Spring静态代理和动态代理代码详解

//log4j的使用见文章“log4j介绍”
import org.apache.log4j.Logger;
public class Person {
	private Logger logger = Logger.getLogger(Person.class);
	public void sleep(){
		logger.info(“开始执行时间:“ + new Date());
		System.out.println("睡觉中");
		logger.info(“执行结束时间:” + new Date());
	}
	public void eating(){
		logger.info("开始执行时间:“ + new Date()");
		System.out.println("正在吃饭中");
		logger.info("“执行结束时间:” + new Date()");
	}
}

public interface IPerson {
	public abstract void sleep();
	public abstract void eating();
}

public class Person implements IPerson {
	public void sleep(){
		System.out.println("睡觉中");
	}
	public void eating(){
		System.out.println("正在吃饭中");
	}
}

import org.apache.log4j.Logger;
public class PersonProxy implements IPerson {
	private IPerson person;
	private Logger logger = Logger.getLogger(PersonProxy.class);
	public PersonProxy(IPerson person) {
		this.person = person;
	}
	public void eating() {
		logger.info("开始执行时间:“ + new Date()");
		person.eating();
		logger.info("“执行结束时间:” + new Date()");
	}
	public void sleep() {
		logger.info("开始执行时间:“ + new Date()");
		person.sleep();
		logger.info("“执行结束时间:” + new Date()");
	}
}

package com.aptech.aop2;
public class PersonTest {
	public static void main(String[] args) {
		IPerson proxy = new PersonProxy(new Person());
		proxy.eating();
		proxy.sleep();
	}
}

public class DynaProxyHandler implements InvocationHandler {
	private Logger logger = Logger.getLogger(DynaProxyHandler.class);
	private Object target;
	//被代理对象
	public void setTarget(Object target) {
		this.target = target;
	}
	public Object invoke(Object proxy, Method method, Object[] args)
	              throws Throwable {
		logger.info("执行开始时间:" + new Date());
		Object result = method.invoke(target, args);
		logger.info("执行结束时间:" + new Date());
		return result;
		//返回method执行结果
	}
}

import java.lang.reflect.Proxy;
public class DynaProxyFactory {
	//obj为被代理对象
	public static Object getProxy(Object obj){
		DynaProxyHandler handler = new DynaProxyHandler();
		handler.setTarget(obj);
		return Proxy.newProxyInstance(obj.getClass().getClassLoader(), obj.getClass().getInterfaces(), handler);
	}
}

public class PersonTest {
	public static void main(String[] args) {
		IPerson person = (IPerson) DynaProxyFactory.getProxy(new Person());
		//返回代理类,代理类是JVM在内存中动态创建的,该类实现传入的接口数组的全部接口(的全部方法).
		person.eating();
		person.sleep();
	}
}