SpringBoot自定义注解

利用AOP自定义注解能在很多时候很好的解耦代码

1. 完善pom文件

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-aop</artifactId>
        </dependency>

2. 自定义注解

/**
 * @author guoxy
 */
@Retention(RetentionPolicy.RUNTIME)
@Target({ ElementType.METHOD, ElementType.TYPE })
public @interface DoSomething {
    String key();
    String value();
    boolean test() default false;
}

3. 制定切点

@Aspect
@Component
public class AnnotationImpl {
    @Pointcut("@annotation(com.learn.practice.annotation.DoSomething)")
    public void doSomethingPointCut() {

    }

    @Before("doSomethingPointCut()")
    public void before(JoinPoint joinPoint) {
        MethodSignature sign = (MethodSignature) joinPoint.getSignature();
        Method method = sign.getMethod();
        DoSomething annotation = method.getAnnotation(DoSomething.class);
        System.out.println("this before:"+annotation.key()+":" + annotation.value()+":" + annotation.test());
    }

    @After("doSomethingPointCut()")
    public void after(JoinPoint joinPoint) {
        MethodSignature sign = (MethodSignature) joinPoint.getSignature();
        Method method = sign.getMethod();
        DoSomething annotation = method.getAnnotation(DoSomething.class);
        System.out.println("this after:"+annotation.key()+":" + annotation.value()+":" + annotation.test());
    }
    @Around("doSomethingPointCut()")
    public Object methodAround(ProceedingJoinPoint joinPoint) throws Throwable {
        System.out.println("Around before");
        MethodSignature sign = (MethodSignature) joinPoint.getSignature();
        Method method = sign.getMethod();
        //todo 你可以根据业务逻辑是否调用原来的方法
        Object proceed = joinPoint.proceed();
        System.out.println("Around after");
        return proceed;
    }
}

4. 执行控制层

        /**
 * 测试的控制层
 * @author guoxy
 */
@RestController
@RequestMapping("/test")
public class TestController {
    @GetMapping("/get")
    @DoSomething(key = "aaa",value = "bbb",test = true)
    public String getTest(){
        System.out.println("this is test method");
        return "aaa";
    }
}

5.执行结果

Around before
this before:aaa:bbb:true
this is test method
Around after
this after:aaa:bbb:true

写的不好的地方希望多多指正，多多交流学习，萌新接受一切批评指正！