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日志总数:1304
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建立时间:2006年5月29日 |
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 [Spring]spring aop编程(二)
软件技术
lhwork 发表于 2006/9/18 9:55:30 |
| 前面主要介绍了如何通过xml实现aop编程，下面主要介绍如何通过@AspectJ来实现。为了使@AspectJ 支持生效,需要做以下步骤：在xml中设置
<aop:aspectj-autoproxy/>
或者在xml中加入<bean class="org.springframework.aop.aspectj.annotation.AnnotationAwareAspectJAutoProxyCreator" />声明 aspect
<bean id="myAspect" class="org.xyz.NotVeryUsefulAspect">
<!-- configure properties of aspect here as normal -->
</bean>
package org.xyz;
import org.aspectj.lang.annotation.Aspect;
@Aspect
public class NotVeryUsefulAspect {
}
声明
pointcut
@Pointcut("execution(* transfer(..))")
public void transfer() {}
声明
advice
Before advice:
@Before("com.xyz.myapp.SystemArchitecture.dataAccessOperation()")
public void doAccessCheck() {
// ...
}
After returning advice:
@AfterReturning("com.xyz.myapp.SystemArchitecture.dataAccessOperation()")
public void doAccessCheck() {
// ...
}
或者
@AfterReturning(pointcut="com.xyz.myapp.SystemArchitecture.dataAccessOperation()",returning="retVal")
public void doAccessCheck(Object retVal) {
// ...
}
After throwing advice：
@AfterThrowing("SystemArchitecture.dataAccessOperation()")
public void doRecoveryActions() {
// ...
}
或者
@AfterThrowing(
pointcut=" SystemArchitecture.dataAccessOperation()",
throwing="ex")
public void doRecoveryActions(DataAccessException ex) {
// ...
}
After (finally) advice：
@After("com.xyz.myapp.SystemArchitecture.dataAccessOperation()")
public void doReleaseLock() {
// ...
}
Around advice：
@Around("com.xyz.myapp.SystemArchitecture.businessService()")
public Object doBasicProfiling(
ProceedingJoinPoint
pjp) throws Throwable {
// start stopwatch
Object retVal = pjp.proceed();
// stop stopwatch
return retVal;
}
Advice parameters：
@Before("com.xyz.myapp.SystemArchitecture.dataAccessOperation() &&" +
"args(account,..)"
)
public void validateAccount(Account account) {
// ...
}
声明参数名称：
@Before(
value="com.xyz.lib.Pointcuts.anyPublicMethod() && " +
"@annotation(auditable)",
argNames="auditable"
)
public void audit(Auditable auditable) {
AuditCode code = auditable.value();
// ...
}
Advice 排序：
一般以声明的方法次序为先后
不同的
Advice
，通过实现
Ordered
接口，来排序
Introductions
用于引入新的接口
@Aspect
public class UsageTracking {
@DeclareParents(value="com.xzy.myapp.service.*+",
defaultImpl=DefaultUsageTracked.class)
public static UsageTracked mixin;
@Before("com.xyz.myapp.SystemArchitecture.businessService() &&" +
"this(usageTracked)")
public void recordUsage(UsageTracked usageTracked) {
usageTracked.incrementUseCount();
}
} |
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