@ Aspect@Order what is the order in which notifications are executed

I would like to share with you the order in which @ Aspect@Order notices are executed. I believe most people don't know much about it, so share this article for your reference. I hope you will learn a lot after reading this article. Let's learn about it.

@ Aspect@Order the execution order of each notification

Two aspect classes: [log] and [judgment parameters], corresponding to the order @ Order (0) and @ Order (1), respectively.

This article will only focus on the order of execution.

Code

[business category]

/ * login controller * / @ Controllerpublic class LoginController {/ / throws an exception public void loginWithThrow (String username, String password) throws Exception {if (username = = null | | password = = null) {throw new Exception ("login information cannot be empty");} System.out.println ("LoginController#login...") } / / public void loginWithTryCatch (String username, String password) {try {if (username = = null | | password = = null) {throw new Exception ("login information cannot be empty");} System.out.println ("LoginController#login...");} catch (Exception e) {e.printStackTrace () }}}

[section class]

/ * * output log annotations * / @ Order (0) @ Aspect@Componentpublic class LogAspect {/ / extract the methods of all classes under the common execution / / com.yuki.demo.aop.aspect package or subpackage @ Pointcut ("execution (* com.yuki.demo.aop.aspect..*.* (..)") Public void pointcut () {} / / pre-notice / / @ Before ("execution (public void com.yuki.demo.aop.aspect.LoginController.* (String,String))") @ Before ("pointcut ()") public void before () {System.out.println ("LogAspect#before...") } / / ProceedingJoinPoint only has @ Around ("execution (public void com.yuki.demo.aop.aspect.LoginController.* (String,String))") public void around (ProceedingJoinPoint joinPoint) throws Throwable {System.out.println ("LogAspectA#around start...") / / the execution of the proxy method. If there is no joinPoint.proceed (), the pre-notification @ Before will not be executed, and the other notifications will be normal joinPoint.proceed (). / / after executing the method, if joinPoint.proceed () throws an exception, the sentence will not be executed. After throwing an exception, the aroud method will jump out of System.out.println ("LogAspectA#around ends..."). } / / Post notification (as long as the join point is executed, regardless of whether an exception is thrown) @ After ("execution (public void com.yuki.demo.aop.aspect.LoginController.* (String,String)") public void after () {System.out.println ("LogAspect#after...") } / / exception notification (this notification is executed only if an exception is thrown outside the execution of the joinPoint.proceed () method) @ AfterThrowing ("execution (public void com.yuki.demo.aop.aspect.LoginController.* (String,String))") public void afterThrowing () {System.out.println ("LogAspect#afterThrowing...") } / / normal return notification notification (the notification will not be executed until it ends normally) @ AfterReturning ("execution (public void com.yuki.demo.aop.aspect.LoginController.* (String,String))") public void afterReturning () {System.out.println ("LogAspect#afterReturning...");}}

[section class]

/ * * facet class to determine whether the sign of the request parameter is correct * / @ Order (1) @ Aspect@Componentpublic class SignAspect {@ Around ("execution (public void com.yuki.demo.aop.aspect.LoginController.* (String,String))") public void around (ProceedingJoinPoint joinPoint) throws Throwable {System.out.println ("SignAspect#around start..."); joinPoint.proceed () System.out.println ("SignAspect#around ends...");}}

[startup configuration]

Omit... Non-key point

[test class]

@ SpringBootTestclass AopApplicationTests {@ Autowired private LoginController loginController; @ Test void contextLoads () {loginController.loginWithTryCatch ("yuki", "1234");}}

[console output]

LogAspectA#around, start.

LogAspect#before...

SignAspect#around, start.

LoginController#login...

The end of SignAspect#around...

The end of LogAspectA#around...

LogAspect#after...

LogAspect#afterReturning...

Summary

Spring AspectJ order (sequence) @ Aspect@Order (2) public class HelloWorldAspectAnnotation {/ * JoinPoint interface * @ param joinPoint * / / * public interface JoinPoint {String toString (); / / related information about the location of the connection point String toShortString (); / / short related information about the location of the connection point String toLongString () / / all relevant information about the location of the connection point Object getThis (); / / return the AOP proxy object Object getTarget (); / / return the target object Object [] getArgs (); / / return the notified method parameter list Signature getSignature (); / / return the current connection point signature SourceLocation getSourceLocation () / / returns the location of the connection point method in the class file String getKind (); / / connection point type StaticPart getStaticPart () / / return the static part of the connection point} * / define the pre-notification. Note here is sayHello2 / / use @ Before to declare the pre-notification. Where value is used to define a pointcut expression or to reference a named pointcut @ Before (value= "execution (* com.boventech..*.sayHello2 (..)) & & args (param)", argNames= "param") public void beforeAdvice (JoinPoint joinPoint,String param) {System.out.println (1) System.out.println ("= ="); System.out.println ("= param:" + param); System.out.println ("= ="); System.out.println (joinPoint.getArgs () .length); System.out.println ("= ="); System.out.println (joinPoint.toString ()) System.out.println ("= ="); System.out.println (joinPoint.getTarget ()); System.out.println ("= ="); System.out.println (joinPoint.getThis ()); System.out.println ("= ="); System.out.println ("= before advice") } / * value: specify a pointcut expression or name a pointcut Pointcut: also specifies a pointcut expression or named pointcut, and if specified will override the value attribute specified, pointcut has a high priority * / @ AfterReturning (value= "execution (* com.boventech..*.sayHello2 (..)) & & args (param)", argNames= "param", pointcut= "execution (* com.boventech..*.sayHello2 (..) & & args (param)") public void afterFinallyAdvice (JoinPoint joinPoint,String param) {System.out.println ("param:" + param); System.out.println ("=") System.out.println ("= after finally advice");} @ Aspect@Order (1) public class HelloWorldAspectAnnotation2 {/ * JoinPoint interface * @ param joinPoint * / / * public interface JoinPoint {String toString (); / / information about the location of the connection point String toShortString () / / brief related information about the location of the connection point String toLongString (); / / all relevant information about the location of the connection point Object getThis (); / / return AOP proxy object Object getTarget (); / / return target object Object [] getArgs () / / returns the list of notified method parameters Signature getSignature (); / / returns the current connection point signature SourceLocation getSourceLocation (); / / returns the location String getKind () in the class file where the connection point method resides; / / connection point type StaticPart getStaticPart () / / return the static part of the connection point} * / define the pre-notification. Note here is sayHello2 / / use @ Before to declare the pre-notification. Where value is used to define pointcut expressions or to reference named pointcuts @ Before (value= "execution (* com.boventech..*.sayHello2 (..)) & & args (param)", argNames= "param") public void beforeAdvice (JoinPoint joinPoint,String param) {System.out.println (2) System.out.println ("= =");} / * value: specify a pointcut expression or name a pointcut Pointcut: also specifies a pointcut expression or named pointcut, and if specified will override the value attribute specified, pointcut has a high priority * / @ AfterReturning (value= "execution (* com.boventech..*.sayHello2 (..)) & & args (param)", argNames= "param", pointcut= "execution (* com.boventech..*.sayHello2 (..) & & args (param)") public void afterFinallyAdvice (JoinPoint joinPoint,String param) {System.out.println ("order:" + 2) }} public class AopAnnotationTest {@ Test public void testHelloworld () {ApplicationContext ctx = new ClassPathXmlApplicationContext ("/ helloWorld2.xml"); IHelloWorld2Service helloworldService = ctx.getBean ("helloWorld2Service", IHelloWorld2Service.class); String param = "12"; helloworldService.sayHello2 (param) }} above is all the content of the article "what is the order of execution of @ Aspect@Order notifications". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!