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Spring中使用注解方式实现AOP，采用@AspectJ方式实现，首先确定需要切入的方法，也就是连接点
@Service
public class UserServiceMethod {public void add(String name) {System.out.println("UserServiceMethod add name is:" + name);}
}
开发切面
有了连接点，还需要切面通过切面描述AOP其他信息，来描述流程的织入
@Aspect
@Component
public class LogAgent {@Before("execution(* com.niu.dao.UserServiceMethod.add(..))")public void beforeAdd(JoinPoint joinPoint) {MethodSignature signature = (MethodSignature) joinPoint.getSignature();Method method = signature.getMethod();System.out.println("before 方法规则拦截：" + method.getName());}@After("execution(* com.niu.dao.UserServiceMethod.add(..))")public void afterAdd(JoinPoint joinPoint) {MethodSignature signature = (MethodSignature) joinPoint.getSignature();Method method = signature.getMethod();System.out.println("after 方法规则拦截：" + method.getName());}@AfterReturning("execution(* com.niu.dao.UserServiceMethod.add(..))")public void afterReturnAdd(JoinPoint joinPoint) {MethodSignature signature = (MethodSignature) joinPoint.getSignature();Method method = signature.getMethod();System.out.println("afterReturn 方法规则拦截：" + method.getName());}@AfterThrowing("execution(* com.niu.dao.UserServiceMethod.add(..))")public void afterThrowsAdd(JoinPoint joinPoint) {MethodSignature signature = (MethodSignature) joinPoint.getSignature();Method method = signature.getMethod();System.out.println("afterThrows 方法规则拦截：" + method.getName());}
}
其中注解中execution(* com.niu.dao.UserServiceMethod.add(…))是正则匹配，
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