okhttp配置缓存拦截器

最新推荐文章于 2022-06-24 23:06:32 发布

原创最新推荐文章于 2022-06-24 23:06:32 发布 · 318 阅读

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CC 4.0 BY-SA版权

本文介绍两个OkHttp拦截器的实现方式：REWRITE_RESPONSE_INTERCEPTOR用于在线情况下修改响应缓存控制策略；REWRITE_RESPONSE_INTERCEPTOR_OFFLINE用于离线情况下强制使用缓存。

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public static  final Interceptor REWRITE_RESPONSE_INTERCEPTOR = new Interceptor() {
        @Override
        public okhttp3.Response intercept(Chain chain) throws IOException {
            okhttp3.Response originalResponse = chain.proceed(chain.request());
            String cacheControl = originalResponse.header("Cache-Control");
            if (cacheControl == null || cacheControl.contains("no-store") || cacheControl.contains("no-cache") ||
                    cacheControl.contains("must-revalidate") || cacheControl.contains("max-age=0")) {
               int max_age=60*5;
                return originalResponse.newBuilder()
                        .removeHeader("Pragma")
                        .header("Cache-Control", "public, max-age=" + max_age)
                        .build();
            } else {
                return originalResponse;
            }
        }
    };

    public static Interceptor REWRITE_RESPONSE_INTERCEPTOR_OFFLINE = new Interceptor() {
        @Override
        public okhttp3.Response intercept(Chain chain) throws IOException {
            Request request = chain.request();
            if (!NetworkUtils.isConnected()) {
//                int maxStale = 60 * 60 * 24 * 28;
//                request = request.newBuilder()
//                        .removeHeader("Pragma")
//                        .header("Cache-Control", "public, only-if-cached,max-stale=" + maxStale)
//                        .build();
                request = request.newBuilder()
                        .removeHeader("Pragma")
                        .cacheControl(CacheControl.FORCE_CACHE)
                        .build();
            }
            return chain.proceed(request);
        }
    };