SpringBootWeb 篇-深入了解 AOP 面向切面编程与 AOP 记录操作日志案例

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
 
@Aspect
@Component
public class LoggingAspect {
    private static final Logger logger = LoggerFactory.getLogger(LoggingAspect.class);
 
    @Pointcut("execution(* com.example.demo.controller..*.*(..))")
    public void controllerLogging(){}
 
    @Before("controllerLogging()")
    public void doBefore(JoinPoint joinPoint) {
        logger.info("Method: " + joinPoint.getSignature().getName());
    }
 
    @AfterReturning(pointcut = "controllerLogging()", returning = "result")
    public void doAfterReturning(Object result) {
        logger.info("Result: " + result);
    }
 
    @AfterThrowing(pointcut = "controllerLogging()", throwing = "e")
    public void doAfterThrowing(Exception e) {
        logger.error("Exception: " + e.getMessage());
    }
 
    @Around("controllerLogging()")
    public Object doAround(ProceedingJoinPoint joinPoint) throws Throwable {
        logger.info("Entering method: " + joinPoint.getSignature().getName());
        Object result = joinPoint.proceed();
        logger.info("Exiting method: " + joinPoint.getSignature().getName());
        return result;
    }
}

这段代码定义了一个日志切面，用于记录 Spring Boot 控制层（com.example.demo.controller包及其子包中的所有方法）的操作日志。它使用了@Pointcut注解来定义一个切点，即要被日志切面处理的方法。然后，它使用了@Before、@AfterReturning、@AfterThrowing和@Around注解来定义不同类型的通知。这些通知方法会在目标方法执行前、执行后以及出现异常时被调用，从而实现了日志记录的功能。