1：将业务逻辑类和切面类都添加到容器中：并告诉spring那个是切面类（在类上添加@aspect注解）
2：在切面类上添加@EnableAspectJAutoProxy注解，开启使用aop
然后就是具体的代码：
实现一个计算器，在每次计算都需要在计算前打印传入参数，计算后打印计算结束，计算完成打印返回结果，产生异常打印异常信息。
业务逻辑类：
public class Calculator {public int div(int x, int y){return x/y;}public int mul(int x, int y){return x * y;}}
切面类：
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.*;import java.util.Arrays;@Aspect
public class LogCalculator {@Pointcut("execution(* com.annotation.aop.Calculator.*(..))")public void pointCut(){}@Before(value = "pointCut()")public void logStart(JoinPoint joinPoint){System.out.println("运行"+ joinPoint.getSignature().getName() +"结束，参数列表是" + Arrays.asList(joinPoint.getArgs()));}@After("com.annotation.aop.LogCalculator.pointCut()")public void logEnd(JoinPoint joinPoint){System.out.println("运行"+ joinPoint.getSignature().getName() + "结束");}@AfterReturning(value = "pointCut()",returning = "result")public void logReturning(JoinPoint joinPoint,Object result){System.out.println("运行" + joinPoint.getSignature().getName() + "结束,返回值为" + result);}//JoinPoint必须出现在参数的第一位@AfterThrowing(value = "pointCut()",throwing = "e")public void logThrowing(JoinPoint joinpoint, Exception e){System.out.println("运行" + joinpoint.getSignature().getName() + "时-->" + e.getMessage());}}