Spring AOP @DeclareParents

Question

有条件地创建一个方面的方法是什么？我想要的是有条件地使用Spring扩展类：

@Aspect
public class Test1Aspect {
    @DeclareParents(value="com.test.testClass",defaultImpl=Test1Impl.class)
    public ITest iTest;
}

@Aspect
public class Test2Aspect {
    @DeclareParents(value="com.test.testClass",defaultImpl=Test2Impl.class)
    public ITest iTest;
}

因此，testClass根据我设置该选项的属性文件扩展Test1Impl或Test2Impl，它可能吗？如何排除被调用的方面，我尝试使用aspectj plugin，但它并不排除我的方面：

pom.xml

<plugin>
    <groupId>org.codehaus.mojo</groupId>
    <artifactId>aspectj-maven-plugin</artifactId>
    <version>1.5</version>
    <configuration>
        <sources>
            <source>
                <basedir>src/main/java</basedir>
                <excludes>
                    <exclude>**/*.java</exclude>
                </excludes>
            </source>
        </sources>
    </configuration>
    <executions>
        <execution>
            <goals>
                <!-- use this goal to weave all your main classes -->
                <goal>compile</goal>
            </goals>
        </execution>
    </executions>
</plugin>

编辑

我删除了aspectj plugin，只使用Spring，下面是配置和测试方面：

Aplication.java

@Configuration
@ComponentScan(basePackages= {
        "demo"
        //"demo.aspect"
})
@EnableAutoConfiguration(exclude=AopAutoConfiguration.class)
//@EnableLoadTimeWeaving(aspectjWeaving=AspectJWeaving.ENABLED)
@EnableAspectJAutoProxy
public class Application {

    public static final Logger LOGGER = LogManager.getLogger(Application.class);

    @Bean
    public testService testService() {
        return new testService();
    }

    @Bean
    @Conditional(TestCondition.class) //CLASS THAT ONLY RETURNS TRUE OR FALSE
    public TestAspect testAspect() {
        LOGGER.info("TEST ASPECT BEAN");
        TestAspect aspect = Aspects.aspectOf(TestAspect.class);
        return aspect;
    }

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

TestAspect

//@Component
//@Profile("asdasd")
//@Configurable
//@Configuration
@Aspect
public class TestAspect{
    public static final Logger LOGGER = LogManager.getLogger(TestAspect.class);

    @Autowired
    private testService testService;

    public TestAspect() {
        LOGGER.info("TEST ASPECT INITIALIZED");
    }

    @Around("execution(* demo.testControllerEX.test(*))")
    public String prevent(ProceedingJoinPoint point) throws Throwable{
        LOGGER.info("ASPECT AROUND " + testService); // ALWAYS CALLED NO MATTER IF THE CONDITION IS FALSE, THE ONLY DIFFERENCE IS THAT testService IS NULL WHEN THE CONDITION IS FALSE.
        String result = (String)point.proceed();
        return result;
    }

    /*@DeclareParents(value="(demo.testControllerEX)",defaultImpl=TestControllersImpl.class)
    private ITestControllerEX itestControllerEX;*/
}

Answer 1

最后，我找到了解决方案，主要问题是，在我的Eclipse中，我在Spring的选项菜单(右键单击项目)中启用了方面工具，并且在Spring之前以某种方式使用传统的Aspectj编译了我的方面，所以这就解释了为什么无论我在方面上使用哪个条件都总是被应用。

因此，解决方案是不启用Spring工具。或者，如果启用了，请右击项目AspectJ Tools ->删除AspectJ功能。

Answer 2

您可以在xml定义文件中使用@Conditional注释或使用PropertySourcesPlaceholderConfigurer。

例如，对于xml

test.aspect = org.example.Test1Aspect

<context:property-placeholder location="configuration.properties" /> 
<bean id="testAspect" class="${test.aspect}" />

您不需要Spring的maven aspectj插件。