在JAVA 7中，可以使用OperatingSystemMXBean类对系统和CPU负载情况进行监控

方法如下：

import com.sun.management.OperatingSystemMXBean;
...
OperatingSystemMXBean osBean = ManagementFactory.getPlatformMXBean(OperatingSystemMXBean.class);
// What % CPU load this current JVM is taking, from 0.0-1.0
System.out.println(osBean.getProcessCpuLoad());//指CPU的负载情况

// What % load the overall system is at, from 0.0-1.0
System.out.println(osBean.getSystemCpuLoad());//指系统的负载情况

注意：getSystemLoadAverage()在JAVA 6也有，但可惜的是在WINDOWS上运行的并不好

参考 http://blog.csdn.net/jackyrongvip/article/details/6646358

Java中的CPU和系统负载监控——OperatingSystemMXBean