代理模式03

1、基础类

import java.lang.reflect.Method;

/*系统功能的建议，spring中命名规则*/
public interface Advice {
?public void beforeMethod(Method method);
?public void afterMethod(Method method);
?public String CMethod();
}

import java.lang.reflect.Method;

public class MyAdvice implements Advice {

?long beginTime = 0;
?long endTime = 0;
?public void afterMethod(Method method) {
??System.out.println("结束时间");
?? endTime = System.currentTimeMillis();//获取毫秒信息
?? System.out.println(CMethod());
?}

?public void beforeMethod(Method method) {
??System.out.println("开始时间");
??beginTime = System.currentTimeMillis();
?}
?
?public String CMethod(){
??return "总共用时" + (beginTime - endTime) ;
?}

}

?

2、代理类

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

public class ProxyFactoryBean {

?private Object target;
?private Advice advice;

?public Object getProxy() {
??// 创建一个新的代理.
??// InvocationHandler动态方法
??Object proxy = Proxy.newProxyInstance(target.getClass()
????.getClassLoader(), target.getClass().getInterfaces(),
????new InvocationHandler() {
?????Object retVal = null;

?????public Object invoke(Object obj, Method method,
???????Object[] objs) throws Throwable {
??????advice.beforeMethod(method);
??????retVal = method.invoke(target, objs);
??????advice.afterMethod(method);
??????return retVal;
?????}
????});
??return proxy;
?}

?public String getString() {
??return "testProxyFactoryBean";
?}

?public Object getTarget() {
??return target;
?}

?public void setTarget(Object target) {
??this.target = target;
?}

?public Advice getAdvice() {
??return advice;
?}

?public void setAdvice(Advice advice) {
??this.advice = advice;
?}

}

定义名为config.properties配置文件，其中配置文件.target要代理的文件，.advice为在代理文件前后调用的代理方法，xxx为代理文件(判断是否在工厂进行加工)

#Proxy
#xxx=com.dhy.test.likeSpring.ProxyFactoryBean
xxx = java.util.ArrayList
#xxx=java.util.ArrayList
xxx.advice=com.dhy.test.likeSpring.MyAdvice
xxx.target=java.util.ArrayList

?

?

代理工厂

?

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Properties;

/* Bean工厂用来判定是否进入 AOP切面中，
?* 换句话说就是Bean进入工厂后，经过工厂的处理(其可以选择对进入的信息进行加工，也可以选择不加工)
?* 再输出出来，这就是工厂的概念*/
public class BeanFactory {
?
?Properties properties = new Properties();
?
?public BeanFactory(InputStream inputStream) {
??try {
???properties.load(inputStream);
??} catch (IOException e) {
???e.printStackTrace();
??}
?}
?
?public Object getBean(String name){
??//找到代理Bean的工厂
??String className = properties.getProperty(name);
??Class clazz = null;
??Object bean = null;
??try {
???clazz = Class.forName(className);
???bean = clazz.newInstance();//其就等于new自己
??} catch (Exception e) {
???e.printStackTrace();
??}
??//判断是否是代理工厂类型(没有定义为代理工厂即转出，不对其进行代理)
??if(bean instanceof Collection){
???Object proxy = null;
???ProxyFactoryBean proxyFactoryBean = new ProxyFactoryBean();
???try {
????//由配置文件中获取处理代理的类
????Advice advice = (Advice) Class.forName(properties.get(name + ".advice").toString()).newInstance();
????//获取要代理的类
????Object target = Class.forName(properties.get(name + ".target").toString()).newInstance();
????//设置代理的内部方法
????proxyFactoryBean.setAdvice(advice);
????//设置代理
????proxyFactoryBean.setTarget(target);
????proxy = proxyFactoryBean.getProxy();
???} catch (Exception e) {
????e.printStackTrace();
???}
???return proxy;
??}
??return bean;
?}
?
}

?