接口
package net.blogjava.dodoma.spring.aop;

public interface HelloI {
 public String sayHello(String firstName,String lastName);
 }

实现类
package net.blogjava.dodoma.spring.aop;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class Hello implements HelloI {
 protected static final Log log=LogFactory.getLog(Hello.class);
 private String msg;
 public Hello(){}
 public Hello(String msg){
  this.msg=msg;
 }
 public String getMsg() {
  return msg;
 }
 public void setMsg(String msg) {
  this.msg = msg;
 }
 public String sayHello(String firstName, String lastName) {
  // TODO Auto-generated method stub
  log.info("in the class "+this.getClass().getName()+"'s method sayHello()");
  return (msg+" "+firstName+" "+lastName);
 }
}

BeforeAdvice通知

package net.blogjava.dodoma.spring.aop;

import java.lang.reflect.Method;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.aop.MethodBeforeAdvice;

/**
 * 方法调用之前.
 * 先调用此方法
 * @author dodoma
 **/
public class LogBeforeAdvice implements MethodBeforeAdvice {
 protected static final Log log = LogFactory.getLog(LogBeforeAdvice.class);

 public void before(Method m, Object[] args, Object target) throws Throwable {
  log.info("in the class "+this.getClass().getName()+"'s method before()");

  log.info("the target class is:" + target.getClass().getName());
  log.info("the target method is:" + m.getName());

  for (int i = 0; i < args.length; i++) {
   log.info("the method's args is:" + args[i]);
  }
  //测试,如果在before通知中发生了异常,程序流程将如何
  //throw new Exception("异常");
 }
}

测试类
package net.blogjava.dodoma.spring.aop;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.aop.framework.ProxyFactory;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;

public class HelloTest {
 protected static final Log log = LogFactory.getLog(HelloTest.class);
 public static void main(String[] args) throws Exception {
  // TODO Auto-generated method stub
 //应用spring的ioc容器
  Resource rs = new ClassPathResource("beans.xml");
  BeanFactory bf = new XmlBeanFactory(rs);

  HelloI h = (HelloI) bf.getBean("theBean");
  log.info("starting...");
  try {
   log.info(h.sayHello("ma", "bin"));
     } catch (Exception e) {
   e.printStackTrace();
  }
  log.info("end...");
  
  //如果没有使用spring的ioc,可以直接用如下代码测试
  ProxyFactory factory=new ProxyFactory();
  factory.addAdvice(new LogBeforeAdvice());//添加通知
  factory.setTarget(new Hello("hello"));//添加被代理的类实例
  try{
  HelloI hi=(HelloI)factory.getProxy();
  hi.sayHello("ma","bin");}
  catch(Exception e){e.printStackTrace();}
 }

}

spring的配置文件beans.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">

<beans>

<!--享受日志的类-->
<bean id="theTargetBean" class="net.blogjava.dodoma.spring.aop.Hello">
 <property name="msg">
     <value>hello</value>
    </property>
     
</bean>

<!--advices-->
<bean id="theLogBeforeAdvice" class="net.blogjava.dodoma.spring.aop.LogBeforeAdvice"/>

<!--CONFIG-->
  <bean id="theBean" class="org.springframework.aop.framework.ProxyFactoryBean">
    <!--接口-->
    <property name="proxyInterfaces">
      <value>net.blogjava.dodoma.spring.aop.HelloI</value>
    </property>
    <!--被代理的类-->
    <property name="target">
      <ref local="theTargetBean"/>
    </property>
    <!--加在代理类上的advice-->
    <property name="interceptorNames">
      <list>
        <value>theLogBeforeAdvice</value><!--此时直接使用advice,表明这个类所有的实例,方法,都享受advice的拦截-->
      </list>
    </property>
  </bean>
  
  <!--切入点,可以精确匹配类,方法,也可以不需要这个-->
  <!--Note: An advisor assembles pointcut and advice-->
  <bean id="theBeAdvisor" class="org.springframework.aop.support.RegexpMethodPointcutAdvisor">
    <property name="advice">
      <ref local="theLogBeforeAdvice"/>
    </property>
    <!--匹配模式-->
    <property name="pattern">
      <value>.*</value>
    </property>
  </bean>
    
</beans>