retrofit 实现打印请求 log 日志

使用retrofit 打印出网络请求日志，包括请求urll、返回内容等。要实现打印日志，就要用到HttpLoggingInterceptor这个类。 

build.gradle 导入

compile 'com.squareup.okhttp3:okhttp:3.+'
compile 'com.squareup.okio:okio:1.+'
compile 'com.squareup.okhttp3:logging-interceptor:3.+'
compile 'com.squareup.retrofit2:retrofit:2.1.0'
compile 'com.squareup.retrofit2:adapter-rxjava:2.1.0'
compile 'com.squareup.retrofit2:converter-gson:2.1.0'

主要导入的是compile 'com.squareup.okhttp3:logging-interceptor:3.+' 

初始化okhttp

private static void initOkHttp() {
    OkHttpClient.Builder builder = new OkHttpClient.Builder();
    if (BuildConfig.DEBUG) {
        // https://drakeet.me/retrofit-2-0-okhttp-3-0-config
        HttpLoggingInterceptor loggingInterceptor =new HttpLoggingInterceptor();
        loggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BASIC);
        builder.addInterceptor(loggingInterceptor);
    }
    // http://www.jianshu.com/p/93153b34310e
    File cacheFile = new File(Constants.PATH_CACHE);
    Cache cache = new Cache(cacheFile, 1024 * 1024 * 50);
    Interceptor cacheInterceptor = new Interceptor() {
        @Override
        public Response intercept(Chain chain) throws IOException{
            Request request = chain.request();
            if (!NETworkUtils.isConnected(MyApp.getInstance().getApplicationContext())){
                request = request.newBuilder()
                        .cacheControl(CacheControl.FORCE_CACHE)
                        .build();
            }
            Response response = chain.proceed(request);
            if (NETworkUtils.isFastMobileNetwork(MyApp.getInstance().getApplicationContext())){
                int maxAge = 0;
                // 有网络时,不缓存,最大保存时长为0
                response.newBuilder()
                   .header("Cache-Control","public,max-age="+maxAge)
                   .removeHeader("Pragma")
                   .build();
            } else {
                // 无网络时，设置超时为4周
                int maxStale = 60 * 60 * 24 * 28;
                response.newBuilder()
                   .header("Cache-Control", "public,only-if-cached, max-stale="+maxStale)
                   .removeHeader("Pragma")
                   .build();
            }
            return response;

        }

    };

    //设置缓存

    builder.addNetworkInterceptor(cacheInterceptor);

    builder.addInterceptor(cacheInterceptor);

    builder.cache(cache);

    //设置超时

    builder.connectTimeout(10, TimeUnit.SECONDS);

    builder.readTimeout(20, TimeUnit.SECONDS);

    builder.writeTimeout(20, TimeUnit.SECONDS);

    //错误重连

    builder.retryOnConnectionFailure(true);

    okHttpClient = builder.build();

}

配置 retrofit

Retrofit fpRetrofit = new Retrofit.Builder()

        .baseUrl(FPApis.HOST)

        .client(okHttpClient)

        .addConverterFactory(GsonConverterFactory.create())

        .addCallAdapterFactory(RxJavaCallAdapterFactory.create())

        .build();

日志级别

loggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BASIC);

除了 BASIC 级别外，还有 NONE、HEADERS、BODY。

• NONE 

    没有任何 log。

• HEADERS

    请求/响应行 + 头

• BODY

    请求/响应行 + 头 + 体

• BASIC

    请求/响应行