java - java可序列化对象可以在不同的类加载器之间传递吗？

Question

最近在学习java程序语言，对java的序列化很好奇，也有一点疑惑。

Can java serializable objects pass between different classloaders? What's the theory?

Answer 1

仅通过实现 Serialized 接口(interface)将不允许您“在不同的类加载器之间传递”。您需要编写代码将序列化对象持久保存到磁盘，然后在另一个类加载器(进程)上将其反序列化。这是一个例子，取自http://www.javapractices.com/topic/TopicAction.do?Id=57 :

    Car car = new Car();
    ....

    //serialize an object called it car to a file called car.ser.
    try (
      OutputStream file = new FileOutputStream("car.ser");
      OutputStream buffer = new BufferedOutputStream(file);
      ObjectOutput output = new ObjectOutputStream(buffer);
    ){
      output.writeObject(car); // this call writes file to disk
    }  
    catch(IOException ex){
      logger.log(Level.SEVERE, "Cannot perform output.", ex);
    }

要反序列化另一端/类加载器/jvm 进程上的对象，您可以执行以下操作:

 try(
      InputStream file = new FileInputStream("car.ser");
      InputStream buffer = new BufferedInputStream(file);
      ObjectInput input = new ObjectInputStream (buffer);
    ){
      //deserialize the List
      Car car = (Car)input.readObject();
      //display its data
      System.out.println("Recovered Car: " + car);

    }
    catch(ClassNotFoundException ex){
      logger.log(Level.SEVERE, "Cannot perform input. Class not found.", ex);
    }
    catch(IOException ex){
      logger.log(Level.SEVERE, "Cannot perform input.", ex);
    }

编辑: 为了获取序列化文件并反序列化它们，您可以使用 WatchService