Introductions（引用），在 Aspect 中称为类型间的声明，使切面能够声明被通知的对象（拦截的对象）实现给定的接口，并提供该接口的实现。

　　简单点说可以将一个类的实现方法复制到未实现的类中。

　　通过 @DeclareParents 注解进行声明，声明在一个父类型的属性上（比如接口），其中注解的属性 value 指定对哪些路径（包）下的类进行类方法扩展，defaultImpl 指定以哪个类为模板。

　　如下案例：

　　1）切面类：

@Aspect
@Component
public class LogAspects {
@DeclareParents(value = "com.hrh.aop.*", defaultImpl = IndexDao.class)
public static Dao dao;

@Pointcut("execution(public \* com.hrh.aop.\*.\*(..))")  
public void pointcut() {

}

@Before("pointcut()")  
public void LogStart() {  
    System.out.println("LogStart...");  
}  

}

　　2）接口和实现类：

public interface Dao{
void query();
}

@Repository
public class IndexDao implements Dao{
public void query(){
System.out.println("query："+this.getClass().getSimpleName());
}
}

　　3）配置类：

@Configuration
@EnableAspectJAutoProxy
@ComponentScan("com.hrh.aop")
public class Config {
}

　　4）空类：

@Repository("orderDao")
public class OrderDao{}

　　5）测试和结果：

public static void main(String\[\] args) {  
    AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(Config.class);  
    Dao bean = (Dao) context.getBean("indexDao");  
    bean.query();  
    System.out.println("----------");  
    Dao dao = (Dao) context.getBean("orderDao");  
    dao.query();  
}  
=========结果==========  
LogStart...  
query：IndexDao  
----------  
query：IndexDao

　　根据前文Spring笔记(3) - SpringAOP基础详解和源码探究可以得知如下：

• @EnableAspectJAutoProxy(proxyTargetClass=false)，表示使用JDK动态代理（默认）；

• @EnableAspectJAutoProxy(proxyTargetClass=true)，表示使用CGLIB代理；

  　　debug运行后查看beanFactory的OrderDao和IndexDao代理后的对象，如下图：

　　从上面可以看到IndexDao的对象是使用JDK代理的，而OrderDao的对象是CGLIB代理的。

　　那么当设置@EnableAspectJAutoProxy(proxyTargetClass=true)时，是如下图：

　　由此可以判定@DeclareParents注解给拦截到的类进行代理使用的是CGLIB代理（其实OrderDao没有实现任何接口，所以最终实现的是CGLIB），那么可以查看下代理类生成的内容是什么，可以在context前面加一行代码将代理类class文件存入本地磁盘：

    System.setProperty(DebuggingClassWriter.DEBUG\_LOCATION\_PROPERTY, "xxx");//xxx是存放代理类class的本地路径  
    AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(Config.class);

　　下面是代理类class反编译后的完整代码（感兴趣可以完全打开，完全的很多内容，包含了各种父类的方法，比如toString、clone、equals、hashCode）：

//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by Fernflower decompiler)
//

package com.hrh.aop;

import java.lang.reflect.Method;
import java.lang.reflect.UndeclaredThrowableException;
import org.aopalliance.aop.Advice;
import org.springframework.aop.Advisor;
import org.springframework.aop.SpringProxy;
import org.springframework.aop.TargetClassAware;
import org.springframework.aop.TargetSource;
import org.springframework.aop.framework.Advised;
import org.springframework.aop.framework.AopConfigException;
import org.springframework.cglib.core.ReflectUtils;
import org.springframework.cglib.core.Signature;
import org.springframework.cglib.proxy.Callback;
import org.springframework.cglib.proxy.Dispatcher;
import org.springframework.cglib.proxy.Factory;
import org.springframework.cglib.proxy.MethodInterceptor;
import org.springframework.cglib.proxy.MethodProxy;
import org.springframework.cglib.proxy.NoOp;

public class OrderDao$$EnhancerBySpringCGLIB$$ee33136 extends OrderDao implements Dao, SpringProxy, Advised, Factory {
private boolean CGLIB$BOUND;
public static Object CGLIB$FACTORY_DATA;
private static final ThreadLocal CGLIB$THREAD_CALLBACKS;
private static final Callback[] CGLIB$STATIC_CALLBACKS;
private MethodInterceptor CGLIB$CALLBACK_0;
private MethodInterceptor CGLIB$CALLBACK_1;
private NoOp CGLIB$CALLBACK_2;
private Dispatcher CGLIB$CALLBACK_3;
private Dispatcher CGLIB$CALLBACK_4;
private MethodInterceptor CGLIB$CALLBACK_5;
private MethodInterceptor CGLIB$CALLBACK_6;
private static Object CGLIB$CALLBACK_FILTER;
private static final Method CGLIB$equals$0$Method;
private static final MethodProxy CGLIB$equals$0$Proxy;
private static final Object[] CGLIB$emptyArgs;
private static final Method CGLIB$toString$1$Method;
private static final MethodProxy CGLIB$toString$1$Proxy;
private static final Method CGLIB$hashCode$2$Method;
private static final MethodProxy CGLIB$hashCode$2$Proxy;
private static final Method CGLIB$clone$3$Method;
private static final MethodProxy CGLIB$clone$3$Proxy;
private static final Method CGLIB$query$4$Method;
private static final MethodProxy CGLIB$query$4$Proxy;

static void CGLIB$STATICHOOK5() {  
    CGLIB$THREAD\_CALLBACKS = new ThreadLocal();  
    CGLIB$emptyArgs = new Object\[0\];  
    Class var0 = Class.forName("com.hrh.aop.OrderDao$$EnhancerBySpringCGLIB$$ee33136");  
    Class var1;  
    Method\[\] var10000 = ReflectUtils.findMethods(new String\[\]{"equals", "(Ljava/lang/Object;)Z", "toString", "()Ljava/lang/String;", "hashCode", "()I", "clone", "()Ljava/lang/Object;"}, (var1 = Class.forName("java.lang.Object")).getDeclaredMethods());  
    CGLIB$equals$0$Method = var10000\[0\];  
    CGLIB$equals$0$Proxy = MethodProxy.create(var1, var0, "(Ljava/lang/Object;)Z", "equals", "CGLIB$equals$0");  
    CGLIB$toString$1$Method = var10000\[1\];  
    CGLIB$toString$1$Proxy = MethodProxy.create(var1, var0, "()Ljava/lang/String;", "toString", "CGLIB$toString$1");  
    CGLIB$hashCode$2$Method = var10000\[2\];  
    CGLIB$hashCode$2$Proxy = MethodProxy.create(var1, var0, "()I", "hashCode", "CGLIB$hashCode$2");  
    CGLIB$clone$3$Method = var10000\[3\];  
    CGLIB$clone$3$Proxy = MethodProxy.create(var1, var0, "()Ljava/lang/Object;", "clone", "CGLIB$clone$3");  
    CGLIB$query$4$Method = ReflectUtils.findMethods(new String\[\]{"query", "()V"}, (var1 = Class.forName("com.hrh.aop.Dao")).getDeclaredMethods())\[0\];  
    CGLIB$query$4$Proxy = MethodProxy.create(var1, var0, "()V", "query", "CGLIB$query$4");  
}

final boolean CGLIB$equals$0(Object var1) {  
    return super.equals(var1);  
}

public final boolean equals(Object var1) {  
    try {  
        MethodInterceptor var10000 = this.CGLIB$CALLBACK\_5;  
        if (this.CGLIB$CALLBACK\_5 == null) {  
            CGLIB$BIND\_CALLBACKS(this);  
            var10000 = this.CGLIB$CALLBACK\_5;  
        }

        if (var10000 != null) {  
            Object var4 = var10000.intercept(this, CGLIB$equals$0$Method, new Object\[\]{var1}, CGLIB$equals$0$Proxy);  
            return var4 == null ? false : (Boolean)var4;  
        } else {  
            return super.equals(var1);  
        }  
    } catch (Error | RuntimeException var2) {  
        throw var2;  
    } catch (Throwable var3) {  
        throw new UndeclaredThrowableException(var3);  
    }  
}

final String CGLIB$toString$1() {  
    return super.toString();  
}

public final String toString() {  
    try {  
        MethodInterceptor var10000 = this.CGLIB$CALLBACK\_0;  
        if (this.CGLIB$CALLBACK\_0 == null) {  
            CGLIB$BIND\_CALLBACKS(this);  
            var10000 = this.CGLIB$CALLBACK\_0;  
        }

        return var10000 != null ? (String)var10000.intercept(this, CGLIB$toString$1$Method, CGLIB$emptyArgs, CGLIB$toString$1$Proxy) : super.toString();  
    } catch (Error | RuntimeException var1) {  
        throw var1;  
    } catch (Throwable var2) {  
        throw new UndeclaredThrowableException(var2);  
    }  
}

final int CGLIB$hashCode$2() {  
    return super.hashCode();  
}

public final int hashCode() {  
    try {  
        MethodInterceptor var10000 = this.CGLIB$CALLBACK\_6;  
        if (this.CGLIB$CALLBACK\_6 == null) {  
            CGLIB$BIND\_CALLBACKS(this);  
            var10000 = this.CGLIB$CALLBACK\_6;  
        }

        if (var10000 != null) {  
            Object var3 = var10000.intercept(this, CGLIB$hashCode$2$Method, CGLIB$emptyArgs, CGLIB$hashCode$2$Proxy);  
            return var3 == null ? 0 : ((Number)var3).intValue();  
        } else {  
            return super.hashCode();  
        }  
    } catch (Error | RuntimeException var1) {  
        throw var1;  
    } catch (Throwable var2) {  
        throw new UndeclaredThrowableException(var2);  
    }  
}

final Object CGLIB$clone$3() throws CloneNotSupportedException {  
    return super.clone();  
}

protected final Object clone() throws CloneNotSupportedException {  
    try {  
        MethodInterceptor var10000 = this.CGLIB$CALLBACK\_0;  
        if (this.CGLIB$CALLBACK\_0 == null) {  
            CGLIB$BIND\_CALLBACKS(this);  
            var10000 = this.CGLIB$CALLBACK\_0;  
        }

        return var10000 != null ? var10000.intercept(this, CGLIB$clone$3$Method, CGLIB$emptyArgs, CGLIB$clone$3$Proxy) : super.clone();  
    } catch (Error | CloneNotSupportedException | RuntimeException var1) {  
        throw var1;  
    } catch (Throwable var2) {  
        throw new UndeclaredThrowableException(var2);  
    }  
}

final void CGLIB$query$4() {  
    super.query();  
}

public final void query() {  
    try {  
        MethodInterceptor var10000 = this.CGLIB$CALLBACK\_0;  
        if (this.CGLIB$CALLBACK\_0 == null) {  
            CGLIB$BIND\_CALLBACKS(this);  
            var10000 = this.CGLIB$CALLBACK\_0;  
        }

        if (var10000 != null) {  
            var10000.intercept(this, CGLIB$query$4$Method, CGLIB$emptyArgs, CGLIB$query$4$Proxy);  
        } else {  
            super.query();  
        }  
    } catch (Error | RuntimeException var1) {  
        throw var1;  
    } catch (Throwable var2) {  
        throw new UndeclaredThrowableException(var2);  
    }  
}

public static MethodProxy CGLIB$findMethodProxy(Signature var0) {  
    String var10000 = var0.toString();  
    switch(var10000.hashCode()) {  
    case -1166709331:  
        if (var10000.equals("query()V")) {  
            return CGLIB$query$4$Proxy;  
        }  
        break;  
    case -508378822:  
        if (var10000.equals("clone()Ljava/lang/Object;")) {  
            return CGLIB$clone$3$Proxy;  
        }  
        break;  
    case 1826985398:  
        if (var10000.equals("equals(Ljava/lang/Object;)Z")) {  
            return CGLIB$equals$0$Proxy;  
        }  
        break;  
    case 1913648695:  
        if (var10000.equals("toString()Ljava/lang/String;")) {  
            return CGLIB$toString$1$Proxy;  
        }  
        break;  
    case 1984935277:  
        if (var10000.equals("hashCode()I")) {  
            return CGLIB$hashCode$2$Proxy;  
        }  
    }

    return null;  
}

public final int indexOf(Advice var1) {  
    try {  
        Dispatcher var10000 = this.CGLIB$CALLBACK\_4;  
        if (this.CGLIB$CALLBACK\_4 == null) {  
            CGLIB$BIND\_CALLBACKS(this);  
            var10000 = this.CGLIB$CALLBACK\_4;  
        }

        return ((Advised)var10000.loadObject()).indexOf(var1);  
    } catch (Error | RuntimeException var2) {  
        throw var2;  
    } catch (Throwable var3) {  
        throw new UndeclaredThrowableException(var3);  
    }  
}

public final int indexOf(Advisor var1) {  
    try {  
        Dispatcher var10000 = this.CGLIB$CALLBACK\_4;  
        if (this.CGLIB$CALLBACK\_4 == null) {  
            CGLIB$BIND\_CALLBACKS(this);  
            var10000 = this.CGLIB$CALLBACK\_4;  
        }

        return ((Advised)var10000.loadObject()).indexOf(var1);  
    } catch (Error | RuntimeException var2) {  
        throw var2;  
    } catch (Throwable var3) {  
        throw new UndeclaredThrowableException(var3);  
    }  
}

public final boolean isFrozen() {  
    try {  
        Dispatcher var10000 = this.CGLIB$CALLBACK\_4;  
        if (this.CGLIB$CALLBACK\_4 == null) {  
            CGLIB$BIND\_CALLBACKS(this);  
            var10000 = this.CGLIB$CALLBACK\_4;  
        }

        return ((Advised)var10000.loadObject()).isFrozen();  
    } catch (Error | RuntimeException var1) {  
        throw var1;  
    } catch (Throwable var2) {  
        throw new UndeclaredThrowableException(var2);  
    }  
}

public final void setTargetSource(TargetSource var1) {  
    try {  
        Dispatcher var10000 = this.CGLIB$CALLBACK\_4;  
        if (this.CGLIB$CALLBACK\_4 == null) {  
            CGLIB$BIND\_CALLBACKS(this);  
            var10000 = this.CGLIB$CALLBACK\_4;  
        }

        ((Advised)var10000.loadObject()).setTargetSource(var1);  
    } catch (Error | RuntimeException var2) {  
        throw var2;  
    } catch (Throwable var3) {  
        throw new UndeclaredThrowableException(var3);  
    }  
}

public final Advisor\[\] getAdvisors() {  
    try {  
        Dispatcher var10000 = this.CGLIB$CALLBACK\_4;  
        if (this.CGLIB$CALLBACK\_4 == null) {  
            CGLIB$BIND\_CALLBACKS(this);  
            var10000 = this.CGLIB$CALLBACK\_4;  
        }

        return ((Advised)var10000.loadObject()).getAdvisors();  
    } catch (Error | RuntimeException var1) {  
        throw var1;  
    } catch (Throwable var2) {  
        throw new UndeclaredThrowableException(var2);  
    }  
}

public final boolean isProxyTargetClass() {  
    try {  
        Dispatcher var10000 = this.CGLIB$CALLBACK\_4;  
        if (this.CGLIB$CALLBACK\_4 == null) {  
            CGLIB$BIND\_CALLBACKS(this);  
            var10000 = this.CGLIB$CALLBACK\_4;  
        }

        return ((Advised)var10000.loadObject()).isProxyTargetClass();  
    } catch (Error | RuntimeException var1) {  
        throw var1;  
    } catch (Throwable var2) {  
        throw new UndeclaredThrowableException(var2);  
    }  
}

public final void addAdvice(Advice var1) throws AopConfigException {  
    try {  
        Dispatcher var10000 = this.CGLIB$CALLBACK\_4;  
        if (this.CGLIB$CALLBACK\_4 == null) {  
            CGLIB$BIND\_CALLBACKS(this);  
            var10000 = this.CGLIB$CALLBACK\_4;  
        }

        ((Advised)var10000.loadObject()).addAdvice(var1);  
    } catch (Error | AopConfigException | RuntimeException var2) {  
        throw var2;  
    } catch (Throwable var3) {  
        throw new UndeclaredThrowableException(var3);  
    }  
}

public final void addAdvice(int var1, Advice var2) throws AopConfigException {  
    try {  
        Dispatcher var10000 = this.CGLIB$CALLBACK\_4;  
        if (this.CGLIB$CALLBACK\_4 == null) {  
            CGLIB$BIND\_CALLBACKS(this);  
            var10000 = this.CGLIB$CALLBACK\_4;  
        }

        ((Advised)var10000.loadObject()).addAdvice(var1, var2);  
    } catch (Error | AopConfigException | RuntimeException var3) {  
        throw var3;  
    } catch (Throwable var4) {  
        throw new UndeclaredThrowableException(var4);  
    }  
}

public final boolean replaceAdvisor(Advisor var1, Advisor var2) throws AopConfigException {  
    try {  
        Dispatcher var10000 = this.CGLIB$CALLBACK\_4;  
        if (this.CGLIB$CALLBACK\_4 == null) {  
            CGLIB$BIND\_CALLBACKS(this);  
            var10000 = this.CGLIB$CALLBACK\_4;  
        }

        return ((Advised)var10000.loadObject()).replaceAdvisor(var1, var2);  
    } catch (Error | AopConfigException | RuntimeException var3) {  
        throw var3;  
    } catch (Throwable var4) {  
        throw new UndeclaredThrowableException(var4);  
    }  
}

public final void addAdvisor(int var1, Advisor var2) throws AopConfigException {  
    try {  
        Dispatcher var10000 = this.CGLIB$CALLBACK\_4;  
        if (this.CGLIB$CALLBACK\_4 == null) {  
            CGLIB$BIND\_CALLBACKS(this);  
            var10000 = this.CGLIB$CALLBACK\_4;  
        }

        ((Advised)var10000.loadObject()).addAdvisor(var1, var2);  
    } catch (Error | AopConfigException | RuntimeException var3) {  
        throw var3;  
    } catch (Throwable var4) {  
        throw new UndeclaredThrowableException(var4);  
    }  
}

public final void addAdvisor(Advisor var1) throws AopConfigException {  
    try {  
        Dispatcher var10000 = this.CGLIB$CALLBACK\_4;  
        if (this.CGLIB$CALLBACK\_4 == null) {  
            CGLIB$BIND\_CALLBACKS(this);  
            var10000 = this.CGLIB$CALLBACK\_4;  
        }

        ((Advised)var10000.loadObject()).addAdvisor(var1);  
    } catch (Error | AopConfigException | RuntimeException var2) {  
        throw var2;  
    } catch (Throwable var3) {  
        throw new UndeclaredThrowableException(var3);  
    }  
}

public final boolean isPreFiltered() {  
    try {  
        Dispatcher var10000 = this.CGLIB$CALLBACK\_4;  
        if (this.CGLIB$CALLBACK\_4 == null) {  
            CGLIB$BIND\_CALLBACKS(this);  
            var10000 = this.CGLIB$CALLBACK\_4;  
        }

        return ((Advised)var10000.loadObject()).isPreFiltered();  
    } catch (Error | RuntimeException var1) {  
        throw var1;  
    } catch (Throwable var2) {  
        throw new UndeclaredThrowableException(var2);  
    }  
}

public final boolean removeAdvice(Advice var1) {  
    try {  
        Dispatcher var10000 = this.CGLIB$CALLBACK\_4;  
        if (this.CGLIB$CALLBACK\_4 == null) {  
            CGLIB$BIND\_CALLBACKS(this);  
            var10000 = this.CGLIB$CALLBACK\_4;  
        }

        return ((Advised)var10000.loadObject()).removeAdvice(var1);  
    } catch (Error | RuntimeException var2) {  
        throw var2;  
    } catch (Throwable var3) {  
        throw new UndeclaredThrowableException(var3);  
    }  
}

public final void removeAdvisor(int var1) throws AopConfigException {  
    try {  
        Dispatcher var10000 = this.CGLIB$CALLBACK\_4;  
        if (this.CGLIB$CALLBACK\_4 == null) {  
            CGLIB$BIND\_CALLBACKS(this);  
            var10000 = this.CGLIB$CALLBACK\_4;  
        }

        ((Advised)var10000.loadObject()).removeAdvisor(var1);  
    } catch (Error | AopConfigException | RuntimeException var2) {  
        throw var2;  
    } catch (Throwable var3) {  
        throw new UndeclaredThrowableException(var3);  
    }  
}

public final boolean removeAdvisor(Advisor var1) {  
    try {  
        Dispatcher var10000 = this.CGLIB$CALLBACK\_4;  
        if (this.CGLIB$CALLBACK\_4 == null) {  
            CGLIB$BIND\_CALLBACKS(this);  
            var10000 = this.CGLIB$CALLBACK\_4;  
        }

        return ((Advised)var10000.loadObject()).removeAdvisor(var1);  
    } catch (Error | RuntimeException var2) {  
        throw var2;  
    } catch (Throwable var3) {  
        throw new UndeclaredThrowableException(var3);  
    }  
}

public final TargetSource getTargetSource() {  
    try {  
        Dispatcher var10000 = this.CGLIB$CALLBACK\_4;  
        if (this.CGLIB$CALLBACK\_4 == null) {  
            CGLIB$BIND\_CALLBACKS(this);  
            var10000 = this.CGLIB$CALLBACK\_4;  
        }

        return ((Advised)var10000.loadObject()).getTargetSource();  
    } catch (Error | RuntimeException var1) {  
        throw var1;  
    } catch (Throwable var2) {  
        throw new UndeclaredThrowableException(var2);  
    }  
}

public final void setPreFiltered(boolean var1) {  
    try {  
        Dispatcher var10000 = this.CGLIB$CALLBACK\_4;  
        if (this.CGLIB$CALLBACK\_4 == null) {  
            CGLIB$BIND\_CALLBACKS(this);  
            var10000 = this.CGLIB$CALLBACK\_4;  
        }

        ((Advised)var10000.loadObject()).setPreFiltered(var1);  
    } catch (Error | RuntimeException var2) {  
        throw var2;  
    } catch (Throwable var3) {  
        throw new UndeclaredThrowableException(var3);  
    }  
}

public final boolean isExposeProxy() {  
    try {  
        Dispatcher var10000 = this.CGLIB$CALLBACK\_4;  
        if (this.CGLIB$CALLBACK\_4 == null) {  
            CGLIB$BIND\_CALLBACKS(this);  
            var10000 = this.CGLIB$CALLBACK\_4;  
        }

        return ((Advised)var10000.loadObject()).isExposeProxy();  
    } catch (Error | RuntimeException var1) {  
        throw var1;  
    } catch (Throwable var2) {  
        throw new UndeclaredThrowableException(var2);  
    }  
}

public final void setExposeProxy(boolean var1) {  
    try {  
        Dispatcher var10000 = this.CGLIB$CALLBACK\_4;  
        if (this.CGLIB$CALLBACK\_4 == null) {  
            CGLIB$BIND\_CALLBACKS(this);  
            var10000 = this.CGLIB$CALLBACK\_4;  
        }

        ((Advised)var10000.loadObject()).setExposeProxy(var1);  
    } catch (Error | RuntimeException var2) {  
        throw var2;  
    } catch (Throwable var3) {  
        throw new UndeclaredThrowableException(var3);  
    }  
}

public final Class\[\] getProxiedInterfaces() {  
    try {  
        Dispatcher var10000 = this.CGLIB$CALLBACK\_4;  
        if (this.CGLIB$CALLBACK\_4 == null) {  
            CGLIB$BIND\_CALLBACKS(this);  
            var10000 = this.CGLIB$CALLBACK\_4;  
        }

        return ((Advised)var10000.loadObject()).getProxiedInterfaces();  
    } catch (Error | RuntimeException var1) {  
        throw var1;  
    } catch (Throwable var2) {  
        throw new UndeclaredThrowableException(var2);  
    }  
}

public final boolean isInterfaceProxied(Class var1) {  
    try {  
        Dispatcher var10000 = this.CGLIB$CALLBACK\_4;  
        if (this.CGLIB$CALLBACK\_4 == null) {  
            CGLIB$BIND\_CALLBACKS(this);  
            var10000 = this.CGLIB$CALLBACK\_4;  
        }

        return ((Advised)var10000.loadObject()).isInterfaceProxied(var1);  
    } catch (Error | RuntimeException var2) {  
        throw var2;  
    } catch (Throwable var3) {  
        throw new UndeclaredThrowableException(var3);  
    }  
}

public final String toProxyConfigString() {  
    try {  
        Dispatcher var10000 = this.CGLIB$CALLBACK\_4;  
        if (this.CGLIB$CALLBACK\_4 == null) {  
            CGLIB$BIND\_CALLBACKS(this);  
            var10000 = this.CGLIB$CALLBACK\_4;  
        }

        return ((Advised)var10000.loadObject()).toProxyConfigString();  
    } catch (Error | RuntimeException var1) {  
        throw var1;  
    } catch (Throwable var2) {  
        throw new UndeclaredThrowableException(var2);  
    }  
}

public final Class getTargetClass() {  
    try {  
        Dispatcher var10000 = this.CGLIB$CALLBACK\_4;  
        if (this.CGLIB$CALLBACK\_4 == null) {  
            CGLIB$BIND\_CALLBACKS(this);  
            var10000 = this.CGLIB$CALLBACK\_4;  
        }

        return ((TargetClassAware)var10000.loadObject()).getTargetClass();  
    } catch (Error | RuntimeException var1) {  
        throw var1;  
    } catch (Throwable var2) {  
        throw new UndeclaredThrowableException(var2);  
    }  
}

public OrderDao$$EnhancerBySpringCGLIB$$ee33136() {  
    try {  
        super();  
        CGLIB$BIND\_CALLBACKS(this);  
    } catch (Error | RuntimeException var1) {  
        throw var1;  
    } catch (Throwable var2) {  
        throw new UndeclaredThrowableException(var2);  
    }  
}

public static void CGLIB$SET\_THREAD\_CALLBACKS(Callback\[\] var0) {  
    CGLIB$THREAD\_CALLBACKS.set(var0);  
}

public static void CGLIB$SET\_STATIC\_CALLBACKS(Callback\[\] var0) {  
    CGLIB$STATIC\_CALLBACKS = var0;  
}

private static final void CGLIB$BIND\_CALLBACKS(Object var0) {  
    OrderDao$$EnhancerBySpringCGLIB$$ee33136 var1 = (OrderDao$$EnhancerBySpringCGLIB$$ee33136)var0;  
    if (!var1.CGLIB$BOUND) {  
        var1.CGLIB$BOUND = true;  
        Object var10000 = CGLIB$THREAD\_CALLBACKS.get();  
        if (var10000 == null) {  
            var10000 = CGLIB$STATIC\_CALLBACKS;  
            if (CGLIB$STATIC\_CALLBACKS == null) {  
                return;  
            }  
        }

        Callback\[\] var10001 = (Callback\[\])var10000;  
        var1.CGLIB$CALLBACK\_6 = (MethodInterceptor)((Callback\[\])var10000)\[6\];  
        var1.CGLIB$CALLBACK\_5 = (MethodInterceptor)var10001\[5\];  
        var1.CGLIB$CALLBACK\_4 = (Dispatcher)var10001\[4\];  
        var1.CGLIB$CALLBACK\_3 = (Dispatcher)var10001\[3\];  
        var1.CGLIB$CALLBACK\_2 = (NoOp)var10001\[2\];  
        var1.CGLIB$CALLBACK\_1 = (MethodInterceptor)var10001\[1\];  
        var1.CGLIB$CALLBACK\_0 = (MethodInterceptor)var10001\[0\];  
    }

}

public Object newInstance(Callback\[\] var1) {  
    try {  
        CGLIB$SET\_THREAD\_CALLBACKS(var1);  
        OrderDao$$EnhancerBySpringCGLIB$$ee33136 var10000 = new OrderDao$$EnhancerBySpringCGLIB$$ee33136();  
        CGLIB$SET\_THREAD\_CALLBACKS((Callback\[\])null);  
        return var10000;  
    } catch (Error | RuntimeException var2) {  
        throw var2;  
    } catch (Throwable var3) {  
        throw new UndeclaredThrowableException(var3);  
    }  
}

public Object newInstance(Callback var1) {  
    try {  
        throw new IllegalStateException("More than one callback object required");  
    } catch (Error | RuntimeException var2) {  
        throw var2;  
    } catch (Throwable var3) {  
        throw new UndeclaredThrowableException(var3);  
    }  
}

public Object newInstance(Class\[\] var1, Object\[\] var2, Callback\[\] var3) {  
    try {  
        CGLIB$SET\_THREAD\_CALLBACKS(var3);  
        OrderDao$$EnhancerBySpringCGLIB$$ee33136 var10000 = new OrderDao$$EnhancerBySpringCGLIB$$ee33136;  
        switch(var1.length) {  
        case 0:  
            var10000.<init>();  
            CGLIB$SET\_THREAD\_CALLBACKS((Callback\[\])null);  
            return var10000;  
        default:  
            throw new IllegalArgumentException("Constructor not found");  
        }  
    } catch (Error | RuntimeException var4) {  
        throw var4;  
    } catch (Throwable var5) {  
        throw new UndeclaredThrowableException(var5);  
    }  
}

public Callback getCallback(int var1) {  
    try {  
        CGLIB$BIND\_CALLBACKS(this);  
        Object var10000;  
        switch(var1) {  
        case 0:  
            var10000 = this.CGLIB$CALLBACK\_0;  
            break;  
        case 1:  
            var10000 = this.CGLIB$CALLBACK\_1;  
            break;  
        case 2:  
            var10000 = this.CGLIB$CALLBACK\_2;  
            break;  
        case 3:  
            var10000 = this.CGLIB$CALLBACK\_3;  
            break;  
        case 4:  
            var10000 = this.CGLIB$CALLBACK\_4;  
            break;  
        case 5:  
            var10000 = this.CGLIB$CALLBACK\_5;  
            break;  
        case 6:  
            var10000 = this.CGLIB$CALLBACK\_6;  
            break;  
        default:  
            var10000 = null;  
        }

        return (Callback)var10000;  
    } catch (Error | RuntimeException var2) {  
        throw var2;  
    } catch (Throwable var3) {  
        throw new UndeclaredThrowableException(var3);  
    }  
}

public void setCallback(int var1, Callback var2) {  
    try {  
        switch(var1) {  
        case 0:  
            this.CGLIB$CALLBACK\_0 = (MethodInterceptor)var2;  
            break;  
        case 1:  
            this.CGLIB$CALLBACK\_1 = (MethodInterceptor)var2;  
            break;  
        case 2:  
            this.CGLIB$CALLBACK\_2 = (NoOp)var2;  
            break;  
        case 3:  
            this.CGLIB$CALLBACK\_3 = (Dispatcher)var2;  
            break;  
        case 4:  
            this.CGLIB$CALLBACK\_4 = (Dispatcher)var2;  
            break;  
        case 5:  
            this.CGLIB$CALLBACK\_5 = (MethodInterceptor)var2;  
            break;  
        case 6:  
            this.CGLIB$CALLBACK\_6 = (MethodInterceptor)var2;  
        }

    } catch (Error | RuntimeException var3) {  
        throw var3;  
    } catch (Throwable var4) {  
        throw new UndeclaredThrowableException(var4);  
    }  
}

public Callback\[\] getCallbacks() {  
    try {  
        CGLIB$BIND\_CALLBACKS(this);  
        return new Callback\[\]{this.CGLIB$CALLBACK\_0, this.CGLIB$CALLBACK\_1, this.CGLIB$CALLBACK\_2, this.CGLIB$CALLBACK\_3, this.CGLIB$CALLBACK\_4, this.CGLIB$CALLBACK\_5, this.CGLIB$CALLBACK\_6};  
    } catch (Error | RuntimeException var1) {  
        throw var1;  
    } catch (Throwable var2) {  
        throw new UndeclaredThrowableException(var2);  
    }  
}

public void setCallbacks(Callback\[\] var1) {  
    try {  
        this.CGLIB$CALLBACK\_0 = (MethodInterceptor)var1\[0\];  
        this.CGLIB$CALLBACK\_1 = (MethodInterceptor)var1\[1\];  
        this.CGLIB$CALLBACK\_2 = (NoOp)var1\[2\];  
        this.CGLIB$CALLBACK\_3 = (Dispatcher)var1\[3\];  
        this.CGLIB$CALLBACK\_4 = (Dispatcher)var1\[4\];  
        this.CGLIB$CALLBACK\_5 = (MethodInterceptor)var1\[5\];  
        this.CGLIB$CALLBACK\_6 = (MethodInterceptor)var1\[6\];  
    } catch (Error | RuntimeException var2) {  
        throw var2;  
    } catch (Throwable var3) {  
        throw new UndeclaredThrowableException(var3);  
    }  
}

static {  
    CGLIB$STATICHOOK6();  
    CGLIB$STATICHOOK5();  
}

static void CGLIB$STATICHOOK6() {  
    try {  
        ;  
    } catch (Error | RuntimeException var0) {  
        throw var0;  
    } catch (Throwable var1) {  
        throw new UndeclaredThrowableException(var1);  
    }  
}  

}

　　从上面可以看到代理类里面有query方法，代理类继承了OrderDao和实现了Dao接口：

public class OrderDao$$EnhancerBySpringCGLIB$$ee33136 extends OrderDao implements Dao, SpringProxy, Advised, Factory {
……………………….

final void CGLIB$query$4() {  
    super.query();  
}

public final void query() {  
    try {  
        MethodInterceptor var10000 = this.CGLIB$CALLBACK\_0;  
        if (this.CGLIB$CALLBACK\_0 == null) {  
            CGLIB$BIND\_CALLBACKS(this);  
            var10000 = this.CGLIB$CALLBACK\_0;  
        }

        if (var10000 != null) {  
            var10000.intercept(this, CGLIB$query$4$Method, CGLIB$emptyArgs, CGLIB$query$4$Proxy);  
        } else {  
            super.query();  
        }  
    } catch (Error | RuntimeException var1) {  
        throw var1;  
    } catch (Throwable var2) {  
        throw new UndeclaredThrowableException(var2);  
    }  
}

............................  

}

　　从前文Spring笔记(3) - SpringAOP基础详解和源码探究可以得知在 AbstractAutoProxyCreator#wrapIfNecessary()中会对bean进行包装增强（代理），下面打下断点debug跟踪下流程：

　　当执行到wrapIfNecessary方法下面的代码时，bean还是原对象（未被代理）：

Object[] specificInterceptors = getAdvicesAndAdvisorsForBean(bean.getClass(), beanName, null);

　　当上面的代码执行完后，可以看到specificInterceptors数组包含了advice(通知)、introducedInterface(引用接口）、typePatternClassFilter(class过滤规则，重点)，其中advice包含了defaultImplType(默认实现类型，上面代码中定义的），可以看到是IndexDao，interfaceType(接口类型)可以看到是Dao，以上信息是通过解析@DeclareParents注解而来的：

　　下面typePatternClassFilter里面的详情，可以看到，上面的信息又包含在typePatternClassFilter里面，同时里面包含了过滤规则：

　　最后通过DefaultAopProxyFactory#createAopProxy方法创建的对象如下图：

　　当执行query方法时，CglibAopProxy.DynamicAdvisedInterceptor#intercept方法进行拦截时，会执行父类的方法ReflectiveMethodInvocation#ReflectiveMethodInvocation：

　　执行完会跳转到ReflectiveMethodInvocation#proceed执行方法的执行：

public Object proceed() throws Throwable {  
    // We start with an index of -1 and increment early.  
    if (this.currentInterceptorIndex == this.interceptorsAndDynamicMethodMatchers.size() - 1) {  
        return invokeJoinpoint();  
    }  
    //获取通知  
    Object interceptorOrInterceptionAdvice =  
            this.interceptorsAndDynamicMethodMatchers.get(++this.currentInterceptorIndex);  
    if (interceptorOrInterceptionAdvice instanceof InterceptorAndDynamicMethodMatcher) {  
        // Evaluate dynamic method matcher here: static part will already have  
        // been evaluated and found to match.  
        InterceptorAndDynamicMethodMatcher dm =  
                (InterceptorAndDynamicMethodMatcher) interceptorOrInterceptionAdvice;  
        if (dm.methodMatcher.matches(this.method, this.targetClass, this.arguments)) {  
            return dm.interceptor.invoke(this);  
        }  
        else {  
            // Dynamic matching failed.  
            // Skip this interceptor and invoke the next in the chain.  
            return proceed();  
        }  
    }  
    else {  
        // It's an interceptor, so we just invoke it: The pointcut will have  
        // been evaluated statically before this object was constructed.  
        return ((MethodInterceptor) interceptorOrInterceptionAdvice).invoke(this);//执行方法  
    }  
}    

　　下面执行delegate对象获取到IndexDao，然后AopUtils.invokeJoinpointUsingReflection执行IndexDao的query实现方法：

　　其中getIntroductionDelegateFor方法中的delegate通过反射对默认实现类型进行构造方法实例化后调用实例化的方法：

　　总结：Introductions（引用）通过 @DeclareParents 注解实现，可以给一个空白类进行方法复制，它通过解析@DeclareParents 注解信息，代理时将定义的静态接口变量作为它的父类，并实现它的方法，方法执行时调用的是defaultImpl 指定的类模板的实现方法；