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android - 使用 Retrofit 2.0.x 进行 HTTP 缓存

转载 作者:IT老高 更新时间:2023-10-28 23:22:17 25 4
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我正在尝试使用 Retrofit 2.0 在我的应用中缓存一些响应,但我遗漏了一些东西。

我安装了一个缓存文件如下:

private static File httpCacheDir;
private static Cache cache;
try {
httpCacheDir = new File(getApplicationContext().getCacheDir(), "http");
httpCacheDir.setReadable(true);
long httpCacheSize = 10 * 1024 * 1024; // 10 MiB
HttpResponseCache.install(httpCacheDir, httpCacheSize);
cache = new Cache(httpCacheDir, httpCacheSize);
Log.i("HTTP Caching", "HTTP response cache installation success");
} catch (IOException e) {
Log.i("HTTP Caching", "HTTP response cache installation failed:" + e);
}

public static Cache getCache() {
return cache;
}

/data/user/0/<PackageNmae>/cache/http 中创建一个文件,然后准备一个网络拦截器如下:

public class CachingControlInterceptor implements Interceptor {
@Override
public Response intercept(Chain chain) throws IOException {
Request request = chain.request();

// Add Cache Control only for GET methods
if (request.method().equals("GET")) {
if (ConnectivityUtil.checkConnectivity(getContext())) {
// 1 day
request.newBuilder()
.header("Cache-Control", "only-if-cached")
.build();
} else {
// 4 weeks stale
request.newBuilder()
.header("Cache-Control", "public, max-stale=2419200")
.build();
}
}

Response originalResponse = chain.proceed(chain.request());
return originalResponse.newBuilder()
.header("Cache-Control", "max-age=86400")
.build();
}
}

我的 RetrofitOkHttpClient实例:

OkHttpClient client = new OkHttpClient();
client.setCache(getCache());
client.interceptors().add(new MainInterceptor());
client.interceptors().add(new LoggingInceptor());
client.networkInterceptors().add(new CachingControlInterceptor());
Retrofit restAdapter = new Retrofit.Builder()
.client(client)
.baseUrl(Constants.BASE_URL)
.addConverterFactory(GsonConverterFactory.create(gson))
.build();

productsService = restAdapter.create(ProductsService.class);

在哪里 ProductsService.class包含:

@Headers("Cache-Control: max-age=86400")
@GET("categories/")
Call<PagedResponse<Category>> listCategories();

Call<PagedResponse<Category>> call = getRestClient().getProductsService().listCategories();
call.enqueue(new GenericCallback<PagedResponse<Category>>() {
// whatever
// GenericCallback<T> implements Callback<T>
}
});

这里的问题是:如何让它在设备离线时访问缓存的响应?

后端响应的 header 是:

Allow → GET, HEAD, OPTIONS
Cache-Control → max-age=86400, must-revalidate
Connection → keep-alive
Content-Encoding → gzip
Content-Language → en
Content-Type → application/json; charset=utf-8
Date → Thu, 17 Dec 2015 09:42:49 GMT
Server → nginx
Transfer-Encoding → chunked
Vary → Accept-Encoding, Cookie, Accept-Language
X-Frame-Options → SAMEORIGIN
x-content-type-options → nosniff
x-xss-protection → 1; mode=block

最佳答案

我终于得到了答案。

网络拦截器应该如下:

public class CachingControlInterceptor implements Interceptor {
@Override
public Response intercept(Chain chain) throws IOException {
Request request = chain.request();

// Add Cache Control only for GET methods
if (request.method().equals("GET")) {
if (ConnectivityUtil.checkConnectivity(YaootaApplication.getContext())) {
// 1 day
request = request.newBuilder()
.header("Cache-Control", "only-if-cached")
.build();
} else {
// 4 weeks stale
request = request.newBuilder()
.header("Cache-Control", "public, max-stale=2419200")
.build();
}
}

Response originalResponse = chain.proceed(request);
return originalResponse.newBuilder()
.header("Cache-Control", "max-age=600")
.build();
}
}

那么安装缓存文件就这么简单

long SIZE_OF_CACHE = 10 * 1024 * 1024; // 10 MiB
Cache cache = new Cache(new File(context.getCacheDir(), "http"), SIZE_OF_CACHE);
OkHttpClient client = new OkHttpClient();
client.cache(cache);
client.networkInterceptors().add(new CachingControlInterceptor());

关于android - 使用 Retrofit 2.0.x 进行 HTTP 缓存,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/34311058/

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