SpingSping四种增强和顾问
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前置增强 后置增强 环绕增强 异常增强
先编写接口和实体类 ISomeService和SomeServiceImpl
package demo10;
/**
* Created by mycom on 2018/3/8.
*/
public interface ISomeService {
public void doSome();
}
package demo10;
/**
* Created by mycom on 2018/3/8.
*/
public class SomeServiceImpl implements ISomeService {
public void doSome() {
System.out.println("=================");
}
}
先来说第一个前置增强，直接用例子来说明
package demo10;
import org.springframework.aop.MethodBeforeAdvice;
import java.lang.reflect.Method;
/**
* Created by mycom on 2018/3/8.
*/
public class BeforeAdvice implements MethodBeforeAdvice {
public void before(Method method, Object[] objects, Object o) throws Throwable {
System.out.println("=========before");
}
}
在配置文件中
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<bean id="service" class="demo10.SomeServiceImpl"></bean>
<bean id="beforeAdvice" class="demo10.BeforeAdvice"></bean>
<bean id="proxyService" class="org.springframework.aop.framework.ProxyFactoryBean">
<property name="target" ref="service"></property>
<property name="interceptorNames" value="beforeAdvice"></property>
</bean>
</beans>
@Test
public void t1(){
ApplicationContext context=new ClassPathXmlApplicationContext("applicationContextBefore.xml");
ISomeService proxyService =(ISomeService) context.getBean("proxyService");
proxyService.doSome();
}
运行的结果是
2.后置增强和前置增强一样，只是改一改配置文件里的名称就可以
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<bean id="service" class="demo11.SomeServiceImpl"></bean>
<bean id="afterAdvice" class="demo11.AfterAdvice"></bean>
<bean id="proxyService" class="org.springframework.aop.framework.ProxyFactoryBean">
<property name="target" ref="service"></property>
<property name="interceptorNames" value="afterAdvice"></property>
</bean>
</beans>
3.环绕增强
直接饮用上面的接口和实现类了
在创建另一个类 MethodAdvice
package demo12;
import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
/**
* Created by mycom on 2018/3/8.
*/
public class MethodAdvice implements MethodInterceptor {
public Object invoke(MethodInvocation methodInvocation) throws Throwable {
System.out.println("前置增强");
Object result = methodInvocation.proceed();
System.out.println("后置增强");
return result;
}
}
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<bean id="service" class="demo12.SomeServiceImpl"></bean>
<bean id="methodAdvice" class="demo12.MethodAdvice"></bean>
<bean id="proxyService" class="org.springframework.aop.framework.ProxyFactoryBean">
<property name="target" ref="service"></property>
<property name="interceptorNames" value="methodAdvice"></property>
</bean>
</beans>
4.异常增强
package demo13;
import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
import org.springframework.aop.ThrowsAdvice;
/**
* Created by mycom on 2018/3/8.
*/
public class MyThroesAdvice implements ThrowsAdvice {
public void afterThrowing(Exception ex){
System.out.println("网络出现错误");
}
}
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<bean id="service" class="demo13.SomeServiceImpl"></bean>
<bean id="throwsAdvice" class="demo13.MyThroesAdvice"></bean>
<bean id="proxyService" class="org.springframework.aop.framework.ProxyFactoryBean">
<property name="target" ref="service"></property>
<property name="interceptorNames" value="throwsAdvice"></property>
</bean>
</beans>
@Test
public void t2(){
ApplicationContext context=new ClassPathXmlApplicationContext("applicationContextThrows.xml");
ISomeService proxyService =(ISomeService) context.getBean("proxyService");
try{
proxyService.doSome();
}catch (Exception ex){
ex.printStackTrace();
}
5.advisor 是顾问的意思 正对某一个方法增强
还有一个词是通知 advice 我自己的理解是 通知视同只所有人，顾问是针对某个人顾问，这样方便记忆
现在在ISomeService接口中在添加一个方法doAny（），在实现类中重写这个方法
那么在配置文件中
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<bean id="service" class="demo14.SomeServiceImpl"></bean>
<bean id="beforeAdvice" class="demo14.BeforeAdvice"></bean>
<!--与其他不一样的地方-->
<bean id="advisor" class="org.springframework.aop.support.NameMatchMethodPointcutAdvisor">
<property name="advice" ref="beforeAdvice"></property>
<property name="mappedNames" value="do*"></property>
</bean>
<bean id="proxyService" class="org.springframework.aop.framework.ProxyFactoryBean">
<property name="target" ref="service"></property>
<property name="interceptorNames" value="advisor"></property>
</bean>
</beans>
这个配置文件可以对比着之前写的配置文件看看有什么不同之处
@Test
public void t2(){
ApplicationContext context=new ClassPathXmlApplicationContext("applicationContextAdvisor.xml");
ISomeService proxyService =(ISomeService) context.getBean("proxyService");
proxyService.doSome();
proxyService.doAny();
}
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