Question

我的法典

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

public class ObjectStreamExample {

    /**
     * @param args
     */
    public static void main(String[] args) {

        Person person = new Person();
        person.setFirstName("Abhishek");
        person.setLastName("Choudhary");
        person.setAge(25);
        person.setHouseNum(256);
        ObjectOutputStream stream = null;
        try {
            stream = new ObjectOutputStream(new FileOutputStream(new File("Serialize.txt")));
            stream.writeUTF(person.toString());
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {

            e.printStackTrace();
        }finally{
            if(stream != null)
                try {
                    stream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
        }

        ObjectInputStream input = null;

        try {
            input = new ObjectInputStream(new FileInputStream(new File("Serialize.txt")));

            Person person2 = (Person) input.readObject();
            System.out.println(person2.getFirstName());
            System.out.println(person2.getLastName());
            System.out.println(person2.getAge());
            System.out.println(person2.getHouseNum());
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }finally{
            if(input != null)
                try {
                    input.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
        }


    }

}

一个人是案卷。

我成为例外。

java.io.OptionalDataException at java.io.ObjectInputStream.readObject0(Unknown Source) at java.io.ObjectInputStream.readObject(Unknown Source) at com.practise.interview.nio.ObjectStreamExample.main(ObjectStreamExample.java:62)

这是因为我认为——

An attempt was made to read an object when the next element in the stream is primitive data. In this case, the OptionalDataException s length field is set to the number of bytes of primitive data immediately readable from the stream, and the eof field is set to false.

但是,如果我知道,如何避免这种做法,那么,那是避免的。

Answer 1

页: 1 这并不是序列化是如何运作的。在序列化方面,UTF的扼杀被认为是原始数据,因为其中不包括物体信息(类别名称、属性等),而只包括插图数据。

www.un.org/Depts/DGACM/index_french.htm 如果你希望读到<代码>Person,那么:

stream.writeObject(person);

<><>> 如果书写<代码>String,则与任何其他Object一样,请上ClassCastException,因为String不能上Person/code>。无论如何,你所写的内容与你所读内容之间的不匹配造成了你所发现的错误。

Answer 2

具体化

表示物体由于原始数据无法读取,或者在流中属于序列化物体的数据终结而未能读到运行的情况除外。这一例外可分为两例:

An attempt was made to read an object when the next element in the stream is primitive data. In this case, the OptionalDataException s length field is set to the number of bytes of primitive data immediately readable from the stream, and the eof field is set to false.
An attempt was made to read past the end of data consumable by a class-defined readObject or readExternal method. In this case, the OptionalDataException s eof field is set to true, and the length field is set to 0.

stream.writeUTF(person.toString()); // Problem is here

Here you are write as UTF and in other end You are reading as a Person Object. You should change it -

stream.writeObject(person);

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