spring之aop方法内部调用问题
来源：互联网 发布：eclipse java 贪吃蛇 编辑：程序博客网 时间：2024/06/01 19:27
现象描述：假设有一个service，其中有A B 两个方法，A B都被aop托管，且A中调用了B方法，这时请求方法A的时候只会触发A的aop逻辑而不会触发B的aop逻辑。
public interface UserService { void test();} public class UserServiceImpl implements UserService { @Override public void test() { System.out.println("UserService 逻辑执行。。。。"); }}jdk动态代理：
/***代理类真正执行的是InvocationHandler的invoke方法*/public class MyInvocationHandler implements InvocationHandler { private Object target; public MyInvocationHandler(Object obj) { this.target = obj; } @Override public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { System.out.println("Befroe invoke ............."); Object r = method.invoke(target, args); System.out.println("After invoke ..............."); return r; }}UserServiceImpl impl = new UserServiceImpl(); UserService service = (UserService) Proxy.newProxyInstance(Thread.currentThread().getContextClassLoader(), impl.getClass().getInterfaces(), new MyInvocationHandler(impl)); service.test();//这里将动态代理生成的类文件写入磁盘，方便反编译 byte[] classFile = ProxyGenerator.generateProxyClass("$Proxy11", UserServiceImpl.class.getInterfaces()); FileOutputStream out = null; try { out = new FileOutputStream("C:\\Users\\nieyanshun\\Desktop\\test\\clazz.class"); out.write(classFile); out.flush(); } catch (Exception e) { e.printStackTrace(); } finally { try { if (null != out) out.close(); } catch (IOException e) { e.printStackTrace(); } } }以上是jdk动态代理的示例代码，我们反编译看下：
import java.lang.reflect.InvocationHandler;import java.lang.reflect.Method;import java.lang.reflect.Proxy;import java.lang.reflect.UndeclaredThrowableException;import org.flying.bird.rpc.proxy.UserService;public final class $Proxy11 extends Proxy implements UserService{ private static Method m1; private static Method m3; private static Method m2; private static Method m0; public $Proxy11(InvocationHandler paramInvocationHandler) { super(paramInvocationHandler); } public final boolean equals(Object paramObject) { try { return ((Boolean)this.h.invoke(this, m1, new Object[] { paramObject })).booleanValue(); } catch (Error|RuntimeException localError) { throw localError; } catch (Throwable localThrowable) { throw new UndeclaredThrowableException(localThrowable); } } public final void test() { try { this.h.invoke(this, m3, null); return; } catch (Error|RuntimeException localError) { throw localError; } catch (Throwable localThrowable) { throw new UndeclaredThrowableException(localThrowable); } } public final String toString() { try { return (String)this.h.invoke(this, m2, null); } catch (Error|RuntimeException localError) { throw localError; } catch (Throwable localThrowable) { throw new UndeclaredThrowableException(localThrowable); } } public final int hashCode() { try { return ((Integer)this.h.invoke(this, m0, null)).intValue(); } catch (Error|RuntimeException localError) { throw localError; } catch (Throwable localThrowable) { throw new UndeclaredThrowableException(localThrowable); } } static { try { m1 = Class.forName("java.lang.Object").getMethod("equals", new Class[] { Class.forName("java.lang.Object") }); m3 = Class.forName("org.flying.bird.rpc.proxy.UserService").getMethod("test", new Class[0]); m2 = Class.forName("java.lang.Object").getMethod("toString", new Class[0]); m0 = Class.forName("java.lang.Object").getMethod("hashCode", new Class[0]); return; } catch (NoSuchMethodException localNoSuchMethodException) { throw new NoSuchMethodError(localNoSuchMethodException.getMessage()); } catch (ClassNotFoundException localClassNotFoundException) { throw new NoClassDefFoundError(localClassNotFoundException.getMessage()); } }}从反编译的结果我们可以知道，jdk动态代理是以反射为基础的，被代理类必须是接口的实现类。jdk首先通过IO流生成相应的class文件，class类实现被代理类接口，继承Proxy父类，，然后在返回对象代理对象的实例。代理对象持有了被代理类的Method对象，通过调用InvocationHandler，this.h.invoke(this, m3, null);执行被代理对象的逻辑。因此，以jdk动态代理为基础的aop实现，A方法调用B方法，只有A方法的aop逻辑会执行是合乎逻辑的，因为我们执行代理对象A方法的时候，其实是执行了原生被代理对象的Method，此Method内部调用了B，因此不会被aop托管。
cglib：
public class CglibProxy implements MethodInterceptor { @Override public Object intercept(Object arg0, Method arg1, Object[] arg2, MethodProxy proxy) throws Throwable { // 添加切面逻辑（advise），此处是在目标类代码执行之前，即为MethodBeforeAdviceInterceptor。 System.out.println("before-------------"); // 执行目标类add方法 proxy.invokeSuper(arg0, arg2); // 添加切面逻辑（advise），此处是在目标类代码执行之后，即为MethodAfterAdviceInterceptor。 System.out.println("after--------------"); return null; }}package org.flying.bird.rpc.proxy.cglib;import org.flying.bird.rpc.proxy.UserServiceImpl;import net.sf.cglib.core.DebuggingClassWriter;import net.sf.cglib.proxy.Enhancer;public class Factory { /** * 获得增强之后的目标类，即添加了切入逻辑advice之后的目标类 * * @param proxy * @return */ public static UserServiceImpl getInstance(CglibProxy proxy) { System.setProperty(DebuggingClassWriter.DEBUG_LOCATION_PROPERTY, "C:\\\\Users\\\\nieyanshun\\\\Desktop\\\\test"); Enhancer enhancer = new Enhancer(); enhancer.setSuperclass(UserServiceImpl.class); // 回调方法的参数为代理类对象CglibProxy，最后增强目标类调用的是代理类对象CglibProxy中的intercept方法 enhancer.setCallback(proxy); UserServiceImpl service = (UserServiceImpl) enhancer.create(); return service; } public static void main(String[] args) { CglibProxy proxy = new CglibProxy(); UserServiceImpl service = Factory.getInstance(proxy); service.test(); }}要想知道cglib做了什么，我们还是直接看反编译结果。
另外这里推荐个反编译工具：procyon-decompiler， java -jar procyon-decompiler-version.jar target.class
// // Decompiled by Procyon v0.5.30// package org.flying.bird.rpc.proxy;import net.sf.cglib.core.Signature;import net.sf.cglib.core.ReflectUtils;import net.sf.cglib.proxy.MethodProxy;import java.lang.reflect.Method;import net.sf.cglib.proxy.MethodInterceptor;import net.sf.cglib.proxy.Callback;import net.sf.cglib.proxy.Factory;public class UserServiceImpl$$EnhancerByCGLIB$$590b218f extends UserServiceImpl implements 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$CALLBACK_0; private static Object CGLIB$CALLBACK_FILTER; private static final Method CGLIB$test$0$Method; private static final MethodProxy CGLIB$test$0$Proxy; private static final Object[] CGLIB$emptyArgs; private static final Method CGLIB$equals$1$Method; private static final MethodProxy CGLIB$equals$1$Proxy; private static final Method CGLIB$toString$2$Method; private static final MethodProxy CGLIB$toString$2$Proxy; private static final Method CGLIB$hashCode$3$Method; private static final MethodProxy CGLIB$hashCode$3$Proxy; private static final Method CGLIB$clone$4$Method; private static final MethodProxy CGLIB$clone$4$Proxy; static void CGLIB$STATICHOOK1() { CGLIB$THREAD_CALLBACKS = new ThreadLocal(); CGLIB$emptyArgs = new Object[0]; final Class<?> forName = Class.forName("org.flying.bird.rpc.proxy.UserServiceImpl$$EnhancerByCGLIB$$590b218f"); final Class<?> forName2; final Method[] methods = ReflectUtils.findMethods(new String[] { "equals", "(Ljava/lang/Object;)Z", "toString", "()Ljava/lang/String;", "hashCode", "()I", "clone", "()Ljava/lang/Object;" }, (forName2 = Class.forName("java.lang.Object")).getDeclaredMethods()); CGLIB$equals$1$Method = methods[0]; CGLIB$equals$1$Proxy = MethodProxy.create((Class)forName2, (Class)forName, "(Ljava/lang/Object;)Z", "equals", "CGLIB$equals$1"); CGLIB$toString$2$Method = methods[1]; CGLIB$toString$2$Proxy = MethodProxy.create((Class)forName2, (Class)forName, "()Ljava/lang/String;", "toString", "CGLIB$toString$2"); CGLIB$hashCode$3$Method = methods[2]; CGLIB$hashCode$3$Proxy = MethodProxy.create((Class)forName2, (Class)forName, "()I", "hashCode", "CGLIB$hashCode$3"); CGLIB$clone$4$Method = methods[3]; CGLIB$clone$4$Proxy = MethodProxy.create((Class)forName2, (Class)forName, "()Ljava/lang/Object;", "clone", "CGLIB$clone$4"); final Class<?> forName3; CGLIB$test$0$Method = ReflectUtils.findMethods(new String[] { "test", "()V" }, (forName3 = Class.forName("org.flying.bird.rpc.proxy.UserServiceImpl")).getDeclaredMethods())[0]; CGLIB$test$0$Proxy = MethodProxy.create((Class)forName3, (Class)forName, "()V", "test", "CGLIB$test$0"); } final void CGLIB$test$0() { super.test(); } public final void test() { MethodInterceptor cglib$CALLBACK_2; MethodInterceptor cglib$CALLBACK_0; if ((cglib$CALLBACK_0 = (cglib$CALLBACK_2 = this.CGLIB$CALLBACK_0)) == null) { CGLIB$BIND_CALLBACKS(this); cglib$CALLBACK_2 = (cglib$CALLBACK_0 = this.CGLIB$CALLBACK_0); } if (cglib$CALLBACK_0 != null) { cglib$CALLBACK_2.intercept((Object)this, UserServiceImpl$$EnhancerByCGLIB$$590b218f.CGLIB$test$0$Method, UserServiceImpl$$EnhancerByCGLIB$$590b218f.CGLIB$emptyArgs, UserServiceImpl$$EnhancerByCGLIB$$590b218f.CGLIB$test$0$Proxy); return; } super.test(); } final boolean CGLIB$equals$1(final Object o) { return super.equals(o); } public final boolean equals(final Object o) { MethodInterceptor cglib$CALLBACK_2; MethodInterceptor cglib$CALLBACK_0; if ((cglib$CALLBACK_0 = (cglib$CALLBACK_2 = this.CGLIB$CALLBACK_0)) == null) { CGLIB$BIND_CALLBACKS(this); cglib$CALLBACK_2 = (cglib$CALLBACK_0 = this.CGLIB$CALLBACK_0); } if (cglib$CALLBACK_0 != null) { final Object intercept = cglib$CALLBACK_2.intercept((Object)this, UserServiceImpl$$EnhancerByCGLIB$$590b218f.CGLIB$equals$1$Method, new Object[] { o }, UserServiceImpl$$EnhancerByCGLIB$$590b218f.CGLIB$equals$1$Proxy); return intercept != null && (boolean)intercept; } return super.equals(o); } final String CGLIB$toString$2() { return super.toString(); } public final String toString() { MethodInterceptor cglib$CALLBACK_2; MethodInterceptor cglib$CALLBACK_0; if ((cglib$CALLBACK_0 = (cglib$CALLBACK_2 = this.CGLIB$CALLBACK_0)) == null) { CGLIB$BIND_CALLBACKS(this); cglib$CALLBACK_2 = (cglib$CALLBACK_0 = this.CGLIB$CALLBACK_0); } if (cglib$CALLBACK_0 != null) { return (String)cglib$CALLBACK_2.intercept((Object)this, UserServiceImpl$$EnhancerByCGLIB$$590b218f.CGLIB$toString$2$Method, UserServiceImpl$$EnhancerByCGLIB$$590b218f.CGLIB$emptyArgs, UserServiceImpl$$EnhancerByCGLIB$$590b218f.CGLIB$toString$2$Proxy); } return super.toString(); } final int CGLIB$hashCode$3() { return super.hashCode(); } public final int hashCode() { MethodInterceptor cglib$CALLBACK_2; MethodInterceptor cglib$CALLBACK_0; if ((cglib$CALLBACK_0 = (cglib$CALLBACK_2 = this.CGLIB$CALLBACK_0)) == null) { CGLIB$BIND_CALLBACKS(this); cglib$CALLBACK_2 = (cglib$CALLBACK_0 = this.CGLIB$CALLBACK_0); } if (cglib$CALLBACK_0 != null) { final Object intercept = cglib$CALLBACK_2.intercept((Object)this, UserServiceImpl$$EnhancerByCGLIB$$590b218f.CGLIB$hashCode$3$Method, UserServiceImpl$$EnhancerByCGLIB$$590b218f.CGLIB$emptyArgs, UserServiceImpl$$EnhancerByCGLIB$$590b218f.CGLIB$hashCode$3$Proxy); return (intercept == null) ? 0 : ((Number)intercept).intValue(); } return super.hashCode(); } final Object CGLIB$clone$4() throws CloneNotSupportedException { return super.clone(); } protected final Object clone() throws CloneNotSupportedException { MethodInterceptor cglib$CALLBACK_2; MethodInterceptor cglib$CALLBACK_0; if ((cglib$CALLBACK_0 = (cglib$CALLBACK_2 = this.CGLIB$CALLBACK_0)) == null) { CGLIB$BIND_CALLBACKS(this); cglib$CALLBACK_2 = (cglib$CALLBACK_0 = this.CGLIB$CALLBACK_0); } if (cglib$CALLBACK_0 != null) { return cglib$CALLBACK_2.intercept((Object)this, UserServiceImpl$$EnhancerByCGLIB$$590b218f.CGLIB$clone$4$Method, UserServiceImpl$$EnhancerByCGLIB$$590b218f.CGLIB$emptyArgs, UserServiceImpl$$EnhancerByCGLIB$$590b218f.CGLIB$clone$4$Proxy); } return super.clone(); } public static MethodProxy CGLIB$findMethodProxy(final Signature signature) { final String string = signature.toString(); switch (string.hashCode()) { case -1422510685: { if (string.equals("test()V")) { return UserServiceImpl$$EnhancerByCGLIB$$590b218f.CGLIB$test$0$Proxy; } break; } case -508378822: { if (string.equals("clone()Ljava/lang/Object;")) { return UserServiceImpl$$EnhancerByCGLIB$$590b218f.CGLIB$clone$4$Proxy; } break; } case 1826985398: { if (string.equals("equals(Ljava/lang/Object;)Z")) { return UserServiceImpl$$EnhancerByCGLIB$$590b218f.CGLIB$equals$1$Proxy; } break; } case 1913648695: { if (string.equals("toString()Ljava/lang/String;")) { return UserServiceImpl$$EnhancerByCGLIB$$590b218f.CGLIB$toString$2$Proxy; } break; } case 1984935277: { if (string.equals("hashCode()I")) { return UserServiceImpl$$EnhancerByCGLIB$$590b218f.CGLIB$hashCode$3$Proxy; } break; } } return null; } public UserServiceImpl$$EnhancerByCGLIB$$590b218f() { CGLIB$BIND_CALLBACKS(this); } public static void CGLIB$SET_THREAD_CALLBACKS(final Callback[] array) { UserServiceImpl$$EnhancerByCGLIB$$590b218f.CGLIB$THREAD_CALLBACKS.set(array); } public static void CGLIB$SET_STATIC_CALLBACKS(final Callback[] cglib$STATIC_CALLBACKS) { CGLIB$STATIC_CALLBACKS = cglib$STATIC_CALLBACKS; } private static final void CGLIB$BIND_CALLBACKS(final Object o) { final UserServiceImpl$$EnhancerByCGLIB$$590b218f userServiceImpl$$EnhancerByCGLIB$$590b218f = (UserServiceImpl$$EnhancerByCGLIB$$590b218f)o; if (!userServiceImpl$$EnhancerByCGLIB$$590b218f.CGLIB$BOUND) { userServiceImpl$$EnhancerByCGLIB$$590b218f.CGLIB$BOUND = true; Object o2; if ((o2 = UserServiceImpl$$EnhancerByCGLIB$$590b218f.CGLIB$THREAD_CALLBACKS.get()) != null || (o2 = UserServiceImpl$$EnhancerByCGLIB$$590b218f.CGLIB$STATIC_CALLBACKS) != null) { userServiceImpl$$EnhancerByCGLIB$$590b218f.CGLIB$CALLBACK_0 = (MethodInterceptor)((Callback[])o2)[0]; } } } public Object newInstance(final Callback[] array) { CGLIB$SET_THREAD_CALLBACKS(array); final UserServiceImpl$$EnhancerByCGLIB$$590b218f userServiceImpl$$EnhancerByCGLIB$$590b218f = new UserServiceImpl$$EnhancerByCGLIB$$590b218f(); CGLIB$SET_THREAD_CALLBACKS(null); return userServiceImpl$$EnhancerByCGLIB$$590b218f; } public Object newInstance(final Callback callback) { CGLIB$SET_THREAD_CALLBACKS(new Callback[] { callback }); final UserServiceImpl$$EnhancerByCGLIB$$590b218f userServiceImpl$$EnhancerByCGLIB$$590b218f = new UserServiceImpl$$EnhancerByCGLIB$$590b218f(); CGLIB$SET_THREAD_CALLBACKS(null); return userServiceImpl$$EnhancerByCGLIB$$590b218f; } public Object newInstance(final Class[] array, final Object[] array2, final Callback[] array3) { CGLIB$SET_THREAD_CALLBACKS(array3); switch (array.length) { case 0: { final UserServiceImpl$$EnhancerByCGLIB$$590b218f userServiceImpl$$EnhancerByCGLIB$$590b218f = new UserServiceImpl$$EnhancerByCGLIB$$590b218f(); CGLIB$SET_THREAD_CALLBACKS(null); return userServiceImpl$$EnhancerByCGLIB$$590b218f; } default: { throw new IllegalArgumentException("Constructor not found"); } } } public Callback getCallback(final int n) { CGLIB$BIND_CALLBACKS(this); Object cglib$CALLBACK_0 = null; switch (n) { case 0: { cglib$CALLBACK_0 = this.CGLIB$CALLBACK_0; break; } default: { cglib$CALLBACK_0 = null; break; } } return (Callback)cglib$CALLBACK_0; } public void setCallback(final int n, final Callback callback) { switch (n) { case 0: { this.CGLIB$CALLBACK_0 = (MethodInterceptor)callback; break; } } } public Callback[] getCallbacks() { CGLIB$BIND_CALLBACKS(this); return new Callback[] { this.CGLIB$CALLBACK_0 }; } public void setCallbacks(final Callback[] array) { this.CGLIB$CALLBACK_0 = (MethodInterceptor)array[0]; } static { CGLIB$STATICHOOK1(); }}这里看下test()方法：
public final void test() { MethodInterceptor cglib$CALLBACK_2; MethodInterceptor cglib$CALLBACK_0; if ((cglib$CALLBACK_0 = (cglib$CALLBACK_2 = this.CGLIB$CALLBACK_0)) == null) { CGLIB$BIND_CALLBACKS(this); cglib$CALLBACK_2 = (cglib$CALLBACK_0 = this.CGLIB$CALLBACK_0); } if (cglib$CALLBACK_0 != null) { cglib$CALLBACK_2.intercept((Object) this, UserServiceImpl$$EnhancerByCGLIB$$590b218f.CGLIB$test$0$Method, UserServiceImpl$$EnhancerByCGLIB$$590b218f.CGLIB$emptyArgs, UserServiceImpl$$EnhancerByCGLIB$$590b218f.CGLIB$test$0$Proxy); return; } super.test(); }其实调用的是MethodInterceptor.intercept方法
方法声明：
public Object intercept(Object obj, java.lang.reflect.Method method, Object[] args, MethodProxy proxy) throws Throwable;传递的参数为：
final Class<?> forName3;Method CGLIB$test$0$Method = ReflectUtils.findMethods(new String[] {"test", "()V"}, (forName3 = Class.forName("org.flying.bird.rpc.proxy.UserServiceImpl")) .getDeclaredMethods())[0];MethodProxy CGLIB$test$0$Proxy = MethodProxy.create((Class) forName3, (Class) forName, "()V", "test", "CGLIB$test$0");这里我们发现，cglib的方式和jdk动态代理一样，执行的最终还是MethodInterceptor的方法：
public class CglibProxy implements MethodInterceptor { @Override public Object intercept(Object arg0, Method arg1, Object[] arg2, MethodProxy proxy) throws Throwable { // 添加切面逻辑（advise），此处是在目标类代码执行之前，即为MethodBeforeAdviceInterceptor。 System.out.println("before-------------"); // 执行目标类add方法 proxy.invokeSuper(arg0, arg2); // 添加切面逻辑（advise），此处是在目标类代码执行之后，即为MethodAfterAdviceInterceptor。 System.out.println("after--------------"); return null; }}这里proxy.invokeSuper(arg0, arg2);的proxy对象为前面生成的MethodProxy，arg0为代理对象。
//这里obj对象为代理对象/** * Invoke the original (super) method on the specified object. * @param obj the enhanced object, must be the object passed as the first * argument to the MethodInterceptor * @param args the arguments passed to the intercepted method; you may substitute a different * argument array as long as the types are compatible * @see MethodInterceptor#intercept * @throws Throwable the bare exceptions thrown by the called method are passed through * without wrapping in an <code>InvocationTargetException</code> */public Object invokeSuper(Object obj, Object[] args) throws Throwable { try { init(); FastClassInfo fci = fastClassInfo; return fci.f2.invoke(fci.i2, obj, args); } catch (InvocationTargetException e) { throw e.getTargetException(); } }这里就不继续跟踪代码了，从注释就可以看到，这个函数执行了被代理类的逻辑。
即：
public void test() { System.out.println("UserService 逻辑执行。。。。"); }Invoke the original (super) method on the specified object.
所以和jdk动态代理一样，cglib实现aop，也会存在B方法被A调用后，只会执行A方法的aop逻辑。
补充一点：从cglib生成的代理类来看public class UserServiceImpl$$EnhancerByCGLIB$$590b218f extends UserServiceImpl implements Factory
是直接继承自被代理对象，所以当父类中方法是final的时候，不能被aop代理。
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