code: private String getFieldName(String contentDisposition) {
  		String fieldName = null;
  
  		if (contentDisposition != null && contentDisposition.toLowerCase().startsWith(FORM_DATA)) {
  			ParameterParser parser = new ParameterParser();
  			parser.setLowerCaseNames(true);
  
  			// parameter parser can handle null input
  			Map<String,String> params = parser.parse(contentDisposition, ';');
  			fieldName = (String) params.get("name");
  			if (fieldName != null) {
  				fieldName = fieldName.trim();
  			}
  		}
  
  		return fieldName;
  	}
docs: Retrieves the name of the field from the Content-Disposition header of the part.
  
  @param contentDisposition the value of the Content-Disposition header.
  
  @return a String object that holds the name of the field to which this part is associated.