AOP实现方法

原文地址

http://michael-softtech.iteye.com/blog/650779

(1)使用ProxyFactoryBean的代理

Java代码

package chapter4;
public interface Performable {
public void perform() throws Exception;
}
package chapter4;
import java.util.Random;
public class Artist implements Performable {
public void perform() throws Exception {
int num = new Random().nextInt(100);
if(num >= 50) {
throw new Exception(String.valueOf(num));
} else {
System.out.println(num);
}
}
}
package chapter4;
public class Audience {
public Audience() {
}
public void takeSeats() {
System.out.println("The audience is taking their seats.");
}
public void turnOffCellPhones() {
System.out.println("The audience is turning off " + "their cellphones");
}
public void applaud() {
System.out.println("CLAP CLAP CLAP CLAP CLAP");
}
public void demandRefund() {
System.out.println("Boo! We want our money back!");
}
}
package chapter4;
import java.lang.reflect.Method;
import org.springframework.aop.AfterReturningAdvice;
import org.springframework.aop.MethodBeforeAdvice;
import org.springframework.aop.ThrowsAdvice;
public class AudienceAdvice
implements MethodBeforeAdvice, AfterReturningAdvice, ThrowsAdvice {
private Audience audience;
public void setAudience(Audience audience) {
this.audience = audience;
}
public void before(Method method, Object[] args, Object target)
throws Throwable {
audience.takeSeats();
audience.turnOffCellPhones();
}
public void afterReturning(Object returnValue, Method method, Object[] args,
Object target) throws Throwable {
audience.applaud();
}
public void afterThrowing(Exception ex) {
audience.demandRefund();
}
}

Xml代码

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">
<bean id="audience" class="chapter4.Audience" />
<bean id="audienceAdvice" class="chapter4.AudienceAdvice" >
<property name="audience" ref="audience" />
</bean>
<bean id="audienceAdvisor" class="org.springframework.aop.aspectj.AspectJExpressionPointcu

tAdvisor">
<property name="advice" ref="audienceAdvice" />
<property name="expression" value="execution(* *.perform(..))" />
</bean>
<bean id="artistTarget" class="chapter4.Artist" />
<bean id="artist" class="org.springframework.aop.framework.ProxyFactoryBean" >
<property name="target" ref="artistTarget" />
<property name="interceptorNames" value="audienceAdvisor" />
<property name="proxyInterfaces" value="chapter4.Performable" />
</bean>
</beans>

(2)隐式使用ProxyFactoryBean的aop代理

DefaultAdvisorAutoProxyCreator实现了BeanPostProcessor，它将自动检查advisor的pointcut是否匹配bean的方法，如果匹配会替换bean为一个proxy，并且应用其advice。

Xml代码

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">
<bean class="org.springframework.aop.framework.autoproxy.DefaultAdvisorAutoProxyC

reator" />
<bean id="audience" class="chapter4.Audience" />
<bean id="audienceAdvice" class="chapter4.AudienceAdvice" >
<property name="audience" ref="audience" />
</bean>
<bean id="audienceAdvisor" class="org.springframework.aop.aspectj.AspectJExpressionPointcu

tAdvisor">
<property name="advice" ref="audienceAdvice" />
<property name="expression" value="execution(* *.perform(..))" />
</bean>
<bean id="artist" class="chapter4.Artist" />
</beans>

(3)使用注解的aop代理

xml中增加了一个<aop:aspectj-autoproxy />，它创建了AnnotationAwareAspectJAutoProxyCreator在spring中，这个类将自动代理匹配的类的放方法。和上个例子中DefaultAdvisorAutoProxyCreator做同样的工作。

Java代码

package chapter4;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.AfterThrowing;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
@Aspect
public class Audience {
public Audience() {
}
@Pointcut("execution(* *.perform(..))")
public void pointcut(){}
@Before("pointcut()")
public void takeSeats() {
System.out.println("The audience is taking their seats.");
}
@Before("pointcut()")
public void turnOffCellPhones() {
System.out.println("The audience is turning off " + "their cellphones");
}
@AfterReturning("pointcut()")
public void applaud() {
System.out.println("CLAP CLAP CLAP CLAP CLAP");
}
@AfterThrowing("pointcut()")
public void demandRefund() {
System.out.println("Boo! We want our money back!");
}
}

Xml代码

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">
<aop:aspectj-autoproxy />
<bean id="audience" class="chapter4.Audience" />
<bean id="artist" class="chapter4.Artist" />
</beans>

(4)使用aop配置文件的自动代理

采用这种方法，不用加<aop:aspectj-autoproxy />

Java代码

package chapter4;
import org.aspectj.lang.annotation.Aspect;
@Aspect
public class Audience {
public Audience() {
}
public void pointcut() {
}
public void takeSeats() {
System.out.println("The audience is taking their seats.");
}
public void turnOffCellPhones() {
System.out.println("The audience is turning off " + "their cellphones");
}
public void applaud() {
System.out.println("CLAP CLAP CLAP CLAP CLAP");
}
public void demandRefund() {
System.out.println("Boo! We want our money back!");
}
}

Xml代码

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">
<bean id="audience" class="chapter4.Audience" />
<aop:config>
<aop:aspect ref="audience">
<aop:before method="takeSeats" pointcut="execution(* *.perform(..))" />
<aop:before method="turnOffCellPhones" pointcut="execution(* *.perform(..))" />
<aop:after-returning method="applaud" pointcut="execution(* *.perform(..))" />
<aop:after-throwing method="demandRefund" pointcut="execution(* *.perform(..))" />
</aop:aspect>
</aop:config>
<bean id="artist" class="chapter4.Artist" />
</beans>

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