”Cache-Control”，“max-age=time”

”Cache-Control”，“max-age=3600*24”

public class CacheInterceptor implements Interceptor {
  @Override
  public Response intercept(Chain chain) throws IOException {
    Request request = chain.request();
    Response response = chain.proceed(request);
    String cache = request.header("Cache-Time");
    if (!Util.checkNULL(cache)) {//缓存时间不为空
      Response response1 = response.newBuilder()
          .removeHeader("Pragma")
          .removeHeader("Cache-Control")
          //cache for cache seconds
          .header("Cache-Control", "max-age="+cache)
          .build();
      return response1;
    } else {
      return response;
    }
  }
}

public class CacheProvide {
  Context mContext;

  public CacheProvide(Context context) {
    mContext = context;
  }

  public Cache provideCache() {//使用应用缓存文件路径，缓存大小为10MB
    return new Cache(mContext.getCacheDir(), 10240 * 1024);
  }
}

 OkHttpClient client = new OkHttpClient.Builder()
          .addNetworkInterceptor(new CacheInterceptor())//缓存拦截器
          .cache(new CacheProvide(mAppliactionContext).provideCache())//缓存空间提供器
          .connectTimeout(8, TimeUnit.SECONDS)
          .readTimeout(5, TimeUnit.SECONDS)
          .writeTimeout(5, TimeUnit.SECONDS)
          .build();