ObjectStream

ObjectOutputStream

用于将属性和内容保存到文件中,保存数据类型和值,即序列化,该流为处理流

static和transient修饰的属性无法序列化,切被序列化的类必须实现Serializable接口,该类的属性中如果有类这个类也必须实现该接口.

package com.cn.file;

import org.junit.Test;

import java.io.*;

public class MyObjectStream {

    @Test
    public void test(){
        //序列化,将带属性的内容存入文件,必须实现Serializable
        // 接口的对象才能被写入
        String filePath="F:\\y\\file01.txt";
        ObjectOutputStream os =null;
        Dog dog1=new Dog(4,"哈哈");
        try {

             os=new ObjectOutputStream(new FileOutputStream(filePath));
             os.writeByte(10);
             os.writeChar('a');
             os.writeInt(100);
             os.writeUTF("改革春风abc");
             os.writeObject(dog1);
             os.writeObject(new Dog(6,"嘿嘿"));
            System.out.println("序列化完成");

        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            try {
                os.close();
                } catch (IOException e) {
                e.printStackTrace();
                                        }

        }

    }

}

ObjectInputStream

用于反序列化,将文件内容读取出来.

package com.cn.file;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.ObjectInputStream;

public class MyObjectStream2 {

    public static void main(String[] args) throws IOException, ClassNotFoundException {
        String filePath="F:\\y\\file01.txt";
        ObjectInputStream is=new ObjectInputStream(new FileInputStream(filePath));
      //反序列化时顺序要和写入顺序一致,不然乱码
        System.out.println(is.readByte());
        System.out.println(is.readChar());
        System.out.println(is.readInt());
        System.out.println(is.readUTF());
        Object dog=is.readObject();
        System.out.println(dog.getClass());
        System.out.println(dog.toString());
        is.close();

    }

}