Grails 获取application.yum中配置参数
application.yum配置如下：
map:
request:
key: '12345678123456781234567812345678'
url: 'https://www.baidu.com'
cotroller中获取方式：
def requestURL = grailsApplication.config.getProperty('map.request.url')
def requestKEY = grailsApplication.config.getProperty('map.request.key')