http://www.itzhai.com/the-executorservice-common-method-newfixedthreadpool-of-create-fixed-size-thread-pool.html
http://tutorials.jenkov.com/java-util-concurrent/executorservice.html
ExecutorService 线程池,布布扣,bubuko.com
ExecutorService 线程池
原文：http://www.cnblogs.com/alexfan/p/3569211.html
