炒冷饭之 动态代理

前面把项目中javassist生成过程梳理了一遍，对于最先接触的动态代理也整理下，有机会把asm和cglib也弄弄


package com.**.reflect;

import java.io.File;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.Properties;

public class DynamicProxyTest {
interface Father {
void say();
}

static class Son implements Father {
@Override
public void say() {
System.out.println("Son is saying...");
}

}

static class ProxyClass implements InvocationHandler {

private Father father;

protected ProxyClass(Father father) {
this.father = father;
}

public Object getInstance() {
return Proxy.newProxyInstance(this.father.getClass()
.getClassLoader(), this.father.getClass().getInterfaces(),
this);
}

@Override
public Object invoke(Object proxy, Method method, Object[] args)
throws Throwable {
System.out.println("proxy invoke...");
return method.invoke(father, args);
}

}

/**
* @param args
* @throws NoSuchFieldException
* @throws SecurityException
* @throws IllegalAccessException
* @throws IllegalArgumentException
*/
public static void main(String[] args) throws SecurityException, NoSuchFieldException, IllegalArgumentException, IllegalAccessException {

System.out.println(File.pathSeparator);

Package pkg = DynamicProxyTest.class.getPackage();
if (pkg != null) {
String packagePath = pkg.getName().replace(".", "\\");
boolean file =new File(packagePath).mkdirs();
System.out.println(file);
}

System.getProperties().setProperty(
"sun.misc.ProxyGenerator.saveGeneratedFiles", "true");

Father son = new Son();
ProxyClass proxyClass = new ProxyClass(son);
Father sonProxy = (Father) proxyClass.getInstance();
sonProxy.say();

}
}


//生成的代理类
package com.**.reflect;

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 DynamicProxyTest.Father
{
  private static Method m3;
  private static Method m1;
  private static Method m0;
  private static Method m2;

  public $Proxy0(InvocationHandler paramInvocationHandler)
    throws
  {
    super(paramInvocationHandler);
  }

  public final void say()
    throws
  {
    try
    {
      this.h.invoke(this, m3, null);
      return;
    }
    catch (RuntimeException localRuntimeException)
    {
      throw localRuntimeException;
    }
    catch (Throwable localThrowable)
    {
      throw new UndeclaredThrowableException(localThrowable);
    }
  }

  public final boolean equals(Object paramObject)
    throws
  {
    try
    {
      return ((Boolean)this.h.invoke(this, m1, new Object[] { paramObject })).booleanValue();
    }
    catch (RuntimeException localRuntimeException)
    {
      throw localRuntimeException;
    }
    catch (Throwable localThrowable)
    {
      throw new UndeclaredThrowableException(localThrowable);
    }
  }

  public final int hashCode()
    throws
  {
    try
    {
      return ((Integer)this.h.invoke(this, m0, null)).intValue();
    }
    catch (RuntimeException localRuntimeException)
    {
      throw localRuntimeException;
    }
    catch (Throwable localThrowable)
    {
      throw new UndeclaredThrowableException(localThrowable);
    }
  }

  public final String toString()
    throws
  {
    try
    {
      return ((String)this.h.invoke(this, m2, null));
    }
    catch (RuntimeException localRuntimeException)
    {
      throw localRuntimeException;
    }
    catch (Throwable localThrowable)
    {
      throw new UndeclaredThrowableException(localThrowable);
    }
  }

  static
  {
    try
    {
      m3 = Class.forName("com.liuyi.reflect.DynamicProxyTest$Father").getMethod("say", new Class[0]);
      m1 = Class.forName("java.lang.Object").getMethod("equals", new Class[] { Class.forName("java.lang.Object") });
      m0 = Class.forName("java.lang.Object").getMethod("hashCode", new Class[0]);
      m2 = Class.forName("java.lang.Object").getMethod("toString", new Class[0]);
      return;
    }
    catch (NoSuchMethodException localNoSuchMethodException)
    {
      throw new NoSuchMethodError(localNoSuchMethodException.getMessage());
    }
    catch (ClassNotFoundException localClassNotFoundException)
    {
      throw new NoClassDefFoundError(localClassNotFoundException.getMessage());
    }
  }
}