Spring 2.0中 AOP的编程

Spring 2.0 中 AOP 的编程：

方式一：

public class User {

    public void method () {

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

    }

}

public class 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

public class LogAspect {

 

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

    public void 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