參考：原文地址
1.可以遍歷formBody，迴圈新增 formBody

2.最好的辦法是重寫 FormBody，追加新增引數的方法。

            OkHttpClient.Builder httpClient = new OkHttpClient.Builder()
            httpClient.addInterceptor(new Interceptor() {
        @Override
        public Response intercept(Chain chain) throws IOException {
            Request original = chain.request();
            //請求定製：新增請求頭
            Request.Builder requestBuilder = original.newBuilder()
                    .header("APIKEY", Constant.API_KEY);

            //請求體定製：統一新增token引數
            if(original.body() instanceof FormBody){
                FormBody.Builder newFormBody = new FormBody.Builder();
                FormBody oidFormBody = (FormBody) original.body();
                for (int i = 0;i<oidFormBody.size();i++){
                    newFormBody.addEncoded(oidFormBody.encodedName(i),oidFormBody.encodedValue(i));
                }
                newFormBody.add("token",Constant.API_TOKEN);
                requestBuilder.method(original.method(),newFormBody.build());
            }

            Request request = requestBuilder.build();
            return chain.proceed(request);
        }
    });
 

特需字元
base64加密，那麼去掉字元
參考文章：參考地址