通知
1、Around 攔截對目標方法調用
2、Before 在目標方法調用前調用
3、After 在目標方法調用後調用
4、Throws 當目標方法拋出異常時調用
before
代理對象:(proxyFactoryBeans)只需配置,無需寫,使用動態代理技術
編程說明:
1、定義接口
2、編寫對象(被代理對象)
3、編寫通知(前置通知在調用前執行)
4、在beans.xml中配置
//前置通知
public class MyMethodBeforeAdvice implements MethodBeforeAdvice {
/**
* method: 被調用方法名字
* args: 給method傳遞的參數
* target: 目標對象
*/
public void before(Method method, Object[] args, Object target)
throws Throwable {
// TODO Auto-generated method stub
System.out.println("記錄日誌..."+method.getName());
}
}
//後置通知
public class MyAfterReturnAdvices implements AfterReturningAdvice{
@Override
public void afterReturning(Object arg0, Method method, Object[] args,
Object target) throws Throwable {
System.out.println("關閉資源");
}
}
//環繞通知
public class MyMethodInterceptor implements MethodInterceptor {
@Override
public Object invoke(MethodInvocation arg0) throws Throwable {
System.out.println("環繞通知調用前");
Object obj=arg0.proceed();
System.out.println("環繞通知調用後");
return obj;
}
}
//異常通知
public class MyThrowsAdvice implements ThrowsAdvice{
public void afterThrowing(Method method, Object[] args, Object target,Exception e){
System.out.println("?????????");
System.out.println("有異常"+e.getMessage());
}
}
public interface TestServiceInter {
public void sayHello();
}
1、被代理對象的對象
public class Test1Service implements TestServiceInter,TestServiceInter2 {
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public void sayHello() {
System.out.println("hi "+name);
}
public void sayBye() {
System.out.println("bye "+name);
}
}
beans.xml的內容、
1、被代理對象的對象
2、前置通知
3、代理對象
<?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:tx="http://www.springframework.org/schema/tx"
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/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd"
>
<!-- 配置被代理的對象 -->
<bean id="test1Service" class="com.hsp.aop.Test1Service">
<property name="name" value="順平" />
</bean>
<!-- 配置前置通知 -->
<bean id="MyMethodBeforeAdvice" class="com.hsp.aop.MyMethodBeforeAdvice" />
<!-- 配置代理對象 -->
<bean id="proxyFactoryBean" class="org.springframework.aop.framework.ProxyFactoryBean">
</bean>
<!-- 配置後置通知-->
<bean id="myAfterReturnAdvices" class="com.hsp.aop.MyAfterReturnAdvices">
</bean>
<!-- 代理接口集 -->
<property name="proxyInterfaces">
<list>
<value>com.hsp.aop.TestServiceInter</value>
<value>com.hsp.aop.TestServiceInter2</value>
</list>
</property>
<!-- 把通知織入到代理對象 -->
<property name="interceptorNames">
<!-- 相當於包MyMethodBeforeAdvice前置通知和代理對象關聯,我們也
可以把通知看出攔截器,struts2核心攔截器 -->
<!--<value>MyMethodBeforeAdvice</value> -->
<list>
<!-- 織入前置通知 -->
<value>MyMethodBeforeAdvice</value>
<!-- 織入後置通知 -->
<value>myAfterReturnAdvices</value>
<!-- 織入環繞通知 -->
<value>myMethodInterceptor</value>
<!-- 織入異常通知 -->
<value>myThrowsAdvice</value>
</list>
</property>
<!-- 配置被代理對象,可以指定 -->
<property name="target" ref="test1Service"/>
</bean>
</beans>
擴展:加一個接口,在接口集里加入
public interface TestServiceInter2 {
public void sayBye();
}
測試
public static void main(String[] args) {
// TODO Auto-generated method stub
ApplicationContext ac=new ClassPathXmlApplicationContext("com/hsp/aop/beans.xml");
TestServiceInter ts=(TestServiceInter) ac.getBean("proxyFactoryBean");
ts.sayHello();
((TestServiceInter2)ts).sayBye();
}
//引入通知
<!-- 只有sayBye這個方法調用前置通知 -->
<!-- 定義切入點 -->
<bean id="MyMethodBeforeAdviceFilter" class="org.springframework.aop.support.NameMatchMethodPointcutAdvisor">
<property name="advice" ref="MyMethodBeforeAdvice"></property>
<property name="mappedNames">
<list>
<value>sayBye</value>
</list>
</property>
</bean>