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123 lines
4.3 KiB
Java
123 lines
4.3 KiB
Java
package cn.aofeng.demo.aspectj;
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import org.apache.commons.lang.ArrayUtils;
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import org.aspectj.lang.JoinPoint;
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import org.aspectj.lang.ProceedingJoinPoint;
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import org.aspectj.lang.annotation.After;
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import org.aspectj.lang.annotation.AfterReturning;
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import org.aspectj.lang.annotation.AfterThrowing;
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import org.aspectj.lang.annotation.Around;
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import org.aspectj.lang.annotation.Aspect;
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import org.aspectj.lang.annotation.Before;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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/**
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* 拦截器。
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*
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* @author <a href="mailto:aofengblog@163.com">聂勇</a>
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*/
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@Aspect
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public class BusinessServiceInterceptor {
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private static Logger _logger = LoggerFactory.getLogger(BusinessServiceInterceptor.class);
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private char _style = '-';
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/**
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* <pre>
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* Before通知不能修改方法传入的参数。
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* </pre>
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*/
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@Before("execution(public * cn.aofeng.demo.aspectj.BusinessService.add(..))")
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public void beforeAdd(JoinPoint joinPoint) {
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_logger.info( String.format("拦截到方法：%s, 传入参数：%s",
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joinPoint.getSignature().getName(),
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ArrayUtils.toString(joinPoint.getArgs()) ) );
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BusinessService.printLine(_style);
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}
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/**
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* <pre>
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* After通知不能修改方法的返回值。
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* 如果被拦截的方法抛出异常，拦截代码仍然正常执行。
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* </pre>
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*/
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@After("execution(public * cn.aofeng.demo.aspectj.BusinessService.join(..))")
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public void beforeAddSupportMultiArgs(JoinPoint joinPoint) {
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_logger.info("Signature.name："+joinPoint.getSignature().getName());
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_logger.info("Args：" + ArrayUtils.toString(joinPoint.getArgs()));
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_logger.info("Target：" + ArrayUtils.toString(joinPoint.getTarget()));
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_logger.info("This：" + ArrayUtils.toString(joinPoint.getThis()));
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_logger.info("Kind：" + ArrayUtils.toString(joinPoint.getKind()));
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_logger.info("SourceLocation：" + ArrayUtils.toString(joinPoint.getSourceLocation()));
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// 试图修改传入的参数
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joinPoint.getArgs()[0] = "100";
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BusinessService.printLine(_style);
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}
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/**
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* <pre>
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* AfterReturning通知不能修改方法的返回值。
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* 如果被拦截的方法抛出异常，拦截代码不再执行。
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* </pre>
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*/
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@AfterReturning(pointcut="execution(public * cn.aofeng.demo.aspectj.BusinessService.join(..))", returning="result")
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public void afterReturnAdd(JoinPoint joinPoint, Object result) {
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_logger.info( String.format("拦截到方法：%s, 传入参数：%s, 执行结果：%s",
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joinPoint.getSignature().getName(),
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ArrayUtils.toString(joinPoint.getArgs()),
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result) );
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// 试图修改返回值
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result = "hello, changed";
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BusinessService.printLine(_style);
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}
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/**
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* <pre>
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* 只在被拦截的方法抛出异常时才执行。
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* </pre>
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*/
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@AfterThrowing(pointcut="execution(public * cn.aofeng.demo.aspectj.BusinessService.join(..))", throwing="ex")
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public void afterThrowingAdd(JoinPoint joinPoint, Exception ex) {
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_logger.info( String.format("拦截到方法：%s, 传入参数：%s",
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joinPoint.getSignature().getName(),
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ArrayUtils.toString(joinPoint.getArgs()) ) );
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if (null != ex) {
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_logger.info("拦截到异常：", ex);
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}
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BusinessService.printLine(_style);
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}
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/**
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* <pre>
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* {@link ProceedingJoinPoint}只能在Around通知中使用。
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* Around通知可以修改被拦截方法的传入参数和返回值。
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* </pre>
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*/
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@Around("execution(public * cn.aofeng.demo.aspectj.BusinessService.addPrefix(..))")
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public Object afterAround(ProceedingJoinPoint joinPoint) throws Throwable {
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_logger.info( String.format("拦截到方法：%s, 传入参数：%s",
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joinPoint.getSignature().getName(),
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ArrayUtils.toString(joinPoint.getArgs()) ) );
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Object result = null;
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try {
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result = joinPoint.proceed();
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_logger.info("执行结果：" + result);
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} catch (Throwable e) {
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throw e;
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} finally {
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BusinessService.printLine(_style);
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}
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return result;
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}
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}
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