code: public static String merge(String templateContent, VelocityContext context) {
  		final StringWriter writer = new StringWriter();
  		try {
  			Velocity.evaluate(context, writer, IdUtil.randomUUID(), templateContent);
  		} catch (Exception e) {
  			throw new UtilException(e);
  		}
  		return writer.toString();
  	}
docs: 融合模板和内容
  
  @param templateContent 模板的内容字符串
  @param context 上下文
  @return 模板和内容匹配后的内容