spring 基于Aspect和注解的切面编程(aop)

spring bean配置中

<bean id="toggleDataSourceAdvice" class="com.gsww.jzfp.core.dataresource.aop.ToggleDataSourceAdvice"></bean>    <aop:aspectj-autoproxy/>

注解代码如下：

/** * 用于注解数据切换 * @author wyy *@version 2015-12-02 */@Retention(RetentionPolicy.RUNTIME)@Target(ElementType.METHOD)public @interface ToggleDataSource {/** * 数据源名称 * @return */String name() default DataSourceContextHolder.BASE;}

切面通知基类

/** * 切面通知抽象基类 * @author wyy *@version 2015-12-02 * @param <T> */public abstract class AbstractAdvice<T extends Annotation> {protected final Class<T> annotationClass;protected AbstractAdvice(final Class<T> annotationClass) {this.annotationClass = annotationClass;}protected abstract Logger getLogger();protected void warn(final Exception e, final String format, final Object... args) {        if (getLogger().isWarnEnabled()) {            getLogger().warn(String.format(format, args), e);        }    }protected Method getMethod(final JoinPoint jp)throws NoSuchMethodException {final Signature sig = jp.getSignature();if (!(sig instanceof MethodSignature)) {throw new InvalidAnnotationException("This annotation is only valid on a method.");}final MethodSignature msig = (MethodSignature) sig;final Object target = jp.getTarget();// cannot use msig.getMethod() because it can return the method where// annotation was declared i.e. method in// interfaceString name = msig.getName();Class<?>[] parameters = msig.getParameterTypes();Method method = findMethodFromTargetGivenNameAndParams(target, name,parameters);return method;}protected Method findMethodFromTargetGivenNameAndParams(final Object target, final String name, final Class<?>[] parameters)throws NoSuchMethodException {Method method = target.getClass().getMethod(name, parameters);getLogger().debug("Method to cache: {}", method);return method;}protected void verifyReturnTypeIsList(final Method method, final Class<?> annotationClass) {        if (!verifyTypeIsList(method.getReturnType())) {            throw new InvalidAnnotationException(                    String.format("The annotation [%s] is only valid on a method that returns a [%s] or its subclass. "                            + "[%s] does not fulfill this requirement.", annotationClass.getName(), List.class.getName(), method.toString()));        }    }protected boolean verifyTypeIsList(final Class<?> clazz) {        return List.class.isAssignableFrom(clazz);    }    protected void verifyReturnTypeIsNoVoid(final Method method, final Class<?> annotationClass) {        if (method.getReturnType().equals(void.class)) {            throw new InvalidParameterException(String.format("Annotation [%s] is defined on void method  [%s]", annotationClass,                    method.getName()));        }    }}

切面处理类

/** *  * <bean id="toggleDataSourceAdvice" class="com.gsww.jzfp.core.dataresource.aop.ToggleDataSourceAdvice"></bean> *  <aop:aspectj-autoproxy/>  *  *//** *  * @author QQ:16349023 * */@Aspectpublic class ToggleDataSourceAdvice extends AbstractAdvice<ToggleDataSource> {private static final Logger LOG = LoggerFactory.getLogger(ToggleDataSourceAdvice.class);public ToggleDataSourceAdvice(){super(ToggleDataSource.class);}@Pointcut("@annotation(com.gsww.jzfp.core.dataresource.aop.ToggleDataSource)")    public void getTargetMethod() {        /* pointcut definition */    }    @Around("getTargetMethod()")    public Object around(final ProceedingJoinPoint pjp) throws Throwable {        //return cache(pjp);    //System.out.println("Around1***********************");        final ToggleDataSource annotation;    Object result;    try {            final Method method = getMethod(pjp);            System.out.println("method:"+method.toString());                        annotation = method.getAnnotation(ToggleDataSource.class);            //根据注解在方法执行前进行处理 to do            System.out.println("annotation:"+annotation.toString());            result = pjp.proceed();        } catch (Exception ex) {            warn(ex, "Caching on method %s and key [%s] aborted due to an error.", pjp.toShortString());            result = pjp.proceed();        }    //final Object result = pjp.proceed();    //System.out.println("Around2***********************");        return result;    }        @Before("getTargetMethod()")    public void before() throws Throwable{        System.out.println("before***********************");    }        @After("getTargetMethod()")    public void after() throws Throwable{    System.out.println("after**************************");    }        @Overrideprotected Logger getLogger() {        return LOG;    }}