Aspectj

Aspectj是AOP框架，扩展了java语言

 

接口：

public interface IUserService {
    public void select();
    public void insert();
    public void update();
    public void delete();
}


实现类：
    

public class UserServiceImpl implements IUserService {
    public void select(){
        System.out.println("select ok!");
    }

    public void insert() {
        //int result=5/0;
        System.out.println("insert ok!");
    }

    public void update() {
        System.out.println("update ok!");
    }

    public void delete() {
        System.out.println("delete ok!");
    }
}

@Aspect
public class MyAspect{
    @Pointcut("execution(* day010aspectj.*.insert(..))")
    public void insert(){}

    @Pointcut("execution(* day010aspectj.*.update(..))")
    public void update(){}

    @Pointcut("execution(* day010aspectj.*.delete(..))")
    public void delete(){}
  //01.前置增强
   @Before("execution(* day010aspectj.*.select(..))")
    public void beforeAdvice(){
        System.out.println("====before====");
    }

    //02.后置增强
    @AfterReturning("execution(* day010aspectj.*.select(..))")
    public void afterAdvice(){
        System.out.println("====after====");
    }
    
    //环绕增强
   @Around("execution(* day010aspectj.*.delete(..))")
    public void aroundAdvice(ProceedingJoinPoint pjp) throws Throwable {
       System.out.println("before====");
       pjp.proceed();
       System.out.println("====after====");
        //前后的隔离点
    }

  //异常增强

   @AfterThrowing("execution(*  day010aspectj.*.insert(..))")
   public void aroundAdvice() throws Throwable {
       System.out.println("出错误了");
       //前后的隔离点
   }
    //最终增强:类似于finally
    @After("execution(* day010aspectj.*.update(..))")
    public void finallyAdvice(){
        System.out.println("finallyAdvice==================");
        //前后的隔离点
    }
}


配置文件 ：

<!--1.目标对象-->
<bean id="service" class="day010aspectj.UserServiceImpl"></bean>

<!--2.增强/通知-->
<bean id="aroundAdvice" class="day010aspectj.MyAspect"></bean>

  <!--3.aspectj自动代理-->
  <aop:aspectj-autoproxy></aop:aspectj-autoproxy>


测试类：

public class Text0010 {
    @Test
    public void t1(){
        ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext18aspectj.xml");
        IUserService service=( IUserService) context.getBean("service");
        service.select();
        service.delete();
        service.insert();
        service.update();


    }

}




Aspectj基于XML的AOP实现

public interface SomeService {
    public void doSome();
    public  void doAny();
}

public interface SomeService1 {
    public void doFirst();
    public void doSecond();
    public void doThird();
}

public class SomeServiceimpl implements SomeService {
    public void doSome() {
       int i=5/0;
        System.out.println("dosome");
    }
    public  void doAny(){
        System.out.println("doany");
    }

}

public class SomeServiceimpl1 implements SomeService1 {

    public void doFirst() {
        System.out.println("1");
    }

    public void doSecond() {
        System.out.println("2");
    }

    public void doThird() {
        int i=5/0;
        System.out.println("3");
    }
}

public class MyAspect1 {
    // 前置通知
    public void before(){
        System.out.println("前置通知方法before()");
    }
    public void before(JoinPoint jp){
        System.out.println("前置通知方法before() jp = " + jp);
    }

    // 后置通知
    public void afterReturing(){
        System.out.println("后置通知方法");
    }
    public void afterReturing(String result){
        System.out.println("后置通知方法 result = " + result);
    }

    // 环绕通知
    public void  around(ProceedingJoinPoint pjp) throws Throwable{
        System.out.println("环绕通知方法，目标方法执行之前");
        // 执行目标方法
        Object result = pjp.proceed();
        System.out.println("环绕通知方法，目标方法执行之后");
       // return ((String)result).toUpperCase();
    }

    // 异常通知
    public void afterThrowing(){
        System.out.println("异常通知方法");
    }
    public void afterThrowing(Exception ex){
        System.out.println("异常通知方法 ex = " + ex.getMessage());
    }

    // 最终通知
    public void after(){
        System.out.println("最终通知方法");
    }


}





public class MyAspect {

   /* @Before("execution(* *..day05aspect.*.doSome(..))")
    public void MyBefore(){
        System.out.println("before");
    }
    @AfterReturning("execution(* *..day05aspect.*.doAny(..))")
    public void MyAfter(){
        System.out.println("after");
    }*/
   @Pointcut("execution(* *..day05aspect.*.doAny(..))")
   public void doAny(){}
    @Pointcut("execution(* *..day05aspect.*.doSome(..))")
    public void doSome(){}
    @Around("doAny()")
    public void MyAround(ProceedingJoinPoint joinPoint) throws Throwable {
        System.out.println("brfore");
        joinPoint.proceed();
        System.out.println("after");
    }
    @AfterThrowing(value = "doSome()",throwing="erro")
    public void MyThow(Exception erro){
        System.out.println("throw"+erro);
    }
@After("doSome()")
    public  void MyLastAfter(){
    System.out.println("last");
}

}




配置类：

<bean id="service" class="day05aspect.SomeServiceimpl1"></bean>

<bean id="myAspect" class="day05aspect.MyAspect1"></bean>
<aop:config>
    <aop:pointcut expression="execution(* *..SomeService1.doFirst(..))" id="doFirstPointcut"/>
    <aop:pointcut expression="execution(* *..SomeService1.doSecond(..))" id="doSecondPointcut"/>
    <aop:pointcut expression="execution(* *..SomeService1.doThird(..))" id="doThirdPointcut"/>
    <aop:aspect ref="myAspect">
        <aop:before method="before" pointcut-ref="doFirstPointcut"/>
        <aop:before method="before(org.aspectj.lang.JoinPoint)" pointcut-ref="doFirstPointcut"/>
        <aop:after-returning method="afterReturing" pointcut-ref="doSecondPointcut"/>
        <aop:after-returning method="afterReturing(java.lang.String)" pointcut-ref="doSecondPointcut" returning="result"/>
       <aop:around method="around" pointcut-ref="doSecondPointcut"/>
        <aop:after-throwing method="afterThrowing" pointcut-ref="doThirdPointcut"/>
        <aop:after-throwing method="afterThrowing(java.lang.Exception)" pointcut-ref="doThirdPointcut" throwing="ex"/>
        <aop:after method="after" pointcut-ref="doThirdPointcut"/>
    </aop:aspect>

</aop:config>



测试类：

public class test5aspect {
    @Test
    public void t2(){
        ApplicationContext context=new ClassPathXmlApplicationContext("applicationContextday05aspect.xml");
        SomeService proxyService =(SomeService) context.getBean("service");
        try {
            proxyService.doSome();
        }catch (Exception e){

        }
        proxyService.doAny();
    }
    @Test
    public void t3(){
        ApplicationContext context=new ClassPathXmlApplicationContext("applicationContextday05aspect.xml");
        SomeService1 proxyService =(SomeService1) context.getBean("service");
        proxyService.doFirst();
        proxyService.doSecond();
        try {
            proxyService.doThird();
        }catch (Exception e){

        }
    }
}