這篇文章主要介紹了Java如何實(shí)現(xiàn)AOP功能的封裝與配置的小框架，具有一定借鑒價(jià)值，感興趣的朋友可以參考下，希望大家閱讀完這篇文章之后大有收獲，下面讓小編帶著大家一起了解一下。
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根據(jù)配置文件的鍵xxx對(duì)應(yīng)的值(類全名)創(chuàng)建相應(yīng)類的對(duì)象。
當(dāng)且僅當(dāng)xxx對(duì)應(yīng)的值為com.iot.proxy.aopframework.ProxyFactoryBean時(shí)，則生成相應(yīng)的動(dòng)態(tài)代理類對(duì)象。代理對(duì)象的目標(biāo)類和通知實(shí)現(xiàn)類分別由xxx.target和xxx.advice配置
config.propertiest位于aopframework包下
xxx代表要加載的類
xxx.advice代表通知接口的某個(gè)實(shí)現(xiàn)類
xxx.target代表委托類
#xxx=java.util.ArrayList
xxx=com.iot.proxy.aopframework.ProxyFactoryBean
xxx.advice=com.iot.proxy.MyAdvice
xxx.target=java.util.ArrayList
包:com.iot.proxy.aopframework,有如下幾個(gè)類/接口：
BeanFactory,用于讀取配置文件，根據(jù)配置創(chuàng)建相應(yīng)的對(duì)象
ProxyFactoryBean,用于生成代理對(duì)象，含有兩個(gè)私有屬性:目標(biāo)和通知
Advice,通知接口，用于把切面的代碼以對(duì)象的形式傳遞給InvocationHandler的的invoke方法
MyAdvice,Advice接口的一個(gè)實(shí)現(xiàn)類，打印執(zhí)行方法前的時(shí)間及執(zhí)行耗時(shí)
AopFrameWorkTest，測(cè)試效果
重慶分公司
重慶分公司
package com.iot.proxy.aopframework;
import java.lang.reflect.Method;
/**
* Created by brian on 2016/2/2.
*/
public interface Advice {
void beforeMethod(Method method);
void aftereMethod(Method method);
}package com.iot.proxy.aopframework;
import java.lang.reflect.Method;
/**
* Created by brian on 2016/2/2.
*/
public class MyAdvice implements Advice{
long beginTime = 0 ;
@Override
public void beforeMethod(Method method) {
System.out.println(method.getName()+" before at "+beginTime);
beginTime = System.currentTimeMillis();
}
@Override
public void aftereMethod(Method method) {
long endTime = System.currentTimeMillis();
System.out.println(method.getName()+" cost total "+ (endTime-beginTime));
}
}package com.iot.proxy.aopframework;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
/**
* Created by brian on 2016/2/2.
*/
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){
String className = properties.getProperty(name);
Object bean = null;
try {
Class clazz = Class.forName(className);
bean = clazz.newInstance();
}
catch (ClassNotFoundException e) {
e.printStackTrace();
}
catch (InstantiationException e) {
e.printStackTrace();
}
catch (IllegalAccessException e) {
e.printStackTrace();
}
if (bean instanceof ProxyFactoryBean){
ProxyFactoryBean proxyFactoryBean = (ProxyFactoryBean)bean;
Advice advice = null;
Object target = null;
try {
advice = (Advice) Class.forName(properties.getProperty(name+".advice")).newInstance();
target = Class.forName(properties.getProperty(name+".target")).newInstance();
}
catch (InstantiationException e) {
e.printStackTrace();
}
catch (IllegalAccessException e) {
e.printStackTrace();
}
catch (ClassNotFoundException e) {
e.printStackTrace();
}
proxyFactoryBean.setAdvice(advice);
proxyFactoryBean.setTarget(target);
Object proxy = ((ProxyFactoryBean) bean).getProxy();
return proxy;
}
return bean;
}
}package com.iot.proxy.aopframework;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
/**
* Created by brian on 2016/2/3.
*/
public class ProxyFactoryBean {
private Object target;
private Advice advice;
public Object getProxy(){
Object proxy = Proxy.newProxyInstance(
target.getClass().getClassLoader(),
target.getClass().getInterfaces(),
new InvocationHandler() {
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
advice.beforeMethod(method);
Object retVal = method.invoke(target,args);
advice.aftereMethod(method);
return retVal;
}
}
);
return proxy;
}
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;
}
}package com.iot.proxy.aopframework;
import java.io.InputStream;
import java.util.Collection;
/**
* Created by brian on 2016/2/3.
*/
public class AopFrameWorkTest {
public static void main(String[] args) {
InputStream inputStream = AopFrameWorkTest.class.getResourceAsStream("config.properties");
Object bean = new BeanFactory(inputStream).getBean("xxx");
System.out.println(bean.getClass().getName());
((Collection) bean).clear();
}
}配置xxx=com.iot.proxy.aopframework.ProxyFactoryBean
輸出為：
com.sun.proxy.$Proxy0
clear before at 0
clear cost total 0
配置xxx=java.util.ArrayList
輸出為：
java.util.ArrayList
可以看出，只改變配置文件，就可改變代碼的運(yùn)行結(jié)果，從而達(dá)到靈活的效果
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