JDK动态代理，获取动态生成的代理类的class文件

1、定义一个接口

public interface IHandlerInterface {   
    public void test();
}

2、定义实现类

public class RealHandlerInterface implements IHandlerInterface {  
   @Override   
   public void test() {       
       ServiLogger.log("RealHandlerInterface: test");   
   }
}

3、写个静态方法输出动态代理生成的class文件

    private static void saveProxyFile() {
        FileOutputStream out = null;
        try {
            byte[] classFile = ProxyGenerator.generateProxyClass("$Proxy0", RealHandlerInterface.class.getInterfaces());
            out = new FileOutputStream("C:\\Users\\Administrator\\Desktop\\IHandlerInterface" + "$Proxy0.class");
            out.write(classFile);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (out != null) {
                    out.flush();
                    out.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

4、在main方法中调用3的静态方法，执行即可

    public static void main(String[] args) throws Exception {
        saveProxyFile();
    }

5、查看生成的代理类的class文件，可直接把文件拖入IDEA中

import com.servi.cloud.consumer.util.proxy.jdk.IHandlerInterface;
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 IHandlerInterface {
    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 test() 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.servi.cloud.consumer.util.proxy.jdk.IHandlerInterface").getMethod("test");
            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());
        }
    }
}