code: public SoapClient write(OutputStream out) {
  		try {
  			this.message.writeTo(out);
  		} catch (SOAPException | IOException e) {
  			throw new SoapRuntimeException(e);
  		}
  		return this;
  	}
docs: 将SOAP消息的XML内容输出到流
  
  @param out 输出流
  @return this
  @since 4.5.6