SpringBoot提供了强大AOP支持,我们前面讲解过AOP面向切面,所以这里具体AOP原理就补具体介绍;
AOP切面主要是切方法,我们一般搞一些日志分析和事务操作,要用到切面,类似拦截器;
@Aspect注解是切面注解类
@Pointcut切点定义
@Before是方法执行前调用
@After是方法执行后调用
@AfterReturning方法执行返回值调用
Service层本身就可以切入事务,所以我们这类搞个常用的 切controller层方法
每个执行controller层的方法 都记录下请求Url,访问者IP 执行类方法参数等信息;
定义一个切面类:RequestAspect
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package com.java1234.aspect; import javax.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.*.*(..)) 这个定义 意思是 对 com.java1234.controller包下的任意类,任意方法,任意参数,任意返回值的方法都进行切入
我们测试 StudentController
请求:http://localhost:8888/studentAdd.html
点击“提交”,
控制台显示:
2017-08-11 11:22:46.357 INFO 9896 --- [nio-8888-exec-9] com.java1234.aspect.RequestAspect : 方法执行前...
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.java1234.controller.StudentController.add
2017-08-11 11:22:46.358 INFO 9896 --- [nio-8888-exec-9] com.java1234.aspect.RequestAspect : args:[Ljava.lang.Object;@fd1ee9
Hibernate: insert into t_student (age, name) values (?, ?)
2017-08-11 11:22:46.372 INFO 9896 --- [nio-8888-exec-9] com.java1234.aspect.RequestAspect : 方法执行后...
2017-08-11 11:22:46.373 INFO 9896 --- [nio-8888-exec-9] com.java1234.aspect.RequestAspect : 执行返回值:添加成功!
这里得到了我们需要的信息;
当然这里用到了日志 springboot推荐logback log4j的升级版 用法基本差不多;