Facets of Springboot AOP

Springboot provides powerful AOP support, and we've explained AOP-oriented facets, so here's how the specific AOP principle complements the specific description;

AOP aspect is mainly cut method, we usually engage in some log analysis and transaction operations, to use the plane, similar to interceptors;

@Aspect annotations are facet annotation classes

@Pointcut tangency Definition

@Before is called before the method executes

@After is called after the method executes

Call @AfterReturning method Execution return value

The service layer itself can be cut into transactions, so we have a common method of cutting controller layer

Each method that executes the controller layer records the request URL, the visitor IP executes the class method parameter and other information;

Define a slice class: Requestaspect

importjavax.servlet.http.HttpServletRequest;

import org.apache.log4j.Logger; import org.aspectj.lang.JoinPoint; import org.aspectj.lang.annotation.After; import org.aspectj.lang.annotation.AfterReturning; import org.aspectj.lang.annotation.Aspect; import org.aspectj.lang.annotation.Before; import org.aspectj.lang.annotation.Pointcut; import org.springframework.stereotype.Component; import org.springframework.web.context.request.RequestContextHolder; import org.springframework.web.context.request.ServletRequestAttributes; @Aspect @Component public class RequestAspect {        private Logger logger=Logger.getLogger(RequestAspect. class );           @Pointcut ( "execution(public * com.java1234.controller.*.*(..))" )      public void log(){      }           @Before ( "log()" )      public void deoBefore(JoinPoint joinPoint){          logger.info( "方法执行前..." );          ServletRequestAttributes sra=(ServletRequestAttributes) RequestContextHolder.getRequestAttributes();          HttpServletRequest request=sra.getRequest();          logger.info( "url:" +request.getRequestURI());          logger.info( "ip:" +request.getRemoteHost());          logger.info( "method:" +request.getMethod());          logger.info( "class_method:" +joinPoint.getSignature().getDeclaringTypeName()+ "." +joinPoint.getSignature().getName());          logger.info( "args:" +joinPoint.getArgs());      }           @After ( "log()" )      public void doAfter(JoinPoint joinPoint){          logger.info( "方法执行后..." );      }           @AfterReturning (returning= "result" ,pointcut= "log()" )      public void doAfterReturning(Object result){          logger.info( "执行返回值：" +result);      } }

Execution (Public * com.java1234.controller.*.* (..)) This definition means to cut into any class, arbitrary method, arbitrary parameter, or any method of return value under the Com.java1234.controller package.

We test Studentcontroller.

Request: Http://localhost:8888/studentAdd.html

Click "Submit",

Console display:

2017-08-11 11:22:46.357 INFO 9896---[nio-8888-exec-9] com.java1234.aspect.RequestAspect: Before method execution ...

2017-08-11 11:22:46.358 INFO 9896---[nio-8888-exec-9] com.java1234.aspect.requestaspect:url:/student/add

2017-08-11 11:22:46.358 INFO 9896---[nio-8888-exec-9] com.java1234.aspect.requestaspect:ip:0:0:0:0:0:0:0:1

2017-08-11 11:22:46.358 INFO 9896---[nio-8888-exec-9] Com.java1234.aspect.RequestAspect:method:POST

2017-08-11 11:22:46.358 INFO 9896---[nio-8888-exec-9] com.java1234.aspect.RequestAspect:class_method:com.java1 234.controller. Studentcontroller.add

2017-08-11 11:22:46.358 INFO 9896---[nio-8888-exec-9] com.java1234.aspect.requestaspect:args:[ljava.lang.objec t; @fd1ee9

Hibernate:insert to T_student (age, name) values (?,?)

2017-08-11 11:22:46.372 INFO 9896---[nio-8888-exec-9] com.java1234.aspect.RequestAspect: After method execution ...

2017-08-11 11:22:46.373 INFO 9896---[nio-8888-exec-9] com.java1234.aspect.RequestAspect: Execution return value: Add success!

Here we get the information we need;

Of course, the use of the log springboot recommended Logback log4j Upgrade version of the use of almost the same;

Facets of Springboot AOP