Spring AOP切面的时候参数的传递

Spring AOP切面的时候参数的传递

Xml：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.springframework.org/schema/beans" xmlns:p="http://www.springframework.org/schema/p"
    xmlns:util="http://www.springframework.org/schema/util" xmlns:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop"
    xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.1.xsd
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
        http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.1.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd">
    <bean id="volunteer" class="com.stono.sprtest2.Volunteer"></bean>
    <bean id="magician" class="com.stono.sprtest2.Magician"></bean>
    <bean id="singer" class="com.stono.sprtest2.Singer"></bean>
    <aop:config>
        <aop:aspect ref="magician">
            <aop:pointcut expression="execution(* com.stono.sprtest2.Thinker.thinkOfSomething(String)) and args(thoughts)" id="thinking" />
            <aop:before method="interceptThoughts" pointcut-ref="thinking" arg-names="thoughts" />
        </aop:aspect>
    </aop:config>
</beans>

AppBean：

package com.stono.sprtest2;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class AppBeans10 {
    @SuppressWarnings("resource")
    public static void main(String[] args) {
        ApplicationContext context = new ClassPathXmlApplicationContext("appbeans10.xml");
        // 在AOP情况下，如果有接口就必须用接口来接，否则会报ClassCastException；
        Thinker bean = (Thinker) context.getBean("volunteer");
        bean.thinkOfSomething("volunteer think of something");
        MindReader bean2 = (MindReader) context.getBean("magician");
        String thoughts = bean2.getThoughts();
        System.out.println(thoughts);
        // 没有接口的Bean还是可以用类的；
        Singer bean3 = (Singer) context.getBean("singer");
        bean3.perform();
    }
}

POJO：

package com.stono.sprtest2;

public interface Thinker {
    void thinkOfSomething(String thoughts);
}

package com.stono.sprtest2;

public class Volunteer implements Thinker {
    private String thoughts;
    @Override
    public void thinkOfSomething(String thoughts) {
        this.thoughts = thoughts;
    }
    public String getThoughts() {
        return thoughts;
    }
}

AOP：

package com.stono.sprtest2;

public interface MindReader {
    void interceptThoughts(String thoughts);
    String getThoughts();
}

package com.stono.sprtest2;

public class Magician implements MindReader {
    private String thoughts;
    @Override
    public void interceptThoughts(String thoughts) {
        System.out.println("Intercepting volunteer's thoughts");
        this.thoughts = thoughts;
    }
    @Override
    public String getThoughts() {
        return thoughts;
    }
}