接口修改为
package net.blogjava.dodoma.spring.aop;

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

类修改为
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) throws Exception{
  // TODO Auto-generated method stub
  log.info("in the class "+this.getClass().getName()+"'s method sayHello()");
  throw new Exception("here is a exception !");
  return (msg+" "+firstName+" "+lastName);
 }
}



package net.blogjava.dodoma.spring.aop;

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

public class LogThrowAdvice implements ThrowsAdvice {
 protected static final Log log = LogFactory.getLog(LogThrowAdvice.class);
 public void afterThrowing(Exception e)throws Throwable{
  log.info("in the class "+this.getClass().getName()+"'s method afterThrowing()");
  log.info("the exception is "+e.getMessage());
 }
}


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);

 /**
  * @param args
  * @throws Exception
  */
 public static void main(String[] args) throws Exception {
  // TODO Auto-generated method stub
  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...");
  
  
  ProxyFactory factory=new ProxyFactory();
  factory.addAdvice(new LogThrowAdvice ());
  factory.setTarget(new Hello("hello"));
  try{
  HelloI hi=(HelloI)factory.getProxy();
  hi.sayHello("ma","bin");}
  catch(Exception e){e.printStackTrace();}
 }

}