Sping（七）Sping四種增強和顧問
阿新 • • 發佈：2018-03-10
實體 urn oca lB 之前 log exc -- title 
前置增強 後置增強 環繞增強 異常增強
先編寫接口和實體類 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("=================");
}
}
先來說第一個前置增強，直接用例子來說明
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();
}
運行的結果是
2.後置增強和前置增強一樣，只是改一改配置文件裏的名稱就可以
<?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.環繞增強
直接飲用上面的接口和實現類了
在創建另一個類 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("前置增強");
Object result = methodInvocation.proceed();
System.out.println("後置增強");
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.異常增強
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("網絡出現錯誤");
}
}
<?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 是顧問的意思 正對某一個方法增強
還有一個詞是通知 advice 我自己的理解是 通知視同只所有人，顧問是針對某個人顧問，這樣方便記憶
現在在ISomeService接口中在添加一個方法doAny（），在實現類中重寫這個方法
那麽在配置文件中
<?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>
<!--與其他不一樣的地方-->
<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>
這個配置文件可以對比著之前寫的配置文件看看有什麽不同之處
@Test
public void t2(){
ApplicationContext context=new ClassPathXmlApplicationContext("applicationContextAdvisor.xml");
ISomeService proxyService =(ISomeService) context.getBean("proxyService");
proxyService.doSome();
proxyService.doAny();
}
Sping（七）Sping四種增強和顧問