Java設(shè)計(jì)模式——代理模式
代理模式主要分為接口，委托類(lèi)，代理類(lèi)
接口：規(guī)定具體方法
委托類(lèi)：實(shí)現(xiàn)接口蛇券，完成具體的業(yè)務(wù)邏輯
代理類(lèi)：實(shí)現(xiàn)接口，在方法里面調(diào)用委托類(lèi)的方法樊拓，自己不實(shí)現(xiàn)核心業(yè)務(wù)纠亚，在調(diào)用委托類(lèi)的方法前后可以執(zhí)行其他操作，也就是增強(qiáng)筋夏。
代理重要的特征就是： 委托類(lèi)和代理類(lèi)實(shí)現(xiàn)了相同的接口蒂胞，由此對(duì)于調(diào)用者來(lái)說(shuō)委托類(lèi)和代理類(lèi)沒(méi)有什么不同，而且代理類(lèi)的定制性更強(qiáng)条篷，這也是和適配器模式的重要區(qū)別骗随。
靜態(tài)代理
靜態(tài)代理是在編譯時(shí)期就將接口岳瞭，實(shí)現(xiàn)類(lèi)，代理類(lèi)全部編碼蚊锹，也就是在運(yùn)行之前所有的class文件已經(jīng)存在瞳筏。
接口：
public interface Service {
int increaseOne(int num);
String toUpperCase(String str);
}
接口實(shí)現(xiàn)類(lèi)（委托類(lèi)）：
public class ServiceImpl implements Service {
@Override
public int increaseOne(int num) {
return ++num;
}
@Override
public String toUpperCase(String str) {
return str.toUpperCase();
}
}
代理類(lèi)：
public class ServiceProxy implements Service{
private Service service;
public ServiceProxy(Service service) {
this.service = service;
}
@Override
public int increaseOne(int num) {
System.out.println("將要執(zhí)行increaseOne");
int i = service.increaseOne(num);
System.out.println("increaseOne執(zhí)行完畢");
return i;
}
@Override
public String toUpperCase(String str) {
return service.toUpperCase(str);
}
}
測(cè)試類(lèi)：
public class MainTest {
public static void main(String[] args) {
Service service = new ServiceImpl();
ServiceProxy serviceProxy = new ServiceProxy(service);
/**
* 在執(zhí)行真正 increaseOne方法之前或者之后可以執(zhí)行一系列操作
* 這里用sout模擬
*/
System.out.println(serviceProxy.increaseOne(5));
/**
* 調(diào)用真正的 toUpperCase方法
*/
System.out.println(serviceProxy.toUpperCase("hello world"));
}
}
輸出：
將要執(zhí)行increaseOne
increaseOne執(zhí)行完畢
6
HELLO WORLD
JDK動(dòng)態(tài)代理
JDK動(dòng)態(tài)代理簡(jiǎn)化了靜態(tài)代理的繁瑣操作，不需要人工硬編碼代理類(lèi)實(shí)現(xiàn)接口牡昆。
實(shí)現(xiàn)InvocationHandler接口：
public class DynamicProxyHandler implements InvocationHandler {
private Object target;
public DynamicProxyHandler(Object target) {
this.target = target;
}
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
Object result;
if ("increaseOne".equals(method.getName())) {
System.out.println("將要執(zhí)行increaseOne");
result = method.invoke(target, args);
System.out.println("increaseOne執(zhí)行完畢");
} else {
result = method.invoke(target, args);
}
return result;
}
測(cè)試類(lèi)：
public class MainTest {
public static void main(String[] args) {
Service service = new ServiceImpl();
DynamicProxyHandler dynamicProxyHandler = new DynamicProxyHandler(service);
Service serviceProxy = (Service) Proxy.newProxyInstance(
Thread.currentThread().getContextClassLoader(),
service.getClass().getInterfaces(), dynamicProxyHandler);
System.out.println(serviceProxy.increaseOne(5));
System.out.println(serviceProxy.toUpperCase("hello world"));
}
}
輸出：
將要執(zhí)行increaseOne
increaseOne執(zhí)行完畢
6
HELLO WORLD
比較分析
靜態(tài)代理的實(shí)現(xiàn)方式：
代理類(lèi)實(shí)現(xiàn)接口姚炕，實(shí)例化代理類(lèi)，代理類(lèi)的成員變量引用委托類(lèi)對(duì)象丢烘，代理類(lèi)調(diào)用方法柱宦，方法內(nèi)部委托類(lèi)對(duì)象調(diào)用方法。
JDK動(dòng)態(tài)代理的實(shí)現(xiàn)方式：
與靜態(tài)代理的過(guò)程是一樣的播瞳，但是代理類(lèi)編碼是由JVM完成掸刊，我們只需要關(guān)注方法的實(shí)現(xiàn)細(xì)節(jié)。
-
實(shí)現(xiàn)
InvocationHandler接口：
先看看InvocationHandler接口：public interface InvocationHandler { public Object invoke(Object proxy, Method method, Object[] args) throws Throwable; }只有
invoke方法赢乓，三個(gè)參數(shù)：類(lèi)型 參數(shù) 說(shuō)明 Object proxy 自動(dòng)生成的代理對(duì)象忧侧，后面詳細(xì)說(shuō) Method method 調(diào)用的方法 Object[] args 調(diào)用的方法的參數(shù) 實(shí)現(xiàn)：
method.invoke(target, args)使用反射讓委托對(duì)象調(diào)用方法，target就是委托對(duì) 象public class DynamicProxyHandler implements InvocationHandler { private Object target; public DynamicProxyHandler(Object target) { this.target = target; } @Override public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { Object result; result = method.invoke(target, args); return result; } } -
生成代理對(duì)象：通過(guò)
Proxy類(lèi)的靜態(tài)方法newProxyInstancepublic static Object newProxyInstance(ClassLoader loader, Class<?>[] interfaces, InvocationHandler h)newProxyInstance需要三個(gè)參數(shù)：類(lèi)型 參數(shù) 說(shuō)明 ClassLoader loadery 類(lèi)加載器牌芋，使用類(lèi)的或者當(dāng)前線(xiàn)程的都可以 Class<?> interfaces 代理類(lèi)代理的接口蚓炬，相當(dāng)于示例中的 Service接口InvocationHandler h 回調(diào)對(duì)象，代理方法的具體實(shí)現(xiàn)細(xì)節(jié)在這里完成
-
具體過(guò)程：
-
調(diào)用
Proxy.newProxyInstance(ClassLoader, Class<?>[] , InvocationHandler)public static Object newProxyInstance(ClassLoader loader, Class<?>[] interfaces, InvocationHandler h) throws IllegalArgumentException { Objects.requireNonNull(h); final Class<?>[] intfs = interfaces.clone(); final SecurityManager sm = System.getSecurityManager(); if (sm != null) { checkProxyAccess(Reflection.getCallerClass(), loader, intfs); } /* * Look up or generate the designated proxy class. */ Class<?> cl = getProxyClass0(loader, intfs); /* * Invoke its constructor with the designated invocation handler. */ try { if (sm != null) { checkNewProxyPermission(Reflection.getCallerClass(), cl); } final Constructor<?> cons = cl.getConstructor(constructorParams); final InvocationHandler ih = h; if (!Modifier.isPublic(cl.getModifiers())) { AccessController.doPrivileged(new PrivilegedAction<Void>() { public Void run() { cons.setAccessible(true); return null; } }); } return cons.newInstance(new Object[]{h}); } catch (IllegalAccessException|InstantiationException e) { throw new InternalError(e.toString(), e); } catch (InvocationTargetException e) { Throwable t = e.getCause(); if (t instanceof RuntimeException) { throw (RuntimeException) t; } else { throw new InternalError(t.toString(), t); } } catch (NoSuchMethodException e) { throw new InternalError(e.toString(), e); } }重要的有倆步：
-
Class<?> cl = getProxyClass0(loader, intfs)根據(jù)類(lèi)加載器和接口參數(shù)會(huì)生成代理類(lèi)的字節(jié)碼躺屁， -
return cons.newInstance(new Object[]{h})返回生成代理類(lèi)的實(shí)例
來(lái)看看生成的代理類(lèi)（在內(nèi)存中生成.class文件肯夏，需要先輸出保存，再反編譯）：
public final class $ServiceProxy extends Proxy implements Service { private static Method m1; private static Method m2; private static Method m3; private static Method m4; private static Method m0; public $ServiceProxy(InvocationHandler var1) throws { super(var1); } public final boolean equals(Object var1) throws { try { return (Boolean)super.h.invoke(this, m1, new Object[]{var1}); } catch (RuntimeException | Error var3) { throw var3; } catch (Throwable var4) { throw new UndeclaredThrowableException(var4); } } public final String toString() throws { try { return (String)super.h.invoke(this, m2, (Object[])null); } catch (RuntimeException | Error var2) { throw var2; } catch (Throwable var3) { throw new UndeclaredThrowableException(var3); } } public final String toUpperCase(String var1) throws { try { return (String)super.h.invoke(this, m3, new Object[]{var1}); } catch (RuntimeException | Error var3) { throw var3; } catch (Throwable var4) { throw new UndeclaredThrowableException(var4); } } public final int increaseOne(int var1) throws { try { return (Integer)super.h.invoke(this, m4, new Object[]{var1}); } catch (RuntimeException | Error var3) { throw var3; } catch (Throwable var4) { throw new UndeclaredThrowableException(var4); } } public final int hashCode() throws { try { return (Integer)super.h.invoke(this, m0, (Object[])null); } catch (RuntimeException | Error var2) { throw var2; } catch (Throwable var3) { throw new UndeclaredThrowableException(var3); } } static { try { m1 = Class.forName("java.lang.Object").getMethod("equals", Class.forName("java.lang.Object")); m2 = Class.forName("java.lang.Object").getMethod("toString"); m3 = Class.forName("com.Service").getMethod("toUpperCase", Class.forName("java.lang.String")); m4 = Class.forName("com.Service").getMethod("increaseOne", Integer.TYPE); m0 = Class.forName("java.lang.Object").getMethod("hashCode"); } catch (NoSuchMethodException var2) { throw new NoSuchMethodError(var2.getMessage()); } catch (ClassNotFoundException var3) { throw new NoClassDefFoundError(var3.getMessage()); } } }生成的代理類(lèi)實(shí)現(xiàn)l了
Service接口犀暑，這和靜態(tài)代理的代碼類(lèi)似驯击，但是這里還繼承了Proxy類(lèi)，構(gòu)造函數(shù)接受InvocationHandler實(shí)現(xiàn)類(lèi)對(duì)象耐亏，然后調(diào)用Proxy的構(gòu)造函數(shù)徊都，把對(duì)象傳給Proxy的InvocationHandler類(lèi)型成員變量，示例中獲取代理對(duì)象后有個(gè)強(qiáng)制轉(zhuǎn)換類(lèi)型苹熏，之前一直有疑問(wèn)為什么不會(huì)報(bào)錯(cuò)碟贾，直到反編譯代理類(lèi)后看到實(shí)現(xiàn)了Service接口才明白。 -
-
代理類(lèi)對(duì)象調(diào)用接口方法：
繼續(xù)看代理類(lèi)轨域，例如調(diào)用increaseOne方法public final int increaseOne(int var1) throws { try { return (Integer)super.h.invoke(this, m4, new Object[]{var1}); } catch (RuntimeException | Error var3) { throw var3; } catch (Throwable var4) { throw new UndeclaredThrowableException(var4); } }其實(shí)最終調(diào)用的就是我們傳入的
InvocationHandler對(duì)象的invoke方法袱耽，this和new Object[]{var1}，可以理解干发，但是m4什么時(shí)候生成的呢代理類(lèi)有個(gè)
static代碼塊：static { try { m1 = Class.forName("java.lang.Object").getMethod("equals", Class.forName("java.lang.Object")); m2 = Class.forName("java.lang.Object").getMethod("toString"); m3 = Class.forName("com.Service").getMethod("toUpperCase", Class.forName("java.lang.String")); m4 = Class.forName("com.Service").getMethod("increaseOne", Integer.TYPE); m0 = Class.forName("java.lang.Object").getMethod("hashCode"); } catch (NoSuchMethodException var2) { throw new NoSuchMethodError(var2.getMessage()); } catch (ClassNotFoundException var3) { throw new NoClassDefFoundError(var3.getMessage()); } }可以看到
m3和m4是Service接口方法的引用朱巨，其他的三個(gè)方法引用是Object類(lèi)的equals，toString以及hashCode方法枉长，而且這三個(gè)方法里面也調(diào)用了invoke方法冀续，所以不能在invoke方法里面輸出proxy對(duì)象琼讽，相當(dāng)于循環(huán)調(diào)用方法。
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CGLIB動(dòng)態(tài)代理
CGLIB代理的是類(lèi)洪唐，不同于JDK只能代理接口
委托類(lèi)：
public class DelegateClass {
public int increaseOne(int num) {
return ++num;
}
public String toUpperCase(String str) {
return str.toUpperCase();
}
}
代理類(lèi)：
public class CGLIBProxy implements MethodInterceptor {
private Object target;
public CGLIBProxy(Object target) {
this.target = target;
}
@Override
public Object intercept(Object obj, Method method, Object[] args, MethodProxy proxy) throws Throwable {
Object result;
if ("increaseOne".equals(method.getName())) {
System.out.println("將要執(zhí)行increaseOne");
result = method.invoke(target, args);
System.out.println("increaseOne執(zhí)行完畢");
} else {
result = method.invoke(target, args);
}
return result;
}
}
測(cè)試類(lèi)：
public class MainTest {
public static void main(String[] args) {
DelegateClass delegateClass = new DelegateClass();
MethodInterceptor methodInterceptor = new CGLIBProxy(delegateClass);
Enhancer enhancer = new Enhancer();
enhancer.setSuperclass(DelegateClass.class);
enhancer.setCallback(methodInterceptor);
DelegateClass cglibProxy = (DelegateClass) enhancer.create();
System.out.println(cglibProxy.increaseOne(5));
System.out.println(cglibProxy.toUpperCase("hello world"));
}
}
分析：
-
自動(dòng)生成的代理類(lèi)：
public class DelegateClass$$EnhancerByCGLIB$$50d8bc59 extends DelegateClass 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$toUpperCase$0$Method; private static final MethodProxy CGLIB$toUpperCase$0$Proxy; private static final Object[] CGLIB$emptyArgs; private static final Method CGLIB$increaseOne$1$Method; private static final MethodProxy CGLIB$increaseOne$1$Proxy; private static final Method CGLIB$equals$2$Method; private static final MethodProxy CGLIB$equals$2$Proxy; private static final Method CGLIB$toString$3$Method; private static final MethodProxy CGLIB$toString$3$Proxy; private static final Method CGLIB$hashCode$4$Method; private static final MethodProxy CGLIB$hashCode$4$Proxy; private static final Method CGLIB$clone$5$Method; private static final MethodProxy CGLIB$clone$5$Proxy; static void CGLIB$STATICHOOK1() { CGLIB$THREAD_CALLBACKS = new ThreadLocal(); CGLIB$emptyArgs = new Object[0]; Class var0 = Class.forName("com.cglibproxy.DelegateClass$$EnhancerByCGLIB$$50d8bc59"); 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$2$Method = var10000[0]; CGLIB$equals$2$Proxy = MethodProxy.create(var1, var0, "(Ljava/lang/Object;)Z", "equals", "CGLIB$equals$2"); CGLIB$toString$3$Method = var10000[1]; CGLIB$toString$3$Proxy = MethodProxy.create(var1, var0, "()Ljava/lang/String;", "toString", "CGLIB$toString$3"); CGLIB$hashCode$4$Method = var10000[2]; CGLIB$hashCode$4$Proxy = MethodProxy.create(var1, var0, "()I", "hashCode", "CGLIB$hashCode$4"); CGLIB$clone$5$Method = var10000[3]; CGLIB$clone$5$Proxy = MethodProxy.create(var1, var0, "()Ljava/lang/Object;", "clone", "CGLIB$clone$5"); var10000 = ReflectUtils.findMethods(new String[]{"toUpperCase", "(Ljava/lang/String;)Ljava/lang/String;", "increaseOne", "(I)I"}, (var1 = Class.forName("com.cglibproxy.DelegateClass")).getDeclaredMethods()); CGLIB$toUpperCase$0$Method = var10000[0]; CGLIB$toUpperCase$0$Proxy = MethodProxy.create(var1, var0, "(Ljava/lang/String;)Ljava/lang/String;", "toUpperCase", "CGLIB$toUpperCase$0"); CGLIB$increaseOne$1$Method = var10000[1]; CGLIB$increaseOne$1$Proxy = MethodProxy.create(var1, var0, "(I)I", "increaseOne", "CGLIB$increaseOne$1"); } final String CGLIB$toUpperCase$0(String var1) { return super.toUpperCase(var1); } public final String toUpperCase(String var1) { MethodInterceptor var10000 = this.CGLIB$CALLBACK_0; if (this.CGLIB$CALLBACK_0 == null) { CGLIB$BIND_CALLBACKS(this); var10000 = this.CGLIB$CALLBACK_0; } return var10000 != null ? (String)var10000.intercept(this, CGLIB$toUpperCase$0$Method, new Object[]{var1}, CGLIB$toUpperCase$0$Proxy) : super.toUpperCase(var1); } final int CGLIB$increaseOne$1(int var1) { return super.increaseOne(var1); } public final int increaseOne(int var1) { MethodInterceptor var10000 = this.CGLIB$CALLBACK_0; if (this.CGLIB$CALLBACK_0 == null) { CGLIB$BIND_CALLBACKS(this); var10000 = this.CGLIB$CALLBACK_0; } if (var10000 != null) { Object var2 = var10000.intercept(this, CGLIB$increaseOne$1$Method, new Object[]{new Integer(var1)}, CGLIB$increaseOne$1$Proxy); return var2 == null ? 0 : ((Number)var2).intValue(); } else { return super.increaseOne(var1); } } final boolean CGLIB$equals$2(Object var1) { return super.equals(var1); } public final boolean equals(Object var1) { MethodInterceptor var10000 = this.CGLIB$CALLBACK_0; if (this.CGLIB$CALLBACK_0 == null) { CGLIB$BIND_CALLBACKS(this); var10000 = this.CGLIB$CALLBACK_0; } if (var10000 != null) { Object var2 = var10000.intercept(this, CGLIB$equals$2$Method, new Object[]{var1}, CGLIB$equals$2$Proxy); return var2 == null ? false : (Boolean)var2; } else { return super.equals(var1); } } final String CGLIB$toString$3() { return super.toString(); } public final String toString() { MethodInterceptor var10000 = this.CGLIB$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$3$Method, CGLIB$emptyArgs, CGLIB$toString$3$Proxy) : super.toString(); } final int CGLIB$hashCode$4() { return super.hashCode(); } public final int hashCode() { MethodInterceptor var10000 = this.CGLIB$CALLBACK_0; if (this.CGLIB$CALLBACK_0 == null) { CGLIB$BIND_CALLBACKS(this); var10000 = this.CGLIB$CALLBACK_0; } if (var10000 != null) { Object var1 = var10000.intercept(this, CGLIB$hashCode$4$Method, CGLIB$emptyArgs, CGLIB$hashCode$4$Proxy); return var1 == null ? 0 : ((Number)var1).intValue(); } else { return super.hashCode(); } } final Object CGLIB$clone$5() throws CloneNotSupportedException { return super.clone(); } protected final Object clone() throws CloneNotSupportedException { MethodInterceptor var10000 = this.CGLIB$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$5$Method, CGLIB$emptyArgs, CGLIB$clone$5$Proxy) : super.clone(); } public static MethodProxy CGLIB$findMethodProxy(Signature var0) { String var10000 = var0.toString(); switch(var10000.hashCode()) { case -1961280283: if (var10000.equals("increaseOne(I)I")) { return CGLIB$increaseOne$1$Proxy; } break; case -508378822: if (var10000.equals("clone()Ljava/lang/Object;")) { return CGLIB$clone$5$Proxy; } break; case 893465080: if (var10000.equals("toUpperCase(Ljava/lang/String;)Ljava/lang/String;")) { return CGLIB$toUpperCase$0$Proxy; } break; case 1826985398: if (var10000.equals("equals(Ljava/lang/Object;)Z")) { return CGLIB$equals$2$Proxy; } break; case 1913648695: if (var10000.equals("toString()Ljava/lang/String;")) { return CGLIB$toString$3$Proxy; } break; case 1984935277: if (var10000.equals("hashCode()I")) { return CGLIB$hashCode$4$Proxy; } } return null; } public DelegateClass$$EnhancerByCGLIB$$50d8bc59() { CGLIB$BIND_CALLBACKS(this); } public static void CGLIB$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) { DelegateClass$$EnhancerByCGLIB$$50d8bc59 var1 = (DelegateClass$$EnhancerByCGLIB$$50d8bc59)var0; if (!var1.CGLIB$BOUND) { var1.CGLIB$BOUND = true; Object var10000 = CGLIB$THREAD_CALLBACKS.get(); if (var10000 == null) { var10000 = CGLIB$STATIC_CALLBACKS; if (CGLIB$STATIC_CALLBACKS == null) { return; } } var1.CGLIB$CALLBACK_0 = (MethodInterceptor)((Callback[])var10000)[0]; } } public Object newInstance(Callback[] var1) { CGLIB$SET_THREAD_CALLBACKS(var1); DelegateClass$$EnhancerByCGLIB$$50d8bc59 var10000 = new DelegateClass$$EnhancerByCGLIB$$50d8bc59(); CGLIB$SET_THREAD_CALLBACKS((Callback[])null); return var10000; } public Object newInstance(Callback var1) { CGLIB$SET_THREAD_CALLBACKS(new Callback[]{var1}); DelegateClass$$EnhancerByCGLIB$$50d8bc59 var10000 = new DelegateClass$$EnhancerByCGLIB$$50d8bc59(); CGLIB$SET_THREAD_CALLBACKS((Callback[])null); return var10000; } public Object newInstance(Class[] var1, Object[] var2, Callback[] var3) { CGLIB$SET_THREAD_CALLBACKS(var3); DelegateClass$$EnhancerByCGLIB$$50d8bc59 var10000 = new DelegateClass$$EnhancerByCGLIB$$50d8bc59; switch(var1.length) { case 0: var10000.<init>(); CGLIB$SET_THREAD_CALLBACKS((Callback[])null); return var10000; default: throw new IllegalArgumentException("Constructor not found"); } } public Callback getCallback(int var1) { CGLIB$BIND_CALLBACKS(this); MethodInterceptor var10000; switch(var1) { case 0: var10000 = this.CGLIB$CALLBACK_0; break; default: var10000 = null; } return var10000; } public void setCallback(int var1, Callback var2) { switch(var1) { case 0: this.CGLIB$CALLBACK_0 = (MethodInterceptor)var2; default: } } public Callback[] getCallbacks() { CGLIB$BIND_CALLBACKS(this); return new Callback[]{this.CGLIB$CALLBACK_0}; } public void setCallbacks(Callback[] var1) { this.CGLIB$CALLBACK_0 = (MethodInterceptor)var1[0]; } static { CGLIB$STATICHOOK1(); } }類(lèi)繼承了委托類(lèi)
DelegateClass钻蹬，測(cè)試類(lèi)代碼中一行代碼DelegateClass cglibProxy = (DelegateClass) enhancer.create();cglibProxy引用的就是DelegateClass$$EnhancerByCGLIB$$50d8bc59的實(shí)例，屬于子類(lèi)強(qiáng)制轉(zhuǎn)父類(lèi)凭需，除了代理increaseOne和toUpperCase方法外问欠，還有toString，equal粒蜈，hashCode顺献，clone方法也被代理，代理類(lèi)的方法會(huì)判斷是否有回調(diào)對(duì)象枯怖，也就是MethodInterceptor的實(shí)例注整，有的話(huà)調(diào)用回調(diào)對(duì)象的intercept方法，否則使用super.increaseOne(var1)調(diào)用委托類(lèi)的方法度硝，沒(méi)有增強(qiáng)處理肿轨。
