jmx例子一则

package com.cxz.dynamic; import java.lang.reflect.Constructor; import java.util.Iterator; import javax.management.Attribute; import javax.management.AttributeList; import javax.management.AttributeNotFoundException; import javax.management.DynamicMBean; import javax.management.InvalidAttributeValueException; import javax.management.MBeanAttributeInfo; import javax.management.MBeanConstructorInfo; import javax.management.MBeanException; import javax.management.MBeanInfo; import javax.management.MBeanNotificationInfo; import javax.management.MBeanOperationInfo; import javax.management.MBeanParameterInfo; import javax.management.ReflectionException; public class HelloDynamic implements DynamicMBean { private String name = null; private MBeanInfo mBeanInfo = null; private String className = null; private String description = null; private MBeanAttributeInfo[] attributes = null; private MBeanConstructorInfo[] constructors = null; private MBeanOperationInfo[] operations = null; MBeanNotificationInfo[] mBeanNotificationInfoArray = null; public HelloDynamic() { init(); buildDynamicMBean(); } private void buildDynamicMBean() { Constructor[] thisConstructors = this.getClass().getConstructors(); // create the constructors. constructors[0] = new MBeanConstructorInfo( "HelloDynamic(): Constructs a HelloDynamic object", thisConstructors[0]); // define the attribute of a mbean and its getter/setter attributes[0] = new MBeanAttributeInfo("Name", "java.lang.String", "Name:name string.", true, true, false); MBeanParameterInfo[] params = null; // Define the operation array. operations[0] = new MBeanOperationInfo("print", "print(): print the name", params, "void", MBeanOperationInfo.INFO); // Dynamically create an instance of a MBean. // Includes:attributes, constructors, operations, notifications mBeanInfo = new MBeanInfo(className, description, attributes, constructors, operations, mBeanNotificationInfoArray); } private void init() { className = this.getClass().getName(); description = "Simple implementation of a dynamic MBean."; attributes = new MBeanAttributeInfo[1]; constructors = new MBeanConstructorInfo[1]; operations = new MBeanOperationInfo[1]; mBeanNotificationInfoArray = new MBeanNotificationInfo[1]; } /** * Add a new operation to the MBean Dynamically */ private void dynamicAddOperation() { init(); operations = new MBeanOperationInfo[2]; buildDynamicMBean(); operations[1] = new MBeanOperationInfo("print1", "print1(): print the name", null, "void", MBeanOperationInfo.INFO); mBeanInfo = new MBeanInfo(className, description, attributes, constructors, operations, mBeanNotificationInfoArray); } public Object getAttribute(String attribute) throws AttributeNotFoundException, MBeanException, ReflectionException { if (attribute == null) { return null; } else if ("Name".equals(attribute)) { return name; } else { return null; } } public AttributeList getAttributes(String[] attributeNames) { if (attributes == null) { return null; } else { AttributeList resultList = new AttributeList(); if (attributes.length == 0) { return resultList; } else { for (int i = 0; i < attributeNames.length; i++) { try { Object value = getAttribute(attributeNames[i]); resultList.add(new Attribute(attributeNames[i], value)); } catch (Exception ex) { ex.printStackTrace(); } } } return resultList; } } public MBeanInfo getMBeanInfo() { return mBeanInfo; } public Object invoke(String actionName, Object[] params, String[] signature) throws MBeanException, ReflectionException { if (actionName.equals("print")) { System.out.println("Hello, " + name + ", this is HelloDynamic!"); dynamicAddOperation(); } else if (actionName.equals("print1")) { System.out.println("This is the dynamic operation"); } else { throw new ReflectionException(new NoSuchMethodException( actionName), "Cannot find the operation " + actionName + " in " + className); } return null; } public void setAttribute(Attribute attribute) throws AttributeNotFoundException, InvalidAttributeValueException, MBeanException, ReflectionException { if (attribute == null) { return; } else { String name = attribute.getName(); Object value = attribute.getValue(); try { if (name.equals("Name")) { if (value == null) { name = null; } else if ((Class.forName("java.lang.String")) .isAssignableFrom(value.getClass())) { this.name = (String) value; } } } catch (Exception ex) { ex.printStackTrace(); } } } public AttributeList setAttributes(AttributeList attributes) { if (attributes == null) return null; AttributeList resultList = new AttributeList(); if (attributes.isEmpty()) { return resultList; } for (Iterator i = attributes.iterator(); i.hasNext();) { Attribute attr = (Attribute) i.next(); try { setAttribute(attr); String name = attr.getName(); Object value = getAttribute(name); resultList.add(new Attribute(name, value)); } catch (Exception ex) { ex.printStackTrace(); } } return resultList; } }