Android(安卓)Retrofit OkHttp添加Interceptor拦截器设置POST请求公共参数

private HttpServiceImpl() {    OkHttpClient httpClient = new OkHttpClient.Builder()            .connectTimeout(CONNECT_TIMEOUT, TimeUnit.SECONDS)            // 对请求进行拦截处理，添加统一的请求头及打印请求报文和返回报文            .addInterceptor(new Interceptor() {                @Override                public Response intercept(Chain chain) throws IOException {                    Request request = chain.request();                    if ("POST".equals(request.method())) {                        if (request.body() instanceof FormBody) {                            FormBody.Builder bodyBuilder = new FormBody.Builder();                            FormBody formBody = (FormBody) request.body();                            // 先复制原来的参数                            for (int i = 0; i < formBody.size(); i++) {                                bodyBuilder.addEncoded(formBody.encodedName(i), formBody.encodedValue(i));                            }                            // 添加公共参数                            formBody = bodyBuilder                                    .addEncoded("version", "1.0.0")                                    .addEncoded("appkey", "yeyuanxinyi")                                    .addEncoded("timestamp", String.valueOf(System.currentTimeMillis()))                                    .build();                            request = request.newBuilder().post(formBody).build();                        }                    }                    return chain.proceed(request);                }            })            .build();    return new Retrofit.Builder()            .client(httpClient)            .addConverterFactory(GsonConverterFactory.create())            .addCallAdapterFactory(RxJava2CallAdapterFactory.create())            .baseUrl(getBaseUrl())            .build();}

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