使用ProxyFactoryBean時出現異常

Question

我正在嘗試實現ProxyFactoryBean來創建AOP代理，但是會出現一些錯誤。 有誰能告訴我哪里出錯了。

Perfomer.java

    public interface Performer {
        public void perform();
    }

Juggler.java

    public class Juggler implements Performer {
        private int beanBags;
        public Juggler(){
            beanBags =3;
        }
        public Juggler (int beanBags){
            this.beanBags=beanBags;
        }
        @Override
        public void perform() {
            System.out.println("Juggling "+beanBags+" BeanBags...");            
        }
    }

Audience.java

    @Aspect
    public class Audience{
        @Pointcut("execution(* com.org.Performer.perform(..))")
        public void performance(){}

        @Before("performance()")
        public void takeSeats(){
            System.out.println("The audience is taking their seats.");
        }
        @Before("performance()")
        public void turnOffCellPhones(){
            System.out.println("The audience is turning off their cellphones.");
        }
        @AfterReturning("performance()")
        public void applaud(){
            System.out.println("CLAP CLAP CLAP CLAP CLAP");
        }
        @AfterThrowing("performance()")
        public void demandRefund(){
            System.out.println("Boo! We want our money back!");
        }
        @After("performance()")
        public void goHome(){
            System.out.println("The audience is going home!");
        }
        @Around("performance()")
        public void watchTime(ProceedingJoinPoint joinPoint){
            try{
                long startTime=System.currentTimeMillis();
                joinPoint.proceed();
                long endTime=System.currentTimeMillis();
                System.out.println("Time taken: "+(endTime-startTime));
            }
            catch (Throwable t){t.printStackTrace();}
        }
    }

TestClass.java

    public class TestClass {
        public static void main(String args[]) {
            ApplicationContext applicationContext=new ClassPathXmlApplicationContext("spring-config.xml");

            Performer performer=(Performer)applicationContext.getBean("proxyDuke");
            performer.perform();   
        }
    }

春天-config.xml中

<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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">

    <bean id="Duke" class="com.org.Juggler" ><constructor-arg value="15" /></bean>
    <bean id="audience" class="com.org.Audience"/>

    <bean id="debugInterceptor" class="org.springframework.aop.interceptor.DebugInterceptor"/>

        <bean id="proxyDuke" class="org.springframework.aop.framework.ProxyFactoryBean">
            <property name="target" ref="Duke"/>
            <property name="interceptorNames">
                <list>
                    <value>audience</value>
                    <value>debugInterceptor</value>
                </list>
            </property>
        </bean>
         <aop:scoped-proxy proxy-target-class="false" />
    </beans>

但是給出以下例外

例外：

Exception in thread "main" org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: Cannot locate BeanDefinitionParser for element [scoped-proxy]
Offending resource: class path resource [spring-config.xml]
    at org.springframework.beans.factory.parsing.FailFastProblemReporter.fatal(FailFastProblemReporter.java:59)
    at org.springframework.beans.factory.parsing.ReaderContext.fatal(ReaderContext.java:68)
    at org.springframework.beans.factory.parsing.ReaderContext.fatal(ReaderContext.java:55)
    at org.springframework.beans.factory.xml.NamespaceHandlerSupport.findParserForElement(NamespaceHandlerSupport.java:84)
    at org.springframework.beans.factory.xml.NamespaceHandlerSupport.parse(NamespaceHandlerSupport.java:73)
    at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1419)
    at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1409)
    at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:184)
    at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.doRegisterBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:140)
    at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.registerBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:111)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.registerBeanDefinitions(XmlBeanDefinitionReader.java:493)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:390)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:334)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:302)
    at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:174)
    at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:209)
    at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:180)
    at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:243)
    at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:127)
    at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:93)
    at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:131)
    at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:522)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:436)
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
    at com.org.TestClass.main(TestClass.java:15)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)

Answer 1

作為初始刺戳檢查，當您運行測試時，您的類路徑上有spring-aop jar。 如果你看一下org.springframework.aop.config.AopNamespaceHandler中的init方法，它是aop命名空間的默認處理程序，它會為'scoped-proxy'注冊處理程序。

HTH！

詹姆士

附錄：查看更詳細的問題后，您無法指定：

 <aop:scoped-proxy proxy-target-class="false" /> 

作為獨立元素。 它需要在bean定義中，即：

<bean id="Duke" class="com.org.Juggler">
    <constructor-arg value="15" />
    <aop:scoped-proxy proxy-target-class="false" />
</bean>

如果您不希望任何bean成為cglib代理，那么使用：

<aop:config proxy-target-class="false" />

還有其他問題，因為在為ProxyFactoryBean指定攔截器名稱時，它們必須是Adience，Advisor，Interceptor等類型，而Audience不是。 如果您可以省略調試攔截器bean，那么您只需要定義以下內容：

<bean id="Duke" class="com.org.Juggler">
    <constructor-arg value="15" />
</bean>
<bean id="audience" class="com.org.Audience" />
<aop:aspectj-autoproxy proxy-target-class="false" />    

最后一行<aop:aspectj-autoproxy..... />將檢查定義的類中的注釋和自動代理Juggler。

最后，您需要更改代碼，以便檢索“Duke”而不是代理，即。

Performer performer = (Performer)applicationContext.getBean("Duke");
performer.perform();