code: public static X509TrustManager chooseTrustManager(TrustManager[] trustManagers) {
  		for (TrustManager trustManager : trustManagers) {
  			if (trustManager instanceof X509TrustManager) {
  				return (X509TrustManager) trustManager;
  			}
  		}
  		return null;
  	}
docs: 选择指定格式的证书管理器
  
  @param trustManagers
  @return