(                BuildConfig.MARVEL_PUBLIC_KEY, BuildConfig.MARVEL_PRIVATE_KEY);        // OkHttp3.0的使用方式        OkHttpClient client = new OkHttpClient.Builder()                .addInterceptor(signingInterceptor)                .addInterceptor(loggingInterceptor)                .build();        // 选择人物信息        Gson customGsonInstance = new GsonBuilder()                .registerTypeAdapter(new TypeToken<List<AvengersCharacter>>() {                        }.getType(),                        new MarvelResultsDeserializer<AvengersCharacter>())                .create();        // 适配器        Retrofit marvelApiAdapter = new Retrofit.Builder()                .baseUrl(MarvelService.END_POINT)                .addConverterFactory(GsonConverterFactory.create(customGsonInstance))                .addCallAdapterFactory(RxJavaCallAdapterFactory.create())                .client(client)                .build();        // 服务        mMarvelService = marvelApiAdapter.create(MarvelService.class);    }    // 返回人物信息    @Override    public Observable<List<AvengersCharacter>> getCharacters(int currentOffset) {        return mMarvelService.getCharacters(currentOffset);    }}

下面来个完整的配置：

import okhttp3.Interceptor;import okhttp3.OkHttpClient;import okhttp3.Request;import okhttp3.Response;import retrofit2.Retrofit;public class RetrofitAPIManager {    public static final String SERVER_URL = "url";    public static ClientAPI provideClientApi() {        Retrofit retrofit = new Retrofit.Builder()                .baseUrl(SERVER_URL)                .client(genericClient())                .build();        return retrofit.create(ClientAPI.class);    }    public static OkHttpClient genericClient() {        OkHttpClient httpClient = new OkHttpClient.Builder()                .addInterceptor(new Interceptor() {                    @Override                    public Response intercept(Chain chain) throws IOException {                        Request request = chain.request()                                .newBuilder()                                .addHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8")                                .addHeader("Accept-Encoding", "gzip, deflate")                                .addHeader("Connection", "keep-alive")                                .addHeader("Accept", "*/*")                                .addHeader("Cookie", "add cookies here")                                .build();                        return chain.proceed(request);                    }                })                .build();        return httpClient;    }}

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