我有下面的aspectj示例，作为“helloworld”风格的概念证明。中的通知代码 StyleAspect 似乎执行了两次，即使实际的代码 SomeClass 只执行一次（根据需要）。
代码如下：
首先，一个名为withstyle的注解：

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

然后，一个方面拦截带有@withstyle注解的任何代码

@Aspect
public class StyleAspect {

    @Around("@annotation(WithStyle)")
    public Object doItWithStyle(ProceedingJoinPoint pjp) throws Throwable {
        System.out.println("Doing it in style...");
        Object result = pjp.proceed();
        System.out.println("Done");

        return result;
    }
}

最后，一些带有注解的代码

public class SomeClass {

    @WithStyle
    public void doIt() {
        System.out.println("I'm doing it....");
    }
}

当我运行这个时，我得到以下输出：

--- exec-maven-plugin:1.2.1:exec (default-cli) @ AspectJTest ---
Doing it in style...
Doing it in style...
I'm doing it....
Done
Done

因此，似乎代码本身只执行一次，而方面中的代码执行了两次。
电话号码如下：

public class Main {

    public static void main(String[] args) {
        SomeClass someClass = new SomeClass();
        someClass.doIt();
    }
}

为了完整起见，我将pom与aspectj插件配置结合起来

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>ie.philb</groupId>
    <artifactId>AspectJTest</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <project.build.java.target>1.8</project.build.java.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjrt</artifactId>
            <version>1.9.6</version>
        </dependency>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.9.6</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.codehaus.mojo</groupId>
                <artifactId>aspectj-maven-plugin</artifactId>
                <version>1.11</version>
                <configuration>
                    <complianceLevel>1.8</complianceLevel>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
                <executions>
                    <execution>
                        <goals>
                            <goal>compile</goal>       <!-- use this goal to weave all your main classes -->
                            <goal>test-compile</goal>  <!-- use this goal to weave all your test classes -->
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

</project>