JMX入门之StandardMBean HelloWord

（作者原创，可以任意转载请注明出处）

http://blog.youkuaiyun.com/zmxj

这个简单的Mbean只有一个属性和一个方法，StardBeanDemoMain 为调用类，
main方法中调用下面三个方法，代码中都有详细的注释：
sbean.doRegistBean();
sbean.doManageBean();
sbean.regHtmlAdaptor();

运行后，可以看到控制台打印的信息，
register StandMbean sucess..
Attribute:state -init value
Attribute:state 2 -new state
My service start.....

由于启动了HtmlAdaptor的服务，所以程序一直处于运行状态，（HtmlAdaptor是sun jmx实现自带的一个适配器）测试可以在浏览器中访问：
http://localhost:8082 就可以在浏览器中管理mbean了，在List of MBean operations下面按startService 按钮，可以看到控制台打出的信息，说明startService方法被调用了。Jdk1.4下需要jmxri.jar和jmxtools.jar两个包，Jdk50已经包括了Jmx的api。

/**
* Mbean接口
* StandBeanMBean.java
* @author zmxj
*/
public interface StandBeanMBean {

public String getState() ;

public void setState(String s) ;

public void startService();
}

/**
* Mbean实现
* StandBean.java
* @author zmxj
*/
public class StandBean implements StandBeanMBean {

private String state = "init value";

public String getState() {
return state;
}

public void setState(String s) {
state = s;
}

public void startService() {
System.out.println("My service start.....");
}

}

import javax.management.Attribute;
import javax.management.AttributeNotFoundException;
import javax.management.InstanceNotFoundException;
import javax.management.InvalidAttributeValueException;
import javax.management.MBeanException;
import javax.management.MBeanServer;
import javax.management.MBeanServerFactory;
import javax.management.MalformedObjectNameException;
import javax.management.ObjectName;
import javax.management.ReflectionException;

import com.sun.jdmk.comm.HtmlAdaptorServer;

/**
* Agent类
* StardBeanDemoMain.java
* @author zmxj
*/
public class StardBeanDemoMain {

private MBeanServer mBserver = null;

ObjectName mbeanObjectName = null;
String domain = null;
String mbeanName = "StandBean";

public static void main(String[] args) {

StardBeanDemoMain sbean = new StardBeanDemoMain();

sbean.doRegistBean();
sbean.doManageBean();
sbean.regHtmlAdaptor();
}

/**
* 创建MBeanServer并注册一个Mbean
*/
private void doRegistBean()
{
//创建MBeanServer
mBserver = MBeanServerFactory.createMBeanServer();
domain = mBserver.getDefaultDomain();

try {
mbeanObjectName = new ObjectName(domain + ":type=" + mbeanName);

/*
//这里可以直接创建并且同时注册一个mbean到MBeanServer.
server.createMBean(mbeanName,mbeanObjectName);
*/

StandBean bean = new StandBean();
mBserver.registerMBean(bean, mbeanObjectName);

System.out.println("register StandMbean sucess..");
} catch(MalformedObjectNameException e) {
e.printStackTrace();
System.exit(1);
} catch(Exception e){
e.printStackTrace();
System.exit(1);
}

}

/*
* 演示管理mbean，通过mbserver修改mbean的属性和执行mbean的方法
*/
private void doManageBean()
{
try {
ObjectName mbeanObjectName = new ObjectName(domain + ":type=" + mbeanName);

System.out.println("Attribute:state -"+mBserver.getAttribute(mbeanObjectName,"State"));

//修改属性State
Attribute stateAttribute = new Attribute("State","new state");
mBserver.setAttribute(mbeanObjectName, stateAttribute);

//取得属性值
System.out.println("Attribute:state 2 -"+mBserver.getAttribute(mbeanObjectName,"State"));

//调用方法startService
mBserver.invoke(mbeanObjectName,"startService",null,null);

} catch (Exception e) {
e.printStackTrace();
}
}

/*
* 注册HtmlAdaptor，注册后可以通过http://localhost:8082执行mbean管理操作
*/
private void regHtmlAdaptor()
{
HtmlAdaptorServer html = new HtmlAdaptorServer();
ObjectName html_name = null;
try {
html_name = new ObjectName("Adaptor:name=html,port=8082");
mBserver.registerMBean(html, html_name);
} catch(Exception e) {
System.out.println("\t!!! Could not create the HTML adaptor !!!");
e.printStackTrace();
return;
}
html.start();
}
}

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