8、编写程序来连接MBean

前面用Html、jconsole等方法连接上了MBeanServer，并能够通过这些界面来操纵MBean。但有时我们需要不借助这些客户端，而是在自己的程序来操纵这些MBean，这就要求我们知道如何在代码里连接MBean。

　

　　基于上一篇为jconsole而修改的例子，给出一个示例的客户端程序，基本的操作都有了：

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;

public class Client {

    public static void main(String[] args) throws Exception {
        JMXServiceURL url = new JMXServiceURL("service:jmx:rmi:///jndi/rmi://localhost:9999/server");
        JMXConnector jmxc = JMXConnectorFactory.connect(url, null);
        MBeanServerConnection mbsc = jmxc.getMBeanServerConnection();
        ObjectName mbeanName = new ObjectName("chengang:name=HelloWorld");

        //把所有Domain都打印出来
        System.out.println("Domains:---------------");
        String domains[] = mbsc.getDomains();
        for (int i = 0; i < domains.length; i++) {
            System.out.println("\tDomain[" + i + "] = " + domains[i]);
        }

        //MBean的总数
        System.out.println("MBean count = " + mbsc.getMBeanCount());

        //对name属性的操作（属性名的第一个字母要大写）
        mbsc.setAttribute(mbeanName, new Attribute("Name", "Chen.Gang"));//设值
        System.out.println("Name = " + mbsc.getAttribute(mbeanName, "Name"));//取值

        //得到proxy代理后直接调用的方式
        HelloMBean proxy = (HelloMBean) MBeanServerInvocationHandler.newProxyInstance(mbsc, mbeanName, HelloMBean.class, false);
        proxy.printHello();
        proxy.printHello("陈刚");

        //远程调用的方式
        mbsc.invoke(mbeanName, "printHello", null, null);
        mbsc.invoke(mbeanName, "printHello", new Object[] { "子在川上曰" }, new String[] { String.class.getName() });

        //得mbean的信息
        MBeanInfo 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());

        //得到所有的MBean的ObjectName
        System.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());
        }

        //注销
        //mbsc.unregisterMBean(mbeanName);
        //关闭MBeanServer连接
        jmxc.close();
    }
}

　

运行后的效果如下：

Domains:---------------
 Domain[0] = HelloAgent
 Domain[1] = JMImplementation
 Domain[2] = chengang
MBean count = 3
Name = Chen.Gang
Hello Class: mbean.connector.Hello
Hello Attriber：Name
Hello Operation：printHello
all ObjectName：---------------
 chengang:name=HelloWorld
 JMImplementation:type=MBeanServerDelegate
 HelloAgent:name=htmladapter,port=8082

　

　

它有两个Console输出，这里是另一个

Hello World, Chen.Gang
Hello , 陈刚
Hello World, Chen.Gang
Hello , 子在川上曰