接上一篇的下面提供另一种实现方式：
先看一个类图：
JDK实现了九个自带的MBean，这些MBean能够监视虚拟机的所有信息：分别是如下
ManagementFactory工厂类通过ObjectName可以获取对应的MBean实例，自然就可以获取想要的数据了
2 代码如下：
package pyc.jvm.monitor;
import java.io.IOException;
import java.lang.management.ClassLoadingMXBean;
import java.lang.management.ManagementFactory;
import java.lang.management.MemoryMXBean;
import java.lang.management.MemoryUsage;
import java.lang.management.OperatingSystemMXBean;
import java.lang.management.ThreadMXBean;
import java.net.MalformedURLException;
import java.util.Timer;
import java.util.TimerTask;
import java.util.concurrent.TimeUnit;
import javax.management.AttributeNotFoundException;
import javax.management.InstanceNotFoundException;
import javax.management.MBeanException;
import javax.management.MBeanServerConnection;
import javax.management.ReflectionException;
import javax.management.remote.JMXConnector;
import javax.management.remote.JMXConnectorFactory;
import javax.management.remote.JMXServiceURL;
/**
* 创建时间：2014-11-7 上午11:06:34
*
* @author zhangtianyou
* @version 2.2
*/
public class JMXTest2 {
private final static String SERVICE_1 = "service:jmx:rmi:///jndi/rmi://192.168.85.54:8787/jmxrmi";
/**
* @param args
*/
public static void main(String[] args) {
//10秒调用一次
Timer timer = new Timer();
timer.schedule(new JMXTest2(). new MonitorTask(SERVICE_1), 0, 10000);
}
private class MonitorTask extends TimerTask{
private String service;
public MonitorTask(String service){
this.service = service;
}
@Override
public void run() {
JMXmonitor(service);
}
}
private static void JMXmonitor(String service) {
JMXConnector jmxConnector = null;
try {
JMXServiceURL ServiceURL = new JMXServiceURL(service);
jmxConnector = JMXConnectorFactory.connect(ServiceURL);
// MBean 服务器（无论是本地的还是远程的）进行通信的一种方式 MBeanServerConnection
MBeanServerConnection mBeanServerConnection = jmxConnector
.getMBeanServerConnection();
// 获取MemoryMXBean
System.out.println("\nMemory");
MemoryMXBean memoryMXBean = ManagementFactory
.newPlatformMXBeanProxy(mBeanServerConnection,
ManagementFactory.MEMORY_MXBEAN_NAME,
MemoryMXBean.class);
MemoryUsage heapMemoryUsage = memoryMXBean.getHeapMemoryUsage();
System.out.println("heapMemoryUsage :");
System.out.println("committed = "
+ convertKB(heapMemoryUsage.getCommitted()));
System.out
.println("init = " + convertKB(heapMemoryUsage.getInit()));
System.out.println("max = " + convertKB(heapMemoryUsage.getMax()));
System.out
.println("used = " + convertKB(heapMemoryUsage.getUsed()));
MemoryUsage nonHeapMemoryUsage = memoryMXBean
.getNonHeapMemoryUsage();
System.out.println("\nnonHeapMemoryUsage :");
System.out.println("committed = "
+ convertKB(nonHeapMemoryUsage.getCommitted()));
System.out.println("init = "
+ convertKB(nonHeapMemoryUsage.getInit()));
System.out.println("max = "
+ convertKB(nonHeapMemoryUsage.getMax()));
System.out.println("used = "
+ convertKB(nonHeapMemoryUsage.getUsed()));
// 获取 ThreadMXBean
System.out.println("\nThread");
ThreadMXBean threadMXBean = ManagementFactory
.newPlatformMXBeanProxy(mBeanServerConnection,
ManagementFactory.THREAD_MXBEAN_NAME,
ThreadMXBean.class);
System.out
.println("ThreadCount = " + threadMXBean.getThreadCount());
System.out.println("DaemonThreadCount = "
+ threadMXBean.getDaemonThreadCount());
System.out.println("PeakThreadCount = "
+ threadMXBean.getPeakThreadCount());
System.out.println("CurrentThreadCpuTime = "
+ threadMXBean.getCurrentThreadCpuTime());
System.out.println("CurrentThreadUserTime = "
+ threadMXBean.getCurrentThreadUserTime());
System.out.println("\nClassLoading");
ClassLoadingMXBean classLoadingMXBean = ManagementFactory
.newPlatformMXBeanProxy(mBeanServerConnection,
ManagementFactory.CLASS_LOADING_MXBEAN_NAME,
ClassLoadingMXBean.class);
// 当前加载到Java虚拟机中类的数量
System.out.println("LoadedClassCount = "
+ classLoadingMXBean.getLoadedClassCount());
// Java 虚拟机开始执行到目前已经加载的类的总数。
System.out.println("TotalLoadedClassCount = "
+ classLoadingMXBean.getTotalLoadedClassCount());
// Java 虚拟机开始执行到目前已经卸载的类的总数。
System.out.println("UnloadedClassCount = "
+ classLoadingMXBean.getUnloadedClassCount());
System.out.println("\nCpu");
OperatingSystemMXBean operatingSystemMXBean = ManagementFactory
.newPlatformMXBeanProxy(mBeanServerConnection,
ManagementFactory.OPERATING_SYSTEM_MXBEAN_NAME,
OperatingSystemMXBean.class);
System.out.println("AvailableProcessors = "
+ operatingSystemMXBean.getAvailableProcessors());
double ratio = 0.0;
long start = System.currentTimeMillis();
long startC;
try {
startC = (long) mBeanServerConnection.getAttribute(operatingSystemMXBean.getObjectName(), "ProcessCpuTime");
try {
TimeUnit.SECONDS.sleep(5);
} catch (InterruptedException e) {
e.printStackTrace();
}
long end = System.currentTimeMillis();
long endC = (long) mBeanServerConnection.getAttribute(operatingSystemMXBean.getObjectName(), "ProcessCpuTime");
int availableProcessors = operatingSystemMXBean.getAvailableProcessors();
ratio = (endC-startC) / 1000000.0 / (end-start) / availableProcessors;
} catch (AttributeNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (InstanceNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (MBeanException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (ReflectionException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
System.out.println("CUP使用率" + ratio * 100 + "%");
} catch (MalformedURLException e) {
e.printStackTrace();
System.out.println("非法的ServiceURL");
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (jmxConnector != null) {
jmxConnector.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
private static String convertKB(long src) {
if (src <= 0L) {
return "0KB";
}
return (double) src / 1024 + "KB";
}
}
3 运行效果如下：
Memory heapMemoryUsage : committed = 59392.0KB init = 63667.75KB max = 906752.0KB used = 21645.8046875KB nonHeapMemoryUsage : committed = 30144.0KB init = 24000.0KB max = 133120.0KB used = 17608.9921875KB Thread ThreadCount = 53 DaemonThreadCount = 52 PeakThreadCount = 56 CurrentThreadCpuTime = 0 CurrentThreadUserTime = 0 ClassLoading LoadedClassCount = 2526 TotalLoadedClassCount = 2581 UnloadedClassCount = 55 Cpu AvailableProcessors = 4 CUP使用率0.07790701158609668%
原文地址：http://blog.csdn.net/fengshizty/article/details/40894785
