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动态代理

动态代理

作者: nanyang_lf | 来源:发表于2018-03-19 14:45 被阅读0次

    JDK动态代理之后生成的class文件反编译之后内容如下:

    //
    // Source code recreated from a .class file by IntelliJ IDEA
    // (powered by Fernflower decompiler)
    //
    
    package com.sun.proxy;
    
    import cn.fay.pattern.proxy.Hello;
    import java.lang.reflect.InvocationHandler;
    import java.lang.reflect.Method;
    import java.lang.reflect.Proxy;
    import java.lang.reflect.UndeclaredThrowableException;
    
    public final class $Proxy0 extends Proxy implements Hello {
        private static Method m1;
        private static Method m3;
        private static Method m0;
        private static Method m2;
    
        public $Proxy0(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 hello() throws  {
            try {
                return (String)super.h.invoke(this, m3, (Object[])null);
            } catch (RuntimeException | Error var2) {
                throw var2;
            } catch (Throwable var3) {
                throw new UndeclaredThrowableException(var3);
            }
        }
    
        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);
            }
        }
    
        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);
            }
        }
    
        static {
            try {
                m1 = Class.forName("java.lang.Object").getMethod("equals", Class.forName("java.lang.Object"));
                m3 = Class.forName("cn.fay.pattern.proxy.Hello").getMethod("hello");
                m0 = Class.forName("java.lang.Object").getMethod("hashCode");
                m2 = Class.forName("java.lang.Object").getMethod("toString");
            } catch (NoSuchMethodException var2) {
                throw new NoSuchMethodError(var2.getMessage());
            } catch (ClassNotFoundException var3) {
                throw new NoClassDefFoundError(var3.getMessage());
            }
        }
    }
    

    除了自己接口的方法之外还会添加ObjecttoString,hashCode,equals方法。
    生成的class继承了Proxy类,这也是为什么JDK只能代理接口的原因。调用方法时都是利用Proxy类中的InvocationHandler来完成,其中第一个参数是代理类本身,所以在InvocationHandler中调用上面的方法时会出现栈溢出情况。

    //
    // Source code recreated from a .class file by IntelliJ IDEA
    // (powered by Fernflower decompiler)
    //
    
    package cn.fay.pattern.proxy;
    
    import java.lang.reflect.Method;
    import net.sf.cglib.core.ReflectUtils;
    import net.sf.cglib.core.Signature;
    import net.sf.cglib.proxy.Callback;
    import net.sf.cglib.proxy.Factory;
    import net.sf.cglib.proxy.MethodInterceptor;
    import net.sf.cglib.proxy.MethodProxy;
    
    public class HelloImpl$$EnhancerByCGLIB$$a2310cf1 extends HelloImpl implements Factory {
        private boolean CGLIB$BOUND;
        private static final ThreadLocal CGLIB$THREAD_CALLBACKS;
        private static final Callback[] CGLIB$STATIC_CALLBACKS;
        private MethodInterceptor CGLIB$CALLBACK_0;
        private static final Method CGLIB$hello$0$Method;
        private static final MethodProxy CGLIB$hello$0$Proxy;
        private static final Object[] CGLIB$emptyArgs;
        private static final Method CGLIB$finalize$1$Method;
        private static final MethodProxy CGLIB$finalize$1$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("cn.fay.pattern.proxy.HelloImpl$$EnhancerByCGLIB$$a2310cf1");
            Class var1;
            Method[] var10000 = ReflectUtils.findMethods(new String[]{"finalize", "()V", "equals", "(Ljava/lang/Object;)Z", "toString", "()Ljava/lang/String;", "hashCode", "()I", "clone", "()Ljava/lang/Object;"}, (var1 = Class.forName("java.lang.Object")).getDeclaredMethods());
            CGLIB$finalize$1$Method = var10000[0];
            CGLIB$finalize$1$Proxy = MethodProxy.create(var1, var0, "()V", "finalize", "CGLIB$finalize$1");
            CGLIB$equals$2$Method = var10000[1];
            CGLIB$equals$2$Proxy = MethodProxy.create(var1, var0, "(Ljava/lang/Object;)Z", "equals", "CGLIB$equals$2");
            CGLIB$toString$3$Method = var10000[2];
            CGLIB$toString$3$Proxy = MethodProxy.create(var1, var0, "()Ljava/lang/String;", "toString", "CGLIB$toString$3");
            CGLIB$hashCode$4$Method = var10000[3];
            CGLIB$hashCode$4$Proxy = MethodProxy.create(var1, var0, "()I", "hashCode", "CGLIB$hashCode$4");
            CGLIB$clone$5$Method = var10000[4];
            CGLIB$clone$5$Proxy = MethodProxy.create(var1, var0, "()Ljava/lang/Object;", "clone", "CGLIB$clone$5");
            CGLIB$hello$0$Method = ReflectUtils.findMethods(new String[]{"hello", "()Ljava/lang/String;"}, (var1 = Class.forName("cn.fay.pattern.proxy.HelloImpl")).getDeclaredMethods())[0];
            CGLIB$hello$0$Proxy = MethodProxy.create(var1, var0, "()Ljava/lang/String;", "hello", "CGLIB$hello$0");
        }
    
        final String CGLIB$hello$0() {
            return super.hello();
        }
    
        public final String hello() {
            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$hello$0$Method, CGLIB$emptyArgs, CGLIB$hello$0$Proxy) : super.hello();
        }
    
        final void CGLIB$finalize$1() throws Throwable {
            super.finalize();
        }
    
        protected final void finalize() throws Throwable {
            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$finalize$1$Method, CGLIB$emptyArgs, CGLIB$finalize$1$Proxy);
            } else {
                super.finalize();
            }
        }
    
        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$findMethodProxy(Signature var0) {
            String var10000 = var0.toString();
            switch(var10000.hashCode()) {
            case -1574182249:
                if (var10000.equals("finalize()V")) {
                    return CGLIB$finalize$1$Proxy;
                }
                break;
            case -508378822:
                if (var10000.equals("clone()Ljava/lang/Object;")) {
                    return CGLIB$clone$5$Proxy;
                }
                break;
            case 397774237:
                if (var10000.equals("hello()Ljava/lang/String;")) {
                    return CGLIB$hello$0$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 HelloImpl$$EnhancerByCGLIB$$a2310cf1() {
            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) {
            HelloImpl$$EnhancerByCGLIB$$a2310cf1 var1 = (HelloImpl$$EnhancerByCGLIB$$a2310cf1)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);
            HelloImpl$$EnhancerByCGLIB$$a2310cf1 var10000 = new HelloImpl$$EnhancerByCGLIB$$a2310cf1();
            CGLIB$SET_THREAD_CALLBACKS((Callback[])null);
            return var10000;
        }
    
        public Object newInstance(Callback var1) {
            CGLIB$SET_THREAD_CALLBACKS(new Callback[]{var1});
            HelloImpl$$EnhancerByCGLIB$$a2310cf1 var10000 = new HelloImpl$$EnhancerByCGLIB$$a2310cf1();
            CGLIB$SET_THREAD_CALLBACKS((Callback[])null);
            return var10000;
        }
    
        public Object newInstance(Class[] var1, Object[] var2, Callback[] var3) {
            CGLIB$SET_THREAD_CALLBACKS(var3);
            HelloImpl$$EnhancerByCGLIB$$a2310cf1 var10000 = new HelloImpl$$EnhancerByCGLIB$$a2310cf1;
            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();
        }
    }
    

    上面为通过cglib代理产生的class反编译之后的内容。

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