Java SE 6 新特性: JMX 与系统管理

package modelmbean; 

public class Server { 

 private long startTime; 
  
 public Server() { } 
  
 public int start(){ 
  startTime = System.currentTimeMillis(); 
  return 0; 
 } 
  
 public long getUpTime(){ 
  return System.currentTimeMillis() - startTime; 
 } 
} 

package modelmbean; 

import javax.management.*; 
import javax.management.modelmbean.*; 
public class Main { 
  
 public static void main(String[] args) throws Exception{ 
  MBeanServer mBeanServer = MBeanServerFactory.createMBeanServer(); 
  RequiredModelMBean serverMBean = 
         (RequiredModelMBean) mBeanServer.instantiate( 
           "javax.management.modelmbean.RequiredModelMBean");   
   
  ObjectName serverMBeanName = 
         new ObjectName("server: id=Server"); 
  serverMBean.setModelMBeanInfo(getModelMBeanInfoForServer(serverMBeanName));   
  Server server = new Server(); 
  serverMBean.setManagedResource(server, "ObjectReference"); 
   
  ObjectInstance registeredServerMBean = 
   mBeanServer.registerMBean((Object) serverMBean, serverMBeanName); 
   
  serverMBean.invoke("start",null, null); 
   
  Thread.sleep(1000); 
   
  System.out.println(serverMBean.getAttribute("upTime")); 
  Thread.sleep(5000); 
  System.out.println(serverMBean.getAttribute("upTime")); 
 } 
  
 private static ModelMBeanInfo getModelMBeanInfoForServer(ObjectName objectName)  
  throws Exception{ 
  ModelMBeanAttributeInfo[] serverAttributes = 
        new ModelMBeanAttributeInfo[1]; 
  Descriptor upTime = 
        new DescriptorSupport( 
          new String[] { 
            "name=upTime", 
            "descriptorType=attribute", 
            "displayName=Server upTime", 
            "getMethod=getUpTime",             
             }); 
  serverAttributes[0] = 
        new ModelMBeanAttributeInfo( 
          "upTime", 
          "long", 
          "Server upTime", 
          true, 
          false, 
          false, 
          upTime); 
   
  ModelMBeanOperationInfo[] serverOperations = 
        new ModelMBeanOperationInfo[2]; 
   
  Descriptor getUpTimeDesc = 
        new DescriptorSupport( 
          new String[] { 
            "name=getUpTime", 
            "descriptorType=operation", 
            "class=modelmbean.Server", 
            "role=operation"             
            }); 
   
  MBeanParameterInfo[] getUpTimeParms = new MBeanParameterInfo[0]; 
  serverOperations[0] = new ModelMBeanOperationInfo("getUpTime", 
         "get the up time of the server", 
         getUpTimeParms, 
         "java.lang.Long", 
         MBeanOperationInfo.ACTION, 
         getUpTimeDesc); 
       
  Descriptor startDesc = 
        new DescriptorSupport( 
          new String[] { 
            "name=start", 
            "descriptorType=operation", 
            "class=modelmbean.Server", 
            "role=operation" 
            }); 
  MBeanParameterInfo[] startParms = new MBeanParameterInfo[0]; 
  serverOperations[1] = new ModelMBeanOperationInfo("start", 
         "start(): start server", 
         startParms, 
         "java.lang.Integer", 
         MBeanOperationInfo.ACTION, 
         startDesc); 
   
  ModelMBeanInfo serverMMBeanInfo = 
        new ModelMBeanInfoSupport( 
          "modelmbean.Server", 
          "ModelMBean for managing an Server", 
          serverAttributes, 
          null, 
          serverOperations, 
          null); 
   
  //Default strategy for the MBean. 
  Descriptor serverDescription = 
        new DescriptorSupport( 
          new String[] { 
            ("name=" + objectName), 
            "descriptorType=mbean", 
            ("displayName=Server"), 
            "type=modelmbean.Server", 
            "log=T", 
            "logFile=serverMX.log", 
            "currencyTimeLimit=10" }); 
  serverMMBeanInfo.setMBeanDescriptor(serverDescription); 
       return serverMMBeanInfo; 
      } 

1.serverMBean.setModelMBeanInfo(getModelMBeanInfoForServer(serverMBeanName)); 
2.serverMBean.setManagedResource(server, "ObjectReference");