学习笔记---------------AOP

一.aop注解方式   spring2.5只支持方法的拦截

1.准备

 

 

 

 

 

2.beanx.xml    使用注解方式都需要交给spring管理

<?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:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd"> <aop:aspectj-autoproxy/> <bean id="myInterceptor" class="cn.itcast.service.MyInterceptor"/> <bean id="personService" class="cn.itcast.service.impl.PersonServiceBean"></bean> </beans>

 

 

3.切面

MyInterceptor.java

package cn.itcast.service; import org.aspectj.lang.ProceedingJoinPoint; import org.aspectj.lang.annotation.After; import org.aspectj.lang.annotation.AfterReturning; import org.aspectj.lang.annotation.AfterThrowing; import org.aspectj.lang.annotation.Around; import org.aspectj.lang.annotation.Aspect; import org.aspectj.lang.annotation.Before; import org.aspectj.lang.annotation.Pointcut; /** * 切面 * */ @Aspect public class MyInterceptor { @Pointcut("execution (* cn.itcast.service.impl.PersonServiceBean.*(..))")//类型 包名.类名.方法名（参数） 包名后..(代表所有子包，所有类) private void anyMethod() {}//声明一个切入点 @Before("anyMethod() && args(name)")//定义一个参数，表达式的参数被定死了。 public void doAccessCheck(String name) { System.out.println("前置通知:"+ name); } @AfterReturning(pointcut="anyMethod()",returning="result")//returning设置返回类型，表达式的类型被定死了。 public void doAfterReturning(String result) { System.out.println("后置通知:"+ result); } @After("anyMethod()") public void doAfter() { System.out.println("最终通知"); } @AfterThrowing(pointcut="anyMethod()",throwing="e") public void doAfterThrowing(Exception e) { System.out.println("例外通知:"+ e); } @Around("anyMethod()") public Object doBasicProfiling(ProceedingJoinPoint pjp) throws Throwable { //if(){//判断用户是否在权限 System.out.println("进入方法"); Object result = pjp.proceed(); System.out.println("退出方法"); //} return result; } }

 

 

 

4.PersonService.java接口

package cn.itcast.service; public interface PersonService { public void save(String name); public void update(String name, Integer id); public String getPersonName(Integer id); }

5.PersonServiceBean.java

package cn.itcast.service.impl; import cn.itcast.service.PersonService; public class PersonServiceBean implements PersonService { public String getPersonName(Integer id) { System.out.println("我是getPersonName()方法"); return "xxx"; } public void save(String name) { throw new RuntimeException("我爱例外"); //System.out.println("我是save()方法"); } public void update(String name, Integer id) { System.out.println("我是update()方法"); } }

6.junit测试

package junit.test; import org.junit.BeforeClass; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import cn.itcast.service.PersonService; public class SpringAOPTest { @BeforeClass public static void setUpBeforeClass() throws Exception { } @Test public void interceptorTest(){ ApplicationContext cxt = new ClassPathXmlApplicationContext("beans.xml"); PersonService personService = (PersonService)cxt.getBean("personService"); personService.save("xx"); } }

 

二.配置文件实现aop

1.beans.xml

<?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:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd"> <aop:aspectj-autoproxy/> <bean id="personService" class="cn.itcast.service.impl.PersonServiceBean"></bean> <bean id="aspetbean" class="cn.itcast.service.MyInterceptor"/> <aop:config> <aop:aspect id="asp" ref="aspetbean"> <aop:pointcut id="mycut" expression="execution(* cn.itcast.service..*.*(..))"/> <aop:before pointcut-ref="mycut" method="doAccessCheck"/> <aop:after-returning pointcut-ref="mycut" method="doAfterReturning"/> <aop:after-throwing pointcut-ref="mycut" method="doAfterThrowing"/> <aop:after pointcut-ref="mycut" method="doAfter"/> <aop:around pointcut-ref="mycut" method="doBasicProfiling"/> </aop:aspect> </aop:config> </beans>

 

2.原来的MyInterceptor.java就不需要注解了

package cn.itcast.service; import org.aspectj.lang.ProceedingJoinPoint; /** * 切面 * */ public class MyInterceptor { public void doAccessCheck() { System.out.println("前置通知"); } public void doAfterReturning() { System.out.println("后置通知"); } public void doAfter() { System.out.println("最终通知"); } public void doAfterThrowing() { System.out.println("例外通知"); } public Object doBasicProfiling(ProceedingJoinPoint pjp) throws Throwable { System.out.println("进入方法"); Object result = pjp.proceed(); System.out.println("退出方法"); return result; } }