Spring AOP面向切面源码解析

柔情只为你懂 2023-02-11 10:15 44阅读 0赞

### IoC 和 AOP 被称为 Spring 两大基础模块 ###

AOP(Aspect-Oriented Programming) 在程序设计领域拥有其不可替代的适用场景和地位。Spring AOP 作为 AOP 思想的实现

public interface IService { 
        void sayHello();
        void sayHelloTo(String name);
        void sayByebye();
        void sayByebyeTo(String name);
    }
    
    @Service
    public class ServiceImpl implements IService { 
    
        @Override
        public void sayHello() { 
            this.sayHelloTo("zhenchao");
        }
    
        @Override
        public void sayHelloTo(String name) { 
            System.out.println("hello, " + name);
        }
    
        @Override
        public void sayByebye() { 
            this.sayByebyeTo("zhenchao");
        }
    
        @Override
        public void sayByebyeTo(String name) { 
            System.out.println("byebye, " + name);
        }
    
    }

### 1.Spring AOP 实现对方法调用 ###

@Aspect
    @Component
    public class MetricAspect { 
    
        @Before("execution(* sayHello*(..))")
        public void beforeMetrics4sayHello(JoinPoint point) { 
            System.out.println("[BEFORE] metrics for method: " + point.getSignature().getName());
        }
    
        @Around("execution(* say*(..))")
        public Object aroundMetrics4say(ProceedingJoinPoint point) throws Throwable { 
            System.out.println("[AROUND] before metrics for method: " + point.getSignature().getName());
            Object obj = point.proceed();
            System.out.println("[AROUND] after metrics for method: " + point.getSignature().getName());
            return obj;
        }
    
        @After("execution(* sayByebye*(..))")
        public void afterMetrics4sayByebye(JoinPoint point) { 
            System.out.println("[AFTER] metrics for method: " + point.getSignature().getName());
        }
    
    }