------------吾亦无他,唯手熟尔，谦卑若愚，好学若饥-------------
aspectJ的xml版是开发中最常用的：
下面直接已案例入手，毕竟繁琐的日子不多了
案例：两个接口，俩个实现类，一个实现增强的普通类
ISomeService接口：
package cn.dawn.day20aspectjxml; /** * Created by Dawn on 2018/3/8. */ public interface ISomeService { public void insert(); public void delete(); public void select(); public void update(); }
SomeServiceImpl类，上方类的实现类：
package cn.dawn.day20aspectjxml; /** * Created by Dawn on 2018/3/8. */ public class SomeServiceImpl implements ISomeService { public void insert() { System.out.println("insert ok"); } public void delete() { System.out.println("delete ok"); } public void select() { System.out.println("select ok"); } public void update() { System.out.println("update ok"); } }
IBookService接口
package cn.dawn.day20aspectjxml; /** * Created by Dawn on 2018/3/12. */ public interface IBookService { public void selectAllBooks(); }
BookServiceImpl类，上面那个接口的实现类
package cn.dawn.day20aspectjxml; /** * Created by Dawn on 2018/3/12. */ public class BookServiceImpl implements IBookService { public void selectAllBooks() { System.out.println("selectbooks ok"); int a=5/0; System.out.println(a); } }
实现增强的普通类：
package cn.dawn.day20aspectjxml; import org.aspectj.lang.JoinPoint; import org.aspectj.lang.ProceedingJoinPoint; /** * Created by Dawn on 2018/3/12. */ public class MyAspectJ { /*最后增强，无论是否出现异常都会执行*/ public void myAfter(){ System.out.println("最终增强"); } /*后置增强*/ public void myAfterReturning(){ System.out.println("后置增强"); } /*前置增强*/ public void myBefore(){ System.out.println("前置增强"); } /*前置增强，这种写法可以一会调用出切点表达式，在console打印出来：当然xml文件中另外需要配置一道*/ public void myBefore1(JoinPoint jp){ System.out.println("前置通知方法jp = " + jp); } /*异常增强*/ public void myAfterThrowing(){ System.out.println("异常增强"); } /*环绕增强*/ public void myAround(ProceedingJoinPoint pjp) throws Throwable { System.out.println("环绕增强前"); pjp.proceed(); System.out.println("环绕增强后"); } }
xml中：
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <!--要增强的对象--> <bean id="service" class="cn.dawn.day20aspectjxml.SomeServiceImpl"></bean> <bean id="bookservice" class="cn.dawn.day20aspectjxml.BookServiceImpl"></bean> <!--增强的内容--> <bean id="MyAspectJ" class="cn.dawn.day20aspectjxml.MyAspectJ"></bean> <!--aspectjxml的自动代理--> <aop:config> <aop:pointcut id="mypointcut1" expression="execution(* *..day20aspectjxml.*.select(..))"></aop:pointcut> <aop:pointcut id="mypointcut2" expression="execution(* *..day20aspectjxml.*.update(..))"></aop:pointcut> <aop:pointcut id="mypointcut3" expression="execution(* *..day20aspectjxml.*.select*(..))"></aop:pointcut> <aop:pointcut id="mypointcut4" expression="execution(* *..day20aspectjxml.*.delete(..))"></aop:pointcut> <aop:aspect ref="MyAspectJ"> <aop:before method="myBefore" pointcut-ref="mypointcut2"></aop:before> <aop:before method="myBefore1(org.aspectj.lang.JoinPoint)" pointcut-ref="mypointcut2"></aop:before> <aop:after method="myAfter" pointcut-ref="mypointcut1"></aop:after> <aop:around method="myAround(org.aspectj.lang.ProceedingJoinPoint)" pointcut-ref="mypointcut4"></aop:around> <aop:after-throwing method="myAfterThrowing" pointcut-ref="mypointcut3"></aop:after-throwing> <aop:after-returning method="myAfterReturning" pointcut-ref="mypointcut1"></aop:after-returning> </aop:aspect> </aop:config> </beans>
这儿的method方法中加了(参数)会报红，不需理会，一会执行没有错误就行
写法的格式就是这样
单测：
package cn.dawn.day20aspectjxml; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; /** * Created by Dawn on 2018/3/3. */ public class test20180312 { @Test /*aop代理工厂bean异常增强*/ public void t01(){ ApplicationContext context=new ClassPathXmlApplicationContext("ApplicationContext-day20aspectjxml.xml"); ISomeService service = (ISomeService) context.getBean("service"); IBookService bookservice = (IBookService) context.getBean("bookservice"); try { bookservice.selectAllBooks(); }catch(Exception e){ e.printStackTrace(); } System.out.println("================观察=================="); service.update(); System.out.println("================观察=================="); service.delete(); System.out.println("================观察=================="); service.select(); System.out.println("================观察=================="); } }
繁琐的东西结束了
我记得我的老师说过一句话，java核心，java能不死，能辉煌这么多年的原因就是Spring,学会Spring可以赚3000，如果你搞java不会Spring，你连3000都赚不到
其中IOC（控制反转）值1000，AOP（面向切面编程）值2000，至此，3000块的东西讲的差不多了，aop也结束了，
下面我还会继续更新博客，Spring的事物，JDBCTemplate,以及整合MyBatis,然后此Spring部分也就差不多完结了，以后有时间再补充更多关于Spring的知识点
