静态代理和动态代理

Business.class

package aop;

public interface Business {
	public void print();
}

BusinessImpl.class

package aop;

import java.util.logging.Logger;

public class BusinessImpl implements Business {

	private Logger logger = Logger.getLogger(this.getClass().getName());
	public void print() {
//		System.out.println("Doing...");
		logger.info("Doing .....");
	}

}

静态代理
StaticProxy .java

package invocation;

import java.util.logging.Logger;

/**
 * @author  E-mail:congpeixue@126.com
 * @version 创建时间：2008-6-17 下午11:28:37 类说明
 */
public class StaticProxy {
	private Logger logger = Logger.getLogger(this.getClass().getName());
	public Business business;

	public StaticProxy(Business business) {

		this.business = business;
	}

	void print() {

		logger.info("Start");

		// 回调
		business.print();

		logger.info("End");
	}
}

StaticProxyTest.java

package invocation;
/**
 * @author  E-mail:congpeixue@126.com
 * @version 创建时间：2008-6-17 下午11:38:38
 * 类说明
 */
public class StaticProxyTest {

	public static void main(String[] args) {
		Business business = new BusinessImpl();

		StaticProxy proxy = new StaticProxy(business);

		proxy.print();
	}

}

动态代理


LogHandler.class

package aop;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.util.logging.Logger;

public class LogHandler implements InvocationHandler {

	private Logger logger = Logger.getLogger(this.getClass().getName());
	private Object delegate;
	public LogHandler(Object delegate) {
		this.delegate = delegate;
	}
	public Object invoke(Object proxy, Method method, Object[] args)
			throws Throwable {
		Object object = null;
		try {
			logger.info("start" + method);
			object = method.invoke(delegate, args);
			logger.info("end" + method);
		} catch(Exception e) {
			logger.info("Exception");
		}
		return object;
	}
}

Main.class

package aop;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Proxy;

public class Main {
	public static void main(String[] args) {
		Business business = new BusinessImpl(); 

		InvocationHandler handler = new LogHandler(business); 
		System.out.println(business.getClass().getInterfaces());
		Business proxy = (Business) Proxy.newProxyInstance( business.getClass().getClassLoader(),
				business.getClass().getInterfaces(), handler); 
		proxy.print(); 
	}
}