code: public SoapClient setCharset(Charset charset) {
  		this.charset = charset;
  		try {
  			this.message.setProperty(SOAPMessage.CHARACTER_SET_ENCODING, this.charset.toString());
  			this.message.setProperty(SOAPMessage.WRITE_XML_DECLARATION, "true");
  		} catch (SOAPException e) {
  			// ignore
  		}
  		
  		return this;
  	}
docs: 设置编码
  
  @param charset 编码
  @return this