[探究JMX] 3、JMX服务器端连接

一、简介

 

      上一节介绍的是通过Web方式访问和操控MBean，本节所要介绍的是通过RMI方式，实现客户端与服务器端的通信，即客户端获取MBeanServerConnection，然后对服务器端被注册的MBean进行操作。

 

二、代码实例

 

 package com.muyu.jmx;

import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import javax.management.MBeanServer;
import javax.management.MBeanServerFactory;
import javax.management.ObjectName;
import javax.management.remote.JMXAuthenticator;
import javax.management.remote.JMXConnectorServer;
import javax.management.remote.JMXConnectorServerFactory;
import javax.management.remote.JMXPrincipal;
import javax.management.remote.JMXServiceURL;
import javax.security.auth.Subject;

public class MServer {
    
    public static void main(String[] args) {
        
        MBeanServer server = MBeanServerFactory.createMBeanServer();
        ObjectName configName;
        try {
            configName = new ObjectName("LuisFigo:name=config");
            Config config = new Config();
            server.registerMBean(config, configName);

          //注册RMI端口号
            Registry registry = LocateRegistry.createRegistry(9999);
            JMXServiceURL url = new JMXServiceURL("service:jmx:rmi:///jndi/rmi://localhost:9999/mserver");        
            //权限验证
            Map env = new HashMap();
            env.put(JMXConnectorServer.AUTHENTICATOR, 
                    new JMXAuthenticator() { 
                public Subject authenticate(Object credentials) { 
                    String[] sCredentials = (String[]) credentials; 
                    String userName = sCredentials[0]; 
                    String password = sCredentials[1]; 
                    if ("admin".equals(userName) && "admin".equals(password)) { 
                        Set principals = new HashSet(); 
                        principals.add(new JMXPrincipal(userName)); 
                        return new Subject(true, principals, Collections.EMPTY_SET, Collections.EMPTY_SET);
                        } 
                    else 
                        throw new SecurityException("Authentication failed! "); 
                    } 
                }
            );
            JMXConnectorServer cs = JMXConnectorServerFactory.newJMXConnectorServer(url, env, server); 

            cs.start();
            System.out.println("rmi　start.....");
            
        } catch (Exception e) {
            e.printStackTrace();
        }  
        
    }
   
}

 

package com.muyu.jmx;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

import javax.management.Attribute;
import javax.management.MBeanServerConnection;
import javax.management.MBeanServerInvocationHandler;
import javax.management.ObjectName;
import javax.management.remote.JMXConnector;
import javax.management.remote.JMXConnectorFactory;
import javax.management.remote.JMXServiceURL;

public class MClient {

    public static void main(String[] args) {
        try {
            JMXServiceURL url = new JMXServiceURL(
                    "service:jmx:rmi:///jndi/rmi://localhost:9999/mserver");
            Map env = new HashMap();
            env.put(JMXConnector.CREDENTIALS, new String[]{"admin", "admin"});
            
            JMXConnector jmxc = JMXConnectorFactory.connect(url, env);
            MBeanServerConnection mbsc = jmxc.getMBeanServerConnection();

            Set names = mbsc.queryNames(null, null);
            for (Iterator i = names.iterator(); i.hasNext();) {
                System.out.println("\tObjectName = " + (ObjectName) i.next());
            }

            ObjectName stdMBeanName = new ObjectName("LuisFigo:name=config");

            mbsc.invoke(stdMBeanName, "printConfigLocation", new String[]{"helloworld"}, new String[]{"java.lang.String"});
            mbsc.setAttribute(stdMBeanName, new Attribute("ConfigLocation", "LuisFigo, this is a new configLocation"));

            ConfigMBean proxy = (ConfigMBean) MBeanServerInvocationHandler
                    .newProxyInstance(mbsc, stdMBeanName, ConfigMBean.class, false);
            System.out.println(proxy.getConfigLocation());
            proxy.setConfigLocation("Beckham");
            System.out.println(proxy.getConfigLocation());
            proxy.printConfigLocation();
            jmxc.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

 

说明

 

       运行MServer，其中LocateRegistry.createRegistry(9999)这段代码是为了注册RMI端口，下面JMXServiceURL会用 到9999这个端口。Env用于控制新连接器服务器的行为的一组属性，上面的部分代码是为了实现权限验证。如果客户端不输入正确的用户名和密码，则获取MServer服务端的连接。执行MClient，会发现一些有意思的现象，执行mbsc.invoke(stdMBeanName, "printConfigLocation", new String[]{"helloworld"}, new String[]{"java.lang.String"});这段代码时，其实是MServer端的MBean在执行printConfigLocation方法。假如MServer部署在一个JVM上，而MClient部署在另一个不同的JVM上，会得到同样的效果。不难看出利用远程调用方法也可以轻松实现分布式处理。

 

三、 总结

      使用JMX框架，可以用SUN自带的web方式管理MBean，也可以通过RMI接口自己实现对服务端MBean进行操作。下一节还会详细介绍Spring怎样集成MX4J实现JMX编程，MX4J自己实现了一套比较实用的界面来管理MBean。

 

 

评论

1 楼 zilongzilong 2016-01-13  

    5篇文章对JMX讲解很到位，赞一个