jmx 范例-最简单的例子

jmx 实例--最简单的例子

1，接口

/** * standard MBeans, dynamic MBeans, open MBeans(形如MXBean)  * and model MBeans,@MXBean()注解的接口名字可以任意取 * @author river.wang */@MXBean()public interface CMonitor0 {    public long getUptime();    public String getMemory();}

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?2，MBean，被管理对象，一如JavaBean。Bean对象，实体，对应资源。。。

/** * @author river.wang */public class ServerMonitor implements CMonitor0{    private final long startTime;    private Runtime runtime = Runtime.getRuntime();    public ServerMonitor() {        startTime = System.currentTimeMillis();    }    public long getUptime() {        return System.currentTimeMillis()-startTime;    }    public String getMemory() {        float freeMemory = (float)runtime.freeMemory();        float totalMemory = (float)runtime.totalMemory();        String memory = "idle scale : "+(freeMemory/totalMemory)+"%; freeMemory="            +(freeMemory)/1024+" KB; totalMemory="+(totalMemory)/1024+" KB" ;        return memory;    }}

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?3，运行下面程序，就可以用jconsole进行本地连接了

/** * @author river.wang */public class ServerMonitorAgent {    public static void main( String[] args )        throws Exception {        // MBeanServer server=MBeanServerFactory.createMBeanServer(); //不可在jconsole中使用        MBeanServer server = ManagementFactory.getPlatformMBeanServer();// 可在jconsole中使用        // 被管理的bean,"com.jmx"包名任意取        ObjectName monitorName = new ObjectName( "com.jmx:type=ServerMonitor" );        server.registerMBean( new ServerMonitor(), monitorName );        // 必须确保线程活着        Thread.sleep( Long.MAX_VALUE );    }}

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