Spring 2.0中 AOP的编程

Spring 2.0中 AOP的编程

 

Spring 2.0中 AOP的编程：

方式一：

publicclass User {

    publicvoid method() {

        System.out.println("in method1");

    }

}

publicclass LogBean {

    public Object aroundLogCalls(ProceedingJoinPoint joinPoint) throws Throwable {

        System.out.println("before invoke method:"

                     + joinPoint.getSignature().getName());

        Object object = joinPoint.proceed();

        System.out.println("after invoke method:"

                     + joinPoint.getSignature().getName());

        return object;

    }

 

}

采用在xml配置aop:

<?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"

    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">

<!-- 注意上面的四个地址用空格分开 -->

<aop:config>

       <!-- expression 表示要执行的匹配表达式，这里匹配所有的public方法，但是去除logger类的所有方法，防止无限调用-->

 

       <aop:pointcut id="loggableCalls"

           expression="execution(public * *(..)) "/>

 

 

       <aop:aspect id="logAspect" ref="logBean">

           <aop:around pointcut-ref="loggableCalls"

              method="aroundLogCalls" />

       </aop:aspect>

 

    </aop:config>

    <bean id="logBean" class="LogBean" />

    <bean id="user" class="User" />

方式二：

采用标注：

@Aspect

publicclass LogAspect {

 

    @Pointcut("execution(public * *(..))")

    publicvoid publicMethods() {

    }

    @Around("publicMethods()")

    public Object aroundLogCalls(ProceedingJoinPoint joinPoint)

           throws Throwable {

       System.out.println("before invoke method:"

              + joinPoint.getSignature().getName());

       Object object = joinPoint.proceed();

       System.out.println("after invoke method:"

              + joinPoint.getSignature().getName());

       return object;

    }

}

<?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"

    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">

<!-- 注意上面的四个地址用空格分开 -->

 

    <aop:aspectj-autoproxy />

 

    <!-- 或者使用以下定义

             

       <bean class="org.springframework.aop.aspectj.annotation.AnnotationAwareAspectJAutoProxyCreator" />

      

    -->

    <bean id="logAspect" class="LogAspect" />

    <bean id="user" class="User" />

 

</beans>

这样配置文件就就只有一个<aop:aspectj-autoproxy />很简单。

出现的问题解决：

问题1：Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory at org.springframework.util.ClassUtils.<clinit>(ClassUtils.java:67)   at org.springframework.core.io.DefaultResourceLoader.<init>(DefaultResourceLoader.java:52) at org.springframework.context.support.AbstractApplicationContext.<init>(AbstractApplicationContext.java:184) at org.springframework.context.support.AbstractRefreshableApplicationContext.<init>(AbstractRefreshableApplicationContext.java:80) at org.springframework.context.support.AbstractXmlApplicationContext.<init>(AbstractXmlApplicationContext.java:58)   at

需要加上：commons-logging.jar log4j-1.2.11.jar

 

问题2：Exception in thread "main" org.springframework.beans.factory.BeanDefinitionStoreException: Unexpected exception parsing XML document from class path resource [text.xml]; nested exception is java.lang.NoClassDefFoundError: org/aspectj/weaver/reflect/ReflectionWorld$ReflectionWorldException

Caused by: java.lang.NoClassDefFoundError: org/aspectj/weaver/reflect/ReflectionWorld$ReflectionWorldException

    at java.lang.Class.forName0(Native Method)

 

需要加上：aspectjweaver.jar

 

问题3：Exception in thread "main" org.springframework.beans.factory.BeanCreationException:Error creating bean with name 'logBean' defined in class path resource[text.xml]: Initialization of bean failed; nested exception is org.springframework.aop.framework.AopConfigException: Cannot proxy target class because CGLIB2 is not available. Add CGLIB to the class path or specify proxy interfaces.

Caused by: org.springframework.aop.framework.AopConfigException: Cannot proxy target class because CGLIB2 is not available. Add CGLIB to the class path or specify proxy interfaces.

需要加上：cglib-2.1.3.jar

 

 

问题4：xception in thread "main" org.springframework.beans.factory.BeanCreationException:Error creating bean with name 'logBean' defined in class path resource[text.xml]: Initialization of bean failed; nested exception is java.lang.NoClassDefFoundError: org/objectweb/asm/Type

Caused by: java.lang.NoClassDefFoundError: org/objectweb/asm/Type

    at net.sf.cglib.core.TypeUtils.parseType(TypeUtils.java:180)

需要加上：asm.jar