spring aop的简单实例

spring aop 回顾。一般可用作日志记录，数数据库DAO的性能监控等等。

 

有这样一个业务类的接口

/** * 类BusinessService.java的实现描述：TODO 类实现描述 * * @author xuyunqin 2010-10-25 下午04:54:45 */ public interface BusinessService { public void business(); }

 

这个实现类实现了上面的接口：

/** * 类BusinessServiceImpl.java的实现描述：这是一个主要业务类 * * @author xuyunqin 2010-10-25 下午04:55:40 */ public class BusinessServiceImpl implements BusinessService { @Override public void business() { System.out.println("业务处理，可以引用其他业务bean"); } }

 

现在有增加对上述业务类的权限控制，权限控制类如下：

/** * 类AuthService.java的实现描述：权限类 * * @author xuyunqin 2010-10-25 下午04:57:29 */ public class AuthService { public void auth() { System.out.println("在执行业务前要先执行我，权限类"); } }

 

下面类权限的增强类

/** * 类AuthAdvice.java的实现描述：权限的增强类 * * @author xuyunqin 2010-10-25 下午04:59:55 */ public class AuthAdvice implements MethodBeforeAdvice, AfterReturningAdvice { private AuthService authService; @Override public void before(Method method, Object[] args, Object target) throws Throwable { authService.auth(); } @Override public void afterReturning(Object returnValue, Method method, Object[] args, Object target) throws Throwable { // TODO Auto-generated method stub } public void setAuthService(AuthService authService) { this.authService = authService; } }

 

在spring配置文件中配置如下：

 

权限控制类：

 

<bean id="authService" class="com.winking.spring.aspect.test.AuthService"> </bean> 

 

 权限控制增强类：

 

<bean id="authAdvice" class="com.winking.spring.aspect.test.AuthAdvice"> <property name="authService" ref="authService"></property> </bean> 

 

 权限控制的通知者：

 

<bean id="authAdvisor" class="org.springframework.aop.support.RegexpMethodPointcutAdvisor"> <property name="advice" ref="authAdvice"></property> <property name="pattern" value=".*"></property> </bean> 

 

 

 

 

 

<!-- 代理基础类的父类 -->

<bean id="proxyBaseParent" class="org.springframework.aop.framework.ProxyFactoryBean" abstract="true"> </bean> <bean id="authProxyBase" parent="proxyBaseParent" abstract="true"> <property name="interceptorNames"> <list> <value>authAdvisor</value> </list> </property> </bean> 

 

 

 

<!-- 业务类 -->

<bean id="businessService" class="com.winking.spring.aspect.test.BusinessServiceImpl"> </bean> 

 

 

业务代理类：

 

<bean id="businessServiceProxy" parent="authProxyBase"> <property name="target" ref="businessService"></property> </bean> 

 

测试类：

BusinessService business = (BusinessService) factory.getBean("businessServiceProxy"); business.business(); 

 

下面是用于数据库执行时间的一个切面类：

public class PerformanceInterceptor implements MethodInterceptor{ private static final Logger log = LoggerFactory.getLogger(PerformanceInterceptor.class); private int infoValve = 10; private int warnValve = 50; private int errorValve = 100; private int fatalValve = 200; public void setInfoValve(int debugValve) { this.infoValve = debugValve; } public void setErrorValve(int errorValve) { this.errorValve = errorValve; } public void setFatalValve(int fatalValve) { this.fatalValve = fatalValve; } public void setWarnValve(int warningValve) { this.warnValve = warningValve; } public Object invoke(MethodInvocation methodInvocation) throws Throwable { long startTime = System.currentTimeMillis(); try { return methodInvocation.proceed(); } finally { long time = (System.currentTimeMillis() - startTime); if (time >= fatalValve) { log.fatal("Call " + methodInvocation.getMethod().getDeclaringClass() + "." + methodInvocation.getMethod().getName() + "() take " + time + " ms."); } else if (time >= errorValve) { log.error("Call " + methodInvocation.getMethod().getDeclaringClass() + "." + methodInvocation.getMethod().getName() + "() take " + time + " ms."); } else if (time >= warnValve) { log.warn("Call " + methodInvocation.getMethod().getDeclaringClass() + "." + methodInvocation.getMethod().getName() + "() take " + time + " ms."); } else if (time >= infoValve) { log.info("Call " + methodInvocation.getMethod().getDeclaringClass() + "." + methodInvocation.getMethod().getName() + "() take " + time + " ms."); } else { log.debug("Call " + methodInvocation.getMethod().getDeclaringClass() + "." + methodInvocation.getMethod().getName() + "() take " + time + " ms."); } } } }