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代码地址#xff1a;
orbit-hub/spring-boot-samples at master (github.com)https://github.com/orbit-hub/spring-boot-samples/tree/master
切面执行顺序
Spring5以后顺序就一切正常 正常#xff1a;前置通知目标方法返回通知后置通知 异常: 前置通知目标方…切面编程
代码地址
orbit-hub/spring-boot-samples at master (github.com)https://github.com/orbit-hub/spring-boot-samples/tree/master
切面执行顺序
Spring5以后顺序就一切正常 正常前置通知目标方法返回通知后置通知 异常: 前置通知目标方法异常通知后置通知 try{ 前置通知 目标方法的执行 返回通知 }catch(){ 异常通知 }finally{ 后置通知 }
1、使用注解形式 定义注解
Target({ ElementType.PARAMETER, ElementType.METHOD })
Retention(RetentionPolicy.RUNTIME)
Documented
public interface Log {public String title() default 11;}定义切面
Aspect
Component
public class LogAspect2 {/*** 处理请求前执行*/Before(value annotation(controllerLog))public void boBefore(JoinPoint joinPoint, Log controllerLog) {System.out.println(controllerLog.title());String name joinPoint.getSignature().getName();System.out.println(前置logStart()name....【args: Arrays.asList(joinPoint.getArgs()) 】);}/*** 处理完请求后执行** param joinPoint 切点*/AfterReturning(pointcut annotation(controllerLog), returning jsonResult)public void doAfterReturning(JoinPoint joinPoint, Log controllerLog, Object jsonResult) {System.out.println(controllerLog.title());String name joinPoint.getSignature().getName();System.out.println(返回logReturn()name....【args: Arrays.asList(joinPoint.getArgs()) 】【result: jsonResult】);}//后置通知After(value annotation(controllerLog))public void logEnd(JoinPoint joinPoint, Log controllerLog){System.out.println(controllerLog.title());String name joinPoint.getSignature().getName();System.out.println(后置logEnd()name....【args: Arrays.asList(joinPoint.getArgs()) 】);}/*** 拦截异常操作** param joinPoint 切点* param e 异常*/AfterThrowing(value annotation(controllerLog), throwing e)public void doAfterThrowing(JoinPoint joinPoint, Log controllerLog, Exception e) {System.out.println(controllerLog.title());String name joinPoint.getSignature().getName();System.out.println(异常logError()name....【args: Arrays.asList(joinPoint.getArgs()) 】【exception: e】);}} 定义目标 Component
public class HelloService {Logpublic String sayHello(String name){String result 你好name;System.out.println(result);int length name.length();return result --- length;}
} 配置类 Configuration
EnableAspectJAutoProxy
ComponentScan(com.orbit.aop)
public class MainConfig {} 测试类 public class AnnotationMainTest {public static void main(String[] args) {ApplicationContext applicationContext new AnnotationConfigApplicationContext(MainConfig.class);HelloService helloService applicationContext.getBean(HelloService.class);helloService.sayHello(zhangsan);}} 没有异常 11
前置logStart()sayHello....【args: [zhangsan]】
你好zhangsan
11
返回logReturn()sayHello....【args: [zhangsan]】【result: 你好zhangsan---8】
11
后置logEnd()sayHello....【args: [zhangsan]】 有异常
11
前置logStart()sayHello....【args: [zhangsan]】
你好zhangsan
11
异常logError()sayHello....【args: [zhangsan]】【exception: java.lang.ArithmeticException: / by zero】
11
后置logEnd()sayHello....【args: [zhangsan]】
Exception in thread main java.lang.ArithmeticException: / by zero
2、使用切入点表达式
切入点表达式语法 语法结构 execution([ 权限修饰符 ] [ 返回类型 ] [ 类全路径 ] [ 方法名称 ]([ 参数列表 ]) ) 举例 对 com.orbit.aop.service.HelloService类里面的 sayHello进行增强 execution(* com.orbit.aop.service.HelloService.sayHello(..)) 定义切面
Aspect //说明这是切面
Component //切面也是容器中的组件
public class LogAspect {//前置通知 增强方法/增强器Before(execution(* com.orbit.aop.service.HelloService.sayHello(..)))public void logStart(JoinPoint joinPoint){String name joinPoint.getSignature().getName();System.out.println(前置logStart()name....【args: Arrays.asList(joinPoint.getArgs()) 】);}//返回通知AfterReturning(value execution(* com.orbit.aop.service.HelloService.sayHello(..)),returning result)public void logReturn(JoinPoint joinPoint,Object result){String name joinPoint.getSignature().getName();System.out.println(返回logReturn()name....【args: Arrays.asList(joinPoint.getArgs()) 】【result: result】);}//后置通知After(execution(* com.orbit.aop.service.HelloService.sayHello(..)))public void logEnd(JoinPoint joinPoint){String name joinPoint.getSignature().getName();System.out.println(后置logEnd()name....【args: Arrays.asList(joinPoint.getArgs()) 】);}//异常AfterThrowing(value execution(* com.orbit.aop.service.HelloService.sayHello(..)),throwing e)public void logError(JoinPoint joinPoint,Exception e){String name joinPoint.getSignature().getName();System.out.println(异常logError()name....【args: Arrays.asList(joinPoint.getArgs()) 】【exception: e】);}
}
没有异常 前置logStart()sayHello....【args: [zhangsan]】
你好zhangsan
返回logReturn()sayHello....【args: [zhangsan]】【result: 你好zhangsan---8】
后置logEnd()sayHello....【args: [zhangsan]】 有异常 前置logStart()sayHello....【args: [zhangsan]】
你好zhangsan
异常logError()sayHello....【args: [zhangsan]】【exception: java.lang.ArithmeticException: / by zero】
后置logEnd()sayHello....【args: [zhangsan]】
