Spring中管理的所有Bean默認(rèn)都是singleton的
<bean id="command" class="fiona.apple.AsyncCommand" />

如果想將Bean配置成非單例的,可以通過配置scope來說明
<!-- a stateful bean deployed as a prototype (non-singleton) -->
<bean id="command" class="fiona.apple.AsyncCommand" scope="prototype"/>
這樣每次獲取AsyncCommand對(duì)象是都會(huì)創(chuàng)建一個(gè)新的對(duì)象