Spring 各种Advice示例

直接上代码

package com.dada.test.spring.aop.advisor;import java.lang.reflect.Method;import org.springframework.aop.AfterReturningAdvice; public class MyAfterAdvice implements AfterReturningAdvice{public void afterReturning(Object result, Method method,Object[] parameter, Object target) throws Throwable {System.out.println("==============after return==============");System.out.println("result:" + result + ";method:" + method+ ";parameter:" + parameter + ";target:" + target);}}

 

package com.dada.test.spring.aop.advisor;import java.util.HashSet;import java.util.Set;import org.aopalliance.intercept.MethodInterceptor;import org.aopalliance.intercept.MethodInvocation; public class MyAroundAdvice implements MethodInterceptor{    private Set set=new HashSet();    public Object invoke(MethodInvocation method) throws Throwable    {        set.add(method);        System.out.println("============around before==========");        Object result=method.proceed();        System.out.println("============around after==========");        return result;    }}

 

package com.dada.test.spring.aop.advisor;import java.lang.reflect.Method;import org.springframework.aop.MethodBeforeAdvice; public class MyBeforeAdvice implements MethodBeforeAdvice{       public void before(Method method, Object[] parameters, Object target) throws Throwable    {        System.err.println("==========before===========");        System.out.println(method.getName());        System.out.println(parameters.length);        System.out.println(target);    }}

 

package com.dada.test.spring.aop.advisor;import org.springframework.aop.ThrowsAdvice;import com.dada.test.spring.aop.MyException;public class MyThrowsAdvice implements ThrowsAdvice{    public void afterThrowing(MyException e)    { // 可以定义多个方法，只要传入的参数是不同异常        System.err.println("MyThrowsAdvice:"+e.toString());    }     public void afterThrowing(RuntimeException e)    {        // 可以定义多个方法，只要传入的参数是不同异常        System.err.print("RuntimeException!");    }}

 

package com.dada.test.spring.aop.service;public interface IService {String doSth();  void doA();}

 

package com.dada.test.spring.aop.service;import com.dada.test.spring.aop.MyException;public class MyServiceImpl implements IService{ public String doSth()  {    System.out.println(this);    System.out.println("MyServiceImpl doSth");    return "cindy";  } public void doA()  {System.out.println("MyServiceImpl doA");    throw new MyException("111111111");  }}

 

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd"><beans default-lazy-init="true">    <bean name="beforeAdvice" class="com.dada.test.spring.aop.advisor.MyBeforeAdvice" />    <bean name="aroundAdvice" class="com.dada.test.spring.aop.advisor.MyAroundAdvice" />    <bean name="afterAdvice" class="com.dada.test.spring.aop.advisor.MyAfterAdvice" />    <bean name="throwsAdvice" class="com.dada.test.spring.aop.advisor.MyThrowsAdvice" />    <bean id="servTarget" class="com.dada.test.spring.aop.service.MyServiceImpl" />    <bean id="invoker"        class="org.springframework.aop.framework.ProxyFactoryBean">        <property name="proxyInterfaces" value="com.dada.test.spring.aop.service.IService" />        <property name="target" ref="servTarget" />        <property name="singleton" value="false" />        <property name="interceptorNames">          <list>            <value>beforeAdvice</value>            <value>aroundAdvice</value>            <value>afterAdvice</value>            <value>afterAdvice</value>            <value>throwsAdvice</value>        </list>        </property>    </bean></beans>

 

package com.dada.test.spring.aop;import org.springframework.context.support.ClassPathXmlApplicationContext;import com.dada.test.spring.aop.service.IService;public class TestSpringAop {public static void main(String[] args) throws Exception{    ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext(new String[]    {        "com/dada/test/spring/aop/aop-context.xml"    });    IService ser = (IService) ctx.getBean("invoker");    String rs = ser.doSth();    System.out.println("rs="+rs.toString());       try    {        ser.doA();    }    catch (Throwable t)    {        t.printStackTrace();    }    }}

运行结果如下：

2013-7-18 23:21:06 org.springframework.context.support.AbstractApplicationContext prepareRefresh
信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@14ed9ff: display name [org.springframework.context.support.ClassPathXmlApplicationContext@14ed9ff]; startup date [Thu Jul 18 23:21:06 CST 2013]; root of context hierarchy
2013-7-18 23:21:06 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
信息: Loading XML bean definitions from class path resource [com/dada/test/spring/aop/aop-context.xml]
2013-7-18 23:21:07 org.springframework.context.support.AbstractApplicationContext obtainFreshBeanFactory
信息: Bean factory for application context [org.springframework.context.support.ClassPathXmlApplicationContext@14ed9ff]:org.springframework.beans.factory.support.DefaultListableBeanFactory@12152e6
2013-7-18 23:21:07 org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
信息: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@12152e6: defining beans [beforeAdvice,aroundAdvice,afterAdvice,throwsAdvice,servTarget,invoker]; root of factory hierarchy
2013-7-18 23:21:07 org.springframework.aop.framework.ProxyFactoryBean getObject
警告: Using non-singleton proxies with singleton targets is often undesirable.Enable prototype proxies by setting the 'targetName' property.
==========before===========
doSth
0
com.dada.test.spring.aop.service.MyServiceImpl@6f7ce9
============around before==========
com.dada.test.spring.aop.service.MyServiceImpl@6f7ce9
MyServiceImpl doSth
==============after return==============
result:cindy;method:public abstract java.lang.String com.dada.test.spring.aop.service.IService.doSth();parameter:[Ljava.lang.Object;@1dfafd1;target:com.dada.test.spring.aop.service.MyServiceImpl@6f7ce9
==============after return==============
result:cindy;method:public abstract java.lang.String com.dada.test.spring.aop.service.IService.doSth();parameter:[Ljava.lang.Object;@8fce95;target:com.dada.test.spring.aop.service.MyServiceImpl@6f7ce9
============around after==========
rs=cindy
==========before===========
doA
0
com.dada.test.spring.aop.service.MyServiceImpl@6f7ce9
============around before==========
MyServiceImpl doA
MyThrowsAdvice:com.dada.test.spring.aop.MyException: 111111111
com.dada.test.spring.aop.MyException: 111111111
 at com.dada.test.spring.aop.service.MyServiceImpl.doA(MyServiceImpl.java:17)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:585)
 at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:304)
 at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
 at org.springframework.aop.framework.adapter.ThrowsAdviceInterceptor.invoke(ThrowsAdviceInterceptor.java:126)
 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
 at org.springframework.aop.framework.adapter.AfterReturningAdviceInterceptor.invoke(AfterReturningAdviceInterceptor.java:50)
 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
 at org.springframework.aop.framework.adapter.AfterReturningAdviceInterceptor.invoke(AfterReturningAdviceInterceptor.java:50)
 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
 at com.dada.test.spring.aop.advisor.MyAroundAdvice.invoke(MyAroundAdvice.java:15)
 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
 at org.springframework.aop.framework.adapter.MethodBeforeAdviceInterceptor.invoke(MethodBeforeAdviceInterceptor.java:50)
 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
 at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
 at $Proxy0.doA(Unknown Source)
 at com.dada.test.spring.aop.TestSpringAop.main(TestSpringAop.java:21)

after return出现了2次请注意，思考下是什么原因