Aop动态代理和cglib实现代码详解

public interface InterF {
  public void save();
}

public class Origin implements InterF{
  @Override
  public void save() {
    System.out.println("测试一下");
  }
}

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;

/**
 * @author bai
 * @create 2019-10-25-16:47
 */
public class ProxyJdk implements InvocationHandler {

  private Object target;

  public Object getProxy(Object target){
    this.target=target;
    return Proxy.newProxyInstance(this.getClass().getClassLoader(),target.getClass().getInterfaces(),this);

  }

  @Override
  public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {

    System.out.println("我来了");
    Object invoke = method.invoke(target, args);
    System.out.println("我走了");
    return invoke;
  }
}

public class Mytest {
  public static void main(String[] args) {
    Origin o=new Origin();
    ProxyJdk pj=new ProxyJdk();
    InterF proxy = (InterF) pj.getProxy(o);

    proxy.save();
  }
}

public class Origin{
  public void save() {
    System.out.println("测试一下");
  }
}

import net.sf.cglib.proxy.Enhancer;
import net.sf.cglib.proxy.MethodInterceptor;
import net.sf.cglib.proxy.MethodProxy;

import java.lang.reflect.Method;

/**
 * @author bai
 * @create 2019-10-25-17:26
 */
public class CglibProxy implements MethodInterceptor{
  private Object target;//被代理目标

  public Object getProxy(Object target){
    this.target=target;
    Enhancer enhancer = new Enhancer();
//1.设置基类
    enhancer.setSuperclass(target.getClass());
//2.设置回调接口
    enhancer.setCallback(this);//MethodInterceptor实现类
//3.创建动态代理
    return enhancer.create();
  }
  @Override
  public Object intercept(Object o, Method method, Object[] objects, MethodProxy methodProxy) throws Throwable {
    System.out.println("准备前");
    Object invoke = method.invoke(target, objects);
    System.out.println("准备后");
    return invoke;
  }
}

public class Mytest2 {
  public static void main(String[] args) {
    Origin o=new Origin();
    CglibProxy cp=new CglibProxy();
    Origin proxy = (Origin) cp.getProxy(o);
    proxy.save();
  }
}