Question

当我使用spring-aspect时 - bean myClass 不会注入。为什么可能，以及如何在这种情况下启用注射呢？

如果 aop：config 在XML中被注释掉，则输出为：

myClass from constructor: MyClass{myInt=3333}
myClass from main: MyClass{myInt=3333}
app logEvent

如果 aop：config 在XML中被注释掉 NOT ，则输出为：

myClass from constructor: MyClass{myInt=3333}
myClass from main: null
LOG: BEFORE : App logEvent
app logEvent

App.java

public class App {
    MyClass myClass;

    public static void main(String[] args) {
        ApplicationContext ctx;
        ctx = new ClassPathXmlApplicationContext("conf.xml");
        App app = (App) ctx.getBean("app");

        System.out.println("myClass from main: " + app.myClass);
        app.logEvent();
    }

    public App(MyClass myClass) {
        this.myClass = myClass;
        System.out.println("myClass from constructor: " + this.myClass);
    }

    public void logEvent(){
        System.out.println("app logEvent");
    }
}

MyClass.java

public class MyClass {
    int myInt=6789;

    public int getMyInt() {return myInt;}

    public void setMyInt(int myInt) {this.myInt = myInt;}

    @Override
    public String toString() {return "MyClass{myInt=" + myInt +'}'; }
}

MyAspect.java

public class MyAspect {
    public void logBefore(JoinPoint joinPoint) {
        System.out.println("LOG: BEFORE : " +
                joinPoint.getTarget()
                        .getClass().getSimpleName() + " " +
                joinPoint.getSignature()
                        .getName()
        );
    }
}

conf.xml中

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop"
   xmlns:c="http://www.springframework.org/schema/c" xmlns:p="http://www.springframework.org/schema/p"
   xmlns:context="http://www.springframework.org/schema/context"
   xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

<bean id="app" class="com.geka.spring2.App" c:myClass-ref="myClass"/>
<bean id="myClass" class="com.geka.spring2.MyClass" p:myInt="3333" />

<bean id="aBean" class="com.geka.spring2.MyAspect"  />

<aop:aspectj-autoproxy />

<aop:config>
    <aop:aspect id="myAspect" ref="aBean">
        <aop:pointcut id="cLogg" expression="execution(* *.logEvent(..))"/>
        <aop:before pointcut-ref="cLogg" method="logBefore"/>
    </aop:aspect>
</aop:config>

Answer 1

MyClass似乎不是@Component，因此可能无法在ComponentScan中找到

Answer 2

一切都变得更简单了。 Spring AOP代理不代理字段

当我使用方面 - bean没有注入

2 个答案: