• Spring aop:decare-parent 为类增加新的方法


    Spring aop:decare-parent 为类增加新的方法:

    使用XML配置的方式:

    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">
        <context:component-scan base-package="com.stono.sprtest2"></context:component-scan>
        <aop:config>
            <aop:aspect>
                <aop:declare-parents types-matching="com.stono.sprtest2.Singer" implement-interface="com.stono.sprtest2.IntroduceI" default-impl="com.stono.sprtest2.IntroduceImpl" />
                <aop:declare-parents types-matching="com.stono.sprtest2.Singer" implement-interface="com.stono.sprtest2.Introduce2I" delegate-ref="intro2" />
            </aop:aspect>
        </aop:config>
        <bean id="intro2" class="com.stono.sprtest2.Introduce2Impl"></bean>
    </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");
            Singer singer = (Singer) context.getBean("singer");
            IntroduceI introduceI = (IntroduceI) singer;
            introduceI.intro();
            Introduce2I introduce2i = (Introduce2I) singer;
            introduce2i.intro2();
        }
    }

    Bean:

    package com.stono.sprtest2;
    import org.springframework.stereotype.Component;
    @Component
    public class Singer {
        public void perform() {
            System.out.println("com.stono.sprtest2.Singer.Perform()");
        }
    }

    Interface and Implements:

    其中的方法名称不能一致,可能会引起混淆,会把第二个Impl的方法误认为第一个Impl的方法。

    package com.stono.sprtest2;
    public interface IntroduceI {
        void intro();
    }
    package com.stono.sprtest2;
    public class IntroduceImpl implements IntroduceI {
        @Override
        public void intro() {
            System.out.println("this is default introduce!");
        }
    }
    package com.stono.sprtest2;
    public interface Introduce2I {
        // 这个方法名称不能是intro(),否则可能把这个方法误认为是IntroduceI的方法;
        void intro2();
    }
    package com.stono.sprtest2;
    public class Introduce2Impl implements Introduce2I {
        @Override
        public void intro2() {
            System.out.println("this is default introduce2 impl.");
        }
    }
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  • 原文地址:https://www.cnblogs.com/stono/p/4857391.html
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