要求对服务器的heap内存进行监控，下面是可用的代码。如果不能连接jmx端口，检查hostname是否映射为外网IP，或者看我之前关于jconsole一篇笔记。
public class Test {
public static void main(String[] args) throws Exception { JMXServiceURL url = new JMXServiceURL("smxrmi"); JMXConnector jmxc = JMXConnectorFactory.connect(url, null); MBeanServerConnection mbsc = jmxc.getMBeanServerConnection(); ObjectName mbeanName = new ObjectName("java.lang:type=Memory"); System.out.println("Name = " + mbsc.getAttribute(mbeanName, "HeapMemoryUsage"));// 取值 CompositeDataSupport cds = (CompositeDataSupport)mbsc.getAttribute(mbeanName, "HeapMemoryUsage"); MemoryUsage heapMemoryUsage = MemoryUsage.from(cds); System.out.println(heapMemoryUsage.getUsed()); System.out.println(heapMemoryUsage.getInit()); System.out.println(heapMemoryUsage.getMax()); System.out.println(heapMemoryUsage.getCommitted()); jmxc.close(); } }
不自己实现代码更好的方式，.zip，这个jar对jmx查询进行了封装，可以配合nagios进行告警。
--heipark
