http://blog.csdn.net/u010515761/article/details/43225621

http://stackoverflow.com/questions/74674/how-to-do-i-check-cpu-and-memory-usage-in-java

http://stackoverflow.com/questions/25552/get-os-level-system-information

http://www.javaworld.com/article/2077361/learn-java/profiling-cpu-usage-from-within-a-java-application.html

http://stackoverflow.com/questions/47177/how-to-monitor-the-computers-cpu-memory-and-disk-usage-in-java

获取cpu使用率