java - 在Spring Boot应用程序中，不执行基于注释的切入点

Question

嗨，我已经创建了 Spring Boot 应用程序，并尝试使用 Spring AOP 应用 Aspect。代码如下...

自定义定时器注释

package org.my.pckg.annotation;

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

TimerLoggingAspect 方面

@Aspect
@Component
public class TimeLoggingAspect {

@Pointcut("annotation(@org.my.pckg.annotation.Timer)")
public void loggingPointCutDefinition(){}

    @Around("loggingPointCutDefinition()")
    public void userAdvice(ProceedingJoinPoint joinPoint) throws Throwable{
        createJsonString(joinPoint);
        joinPoint.proceed();
    }

    private String createJsonString(ProceedingJoinPoint joinPoint) {
    //logic for creating and printing json
        return "";
    }
}

配置类

package org.my.pckg.config;
@Configuration
@EnableAspectJAutoProxy  
@ComponentScan(basePackages =     {"org.my.pckg.utilities","org.my.pckg.annotation"})
public class AssetConfig {

    @Bean
    public TimeLoggingAspect timeLoggingAspect() {
        return new TimeLoggingAspect();
    }
}

示例测试 Controller

package org.my.pckg;
@SpringBootApplication
@PropertySources({
    @PropertySource(value = "classpath:application.properties", ignoreResourceNotFound = true)
})
@Configuration
@ComponentScan(basePackages = {"org.my.pckg.config","org.my.pckg.annotation"})
@RestController
@EnableAutoConfiguration
@EnableAspectJAutoProxy
public class Example {

@Timer
@RequestMapping("/")
String home() {
    return "Hello World!";
}

public static void main(String[] args) throws Exception {
    SpringApplication.run(Example.class, args);
}
}

还有application.properties包含以下内容:

spring.aop.proxy-target-class=true

当我使用上述设置来调试应用程序时:

spring-boot:run "-Drun.jvmArguments=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=5005"

方面未执行，但如果我更改切入点来自@Around("@annotation(org.my.pckg.annotation.Timer)") 至@Around("execution( * org.my.pckg.*.*(..))")效果非常好!

请帮助找出定义自定义注释时缺少的内容..

Answer 1

更改切入点:

@Pointcut("execution(@org.my.pckg.annotation.Timer)")

致:

@Pointcut("@annotation(org.my.pckg.annotation.Timer)")

阅读 Declaring a Pointcut 上的 Spring 文档.