內(nèi)容
java基礎(chǔ)鞏固筆記 - 實(shí)現(xiàn)AOP功能的封裝與配置的小框架
設(shè)計(jì)（目錄）：
XXX = java.util.ArrayList中
代碼
Advice接口
MyAdvice類
BeanFactory類
ProxyFactoryBean類
AopFrameWorkTest類
輸出
本文通過是動(dòng)態(tài)代理實(shí)現(xiàn)的AOP功能的封裝與配置的小框架.加深對動(dòng)態(tài)代理和AOP編程的理解
獲取源碼借嗽，學(xué)習(xí)交流衷蜓，那就加入小編的學(xué)習(xí)交流群吧害淤！616 959 444
設(shè)計(jì)
根據(jù)配置文件的鍵xxx對應(yīng)的值(類全名)創(chuàng)建相應(yīng)類的對象澜建。
當(dāng)且僅當(dāng)xxx對應(yīng)的值為com.iot.proxy.aopframework.ProxyFactoryBean時(shí)渣聚，則生成相應(yīng)的動(dòng)態(tài)代理類對象阳惹。代理對象的目標(biāo)類和通知實(shí)現(xiàn)類分別由xxx.target和xxx.advice配置
配置文件
了解更多Java知識的榛，獲取原視頻，源碼邑遏，學(xué)習(xí)交流佣赖，那就加入小編的學(xué)習(xí)交流群吧！616 959 444
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,用于讀取配置文件记盒，根據(jù)配置創(chuàng)建相應(yīng)的對象
ProxyFactoryBean,用于生成代理對象憎蛤，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)類纪吮，打印執(zhí)行方法前的時(shí)間及執(zhí)行耗時(shí)
AopFrameWorkTest俩檬，測試效果
代碼
Advice接口
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);
}
MyAdvice類
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));
}
}
獲取源碼，學(xué)習(xí)交流碾盟，那就加入小編的學(xué)習(xí)交流群吧棚辽！
616
959
444
BeanFactory類
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;
}
}
ProxyFactoryBean類
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;
}
}
AopFrameWorkTest類
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();
}
}
獲取源碼，學(xué)習(xí)交流冰肴，那就加入小編的學(xué)習(xí)交流群吧屈藐！616 959 444
輸出
配置
xxx=com.iot.proxy.aopframework.ProxyFactoryBean
輸出為：
com.sun.proxy.$Proxy0clear before at 0clear cost total 0
配置
xxx=java.util.ArrayList
輸出為：
java.util.ArrayList
可以看出，只改變配置文件熙尉，就可改變代碼的運(yùn)行結(jié)果联逻，從而達(dá)到靈活的效果
