Spring AOP四種實現方式
1. 經典的基於代理的AOP
1. 創建通知:定義一個接口
public interface Sleepable{
void sleep();
}
然後寫一個Human類,他實現了這個接口
public Human implements Sleepable{
public void sleep(){
System.out.println("睡覺中...!");
}
}
2.編寫一個SleepHelper類,它裡面包含了睡覺的輔助工作,用AOP術語來說它就應該是通知
public class SleepHelper implements MethodBeforeAdvice,AfterReturningAdvice {
public void before(Method method, Object[] arguments, Object target)
throws Throwable {
System.out.println("睡覺前");
}
public void afterReturning(Object rturnValue, Method method, Object[] arguments,
Object target) throws Throwable {
System.out.println("睡覺後");
}
}
然後在spring配置文件中進行配置:
<!-- 被代理目標對象 -->
<bean id="Human" class="cn.happy.dao.Human"></bean>
<bean id="SleepHelper" class="cn.happy.aop.SleepHelper"></bean>
//定義切點的常用的兩種方式:1)使用正則表達式 2)使用AspectJ表達式,
//這裡用正則表達式
<!-- 顧問 -->
<bean id="BeforAdvisor" class="org.springframework.aop.support.RegexpMethodPointcutAdvisor">
<property name="advice" ref="BeforAdvice"></property>
<property name="pattern" value=".*l.*g.*"></property>
</bean>
<!-- 代理對象 -->
// ProxyFactoryBean是一個代理,我們可以把它轉換為
//proxyInterfaces中指定的實現該interface的代理對象
<bean id="serviceProxy" class="org.springframework.aop.framework.ProxyFactoryBean">
<property name="target" ref="Human"></property>
<property name="interceptorNames" value="BeforAdvisor"></property>
</bean>
代理類
public class StuTest {
public static void main(String[] args) {
//通過ClassPathXmlApplicationContext實例化Spring的上下文
ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");
//通過ApplicationContext的getBean()方法,根據id來獲取Bean的實例
Sleepable s=(Sleepable)context.getBean("Human");
s.sleep();
}
}
3、使用AspectJ的注解
用@Aspect的注解來標識切面
@Aspect//該類為切面
public class MyAspect {
@Before(value="execution(public * *(..))")
public void mybefore(){
System.out.println("前置增強");
}
//後置增強
@AfterReturning(value="execution(public * *(..))")
public void myafterReturning(){
System.out.println("後置增強");
}
//異常增強
@AfterThrowing(value="execution(public * *(..))")
public void myafterThrowing(){
System.out.println("異常增強");
}
//環繞增強
@Around(value="execution(public * *(..))")
public void myAround(ProceedingJoinPoint jp){
System.out.println("環繞前增強");
try {
jp.proceed();
} catch (Throwable e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println("環繞後增強");
}
//最終增強
@After(value="execution(public * *(..))")
public void myafterLogger(){
System.out.println("最終增強");
}
}
Spring配置文件:
<!-- 目標對象 -->
<bean id="Human" class="cn.happy.dao.IserviceImpl"></bean>
<!-- 切面: -->
<bean id="myAspect" class="cn.happy.aop.MyAspect"></bean>
<aop:aspectj-autoproxy/>
測試類
public class StuTest {
public static void main(String[] args) {
ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");
Sleepable s=(Sleepable)context.getBean("Service");
s.sleep();
}
}
復制代碼
4、通過<aop:config>來配置(純POJO切面)
<aop:advisor> 定義一個AOP通知者
<aop:after> 後通知
<aop:after-returning> 返回後通知
<aop:after-throwing> 拋出後通知
<aop:around> 周圍通知
<aop:aspect>定義一個切面
<aop:before>前通知
<aop:config>頂級配置元素,類似於<beans>這種東西
<aop:pointcut>定義一個切點
public class MyAspect {
public void mybefore(){
System.out.println("前置增強");
}
public String myafterReturning(String Returning){
System.out.println("前置增強");
return Returning;
}
}
public class IserviceImpl implements Iservice{
public void log() {
System.out.println("開啟事務");
}
public String dofirst() {
System.out.println("記錄日志");
return "";
}
}
Spring的配置文件:
<!-- 目標對象 -->
<bean id="Service" class="cn.happy.dao.IserviceImpl"></bean>
<!-- 切面: -->
<bean id="myAspect" class="cn.happy.aop.MyAspect"></bean>
<!-- 配置切面 -->
<aop:config>
<!-- 配置切入點 -->
<aop:pointcut id="pointcut" expression="execution(public * *..Iservice.log(..))"/>
<!-- 將類方法定義為最終增強並引用pointcut切入點-->
<aop:aspect ref="myAspect">
<aop:after method="myafterReturning" pointcut-ref="pointcut"/>
</aop:aspect>
</aop:config>
測試類
public class SpringTest {
public static void main(String[] args) {
ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");
Iservice bean = (Iservice)context.getBean("Service");
bean.log();
String count=bean.dofirst();
System.out.println(count);
}
}
Spring AOP自定義注解方式實現日志管理 http://www.linuxidc.com/Linux/2015-11/125019.htm
Spring AOP進行日志記錄 http://www.linuxidc.com/Linux/2015-11/124731.htm
使用Spring AOP進行性能監控 http://www.linuxidc.com/Linux/2012-07/64681.htm
利用Spring AOP 更新Memcached 緩存策略的實現 http://www.linuxidc.com/Linux/2012-03/56503.htm
Spring AOP的兩種代理 http://www.linuxidc.com/Linux/2015-11/125017.htm
Spring AOP的注解實例 http://www.linuxidc.com/Linux/2015-11/125018.htm