我们的团队决定采用 Retrofit 2.0 ,我正在做一些初步研究。我是这个图书馆的新手。
我想知道如何使用interceptor
在我们的Android应用中通过 Retrofits 2.0 添加自定义标头。关于使用interceptor
在Retrofit 1.X中添加标题有很多tutorials,但由于API在最新版本中发生了很大变化,我不确定如何在新版本中调整这些方法版。此外,Retrofit尚未更新其新文档。
例如,在以下代码中,我应该如何实现Interceptor
类来添加额外的标头?此外,undocumented Chain
object究竟是什么?何时会调用intercept()
?
OkHttpClient client = new OkHttpClient();
client.interceptors().add(new Interceptor() {
@Override
public Response intercept(Chain chain) throws IOException {
Response response = chain.proceed(chain.request());
// How to add extra headers?
return response;
}
});
Retrofit retrofit = new Retrofit.Builder()
.baseUrl(BASE_API_URL)
.client(client)
.addConverterFactory(GsonConverterFactory.create())
.build();
答案 0 :(得分:93)
检查一下。
public class HeaderInterceptor
implements Interceptor {
@Override
public Response intercept(Chain chain)
throws IOException {
Request request = chain.request();
request = request.newBuilder()
.addHeader("appid", "hello")
.addHeader("deviceplatform", "android")
.removeHeader("User-Agent")
.addHeader("User-Agent", "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:38.0) Gecko/20100101 Firefox/38.0")
.build();
Response response = chain.proceed(request);
return response;
}
}
科特林
class HeaderInterceptor : Interceptor {
override fun intercept(chain: Interceptor.Chain): Response = chain.run {
proceed(
request()
.newBuilder()
.addHeader("appid", "hello")
.addHeader("deviceplatform", "android")
.removeHeader("User-Agent")
.addHeader("User-Agent", "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:38.0) Gecko/20100101 Firefox/38.0")
.build()
)
}
}
答案 1 :(得分:18)
public class HeaderInterceptor implements Interceptor {
@Override
public Response intercept(Chain chain) throws IOException {
Request request = chain.request();
request = request.newBuilder()
.addHeader("headerKey0", "HeaderVal0")
.addHeader("headerKey0", "HeaderVal0--NotReplaced/NorUpdated") //new header added
.build();
//alternative
Headers moreHeaders = request.headers().newBuilder()
.add("headerKey1", "HeaderVal1")
.add("headerKey2", "HeaderVal2")
.set("headerKey2", "HeaderVal2--UpdatedHere") // existing header UPDATED if available, else added.
.add("headerKey3", "HeaderKey3")
.add("headerLine4 : headerLine4Val") //line with `:`, spaces doesn't matter.
.removeAll("headerKey3") //Oops, remove this.
.build();
request = request.newBuilder().headers(moreHeaders).build();
/* ##### List of headers ##### */
// headerKey0: HeaderVal0
// headerKey0: HeaderVal0--NotReplaced/NorUpdated
// headerKey1: HeaderVal1
// headerKey2: HeaderVal2--UpdatedHere
// headerLine4: headerLine4Val
Response response = chain.proceed(request);
return response;
}
}
答案 2 :(得分:3)
public class ServiceFactory {
public static ApiClient createService(String authToken, String userName, String password) {
OkHttpClient defaultHttpClient = new OkHttpClient.Builder()
.addInterceptor(
chain -> {
Request request = chain.request().newBuilder()
.headers(getJsonHeader(authToken))
.build();
return chain.proceed(request);
})
.authenticator(getBasicAuthenticator(userName, password))
.build();
return getService(defaultHttpClient);
}
private static Headers getJsonHeader(String authToken) {
Headers.Builder builder = new Headers.Builder();
builder.add("Content-Type", "application/json");
builder.add("Accept", "application/json");
if (authToken != null && !authToken.isEmpty()) {
builder.add("X-MY-Auth", authToken);
}
return builder.build();
}
private static Authenticator getBasicAuthenticator(final String userName, final String password) {
return (route, response) -> {
String credential = Credentials.basic(userName, password);
return response.request().newBuilder().header("Authorization", credential).build();
};
}
private static ApiClient getService(OkHttpClient defaultHttpClient) {
return new Retrofit.Builder()
.baseUrl(BASE_URL)
.addConverterFactory(GsonConverterFactory.create())
.addCallAdapterFactory(RxJavaCallAdapterFactory.create())
.client(defaultHttpClient)
.build()
.create(ApiClient.class);
}
}
答案 3 :(得分:0)
您可以使用Interceptors及其内置方法(如此
)来标题 interceptors().add(new Interceptor() {
@Override
public Response intercept(Chain chain) throws IOException {
Request original = chain.request();
Request.Builder builder = original.newBuilder();
builder.header("Authorization","Bearer "+ LeafPreference.getInstance(context).getString(LeafPreference.TOKEN));
Request request = builder.method(original.method(), original.body())
.build();
Log.e("request",request.urlString());
Log.e("header",request.header("Authorization"));
return chain.proceed(request);
}
});
}