对象流

@Test
	public void testOut() {
		ObjectOutputStream oos = null;
		try {
			oos = new ObjectOutputStream(new FileOutputStream("Person.txt"));
			Person p = new Person(23, "chen", new Pet("2", "dog"));
			oos.writeObject(p);
		} catch (SecurityException e) {
			e.printStackTrace();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try {
				if (oos != null) {
					oos.close();
				}
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}
	@Test
	public void testIn() {
		ObjectInputStream ois = null;
		try {
			ois = new ObjectInputStream(new FileInputStream("Person.txt"));
			Person p = (Person) ois.readObject();
			System.out.println(p);
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			if (ois != null) {
				try {
					ois.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
	}
}
class Person implements Serializable {
	public static final long serialVersionUID = 1L;
	Integer age;
	String name;
	Pet pet;
	public Person(Integer age, String name, Pet pet) {
		super();
		this.age = age;
		this.name = name;
		this.pet = pet;
	}
	@Override
	public String toString() {
		return "Person [age=" + age + ", name=" + name + ", pet=" + pet + "]";
	}
}
class Pet implements Serializable {
	public static final long serialVersionUID = 2L;
	String name;
	String kind;
	public Pet(String name, String kind) {
		super();
		this.name = name;
		this.kind = kind;
	}
	@Override
	public String toString() {
		return "Pet [name=" + name + ", kind=" + kind + "]";
	}