阿航

2021年5月12日

2

Spring Boot AOP 获取注解中的值

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface MyAnnotation {

    /**
     * 注解值(等下要获取并处理该值)
     * @return
     */
    String value() default "";

}

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.reflect.MethodSignature;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;

@Aspect
@Component
public class MyAnnotationAspect {

    protected static final Logger logger = LoggerFactory.getLogger(MyAnnotationAspect.class);

    // TODO 注意这里需要替换为你的注解路径
    @Around("@annotation(com.example.demo.MyAnnotation)")
    public Object doSomething(ProceedingJoinPoint point) throws Throwable {

        MethodSignature signature = (MethodSignature) point.getSignature();
        Method signatureMethod = signature.getMethod();

        MyAnnotation myAnnotation = signatureMethod.getAnnotation(MyAnnotation.class);

        String value = myAnnotation.value();

        // 这里就可以打印你的注解值了
        System.out.println(value);

        return point.proceed();
    }

}

import com.example.demo.aop2.aop.MyAnnotation;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
public class TestController {

    // 这里添加我们定义的注解
    @MyAnnotation(value = "123456")
    @RequestMapping(value = "/hello", method = RequestMethod.POST)
    public @ResponseBody
    String demo() {
        return "hello";
    }

}