weixin4j本身不依赖http工具包,会根据当前的环境检测确定使用哪个HttpClient,具体顺序是:

NettyHttpClient -> ApacheHttpClient -> OkHttpClient -> SimpleHttpClient(HttpURLConnection)

基于netty实现的http客户端

基于apache的http工具包,支持commons-httpclient3.x和httpclient4.x

基于square的OKHttp工具包,支持OkHttp2和OkHttp3

基于jdk提供的HttpURLConnection实现的http客户端

HttpClientFactory.setDefaultFactory(HttpClientFactory);

HttpClientFactory.setDefaultParams(HttpParams);