Spring 2.0中 AOP的编程

Spring 2.0中 AOP的编程

 [align=left]Spring 2.0中 AOP的编程：[/align][align=left]方式一：[/align][align=left]publicclass User {[/align][align=left]    publicvoid method() {[/align][align=left]        System.out.println("in method1");[/align][align=left]    }[/align][align=left]}[/align][align=left]publicclass LogBean {[/align][align=left]    public Object aroundLogCalls(ProceedingJoinPoint joinPoint) throws Throwable {[/align][align=left]        System.out.println("before invoke method:"[/align][align=left]                     + joinPoint.getSignature().getName());[/align][align=left]        Object object = joinPoint.proceed();[/align][align=left]        System.out.println("after invoke method:"[/align][align=left]                     + joinPoint.getSignature().getName());[/align][align=left]        return object;[/align][align=left]    }[/align][align=left] [/align][align=left]}[/align][align=left]采用在xml配置aop:[/align][align=left]<?xml version="1.0" encoding="UTF-8"?>[/align][align=left]<beans xmlns="http://www.springframework.org/schema/beans"[/align][align=left]    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"[/align][align=left]    xmlns:aop="http://www.springframework.org/schema/aop"[/align][align=left]    xsi:schemaLocation="[/align][align=left]http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd   [/align][align=left]   http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">[/align][align=left]<!-- 注意上面的四个地址用空格分开 --> [/align]<aop:config>[align=left]       <!-- 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-->[/align][align=left] [/align][align=left]       <aop:pointcut id="loggableCalls"[/align][align=left]           expression="execution(public * *(..)) "/>[/align][align=left] [/align][align=left] [/align][align=left]       <aop:aspect id="logAspect" ref="logBean">[/align][align=left]           <aop:around pointcut-ref="loggableCalls"[/align][align=left]              method="aroundLogCalls" />[/align][align=left]       </aop:aspect>[/align][align=left] [/align][align=left]    </aop:config>[/align][align=left]    <bean id="logBean" class="LogBean" />[/align][align=left]    <bean id="user" class="User" />[/align][align=left]方式二：[/align][align=left]采用标注：[/align][align=left]@Aspect[/align][align=left]publicclass LogAspect {[/align][align=left] [/align][align=left]    @Pointcut("execution(public * *(..))")[/align][align=left]    publicvoid publicMethods() {[/align][align=left]    }[/align][align=left]    @Around("publicMethods()")[/align][align=left]    public Object aroundLogCalls(ProceedingJoinPoint joinPoint)[/align][align=left]           throws Throwable {[/align][align=left]       System.out.println("before invoke method:"[/align][align=left]              + joinPoint.getSignature().getName());[/align][align=left]       Object object = joinPoint.proceed();[/align][align=left]       System.out.println("after invoke method:"[/align][align=left]              + joinPoint.getSignature().getName());[/align][align=left]       return object;[/align][align=left]    }[/align][align=left]}[/align][align=left]<?xml version="1.0" encoding="UTF-8"?>[/align][align=left]<beans xmlns="http://www.springframework.org/schema/beans"[/align][align=left]    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"[/align][align=left]    xmlns:aop="http://www.springframework.org/schema/aop"[/align][align=left]    xsi:schemaLocation="[/align][align=left]http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd   [/align][align=left]   http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">[/align][align=left]<!-- 注意上面的四个地址用空格分开 -->[/align][align=left] [/align][align=left]    <aop:aspectj-autoproxy />[/align][align=left] [/align][align=left]    <!-- 或者使用以下定义[/align][align=left]              [/align][align=left]       <bean class="org.springframework.aop.aspectj.annotation.AnnotationAwareAspectJAutoProxyCreator" />[/align][align=left]       [/align][align=left]    -->[/align][align=left]    <bean id="logAspect" class="LogAspect" />[/align][align=left]    <bean id="user" class="User" />[/align][align=left] [/align][align=left]</beans>[/align][align=left]这样配置文件就就只有一个<aop:aspectj-autoproxy />很简单。[/align][align=left]出现的问题解决：[/align][align=left]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 [/align][align=left]需要加上：commons-logging.jar log4j-1.2.11.jar[/align][align=left] [/align]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$ReflectionWorldException[align=left]Caused by: java.lang.NoClassDefFoundError: org/aspectj/weaver/reflect/ReflectionWorld$ReflectionWorldException[/align]    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.[align=left]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.[/align][align=left]需要加上：cglib-2.1.3.jar[/align][align=left] [/align][align=left] [/align]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[align=left]Caused by: java.lang.NoClassDefFoundError: org/objectweb/asm/Type[/align][align=left]    at net.sf.cglib.core.TypeUtils.parseType(TypeUtils.java:180)[/align][align=left]需要加上：asm.jar[/align]