其实我们如果看到了cglib所生成的代理类之后，其实就不难猜测，cglib是如何去生成代理类了，我们看一个完整的代理类：

    1. //
    2. // Source code recreated from a .class file by IntelliJ IDEA
    3. // (powered by FernFlower decompiler)
    4. //
    6. package com.zhouyu;
    8. import java.lang.reflect.Method;
    9. import net.sf.cglib.core.ReflectUtils;
    10. import net.sf.cglib.core.Signature;
    11. import net.sf.cglib.proxy.Callback;
    12. import net.sf.cglib.proxy.Factory;
    13. import net.sf.cglib.proxy.MethodInterceptor;
    14. import net.sf.cglib.proxy.MethodProxy;
    16. public class UserService$$EnhancerByCGLIB$$4d890297 extends UserService implements Factory {
    17.     private boolean CGLIB$BOUND;
    18.     public static Object CGLIB$FACTORY_DATA;
    19.     private static final ThreadLocal CGLIB$THREAD_CALLBACKS;
    20.     private static final Callback[] CGLIB$STATIC_CALLBACKS;
    21.     private MethodInterceptor CGLIB$CALLBACK_0;
    22.     private static Object CGLIB$CALLBACK_FILTER;
    23.     private static final Method CGLIB$test$0$Method;
    24.     private static final MethodProxy CGLIB$test$0$Proxy;
    25.     private static final Object[] CGLIB$emptyArgs;
    26.     private static final Method CGLIB$equals$1$Method;
    27.     private static final MethodProxy CGLIB$equals$1$Proxy;
    28.     private static final Method CGLIB$toString$2$Method;
    29.     private static final MethodProxy CGLIB$toString$2$Proxy;
    30.     private static final Method CGLIB$hashCode$3$Method;
    31.     private static final MethodProxy CGLIB$hashCode$3$Proxy;
    32.     private static final Method CGLIB$clone$4$Method;
    33.     private static final MethodProxy CGLIB$clone$4$Proxy;
    35.     static void CGLIB$STATICHOOK1() {
    36.         CGLIB$THREAD_CALLBACKS = new ThreadLocal();
    37.         CGLIB$emptyArgs = new Object[0];
    38.         Class var0 = Class.forName("com.zhouyu.UserService$$EnhancerByCGLIB$$4d890297");
    39.         Class var1;
    40.         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());
    41.         CGLIB$equals$1$Method = var10000[0];
    42.         CGLIB$equals$1$Proxy = MethodProxy.create(var1, var0, "(Ljava/lang/Object;)Z", "equals", "CGLIB$equals$1");
    43.         CGLIB$toString$2$Method = var10000[1];
    44.         CGLIB$toString$2$Proxy = MethodProxy.create(var1, var0, "()Ljava/lang/String;", "toString", "CGLIB$toString$2");
    45.         CGLIB$hashCode$3$Method = var10000[2];
    46.         CGLIB$hashCode$3$Proxy = MethodProxy.create(var1, var0, "()I", "hashCode", "CGLIB$hashCode$3");
    47.         CGLIB$clone$4$Method = var10000[3];
    48.         CGLIB$clone$4$Proxy = MethodProxy.create(var1, var0, "()Ljava/lang/Object;", "clone", "CGLIB$clone$4");
    49.         CGLIB$test$0$Method = ReflectUtils.findMethods(new String[]{"test", "()V"}, (var1 = Class.forName("com.zhouyu.UserService")).getDeclaredMethods())[0];
    50.         CGLIB$test$0$Proxy = MethodProxy.create(var1, var0, "()V", "test", "CGLIB$test$0");
    51.     }
    53.     final void CGLIB$test$0() {
    54.         super.test();
    55.     }
    57.     public final void test() {
    58.         MethodInterceptor var10000 = this.CGLIB$CALLBACK_0;
    59.         if (var10000 == null) {
    60.             CGLIB$BIND_CALLBACKS(this);
    61.             var10000 = this.CGLIB$CALLBACK_0;
    62.         }
    64.         if (var10000 != null) {
    65.             var10000.intercept(this, CGLIB$test$0$Method, CGLIB$emptyArgs, CGLIB$test$0$Proxy);
    66.         } else {
    67.             super.test();
    68.         }
    69.     }
    71.     final boolean CGLIB$equals$1(Object var1) {
    72.         return super.equals(var1);
    73.     }
    75.     public final boolean equals(Object var1) {
    76.         MethodInterceptor var10000 = this.CGLIB$CALLBACK_0;
    77.         if (var10000 == null) {
    78.             CGLIB$BIND_CALLBACKS(this);
    79.             var10000 = this.CGLIB$CALLBACK_0;
    80.         }
    82.         if (var10000 != null) {
    83.             Object var2 = var10000.intercept(this, CGLIB$equals$1$Method, new Object[]{var1}, CGLIB$equals$1$Proxy);
    84.             return var2 == null ? false : (Boolean)var2;
    85.         } else {
    86.             return super.equals(var1);
    87.         }
    88.     }
    90.     final String CGLIB$toString$2() {
    91.         return super.toString();
    92.     }
    94.     public final String toString() {
    95.         MethodInterceptor var10000 = this.CGLIB$CALLBACK_0;
    96.         if (var10000 == null) {
    97.             CGLIB$BIND_CALLBACKS(this);
    98.             var10000 = this.CGLIB$CALLBACK_0;
    99.         }
    101.         return var10000 != null ? (String)var10000.intercept(this, CGLIB$toString$2$Method, CGLIB$emptyArgs, CGLIB$toString$2$Proxy) : super.toString();
    102.     }
    104.     final int CGLIB$hashCode$3() {
    105.         return super.hashCode();
    106.     }
    108.     public final int hashCode() {
    109.         MethodInterceptor var10000 = this.CGLIB$CALLBACK_0;
    110.         if (var10000 == null) {
    111.             CGLIB$BIND_CALLBACKS(this);
    112.             var10000 = this.CGLIB$CALLBACK_0;
    113.         }
    115.         if (var10000 != null) {
    116.             Object var1 = var10000.intercept(this, CGLIB$hashCode$3$Method, CGLIB$emptyArgs, CGLIB$hashCode$3$Proxy);
    117.             return var1 == null ? 0 : ((Number)var1).intValue();
    118.         } else {
    119.             return super.hashCode();
    120.         }
    121.     }
    123.     final Object CGLIB$clone$4() throws CloneNotSupportedException {
    124.         return super.clone();
    125.     }
    127.     protected final Object clone() throws CloneNotSupportedException {
    128.         MethodInterceptor var10000 = this.CGLIB$CALLBACK_0;
    129.         if (var10000 == null) {
    130.             CGLIB$BIND_CALLBACKS(this);
    131.             var10000 = this.CGLIB$CALLBACK_0;
    132.         }
    134.         return var10000 != null ? var10000.intercept(this, CGLIB$clone$4$Method, CGLIB$emptyArgs, CGLIB$clone$4$Proxy) : super.clone();
    135.     }
    137.     public static MethodProxy CGLIB$findMethodProxy(Signature var0) {
    138.         String var10000 = var0.toString();
    139.         switch(var10000.hashCode()) {
    140.         case -1422510685:
    141.             if (var10000.equals("test()V")) {
    142.                 return CGLIB$test$0$Proxy;
    143.             }
    144.             break;
    145.         case -508378822:
    146.             if (var10000.equals("clone()Ljava/lang/Object;")) {
    147.                 return CGLIB$clone$4$Proxy;
    148.             }
    149.             break;
    150.         case 1826985398:
    151.             if (var10000.equals("equals(Ljava/lang/Object;)Z")) {
    152.                 return CGLIB$equals$1$Proxy;
    153.             }
    154.             break;
    155.         case 1913648695:
    156.             if (var10000.equals("toString()Ljava/lang/String;")) {
    157.                 return CGLIB$toString$2$Proxy;
    158.             }
    159.             break;
    160.         case 1984935277:
    161.             if (var10000.equals("hashCode()I")) {
    162.                 return CGLIB$hashCode$3$Proxy;
    163.             }
    164.         }
    166.         return null;
    167.     }
    169.     public UserService$$EnhancerByCGLIB$$4d890297() {
    170.         CGLIB$BIND_CALLBACKS(this);
    171.     }
    173.     public static void CGLIB$SET_THREAD_CALLBACKS(Callback[] var0) {
    174.         CGLIB$THREAD_CALLBACKS.set(var0);
    175.     }
    177.     public static void CGLIB$SET_STATIC_CALLBACKS(Callback[] var0) {
    178.         CGLIB$STATIC_CALLBACKS = var0;
    179.     }
    181.     private static final void CGLIB$BIND_CALLBACKS(Object var0) {
    182.         UserService$$EnhancerByCGLIB$$4d890297 var1 = (UserService$$EnhancerByCGLIB$$4d890297)var0;
    183.         if (!var1.CGLIB$BOUND) {
    184.             var1.CGLIB$BOUND = true;
    185.             Object var10000 = CGLIB$THREAD_CALLBACKS.get();
    186.             if (var10000 == null) {
    187.                 var10000 = CGLIB$STATIC_CALLBACKS;
    188.                 if (var10000 == null) {
    189.                     return;
    190.                 }
    191.             }
    193.             var1.CGLIB$CALLBACK_0 = (MethodInterceptor)((Callback[])var10000)[0];
    194.         }
    196.     }
    198.     public Object newInstance(Callback[] var1) {
    199.         CGLIB$SET_THREAD_CALLBACKS(var1);
    200.         UserService$$EnhancerByCGLIB$$4d890297 var10000 = new UserService$$EnhancerByCGLIB$$4d890297();
    201.         CGLIB$SET_THREAD_CALLBACKS((Callback[])null);
    202.         return var10000;
    203.     }
    205.     public Object newInstance(Callback var1) {
    206.         CGLIB$SET_THREAD_CALLBACKS(new Callback[]{var1});
    207.         UserService$$EnhancerByCGLIB$$4d890297 var10000 = new UserService$$EnhancerByCGLIB$$4d890297();
    208.         CGLIB$SET_THREAD_CALLBACKS((Callback[])null);
    209.         return var10000;
    210.     }
    212.     public Object newInstance(Class[] var1, Object[] var2, Callback[] var3) {
    213.         CGLIB$SET_THREAD_CALLBACKS(var3);
    214.         UserService$$EnhancerByCGLIB$$4d890297 var10000 = new UserService$$EnhancerByCGLIB$$4d890297;
    215.         switch(var1.length) {
    216.         case 0:
    217.             var10000.<init>();
    218.             CGLIB$SET_THREAD_CALLBACKS((Callback[])null);
    219.             return var10000;
    220.         default:
    221.             throw new IllegalArgumentException("Constructor not found");
    222.         }
    223.     }
    225.     public Callback getCallback(int var1) {
    226.         CGLIB$BIND_CALLBACKS(this);
    227.         MethodInterceptor var10000;
    228.         switch(var1) {
    229.         case 0:
    230.             var10000 = this.CGLIB$CALLBACK_0;
    231.             break;
    232.         default:
    233.             var10000 = null;
    234.         }
    236.         return var10000;
    237.     }
    239.     public void setCallback(int var1, Callback var2) {
    240.         switch(var1) {
    241.         case 0:
    242.             this.CGLIB$CALLBACK_0 = (MethodInterceptor)var2;
    243.         default:
    244.         }
    245.     }
    247.     public Callback[] getCallbacks() {
    248.         CGLIB$BIND_CALLBACKS(this);
    249.         return new Callback[]{this.CGLIB$CALLBACK_0};
    250.     }
    252.     public void setCallbacks(Callback[] var1) {
    253.         this.CGLIB$CALLBACK_0 = (MethodInterceptor)var1[0];
    254.     }
    256.     static {
    257.         CGLIB$STATICHOOK1();
    258.     }
    259. }

    我们发现，UserService代理类既继承了UserService类，也实现了Factory接口，从而代理中就需要去实现Factory接口中的几个方法：

    1. public Object newInstance(Callback[] var1) {
    2.         CGLIB$SET_THREAD_CALLBACKS(var1);
    3.         UserService$$EnhancerByCGLIB$$4d890297 var10000 = new UserService$$EnhancerByCGLIB$$4d890297();
    4.         CGLIB$SET_THREAD_CALLBACKS((Callback[])null);
    5.         return var10000;
    6.     }
    8.     public Object newInstance(Callback var1) {
    9.         CGLIB$SET_THREAD_CALLBACKS(new Callback[]{var1});
    10.         UserService$$EnhancerByCGLIB$$4d890297 var10000 = new UserService$$EnhancerByCGLIB$$4d890297();
    11.         CGLIB$SET_THREAD_CALLBACKS((Callback[])null);
    12.         return var10000;
    13.     }
    15.     public Object newInstance(Class[] var1, Object[] var2, Callback[] var3) {
    16.         CGLIB$SET_THREAD_CALLBACKS(var3);
    17.         UserService$$EnhancerByCGLIB$$4d890297 var10000 = new UserService$$EnhancerByCGLIB$$4d890297;
    18.         switch(var1.length) {
    19.         case 0:
    20.             var10000.<init>();
    21.             CGLIB$SET_THREAD_CALLBACKS((Callback[])null);
    22.             return var10000;
    23.         default:
    24.             throw new IllegalArgumentException("Constructor not found");
    25.         }
    26.     }
    28.     public Callback getCallback(int var1) {
    29.         CGLIB$BIND_CALLBACKS(this);
    30.         MethodInterceptor var10000;
    31.         switch(var1) {
    32.         case 0:
    33.             var10000 = this.CGLIB$CALLBACK_0;
    34.             break;
    35.         default:
    36.             var10000 = null;
    37.         }
    39.         return var10000;
    40.     }
    42.     public void setCallback(int var1, Callback var2) {
    43.         switch(var1) {
    44.         case 0:
    45.             this.CGLIB$CALLBACK_0 = (MethodInterceptor)var2;
    46.         default:
    47.         }
    48.     }
    50.     public Callback[] getCallbacks() {
    51.         CGLIB$BIND_CALLBACKS(this);
    52.         return new Callback[]{this.CGLIB$CALLBACK_0};
    53.     }
    55.     public void setCallbacks(Callback[] var1) {
    56.         this.CGLIB$CALLBACK_0 = (MethodInterceptor)var1[0];
    57.     }

    我们可以发现newInstance()方法会重新生成一个代理对象，setCallbacks()和getCallbacks()可以用来设置或获取增强逻辑。

    我们还发现，不仅只有test()方法会生成对应的两个方法，其他方法也会生成，比如：

    1. equals()
    2. toString()
    3. hashCode()
    4. clone()

    对于这些方法的实现上篇文章已经有所介绍了，所以我们再看一下一下代理类中还有什么代码是我们不熟悉的：

    1. //
    2. // Source code recreated from a .class file by IntelliJ IDEA
    3. // (powered by FernFlower decompiler)
    4. //
    6. package com.zhouyu;
    8. import java.lang.reflect.Method;
    9. import net.sf.cglib.core.ReflectUtils;
    10. import net.sf.cglib.core.Signature;
    11. import net.sf.cglib.proxy.Callback;
    12. import net.sf.cglib.proxy.Factory;
    13. import net.sf.cglib.proxy.MethodInterceptor;
    14. import net.sf.cglib.proxy.MethodProxy;
    16. public class UserService$$EnhancerByCGLIB$$4d890297 extends UserService implements Factory {
    17.     private boolean CGLIB$BOUND;
    18.     public static Object CGLIB$FACTORY_DATA;
    19.     private static final ThreadLocal CGLIB$THREAD_CALLBACKS;
    20.     private static final Callback[] CGLIB$STATIC_CALLBACKS;
    21.     private MethodInterceptor CGLIB$CALLBACK_0;
    22.     private static Object CGLIB$CALLBACK_FILTER;
    23.     private static final Method CGLIB$test$0$Method;
    24.     private static final MethodProxy CGLIB$test$0$Proxy;
    25.     private static final Object[] CGLIB$emptyArgs;
    26.     private static final Method CGLIB$equals$1$Method;
    27.     private static final MethodProxy CGLIB$equals$1$Proxy;
    28.     private static final Method CGLIB$toString$2$Method;
    29.     private static final MethodProxy CGLIB$toString$2$Proxy;
    30.     private static final Method CGLIB$hashCode$3$Method;
    31.     private static final MethodProxy CGLIB$hashCode$3$Proxy;
    32.     private static final Method CGLIB$clone$4$Method;
    33.     private static final MethodProxy CGLIB$clone$4$Proxy;
    35.     static void CGLIB$STATICHOOK1() {
    36.         CGLIB$THREAD_CALLBACKS = new ThreadLocal();
    37.         CGLIB$emptyArgs = new Object[0];
    38.         Class var0 = Class.forName("com.zhouyu.UserService$$EnhancerByCGLIB$$4d890297");
    39.         Class var1;
    40.         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());
    41.         CGLIB$equals$1$Method = var10000[0];
    42.         CGLIB$equals$1$Proxy = MethodProxy.create(var1, var0, "(Ljava/lang/Object;)Z", "equals", "CGLIB$equals$1");
    43.         CGLIB$toString$2$Method = var10000[1];
    44.         CGLIB$toString$2$Proxy = MethodProxy.create(var1, var0, "()Ljava/lang/String;", "toString", "CGLIB$toString$2");
    45.         CGLIB$hashCode$3$Method = var10000[2];
    46.         CGLIB$hashCode$3$Proxy = MethodProxy.create(var1, var0, "()I", "hashCode", "CGLIB$hashCode$3");
    47.         CGLIB$clone$4$Method = var10000[3];
    48.         CGLIB$clone$4$Proxy = MethodProxy.create(var1, var0, "()Ljava/lang/Object;", "clone", "CGLIB$clone$4");
    49.         CGLIB$test$0$Method = ReflectUtils.findMethods(new String[]{"test", "()V"}, (var1 = Class.forName("com.zhouyu.UserService")).getDeclaredMethods())[0];
    50.         CGLIB$test$0$Proxy = MethodProxy.create(var1, var0, "()V", "test", "CGLIB$test$0");
    51.     }
    53.     final void CGLIB$test$0() {
    54.         super.test();
    55.     }
    57.     public final void test() {
    58.         MethodInterceptor var10000 = this.CGLIB$CALLBACK_0;
    59.         if (var10000 == null) {
    60.             CGLIB$BIND_CALLBACKS(this);
    61.             var10000 = this.CGLIB$CALLBACK_0;
    62.         }
    64.         if (var10000 != null) {
    65.             var10000.intercept(this, CGLIB$test$0$Method, CGLIB$emptyArgs, CGLIB$test$0$Proxy);
    66.         } else {
    67.             super.test();
    68.         }
    69.     }
    72.     public static MethodProxy CGLIB$findMethodProxy(Signature var0) {
    73.         String var10000 = var0.toString();
    74.         switch(var10000.hashCode()) {
    75.         case -1422510685:
    76.             if (var10000.equals("test()V")) {
    77.                 return CGLIB$test$0$Proxy;
    78.             }
    79.             break;
    80.         case -508378822:
    81.             if (var10000.equals("clone()Ljava/lang/Object;")) {
    82.                 return CGLIB$clone$4$Proxy;
    83.             }
    84.             break;
    85.         case 1826985398:
    86.             if (var10000.equals("equals(Ljava/lang/Object;)Z")) {
    87.                 return CGLIB$equals$1$Proxy;
    88.             }
    89.             break;
    90.         case 1913648695:
    91.             if (var10000.equals("toString()Ljava/lang/String;")) {
    92.                 return CGLIB$toString$2$Proxy;
    93.             }
    94.             break;
    95.         case 1984935277:
    96.             if (var10000.equals("hashCode()I")) {
    97.                 return CGLIB$hashCode$3$Proxy;
    98.             }
    99.         }
    101.         return null;
    102.     }
    104.     public UserService$$EnhancerByCGLIB$$4d890297() {
    105.         CGLIB$BIND_CALLBACKS(this);
    106.     }
    108.     public static void CGLIB$SET_THREAD_CALLBACKS(Callback[] var0) {
    109.         CGLIB$THREAD_CALLBACKS.set(var0);
    110.     }
    112.     public static void CGLIB$SET_STATIC_CALLBACKS(Callback[] var0) {
    113.         CGLIB$STATIC_CALLBACKS = var0;
    114.     }
    116.     private static final void CGLIB$BIND_CALLBACKS(Object var0) {
    117.         UserService$$EnhancerByCGLIB$$4d890297 var1 = (UserService$$EnhancerByCGLIB$$4d890297)var0;
    118.         if (!var1.CGLIB$BOUND) {
    119.             var1.CGLIB$BOUND = true;
    120.             Object var10000 = CGLIB$THREAD_CALLBACKS.get();
    121.             if (var10000 == null) {
    122.                 var10000 = CGLIB$STATIC_CALLBACKS;
    123.                 if (var10000 == null) {
    124.                     return;
    125.                 }
    126.             }
    128.             var1.CGLIB$CALLBACK_0 = (MethodInterceptor)((Callback[])var10000)[0];
    129.         }
    131.     }
    133.     static {
    134.         CGLIB$STATICHOOK1();
    135.     }
    136. }

    我们发现代理中有很多的属性，仔细阅读可以发现，这些属性中很多都是针对某个方法的Method对象和MethodProxy对象，我们先把equals等所对应的先去掉：

    1. //
    2. // Source code recreated from a .class file by IntelliJ IDEA
    3. // (powered by FernFlower decompiler)
    4. //
    6. package com.zhouyu;
    8. import java.lang.reflect.Method;
    9. import net.sf.cglib.core.ReflectUtils;
    10. import net.sf.cglib.core.Signature;
    11. import net.sf.cglib.proxy.Callback;
    12. import net.sf.cglib.proxy.Factory;
    13. import net.sf.cglib.proxy.MethodInterceptor;
    14. import net.sf.cglib.proxy.MethodProxy;
    16. public class UserService$$EnhancerByCGLIB$$4d890297 extends UserService implements Factory {
    17.     private boolean CGLIB$BOUND;
    18.     public static Object CGLIB$FACTORY_DATA;
    19.     private static final ThreadLocal CGLIB$THREAD_CALLBACKS;
    20.     private static final Callback[] CGLIB$STATIC_CALLBACKS;
    21.     private MethodInterceptor CGLIB$CALLBACK_0;
    22.     private static Object CGLIB$CALLBACK_FILTER;
    23.     private static final Method CGLIB$test$0$Method;
    24.     private static final MethodProxy CGLIB$test$0$Proxy;
    25.     private static final Object[] CGLIB$emptyArgs;
    27.     static void CGLIB$STATICHOOK1() {
    28.         CGLIB$THREAD_CALLBACKS = new ThreadLocal();
    29.         CGLIB$emptyArgs = new Object[0];
    30.         Class var0 = Class.forName("com.zhouyu.UserService$$EnhancerByCGLIB$$4d890297");
    31.         Class var1;
    32.         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());
    33.         CGLIB$test$0$Method = ReflectUtils.findMethods(new String[]{"test", "()V"}, (var1 = Class.forName("com.zhouyu.UserService")).getDeclaredMethods())[0];
    34.         CGLIB$test$0$Proxy = MethodProxy.create(var1, var0, "()V", "test", "CGLIB$test$0");
    35.     }
    37.     final void CGLIB$test$0() {
    38.         super.test();
    39.     }
    41.     public final void test() {
    42.         MethodInterceptor var10000 = this.CGLIB$CALLBACK_0;
    43.         if (var10000 == null) {
    44.             CGLIB$BIND_CALLBACKS(this);
    45.             var10000 = this.CGLIB$CALLBACK_0;
    46.         }
    48.         if (var10000 != null) {
    49.             var10000.intercept(this, CGLIB$test$0$Method, CGLIB$emptyArgs, CGLIB$test$0$Proxy);
    50.         } else {
    51.             super.test();
    52.         }
    53.     }
    56.     public static MethodProxy CGLIB$findMethodProxy(Signature var0) {
    57.         String var10000 = var0.toString();
    58.         switch(var10000.hashCode()) {
    59.         case -1422510685:
    60.             if (var10000.equals("test()V")) {
    61.                 return CGLIB$test$0$Proxy;
    62.             }
    63.             break;
    64.         case -508378822:
    65.             if (var10000.equals("clone()Ljava/lang/Object;")) {
    66.                 return CGLIB$clone$4$Proxy;
    67.             }
    68.             break;
    69.         case 1826985398:
    70.             if (var10000.equals("equals(Ljava/lang/Object;)Z")) {
    71.                 return CGLIB$equals$1$Proxy;
    72.             }
    73.             break;
    74.         case 1913648695:
    75.             if (var10000.equals("toString()Ljava/lang/String;")) {
    76.                 return CGLIB$toString$2$Proxy;
    77.             }
    78.             break;
    79.         case 1984935277:
    80.             if (var10000.equals("hashCode()I")) {
    81.                 return CGLIB$hashCode$3$Proxy;
    82.             }
    83.         }
    85.         return null;
    86.     }
    88.     public UserService$$EnhancerByCGLIB$$4d890297() {
    89.         CGLIB$BIND_CALLBACKS(this);
    90.     }
    92.     public static void CGLIB$SET_THREAD_CALLBACKS(Callback[] var0) {
    93.         CGLIB$THREAD_CALLBACKS.set(var0);
    94.     }
    96.     public static void CGLIB$SET_STATIC_CALLBACKS(Callback[] var0) {
    97.         CGLIB$STATIC_CALLBACKS = var0;
    98.     }
    100.     private static final void CGLIB$BIND_CALLBACKS(Object var0) {
    101.         UserService$$EnhancerByCGLIB$$4d890297 var1 = (UserService$$EnhancerByCGLIB$$4d890297)var0;
    102.         if (!var1.CGLIB$BOUND) {
    103.             var1.CGLIB$BOUND = true;
    104.             Object var10000 = CGLIB$THREAD_CALLBACKS.get();
    105.             if (var10000 == null) {
    106.                 var10000 = CGLIB$STATIC_CALLBACKS;
    107.                 if (var10000 == null) {
    108.                     return;
    109.                 }
    110.             }
    112.             var1.CGLIB$CALLBACK_0 = (MethodInterceptor)((Callback[])var10000)[0];
    113.         }
    115.     }
    117.     static {
    118.         CGLIB$STATICHOOK1();
    119.     }
    120. }

    代理类中有一个代理块，会调用CGLIB$STATICHOOK1()，这个方法主要就是给属性赋值，比如：

    1. 构造一个ThreadLocal对象给CGLIB$THREAD_CALLBACKS属性
    2. 获取UserService类中的test方法的Method对象给CGLIB$test$0$Method属性
    3. 构造test()方法所对应的MethodProxy对象给CGLIB$test$0$Proxy属性

    另外，代理类中还有一些其他方法，但是我看了源码后，发现有几个方法它只是生成了，并没有被调用到，其中有一个方法是cglib在生成代理对象后，会主动调用的一个方法，这个方法是CGLIB$SET_THREAD_CALLBACKS，我把其他几个不用的方法去掉：

    1. //
    2. // Source code recreated from a .class file by IntelliJ IDEA
    3. // (powered by FernFlower decompiler)
    4. //
    6. package com.zhouyu;
    8. import java.lang.reflect.Method;
    9. import net.sf.cglib.core.ReflectUtils;
    10. import net.sf.cglib.core.Signature;
    11. import net.sf.cglib.proxy.Callback;
    12. import net.sf.cglib.proxy.Factory;
    13. import net.sf.cglib.proxy.MethodInterceptor;
    14. import net.sf.cglib.proxy.MethodProxy;
    16. public class UserService$$EnhancerByCGLIB$$4d890297 extends UserService implements Factory {
    17.     private boolean CGLIB$BOUND;
    18.     public static Object CGLIB$FACTORY_DATA;
    19.     private static final ThreadLocal CGLIB$THREAD_CALLBACKS;
    20.     private static final Callback[] CGLIB$STATIC_CALLBACKS;
    21.     private MethodInterceptor CGLIB$CALLBACK_0;
    22.     private static Object CGLIB$CALLBACK_FILTER;
    23.     private static final Method CGLIB$test$0$Method;
    24.     private static final MethodProxy CGLIB$test$0$Proxy;
    25.     private static final Object[] CGLIB$emptyArgs;
    27.     static void CGLIB$STATICHOOK1() {
    28.         CGLIB$THREAD_CALLBACKS = new ThreadLocal();
    29.         CGLIB$emptyArgs = new Object[0];
    30.         Class var0 = Class.forName("com.zhouyu.UserService$$EnhancerByCGLIB$$4d890297");
    31.         Class var1;
    32.         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());
    33.         CGLIB$test$0$Method = ReflectUtils.findMethods(new String[]{"test", "()V"}, (var1 = Class.forName("com.zhouyu.UserService")).getDeclaredMethods())[0];
    34.         CGLIB$test$0$Proxy = MethodProxy.create(var1, var0, "()V", "test", "CGLIB$test$0");
    35.     }
    37.     final void CGLIB$test$0() {
    38.         super.test();
    39.     }
    41.     public final void test() {
    42.         MethodInterceptor var10000 = this.CGLIB$CALLBACK_0;
    43.         if (var10000 == null) {
    44.             CGLIB$BIND_CALLBACKS(this);
    45.             var10000 = this.CGLIB$CALLBACK_0;
    46.         }
    48.         if (var10000 != null) {
    49.             var10000.intercept(this, CGLIB$test$0$Method, CGLIB$emptyArgs, CGLIB$test$0$Proxy);
    50.         } else {
    51.             super.test();
    52.         }
    53.     }
    55.     // 构造方法
    56.     public UserService$$EnhancerByCGLIB$$4d890297() {
    57.         CGLIB$BIND_CALLBACKS(this);
    58.     }
    60.     public static void CGLIB$SET_THREAD_CALLBACKS(Callback[] var0) {
    61.         CGLIB$THREAD_CALLBACKS.set(var0);
    62.     }
    64.     private static final void CGLIB$BIND_CALLBACKS(Object var0) {
    65.         UserService$$EnhancerByCGLIB$$4d890297 var1 = (UserService$$EnhancerByCGLIB$$4d890297)var0;
    66.         if (!var1.CGLIB$BOUND) {
    67.             var1.CGLIB$BOUND = true;
    68.             Object var10000 = CGLIB$THREAD_CALLBACKS.get();
    69.             if (var10000 == null) {
    70.                 var10000 = CGLIB$STATIC_CALLBACKS;
    71.                 if (var10000 == null) {
    72.                     return;
    73.                 }
    74.             }
    76.             var1.CGLIB$CALLBACK_0 = (MethodInterceptor)((Callback[])var10000)[0];
    77.         }
    79.     }
    82.     static {
    83.         CGLIB$STATICHOOK1();
    84.     }
    85. }

    这样，我们就可以更加理解这个代理类了，大致流程是：

    1. cglib先生成代理类
    2. 然后调用构造方法得到代理对象
    3. 然后cglib调用代理对象的CGLIB$SET_THREAD_CALLBACKS()方法，把程序员所设置的Callbacks设置到CGLIB$THREAD_CALLBACKS这个ThreadLocal中
    4. 后续代理对象在执行test()方法时，就会从CGLIB$THREAD_CALLBACKS拿到所设置的Callbacks，调用其intercept()方法

    而代理类的生成逻辑就是：

    1. 先生成类的定义，实现UserService和Factory接口
    2. 根据UserService类中的方法生成代理类中对应的方法和属性
    3. 生成一些辅助的属性和方法

    具体源码就不去分析了，感兴趣的可以自己花时间去啃了。

    文章到这里，还有还有一个点没分析，就是MethodProxy对象，下篇文章继续。