| 注解 |
简述 |
| @EnableAspectJAutoProxy |
开启注解切面 |
| @Aspect |
标识当前类为切面类 |
| @Pointcut |
切入点, 符合规则的类才会生成代理对象 |
| @Before |
前置增强 |
| @Around |
环绕增强，调用被代理对象方法需要自行控制 |
| @After |
后置增强，不管是抛出异常或者正常退出都会执行 |
| @AfterReturning |
后置增强，异常不执行 |
| @AfterThrowing |
后置增强，抛出异常时执行 |
@EnableAspectJAutoProxy 属性 proxyTargetClass
true 使用CGLIB代理机制
false
1、目标对象实现了接口 – 使用JDK动态代理机制
2、目标对象没有接口(只有实现类) – 使用CGLIB代理机制
使用案例
@Component
@Aspect
public class AspectAnnotation {
/*
* introduction 引介动态添加功能，并且改变目标类的类型，其实就是目标类多实现了接口而已
* */
@DeclareParents(value = "com.xiangxue.jack.service1.BankServiceImpl",
defaultImpl = com.xiangxue.jack.service.DataCheckImpl.class)
private DataCheck dataCheck;
@Pointcut("execution(public * com.xiangxue.jack.service.*.*(..))")
public void pc1(){}
@Pointcut("execution(public * com.xiangxue.jack.service.*.add*(..))")
public void pc2(){}
@Pointcut("execution(public * com.xiangxue.jack.service1.*.*(..))")
public void pc3(){}
@Before("pc2()")
public void before() {
System.out.println("===============只拦截add方法=========");
}
@Around("pc1()")
public Object around(ProceedingJoinPoint joinPoint) throws Throwable {
System.out.println("==============AspectAnnotation around前置通知=========");
Object result = joinPoint.proceed();
System.out.println("==============AspectAnnotation around后置通知=========");
return result;
}
@Before("pc3()")
public void before1(JoinPoint joinPoint) {
Signature signature = joinPoint.getSignature();
Object[] args = joinPoint.getArgs();
System.out.println("===============service1包的拦截=========");
}
@Before("pc3()&&args(bankId,id,list)")
public void before2(String bankId,Integer id,List list) {
System.out.println("===============service1包的拦截=========");
}
@Before(value = "@annotation(targetMethod)",argNames = "joinPoint,targetMethod")
public void xx(JoinPoint joinPoint, TargetMethod targetMethod) {
System.out.println("===============注解拦截 前置通知=========");
System.out.println("==================targetMethod.name = " + targetMethod.name());
}
@AfterReturning(value = "@annotation(returnValue)",returning = "retVal")
public void afterReturning(JoinPoint joinPoint, ReturnValue returnValue, Object retVal) {
System.out.println("==============AspectAnnotation 后置通知 拿返回值=========" + retVal);
}
@AfterThrowing(value = "@annotation(throwsAnno)",throwing = "e")
public void throwMethod(JoinPoint joinPoint, ThrowsAnno throwsAnno, Throwable e) {
System.out.println("==============AspectAnnotation 异常通知 拿异常=========" + e);
}
}
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