JMX学习笔记(三)：MXBean-优快云博客

MXBean

MXBean也是JMX MBean的一种，与MBean的区别是：MXBean引用一组预定义的数据类型，通过这种方式，MBean可以被任何形式的客户端使用，包括远程客户端。MXBean提供一种方便的方式将相关值打包在一起,不需要客户专门配置为处理包。

我个人比较浅显的理解是，MBean与MXBean的区别是：定义MBean接口实现类的属性时，MBean只支持Java的八种基本数据和一些简单的引用类型，如String。不能支持复杂数据类型的关联映射。而MXBean接口实现类定义属性时，支持基本数据类型，引用数据类型，和自定义的数据类型。

MBean与MXBean编写规则非常相似,同样是定义xxxMXBean interface,实现xxxMXBean接口;在编写MXBean接口时，也可以不以MXBean结尾，而在是接口上使用@MXBean注释，表示接口为MXBean接口。

例：以MXBean方式编写程序，在 MXBean实现类中定义属性为引用类型：

#Step 1:定义MXBean接口

package com.jmx.demo3;

import java.util.List;

public interface LibrariesMXBean {
	

	public int getTotal();

	public List<Book> getBookList();
	
	public Book getBook(int index);
	
	public void clearBookList();

}

#Step 2 ：编写一个普通类Book

package com.jmx.demo3;

import java.beans.ConstructorProperties;

public class Book {
	private int index;
	private String title;
	private int price;
	private String author;

	@ConstructorProperties({ "index", "title", "price", "author" })
	public Book(int index, String title, int price, String author) {
		this.index = index;
		this.title = title;
		this.price = price;
		this.author = author;
	}

	public int getIndex() {
		return index;
	}

	public void setIndex(int index) {
		this.index = index;
	}

	public String getTitle() {
		return title;
	}

	public void setTitle(String title) {
		this.title = title;
	}

	public int getPrice() {
		return price;
	}

	public void setPrice(int price) {
		this.price = price;
	}

	public String getAuthor() {
		return author;
	}

	public void setAuthor(String author) {
		this.author = author;
	}

}

#Step 3: 编写MXBean的实现类Libraries

package com.jmx.demo3;

import java.util.List;

public class Libraries implements LibrariesMXBean {
	private static List<Book> bookList;

	public Libraries(List<Book> bookList) {
		this.bookList = bookList;
	}

	@Override
	public List<Book> getBookList() {
		return bookList;
	}

	@Override
	public int getTotal() {
		return bookList.size() ;
	}

	@Override
	public void clearBookList() {
		bookList.clear();
	}

	@Override
	public Book getBook(int index) {
		if(bookList.size() > 0){
			return bookList.get(index);
		}
		return null;
	}

}

#Step 4: 创建MBeanServer，并注册MXBean

package com.jmx.demo3;

import java.lang.management.ManagementFactory;
import java.util.ArrayList;
import java.util.List;

import javax.management.MBeanServer;
import javax.management.MBeanServerFactory;
import javax.management.ObjectName;

public class Main {
	public static void main(String[] args) throws Exception {
//		MBeanServer mbs = MBeanServerFactory.createMBeanServer();
		MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
		ObjectName mxbeanName = new ObjectName("com.jmx.demo3:type=Libraries");
		List<Book> bookList = new ArrayList<Book>();
		bookList.add(new Book(1, "Thinking in Java", 99, "Bruce Eckel"));
		bookList.add(new Book(2, "Effective Java", 88, "Joshua Bloch"));
		bookList.add(new Book(3, "Core java", 42, "Cay S. Horstmann"));
		Libraries libraries = new Libraries(bookList);
		mbs.registerMBean(libraries, mxbeanName);
		System.out.println("Waiting forever...");
		Thread.sleep(Long.MAX_VALUE);
		
	}
}