持久化cookie之前，我们最好了解一下cookie是怎么传输的，看完之后我想你就能使用很简单的方式去保持cookie了。

/**

 * This interceptor put all the Cookies in Preferences in the Request.

 * Your implementation on how to get the Preferences MAY VARY.

 * <p>

 * Created by tsuharesu on 4/1/15.

 */

public class AddCookiesInterceptor implements Interceptor {

    @Override

    public Response intercept(Chain chain) throws IOException {

        Request.Builder builder = chain.request().newBuilder();

        HashSet<String> preferences = (HashSet) Preferences.getDefaultPreferences().getStringSet(Preferences.PREF_COOKIES, new HashSet<>());

        for (String cookie : preferences) {

            builder.addHeader("Cookie", cookie);

            Log.v("OkHttp", "Adding Header: " + cookie); // This is done so I know which headers are being added; this interceptor is used after the normal logging of OkHttp

        }

        return chain.proceed(builder.build());

    }

}

/**

 * This Interceptor add all received Cookies to the app DefaultPreferences.

 * Your implementation on how to save the Cookies on the Preferences MAY VARY.

 * <p>

 * Created by tsuharesu on 4/1/15.

 */

public class ReceivedCookiesInterceptor implements Interceptor {

    @Override

    public Response intercept(Chain chain) throws IOException {

        Response originalResponse = chain.proceed(chain.request());

        if (!originalResponse.headers("Set-Cookie").isEmpty()) {

            HashSet<String> cookies = new HashSet<>();

            for (String header : originalResponse.headers("Set-Cookie")) {

              cookies.add(header);

            }

            Preferences.getDefaultPreferences().edit()

                    .putStringSet(Preferences.PREF_COOKIES, cookies)

                    .apply();

        }

        return originalResponse;

    }

}

/**

 * Somewhere you create a new OkHttpClient and use it on all your requests.

 */

OkHttpClient okHttpClient = new OkHttpClient();

okHttpClient.interceptors().add(new AddCookiesInterceptor());

okHttpClient.interceptors().add(new ReceivedCookiesInterceptor());