JMX之通过RMI方式连接JMX Server

除了可以在HTML中管理MBean之外，我们还可以通过程序来连接JMX管理MBean。这就需要用到了JMX的Connectior，JMX提供了两种Connector：RMI Connector和JMXMP Connector（JMX message protocol Connector）。下面介绍RMI Connector。

首先还是要创建MBean接口和实现

package com.jmx.client;public interface HelloMBean {public String getName();public void setName(String name);public void helloWorld();public void helloWorld(String name);public String getTelephone();}

package com.jmx.client;public interface HelloMBean {public String getName();public void setName(String name);public void helloWorld();public void helloWorld(String name);public String getTelephone();}

创建JMXServer和JMXConnectorServer（通过RMI注册URL提供客户端连接）

package com.jmx.client;import java.io.IOException;import java.lang.management.ManagementFactory;import java.net.MalformedURLException;import java.rmi.registry.LocateRegistry;import javax.management.InstanceAlreadyExistsException;import javax.management.MBeanRegistrationException;import javax.management.MBeanServer;import javax.management.MalformedObjectNameException;import javax.management.NotCompliantMBeanException;import javax.management.ObjectName;import javax.management.remote.JMXConnectorServer;import javax.management.remote.JMXConnectorServerFactory;import javax.management.remote.JMXServiceURL;import com.sun.jdmk.comm.HtmlAdaptorServer;public class HelloAgent {public static void main(String[] args) throws MalformedObjectNameException, NullPointerException, InstanceAlreadyExistsException, MBeanRegistrationException, NotCompliantMBeanException {//create mbean serverMBeanServer server = ManagementFactory.getPlatformMBeanServer();//create object nameObjectName helloName = new ObjectName("jmxBean:name=hello");//create mbean and register mbeanserver.registerMBean(new Hello(), helloName);//create adaptor, adaptor is just a form as show mbean. It has no relation to specific mbean.HtmlAdaptorServer adaptor  = new HtmlAdaptorServer();//create adaptor nameObjectName adaptorName = new ObjectName("jmxAdaptor:name=adaptor,port=5050");//register adaptor and adaptor nameserver.registerMBean(adaptor, adaptorName);adaptor.setPort(9999);adaptor.start();System.out.println("....................server start....................");//JMXConnectorServer service try {//这句话非常重要，不能缺少！注册一个端口，绑定url后，客户端就可以使用rmi通过url方式来连接JMXConnectorServerLocateRegistry.createRegistry(8888);JMXServiceURL url = new JMXServiceURL("service:jmx:rmi:///jndi/rmi://localhost:8888/server");JMXConnectorServer cs = JMXConnectorServerFactory.newJMXConnectorServer(url, null, server);System.out.println("....................begin rmi start.....");cs.start();System.out.println("....................rmi start....."); } catch (MalformedURLException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}   }}

这里的8888（默认为1099）是通讯端口或者查找端口，服务端在createRegistry时实际上会new ServerSocket(8888),客户端的socket通过与端口号为8888的服务端端口互联lookup到server对象。客户端获取到的server对象在和服务端的sketon对象进行通讯时实际上也会建立socket连接，数据传输时的ServerSocket也需要一个端口(不同于通讯端口)，称之为数据端口。

创建客户端代码远程连接JMXConnectorServer操作MBean

package com.jmx.client;import java.util.Iterator;import java.util.Set;import javax.management.Attribute;import javax.management.MBeanInfo;import javax.management.MBeanServerConnection;import javax.management.MBeanServerInvocationHandler;import javax.management.ObjectInstance;import javax.management.ObjectName;import javax.management.remote.JMXConnector;import javax.management.remote.JMXConnectorFactory;import javax.management.remote.JMXServiceURL;import com.jmx.demo.HelloMBean;public class Client {   public static void main(String[] args) throws Exception {//connect JMXJMXServiceURL url = new JMXServiceURL("service:jmx:rmi:///jndi/rmi://localhost:8888/server");JMXConnector jmxc = JMXConnectorFactory.connect(url,null);MBeanServerConnection mbsc = jmxc.getMBeanServerConnection();     ObjectName mbeanName = new ObjectName("jmxBean:name=hello");   //print domainsSystem.out.println("Domains:---------------");String domains[] = mbsc.getDomains();for (int i = 0; i < domains.length; i++) {       System.out.println("\tDomain[" + i +"] = " + domains[i]);    }   //MBean countSystem.out.println("MBean count = " + mbsc.getMBeanCount());    //process attributembsc.setAttribute(mbeanName, new Attribute("Name", "new value"));//set valueSystem.out.println("Name = " + mbsc.getAttribute(mbeanName, "Name"));//get value//invoke via proxyHelloMBean proxy = (HelloMBean) MBeanServerInvocationHandler.newProxyInstance(mbsc, mbeanName, HelloMBean.class, false);        proxy.helloWorld();proxy.helloWorld("I'll connect to JMX Server via client.");   //invoke via rmimbsc.invoke(mbeanName, "helloWorld", null, null);         mbsc.invoke(mbeanName, "helloWorld", new Object[] { "I'll connect to JMX Server via client2." }, new String[] { String.class.getName() });   //get mbean informationMBeanInfo info = mbsc.getMBeanInfo(mbeanName);         System.out.println("Hello Class:" + info.getClassName());      System.out.println("Hello Attriber:" + info.getAttributes()[0].getName());     System.out.println("Hello Operation:" + info.getOperations()[0].getName());   //ObjectName of MBeanSystem.out.println("all ObjectName:---------------");        Set set = mbsc.queryMBeans(null, null);for (Iterator it = set.iterator(); it.hasNext();) {ObjectInstance oi = (ObjectInstance)it.next();        System.out.println("\t" + oi.getObjectName());        }jmxc.close();     }    }