spring @Scheduled 并发执行

spring @Scheduled ，默认基于单线程执行，如果需要基于多线程执行，需要在配置文件中配置如下 

 <task:scheduler id="scheduler" pool-size="10" />
<task:executor id="executor" keep-alive="7200" pool-size="100-200"
queue-capacity="500" rejection-policy="CALLER_RUNS" />
<task:annotation-driven executor="executor"
scheduler="scheduler" />

具体可以参考spring 帮助文档对annotation-driven的executor和scheduler的解释