深入浅析java 1.8 中动态代理的原理

class proxyed implements pro{ @Override public void text() {  System.err.println("本方法"); }}interface pro { void text();}public class JavaProxy implements InvocationHandler {  private Object source;  public JavaProxy(Object source) {   super();   this.source = source;  }  public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {   System.out.println("before");   Object invoke = method.invoke(source, args);   System.out.println("after");   return invoke;  }  public Object getProxy(){   return Proxy.newProxyInstance(getClass().getClassLoader(), source.getClass().getInterfaces(), this);  }  public static void main(String[] args) throws IllegalAccessException, InvocationTargetException, InstantiationException, NoSuchMethodException {   //第一种，自己写   //1.设置saveGeneratedFiles值为true则生成 class字节码文件方便分析   System.getProperties().put("sun.misc.ProxyGenerator.saveGeneratedFiles", "true");   //2.获取动态代理类   Class proxyClazz = Proxy.getProxyClass(pro.class.getClassLoader(),pro.class);   //3.获得代理类的构造函数，并传入参数类型InvocationHandler.class   Constructor constructor = proxyClazz.getConstructor(InvocationHandler.class);   //4.通过构造函数来创建动态代理对象，将自定义的InvocationHandler实例传入   pro iHello = (pro) constructor.newInstance(new JavaProxy(new proxyed()));   //5.通过代理对象调用目标方法   iHello.text();   //第二种，调用JDK提供的方法，实现了2~4步   Proxy.newProxyInstance(JavaProxy.class.getClassLoader(),proxyed.class.getInterfaces(),new JavaProxy(new proxyed()));  }}