springboot 做切面

1. 引入依赖

<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-aop -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-aop</artifactId>
            
        </dependency>

2.书写目标方法

@Component  //放入容器
public class User {

    
    public String eat(String food) {
        System.out.println("吃"+food);
        return "吃饱了";
    }

}

3.书写切面类和方法

@Aspect
@Component
public class CutPoint {

    /**
     * 声明一个切面
     */
    
    @Pointcut(value ="execution(* com.example.domain.*.*(..))" )
    public void pc() {
        
    }
    
    @Before(value = "pc()")
    public void before() {
        System.out.println("饭前水果");
        
    }
    
    @After(value="pc()")
    public void after() {
        System.out.println("饭后来一根烟");
    }
    
    @Around(value = "pc()")
    public void arroud(ProceedingJoinPoint joinPoint) {
        try {
            Object[] args = joinPoint.getArgs();  // 获取参数
            for (Object object : args) {
                System.out.println(object);
            }
            
            before();
            joinPoint.proceed();   //执行原方法
            Object proceed = joinPoint.proceed();  //获取返回值
            System.out.println(proceed);
            after();
        } catch (Throwable e) {
            
            e.printStackTrace();
        }
    }
    
    
    @AfterThrowing(value="pc()",throwing = "tw")
    public void error(Throwable tw) {
        System.out.println("目标出现异常！");     //捕获异常
    }
}