接口：

public interface Knight {
    void embarkOnQuest();
}

實現類：

/**
 * Created by JackieLee on 2017/12/6.
 *
 * @author <a href="mailto:wb-lzl282164@alibaba-inc.com">李智龍</a>
 * @date 2017/12/6
 */
public class BraveKnight implements Knight {
    private Quest quest;
    // 構造方法
    public BraveKnight(Quest quest) {
        this.quest = quest;
    }
    // 實現的接口方法
    public void embarkOnQuest() {
        System.out.println("embarkOnQuest開始....");
        quest.embark();
        System.out.println("embarkOnQuest結束....");
    }
}

接口方法實現類的參數

/**
 * Created by JackieLee on 2017/12/6.
 *
 * @author <a href="mailto:wb-lzl282164@alibaba-inc.com">李智龍</a>
 * @date 2017/12/6
 */
public class SlayDragonQuest implements Quest {
    public void embark() {
        System.out.println("降服一條龍");
    }
}

xml配置

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
                           http://www.springframework.org/schema/aop
                           http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">

    <bean id="knight" class="com.jackie.impl.BraveKnight">
        <constructor-arg ref="quest"/>
    </bean>
    <bean id="quest" class="com.jackie.impl.SlayDragonQuest"/>
    <!--聲明Minstrel（切點）-->
    <bean id="minstrel" class="com.jackie.clazz.Minstrel"/>
    <aop:config>
        <aop:aspect ref="minstrel">
            <!--定義切面-->
            <aop:pointcut id="embark" expression="execution(* *.embarkOnQuest(..))"/>
            <!--聲明前置通知（執行embarkOnQuest方法前的操作）-->
            <aop:before method="singBeforeQuest" pointcut-ref="embark"/>
            <!--聲明后置通知（執行embarkOnQuest方法后的操作）-->
            <aop:after method="singAfterQuest" pointcut-ref="embark"/>
        </aop:aspect>
    </aop:config>
</beans>

測試：

 @Test
    public void kinghtTest(){
        ApplicationContext context = new ClassPathXmlApplicationContext("knights.xml");
        Knight knight = (Knight) context.getBean("knight");
        knight.embarkOnQuest();
    }

執行結果：

吟游詩人唱到：勇敢的騎士沖啊
embarkOnQuest開始....
降服一條龍
embarkOnQuest結束....
吟游詩人唱到：騎士失敗而歸

做切面編程aop的時候報
java.lang.NoClassDefFoundError: org/aspectj/weaver/BCException錯
缺少aspectjweaver-1.8.9.jar包或者缺少maven依賴

本文參考：《Spring實戰》