概述
StaticMethodMatcherPointcutAdvisor代表一个静态方法匹配切面,它通过StaticMethodMatcherPointcut来定义切点,并通过类过滤和方法名来匹配所定义的切点.
实例
代码已托管到Github—> https://github.com/yangshangwei/SpringMaster
我们假设我们业务类中 Waiter和 Seller中都有同名的greetTo()方法.
业务类Waiter
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package com.xgj.aop.spring.advisor.StaticMethodMatcherPointcutAdvisor;
public class Waiter {
/**
*
*
* @Title: greetTo
*
* @Description:
*
* @param name
*
* @return: void
*/
public void greetTo(String name) {
System.out.println( "Waiter Greet to " + name);
}
/**
*
*
* @Title: serverTo
*
* @Description:
*
* @param name
*
* @return: void
*/
public void serverTo(String name) {
System.out.println( "Waiter Server to " + name);
}
}
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业务类Seller
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package com.xgj.aop.spring.advisor.StaticMethodMatcherPointcutAdvisor;
public class Seller {
/**
*
*
* @Title: greetTo
*
* @Description: 和Waiter类中的同名的方法,目的是为了验证仅仅织入了Waiter类中的greetTo方法
*
* @param name
*
* @return: void
*/
public void greetTo(String name) {
System.out.println( "Seller Greet to " + name);
}
}
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现在我们希望通过StaticMethodMatcherPointcutAdvisor定义一个切面,在Waiter#greetTo()方法调用前织入一个增强,即连接点为Waiter#greetTo()方法调用前的位置。
切面代码
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package com.xgj.aop.spring.advisor.StaticMethodMatcherPointcutAdvisor;
import java.lang.reflect.Method;
import org.springframework.aop.ClassFilter;
import org.springframework.aop.support.StaticMethodMatcherPointcutAdvisor;
/**
*
*
* @ClassName: GreetingAdvisor
*
* @Description: 切面类
*
* @author: Mr.Yang
*
* @date: 2017年8月18日 下午8:27:52
*/
public class GreetingAdvisor extends StaticMethodMatcherPointcutAdvisor {
private static final long serialVersionUID = 1L;
/**
* 重写matches方法,切点方法匹配规则:方法名为greetTo
*/
@Override
public boolean matches(Method method, Class<?> targetClass) {
return "greetTo" .equals(method.getName());
}
/**
* 默认情况下,匹配所有的类,重写getClassFilter,定义匹配规则 切点类型匹配规则,为Waiter的类或者之类
*/
public ClassFilter getClassFilter() {
return new ClassFilter() {
@Override
public boolean matches(Class<?> clazz) {
return Waiter. class .isAssignableFrom(clazz);
}
};
}
}
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StaticMethodMatcherPointcutAdvisor 抽象类唯一需要定义的是matches()方法,在默认情况下,该切面匹配所有的类,这里通过覆盖getClassFilter()方法,让它仅匹配Waiter类及其子类。
当然,Advisor还需要一个增强类的配合 .
我们来定义一个前置增强
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package com.xgj.aop.spring.advisor.StaticMethodMatcherPointcutAdvisor;
import java.lang.reflect.Method;
import org.springframework.aop.MethodBeforeAdvice;
/**
*
*
* @ClassName: GreetBeforeAdivce
*
* @Description: 前置增强
*
* @author: Mr.Yang
*
* @date: 2017年8月18日 下午8:27:40
*/
public class GreetBeforeAdivce implements MethodBeforeAdvice {
@Override
public void before(Method method, Object[] args, Object target)
throws Throwable {
// 输出切点
System.out.println( "Pointcut:" + target.getClass().getName() + "."
+ method.getName());
String clientName = (String) args[ 0 ];
System.out.println( "How are you " + clientName + " ?" );
}
}
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我们使用Spring配置来定义切面等信息
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<? xml version = "1.0" encoding = "UTF-8" ?>
< beans xmlns = "http://www.springframework.org/schema/beans"
xmlns:p = "http://www.springframework.org/schema/p"
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.xsd" >
<!-- 配置切面:静态方法匹配切面 -->
<!-- Waiter目标类 -->
< bean id = "waiterTarget" class = "com.xgj.aop.spring.advisor.StaticMethodMatcherPointcutAdvisor.Waiter" />
<!-- Seller目标类 -->
< bean id = "sellerTarget" class = "com.xgj.aop.spring.advisor.StaticMethodMatcherPointcutAdvisor.Seller" />
<!-- 前置增强 -->
< bean id = "greetBeforeAdvice" class = "com.xgj.aop.spring.advisor.StaticMethodMatcherPointcutAdvisor.GreetBeforeAdivce" />
<!-- 切面 -->
< bean id = "greetAdvicesor" class = "com.xgj.aop.spring.advisor.StaticMethodMatcherPointcutAdvisor.GreetingAdvisor"
p:advice-ref = "greetBeforeAdvice" /> <!-- 向切面注入一个前置增强 -->
<!-- 通过父bean,配置公共的信息 -->
< bean id = "parent" abstract = "true"
class = "org.springframework.aop.framework.ProxyFactoryBean"
p:interceptorNames = "greetAdvicesor"
p:proxyTargetClass = "true" />
<!-- waiter代理 -->
< bean id = "waiter" parent = "parent" p:target-ref = "waiterTarget" />
<!-- seller代理 -->
< bean id = "seller" parent = "parent" p:target-ref = "sellerTarget" />
</ beans >
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单元测试类
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package com.xgj.aop.spring.advisor.StaticMethodMatcherPointcutAdvisor;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
/**
*
*
* @ClassName: StaticMethodMatcherPointcutAdvisorTest
*
* @Description: 测试类
*
* @author: Mr.Yang
*
* @date: 2017年8月18日 下午8:29:28
*/
public class StaticMethodMatcherPointcutAdvisorTest {
@Test
public void test() {
// 加载配置文件,启动容器
ApplicationContext ctx = new ClassPathXmlApplicationContext(
"classpath:com/xgj/aop/spring/advisor/StaticMethodMatcherPointcutAdvisor/conf-advisor.xml" );
// 从容器中获取Bean
Waiter waiter = ctx.getBean( "waiter" , Waiter. class );
Seller seller = ctx.getBean( "seller" , Seller. class );
// 调用业务方法
waiter.greetTo( "XiaoGongJiang" );
waiter.serverTo( "XiaoGongJiang" );
seller.greetTo( "XiaoGongJiang" );
}
}
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运行结果:
我们可以看到切面仅仅织入了Wwaiter.greetTo()方法调用前的连接点上, Waiter.serverTo()和Seller.greetTo()方法并没有织入切面。
以上为个人经验,希望能给大家一个参考,也希望大家多多支持服务器之家。
原文链接:https://artisan.blog.csdn.net/article/details/77393421