public E attachments(File[] attachments) {
        for (File file : attachments) {
            addBinaryAttachment(file);
        }
        return getThis();
    }
public E attachments ( File [ ] attachments ) { for ( File file : attachments ) { addBinaryAttachment ( file ) ; } return getThis ( ) ; }
添加附件。附件名默认使用文件名

@param attachments 附件列表
@return