• advice – 指示之前或方法执行后采取的行动。
• h3cut – 指明哪些方法应该拦截，通过方法的名称或正则表达式模式。
• advisor – 分组"通知"和”切入点“成为一个单元，并把它传递到代理工厂对象。

再次回顾上一个 spring aop通知的例子。

file : customerservice.java

package com.h3.customer.services;

public class customerservice
{
	private string name;
	private string url;

	public void setname(string name) {
		this.name = name;
	}

	public void seturl(string url) {
		this.url = url;
	}

	public void printname(){
		system.out.println("customer name : " + this.name);
	}
	
	public void printurl(){
		system.out.println("customer website : " + this.url);
	}
	
	public void printthrowexception(){
		throw new illegalargumentexception();
	}
	
}

file : applicationcontext.xml

<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-2.5.xsd">

	<bean id="customerservice" class="com.h3.customer.services.customerservice">
		<property name="name" value="yong mook kim" />
		<property name="url" value="http://www.h3.com" />
	</bean>

	<bean id="hijackaroundmethodbeanadvice" class="com.h3.aop.hijackaroundmethod" />

	<bean id="customerserviceproxy" 
                class="org.springframework.aop.framework.proxyfactorybean">

		<property name="target" ref="customerservice" />

		<property name="interceptornames">
			<list>
				<value>hijackaroundmethodbeanadvice</value>
			</list>
		</property>
	</bean>
</beans>

file : hijackaroundmethod.java

package com.h3.aop;

import java.util.arrays;
import org.aopalliance.intercept.methodinterceptor;
import org.aopalliance.intercept.methodinvocation;

public class hijackaroundmethod implements methodinterceptor {
	@override
	public object invoke(methodinvocation methodinvocation) throws throwable {

		system.out.println("method name : "
				+ methodinvocation.getmethod().getname());
		system.out.println("method arguments : "
				+ arrays.tostring(methodinvocation.getarguments()));

		system.out.println("hijackaroundmethod : before method hijacked!");

		try {
			object result = methodinvocation.proceed();
			system.out.println("hijackaroundmethod : before after hijacked!");

			return result;

		} catch (illegalargumentexception e) {

			system.out.println("hijackaroundmethod : throw exception hijacked!");
			throw e;
		}
	}
}

执行它

package com.h3.common;

import org.springframework.context.applicationcontext;
import org.springframework.context.support.classpathxmlapplicationcontext;

import com.h3.customer.services.customerservice;

public class app {
	public static void main(string[] args) {
		applicationcontext appcontext = new classpathxmlapplicationcontext(
				new string[] { "applicationcontext.xml" });

		customerservice cust = (customerservice) appcontext
				.getbean("customerserviceproxy");

		system.out.println("*************************");
		cust.printname();
		system.out.println("*************************");
		cust.printurl();
		system.out.println("*************************");
		try {
			cust.printthrowexception();
		} catch (exception e) {
		}
	}
}

输出

*************************
method name : printname
method arguments : []
hijackaroundmethod : before method hijacked!
customer name : h3
hijackaroundmethod : before after hijacked!
*************************
method name : printurl
method arguments : []
hijackaroundmethod : before method hijacked!
customer website : http://www.h3.com
hijackaroundmethod : before after hijacked!
*************************
method name : printthrowexception
method arguments : []
hijackaroundmethod : before method hijacked!
hijackaroundmethod : throw exception hijacked!

切入点的例子

1. 名称匹配
2. 正则表达式匹配

1.切入点 - 名称匹配的例子

<bean id="customerh3cut"
        class="org.springframework.aop.support.namematchmethodh3cut">
		<property name="mappedname" value="printname" />
	</bean>

<bean id="customeradvisor"
		class="org.springframework.aop.support.defaulth3cutadvisor">
		<property name="pointcut" ref="customerh3cut" />
		<property name="advice" ref="hijackaroundmethodbeanadvice" />
	</bean>

<bean id="customerserviceproxy"
		class="org.springframework.aop.framework.proxyfactorybean">

		<property name="target" ref="customerservice" />
		
		<property name="interceptornames">
			<list>
				<value>customeradvisor</value>
			</list>
		</property>
	</bean>

<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-2.5.xsd">

	<bean id="customerservice" class="com.h3.customer.services.customerservice">
		<property name="name" value="h3" />
		<property name="url" value="http://www.h3.com" />
	</bean>

	<bean id="hijackaroundmethodbeanadvice" class="com.h3.aop.hijackaroundmethod" />

	<bean id="customerserviceproxy" 
                class="org.springframework.aop.framework.proxyfactorybean">

		<property name="target" ref="customerservice" />

		<property name="interceptornames">
			<list>
				<value>customeradvisor</value>
			</list>
		</property>
	</bean>

	<bean id="customerh3cut" 
                class="org.springframework.aop.support.namematchmethodh3cut">
		<property name="mappedname" value="printname" />
	</bean>

	<bean id="customeradvisor" 
                 class="org.springframework.aop.support.defaulth3cutadvisor">
		<property name="pointcut" ref="customerh3cut" />
		<property name="advice" ref="hijackaroundmethodbeanadvice" />
	</bean>

</beans>

*************************
method name : printname
method arguments : []
hijackaroundmethod : before method hijacked!
customer name : h3
hijackaroundmethod : before after hijacked!
*************************
customer website : http://www.h3.com
*************************

<bean id="customeradvisor"
		class="org.springframework.aop.support.namematchmethodh3cutadvisor">
	
		<property name="mappedname" value="printname" />
		<property name="advice" ref="hijackaroundmethodbeanadvice" />
	
	</bean>

2.切入点 - 正则表达式的例子

也可以通过使用正则表达式匹配切入点方法的名称  – regexpmethodh3cutadvisor.

<bean id="customeradvisor"
		class="org.springframework.aop.support.regexpmethodh3cutadvisor">
		<property name="patterns">
			<list>
				<value>.*url.*</value>
			</list>
		</property>

		<property name="advice" ref="hijackaroundmethodbeanadvice" />
	</bean> 

现在，它拦截方法名称中有“url”的方法。在实践中，可以用它来管理dao层，声明“.*dao.*” 拦截所有的dao类来支持事务。