1、jdk动态代理
package com.j.mode.proxy; import java.lang.reflect.InvocationHandler; import java.lang.reflect.Method; import java.lang.reflect.Proxy; public class ProxyJDKTest { public static void main(String[] args) { //生成字节码 System.getProperties().put("sun.misc.ProxyGenerator.saveGeneratedFiles","true"); Moveable t = (Moveable)Proxy.newProxyInstance(Tank.class.getClassLoader(), new Class[]{Moveable.class}, new MyInvocationHandler(new Tank())); t.move(); } } class MyInvocationHandler implements InvocationHandler{ Object obj; public MyInvocationHandler(Object o) { this.obj = o; } @Override public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { System.out.println("before...."); Object r = method.invoke(obj, args); System.out.println("after...."); return r; } } interface Moveable{ void move(); } class Tank implements Moveable { @Override public void move() { System.out.println("gogoogogog................"); } }
2、cglib代理
package com.j.mode.proxy; import net.sf.cglib.core.DebuggingClassWriter; import net.sf.cglib.proxy.Enhancer; import net.sf.cglib.proxy.MethodInterceptor; import net.sf.cglib.proxy.MethodProxy; import java.lang.reflect.Method; public class ProxyCglibTest { public static void main(String[] args) { //生成字节码 System.setProperty(DebuggingClassWriter.DEBUG_LOCATION_PROPERTY, "E:\\zasui"); Enhancer cer = new Enhancer(); cer.setSuperclass(User.class); cer.setCallback(new MyMethodInterceptor()); User u = (User)cer.create(); u.getName(); } } class User{ private String name; private int age; public User() { } public User(String name) { this.name = name; } public String getName() { System.out.println(" My name is " + this.name); return this.name; } } class MyMethodInterceptor implements MethodInterceptor{ @Override public Object intercept(Object o, Method method, Object[] objects, MethodProxy methodProxy) throws Throwable { System.out.println("======插入前置通知======"); Object result = methodProxy.invokeSuper(o, objects); System.out.println("======插入后者通知======"); return result; } }
3、 区别
名称备注
静态代理简单,代理模式,是动态代理的理论基础。常见使用在代理模式
jdk动态代理
需要有顶层接口才能使用,但是在只有顶层接口的时候也可以使用,常见是mybatis的mapper文件是代理。
使用反射完成。使用了动态生成字节码技术。
cglib动态代理可以直接代理类,使用字节码技术,不能对 final类进行继承。使用了动态生成字节码技术。
4、jgk字节码:
// // Source code recreated from a .class file by IntelliJ IDEA // (powered by Fernflower decompiler) // package com.j.mode.proxy; import java.lang.reflect.InvocationHandler; import java.lang.reflect.Method; import java.lang.reflect.Proxy; import java.lang.reflect.UndeclaredThrowableException; final class $Proxy0 extends Proxy implements Moveable { private static Method m1; private static Method m3; private static Method m2; private static Method m0; 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 void move() throws { try { super.h.invoke(this, m3, (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); } } 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")); m3 = Class.forName("com.j.mode.proxy.Moveable").getMethod("move"); m2 = Class.forName("java.lang.Object").getMethod("toString"); m0 = Class.forName("java.lang.Object").getMethod("hashCode"); } catch (NoSuchMethodException var2) { throw new NoSuchMethodError(var2.getMessage()); } catch (ClassNotFoundException var3) { throw new NoClassDefFoundError(var3.getMessage()); } } }
5、cglib 字节码
// // Source code recreated from a .class file by IntelliJ IDEA // (powered by Fernflower decompiler) // package com.j.mode.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 User$$EnhancerByCGLIB$$acf63e5b extends User 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$getName$0$Method; private static final MethodProxy CGLIB$getName$0$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]; Class var0 = Class.forName("com.j.mode.proxy.User$$EnhancerByCGLIB$$acf63e5b"); Class var1; CGLIB$getName$0$Method = ReflectUtils.findMethods(new String[]{"getName", "()Ljava/lang/String;"}, (var1 = Class.forName("com.j.mode.proxy.User")).getDeclaredMethods())[0]; CGLIB$getName$0$Proxy = MethodProxy.create(var1, var0, "()Ljava/lang/String;", "getName", "CGLIB$getName$0"); Method[] var10000 = ReflectUtils.findMethods(new String[]{"equals", "(Ljava/lang/Object;)Z", "toString", "()Ljava/lang/String;", "hashCode", "()I", "clone", "()Ljava/lang/Object;"}, (var1 = Class.forName("java.lang.Object")).getDeclaredMethods()); CGLIB$equals$1$Method = var10000[0]; CGLIB$equals$1$Proxy = MethodProxy.create(var1, var0, "(Ljava/lang/Object;)Z", "equals", "CGLIB$equals$1"); CGLIB$toString$2$Method = var10000[1]; CGLIB$toString$2$Proxy = MethodProxy.create(var1, var0, "()Ljava/lang/String;", "toString", "CGLIB$toString$2"); CGLIB$hashCode$3$Method = var10000[2]; CGLIB$hashCode$3$Proxy = MethodProxy.create(var1, var0, "()I", "hashCode", "CGLIB$hashCode$3"); CGLIB$clone$4$Method = var10000[3]; CGLIB$clone$4$Proxy = MethodProxy.create(var1, var0, "()Ljava/lang/Object;", "clone", "CGLIB$clone$4"); } final String CGLIB$getName$0() { return super.getName(); } public final String getName() { MethodInterceptor var10000 = this.CGLIB$CALLBACK_0; if (this.CGLIB$CALLBACK_0 == null) { CGLIB$BIND_CALLBACKS(this); var10000 = this.CGLIB$CALLBACK_0; } return var10000 != null ? (String)var10000.intercept(this, CGLIB$getName$0$Method, CGLIB$emptyArgs, CGLIB$getName$0$Proxy) : super.getName(); } final boolean CGLIB$equals$1(Object var1) { return super.equals(var1); } public final boolean equals(Object var1) { MethodInterceptor var10000 = this.CGLIB$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$1$Method, new Object[]{var1}, CGLIB$equals$1$Proxy); return var2 == null ? false : (Boolean)var2; } else { return super.equals(var1); } } final String CGLIB$toString$2() { return super.toString(); } public final String toString() { MethodInterceptor var10000 = this.CGLIB$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$2$Method, CGLIB$emptyArgs, CGLIB$toString$2$Proxy) : super.toString(); } final int CGLIB$hashCode$3() { return super.hashCode(); } public final int hashCode() { MethodInterceptor var10000 = this.CGLIB$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$3$Method, CGLIB$emptyArgs, CGLIB$hashCode$3$Proxy); return var1 == null ? 0 : ((Number)var1).intValue(); } else { return super.hashCode(); } } final Object CGLIB$clone$4() throws CloneNotSupportedException { return super.clone(); } protected final Object clone() throws CloneNotSupportedException { MethodInterceptor var10000 = this.CGLIB$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$4$Method, CGLIB$emptyArgs, CGLIB$clone$4$Proxy) : super.clone(); } public static MethodProxy CGLIB$findMethodProxy(Signature var0) { String var10000 = var0.toString(); switch(var10000.hashCode()) { case -508378822: if (var10000.equals("clone()Ljava/lang/Object;")) { return CGLIB$clone$4$Proxy; } break; case 1218144844: if (var10000.equals("getName()Ljava/lang/String;")) { return CGLIB$getName$0$Proxy; } break; case 1826985398: if (var10000.equals("equals(Ljava/lang/Object;)Z")) { return CGLIB$equals$1$Proxy; } break; case 1913648695: if (var10000.equals("toString()Ljava/lang/String;")) { return CGLIB$toString$2$Proxy; } break; case 1984935277: if (var10000.equals("hashCode()I")) { return CGLIB$hashCode$3$Proxy; } } return null; } public User$$EnhancerByCGLIB$$acf63e5b() { CGLIB$BIND_CALLBACKS(this); } public User$$EnhancerByCGLIB$$acf63e5b(String var1) { super(var1); 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) { User$$EnhancerByCGLIB$$acf63e5b var1 = (User$$EnhancerByCGLIB$$acf63e5b)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); User$$EnhancerByCGLIB$$acf63e5b var10000 = new User$$EnhancerByCGLIB$$acf63e5b(); CGLIB$SET_THREAD_CALLBACKS((Callback[])null); return var10000; } public Object newInstance(Callback var1) { CGLIB$SET_THREAD_CALLBACKS(new Callback[]{var1}); User$$EnhancerByCGLIB$$acf63e5b var10000 = new User$$EnhancerByCGLIB$$acf63e5b(); CGLIB$SET_THREAD_CALLBACKS((Callback[])null); return var10000; } public Object newInstance(Class[] var1, Object[] var2, Callback[] var3) { CGLIB$SET_THREAD_CALLBACKS(var3); User$$EnhancerByCGLIB$$acf63e5b var10000 = new User$$EnhancerByCGLIB$$acf63e5b; switch(var1.length) { case 0: var10000.<init>(); break; case 1: if (var1[0].getName().equals("java.lang.String")) { var10000.<init>((String)var2[0]); break; } throw new IllegalArgumentException("Constructor not found"); default: throw new IllegalArgumentException("Constructor not found"); } CGLIB$SET_THREAD_CALLBACKS((Callback[])null); return var10000; } public Callback getCallback(int var1) { CGLIB$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(); } }
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