Spring AOP xml配置不起作用

Question

I tried to write a simple AOP program and I configure the xml file like below. But when I ran the program, the result seems not calling the advice but only execute non-advice part.

Here is the method class:

public class MessageWriterStdOut {
    public void writeMessage() {
        System.out.print("World");
    }
} 

This is the bean class:

public class MyBeanOfHelloWorld {
  private MessageWriterStdOut messageWriterStdOut;
    public void execute() {
        messageWriterStdOut.writeMessage();
    }
    public void setMessageWriterStdOut(MessageWriterStdOut messageWriterStdOut) {
        this.messageWriterStdOut = messageWriterStdOut;
    }
}

The advice class is like this:

public class MessageDecorator implements MethodInterceptor {
    @Override
    public Object invoke(MethodInvocation invocation) throws Throwable {
        System.out.print("Hello ");
        Object retVal = invocation.proceed();
        System.out.println("!");
        return retVal;
    }
}

The main method is :

public class HelloWorldAopExample {
    public static void main(String[] args) {
        GenericXmlApplicationContext ctx = new GenericXmlApplicationContext();
        ctx.load("/META-INF/spring/context-aop.xml");
        ctx.refresh();
        MyBeanOfHelloWorld myBeanOfHelloWorld = (MyBeanOfHelloWorld) ctx.getBean("myBeanOfHelloWorld");
        myBeanOfHelloWorld.execute();
    }
}

and the xml configuration is :

<aop:config>
        <aop:pointcut id="helloExecution"
            expression="execution(* com..playground..writeMessage*()) and args(invocation)" />
        <aop:aspect ref="advice">
            <aop:around pointcut-ref="helloExecution" method="invoke" />
        </aop:aspect>
    </aop:config>
    <bean id="advice" class="com..playground.aophelloworld.MessageDecorator" />
    <bean id="messageWriterStdOut"
        class="com..playground.aophelloworld.MessageWriterStdOut" />
    <bean id="myBeanOfHelloWorld" class="com..playground.aophelloworld.MyBeanOfHelloWorld">
        <property name="messageWriterStdOut" ref="messageWriterStdOut" />
    </bean>

But the result is still only "world", while the expected result is "hello world!"

Answer 1

In the xml configuration, why some of your package paths are having two dots? For example:

<aop:pointcut id="helloExecution"
        expression="execution(* com..playground..writeMessage*()) and args(invocation)" />

should be:

<aop:pointcut id="helloExecution"
        expression="execution(* com.playground.writeMessage*()) and args(invocation)" />

and some other places:

<bean id="advice" class="com.playground.aophelloworld.MessageDecorator" />
<bean id="myBeanOfHelloWorld" class="com.playground.aophelloworld.MyBeanOfHelloWorld">
    <property name="messageWriterStdOut" ref="messageWriterStdOut" />

Updated: Can you try this:

<aop:pointcut id="helloExecution"
        expression="execution(* com..playground.MessageWriterStdOut.writeMessage(..))" />