1、涉及到的几个概念
切面类、被切对象、切入点、切入时间、切入内容；（自己命的名，好理解点）
2、看配置文件
<?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-2.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-2.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-2.0.xsd"> <bean id="audience" class="com.spring.test.aop.Audience"/> <bean id="sax" class="com.spring.test.setter.Saxophone"/>
<bean id="kenny" class="com.spring.test.setter.Instrumentalist">
<property name="song" value="Jingle Bells" />
<property name="age" value="25" />
<property name="instrument" ref="sax"/>
</bean> <aop:config proxy-target-class="true">
<aop:aspect ref="audience">
<aop:pointcut id="performance" expression="execution(* com.spring.test.setter.Instrumentalist.*(..))"/>
<!--<aop:pointcut id="performance1" expression="execution(* com.spring.test.action1.Performer.perform(..))"/>--> <aop:before pointcut-ref="performance" method="takeSeats"/>
<aop:before pointcut-ref="performance" method="turnOffCellPhones"/>
<aop:after-returning pointcut-ref="performance" method="applaud"/>
<aop:after-throwing pointcut-ref="performance" method="demandRefund"/> </aop:aspect>
</aop:config>
</beans>
AOP配置文件
3、需要引入的jar包
4、代码
package com.spring.test.action1;
public interface Performer {
void perform() ;
}
package com.spring.test.setter; import com.spring.test.action1.Performer;
/**
* 被切面类，（一般是业务类）
* @author Administrator
*
*/
public class Instrumentalist implements Performer{
private String song;
private int age;
private Instrument instrument;
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getSong() {
return song;
}
public void setSong(String song) {
this.song = song;
}
public Instrument getInstrument() {
return instrument;
}
public void setInstrument(Instrument instrument) {
this.instrument = instrument;
}
public Instrumentalist(){}
public Instrumentalist(String song,int age,Instrument instrument){
this.song = song;
this.age = age;
this.instrument = instrument;
}
public void perform() {
System.out.println("Instrumentalist age:"+age);
System.out.print("Playing "+song+":");
instrument.play();
}
public void say(){
System.out.println("this is saying !!!!!");
}
}
package com.spring.test.setter;
public interface Instrument {
public void play();
}
package com.spring.test.setter;
public class Saxophone implements Instrument {
public Saxophone(){}
public void play() {
System.out.println("TOOT TOOT TOOT");
}
}
package com.spring.test.aop;
/**
* 切面类
* @author Administrator
*
*/
public class 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");
}
public void demandRefund(){
System.out.println("Boo! We want money back");
}
}
package com.spring.test.setter; import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext; public class test {
public static void main(String[] args) {
ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml"); Instrumentalist performer = (Instrumentalist)ctx.getBean("kenny");
performer.perform();
performer.say(); }
}
5、关于切点表达式 详见：
http://www.cnblogs.com/yanjunwu/p/3996570.html
切面编程优点：有利于系统维护、升级、优化改造；便于将业务逻辑分离；