Spring入门篇 学习笔记
Spring 所有的切面和通知器都必须放在一个 aop:config 内(可以配置包含多个 aop:config 元素)，每一个 aop:config 可以包含 pointcut, advisor 和 aspect 元素(它们必须按照这个顺序进行声明)
aop:config 风格的配置大量使用了 Spring 的自动代理机制
配置 Aspect
新建切面类：
public class MoocAspect {
}
添加配置：
<?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"
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-4.0.xsd">
<bean id="moocAspect" class="com.karonda.aop.schema.advice.MoocAspect"></bean>
<aop:config>
<aop:aspect id="moocAspectAOP" ref="moocAspect">
</aop:aspect>
</aop:config>
</beans>
配置 Pointcut
pointcut 类型说明详见：pointcut expressions
新建类：
public class AspectBiz {
}
修改配置文件：
<?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"
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-4.0.xsd">
<bean id="moocAspect" class="com.karonda.aop.schema.advice.MoocAspect"></bean>
<bean id="aspectBiz" class="com.karonda.aop.schema.advice.biz.AspectBiz"></bean>
<aop:config>
<aop:aspect id="moocAspectAOP" ref="moocAspect">
<aop:pointcut id="moocPointcut" expression="execution(* com.karonda.aop.schema.advice.biz.*Biz.*(..))"/>
</aop:aspect>
</aop:config>
</beans>
Advice
添加依赖包 aspectjweaver：
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.8.13</version>
</dependency>
修改 MoocAspect：
public class MoocAspect {
public void before(){
System.out.println("MoocAspect before.");
}
public void afterReturning(){
System.out.println("MoocAspect afterReturning.");
}
public void afterThrowing(){
System.out.println("MoocAspect afterThrowing.");
}
public void after(){
System.out.println("MoocAspect after.");
}
// 环绕通知方法的第一个参数必须是 ProceedingJoinPoint 类型
public Object around(ProceedingJoinPoint pjp){
Object obj = null;
try{
System.out.println("MoocAspect around 1.");
obj = pjp.proceed();
System.out.println("MoocAspect around 2.");
}catch (Throwable e){
e.printStackTrace();
}
return obj;
}
public Object aroundInit(ProceedingJoinPoint pjp, String bizName, int times){
System.out.println(bizName + " " + times);
Object obj = null;
try{
System.out.println("MoocAspect aroundInit 1.");
obj = pjp.proceed();
System.out.println("MoocAspect aroundInit 2.");
}catch (Throwable e){
e.printStackTrace();
}
return obj;
}
}
修改 AspectBiz：
public class AspectBiz {
public void biz() {
System.out.println("AspectBiz biz.");
// throw new RuntimeException();
}
public void init(String bizName, int times){
System.out.println("AspectBiz init: " + bizName + " " + times);
}
}
修改配置：
<?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"
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-4.0.xsd">
<bean id="moocAspect" class="com.karonda.aop.schema.advice.MoocAspect"></bean>
<bean id="aspectBiz" class="com.karonda.aop.schema.advice.biz.AspectBiz"></bean>
<aop:config>
<aop:aspect id="moocAspectAOP" ref="moocAspect">
<aop:pointcut expression="execution(* com.karonda.aop.schema.advice.biz.*Biz.*(..))" id="moocPiontcut"/>
<!--前置通知-->
<aop:before method="before" pointcut-ref="moocPiontcut"/>
<!--返回后通知-->
<aop:after-returning method="afterReturning" pointcut-ref="moocPiontcut"/>
<!--抛出异常通知-->
<aop:after-throwing method="afterThrowing" pointcut-ref="moocPiontcut" />
<!--后通知-->
<aop:after method="after" pointcut-ref="moocPiontcut"/>
<!--环绕通知-->
<aop:around method="around" pointcut-ref="moocPiontcut"/>
<!--带参数-->
<aop:around method="aroundInit" pointcut="execution(* com.karonda.aop.schema.advice.biz.AspectBiz.init(String, int))
and args(bizName, times)"/>
</aop:aspect>
</aop:config>
</beans>
添加测试类：
@RunWith(BlockJUnit4ClassRunner.class)
public class TestAOPSchemaAdvice extends UnitTestBase {
public TestAOPSchemaAdvice(){
super("classpath:spring-aop-schema-advice.xml");
}
@Test
public void testBiz(){
AspectBiz biz = super.getBean("aspectBiz");
biz.biz();
}
@Test
public void testInit(){
AspectBiz biz = super.getBean("aspectBiz");
biz.init("moocService", 3);
}
}