java对象序列化readObject/defaultReadObject

Question

什么之间的区别readObject,并defaultReadObject在ObjectInputStream上课吗？我似乎无法找到关于差异的非常多的信息.

Answer 1

defaultReadObject()调用默认的反序列化机制,并在您readObject()在Serializable类上定义方法时使用.换句话说,当您具有自定义反序列化逻辑时,您仍然可以返回到默认序列化,这将反序列化非静态非瞬态字段.例如:

public class SomeClass implements Serializable {
    private String fld1;
    private int fld2;
    private transient String fld3; 
    private void readObject(java.io.ObjectInputStream stream)
         throws IOException, ClassNotFoundException {
         stream.defaultReadObject(); //fills fld1 and fld2;
         fld3 = Configuration.getFooConfigValue();
    }
]

另一方面,从反序列化对象外部readObject()创建ObjectInputStream,并且想要读取先前序列化的对象时使用:

ObojectInputStream stream = new ObjectInputStream(aStreamWithASerializedObject);
Object foo = (Foo) stream.readObject();