序列化单例模式的实现————readResolve 源码解读

class SingletonTest {
  
  */***
   ** 序列化测试公共方法*
   *** *@param* *className*
   **/*
   private void testSerializable(String className) {
    if (className == null) {
      throw new RuntimeException("className不能为null");
    }
    Class<?> clazz = null;
    Object obj = null;
    try {
      clazz = Class.forName(className);
      Method method = clazz.getMethod("getInstance");
      obj = method.invoke(null);
    } catch (ClassNotFoundException | NoSuchMethodException | IllegalAccessException | InvocationTargetException e) {
      e.printStackTrace();
    }
    int lastIndexOf = className.lastIndexOf(".");
    String realName = className.substring(lastIndexOf + 1);
    String objName = realName + ".obj";
    Object s1 = null;
    Object s2 = obj;


    FileOutputStream fileOutputStream = null;
    try {
      fileOutputStream = new FileOutputStream(objName);
      ObjectOutputStream objectOutputStream = new ObjectOutputStream(fileOutputStream);
      objectOutputStream.writeObject(s2);
      objectOutputStream.flush();
      objectOutputStream.close();
      FileInputStream fileInputStream = new FileInputStream(objName);
      ObjectInputStream objectInputStream = new ObjectInputStream(fileInputStream);
      Object o = objectInputStream.readObject();
      s1 = o;
      objectInputStream.close();


      System.out.println(s1);
      System.out.println(s2);
      System.out.println(s1 == s2);




    } catch (IOException | ClassNotFoundException e) {
      e.printStackTrace();
    }
  }


  */***
   ** 序列化单例模式l*
   **/*
  @Test
  void testSerializableSingleton() {
    testSerializable("com.example.demo.singleton.SerializableSingleton");
  }


}