sun.misc.ProxyGenerator Java Examples

The following examples show how to use sun.misc.ProxyGenerator. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.

Example #1

Source File: Test.java From DesignPatterns with Apache License 2.0

5 votes

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

        // 目标对象
        IUserDao target = new UserDao();
        // 【原始的类型 class cn.itcast.b_dynamic.UserDao】
        System.out.println(target.getClass());

        // 给目标对象，创建代理对象
        IUserDao proxy = (IUserDao) new ProxyFactory(target).getProxyInstance();
        // class $Proxy0   内存中动态生成的代理对象
        System.out.println(proxy.getClass());


        //原理：
        //1、拿到被代理对象的引用，并且获取到它的所有的接口，反射获取
        //2、JDK Proxy类重新生成一个新的类、同时新的类要实现被代理类所有实现的所有的接口
        //3、动态生成Java代码，把新加的业务逻辑方法由一定的逻辑代码去调用（在代码中体现）
        //4、编译新生成的Java代码.class
        //5、再重新加载到JVM中运行
        //以上这个过程就叫字节码重组

        //JDK中有个规范，只要要是$开头的一般都是自动生成的

        //通过反编译工具可以查看源代码
        byte [] bytes = ProxyGenerator.generateProxyClass("$Proxy0",new Class[]{IUserDao.class});
        FileOutputStream os = new FileOutputStream("D://$Proxy0.class");
        os.write(bytes);
        os.close();


        // 执行方法   【代理对象】
        proxy.save();
    }

Example #2

Source File: JDKDynamicProxyClient.java From JavaDesignPattern with Apache License 2.0

5 votes

public static void main(String[] args) throws IOException {
  InvocationHandler handler = new SubjectProxyHandler(ConcreteSubject.class);
  ISubject subject =
      (ISubject) Proxy.newProxyInstance(JDKDynamicProxyClient.class.getClassLoader(),
          new Class[] {ISubject.class}, handler);
  subject.action();
  LOG.info("Proxy class name {}", subject.getClass().getName());
  byte[] classFile = ProxyGenerator.generateProxyClass("$Proxy18", ConcreteSubject.class.getInterfaces());  
  try(OutputStream outputStream = new FileOutputStream("$Proxy18.class")){
    IOUtils.write(classFile, outputStream);
  }
}