使用jmx和java以编程方式获取堆信息

import javax.management.*;
import javax.management.remote.*;
import java.io.IOException;
import java.util.Set;

JMXServiceURL url = new JMXServiceURL("service:jmx:rmi:///jndi/rmi://<hostname>:<port>/jmxrmi");
JMXConnector connector = JMXConnectorFactory.connect(url, null);

MBeanServerConnection mbsc = connector.getMBeanServerConnection();

ObjectName objectName = new ObjectName("java.lang:type=Memory");
AttributeList attributes = mbsc.getAttributes(objectName, new String[]{"HeapMemoryUsage"});
CompositeData heapMemoryUsage = (CompositeData) attributes.get(0).getValue();
long used = (Long) heapMemoryUsage.get("used");
long max = (Long) heapMemoryUsage.get("max");