ObjectInputStream與ObjectOutputStream使用以及與DataInputStream,DataOutput區別

結論

1.Object相當於裝IO流的一個盒子,我們可以把物件比作一個個拼好的積木,IO流就是拼積木的積木塊,那麼如果要搬走積木(物件),肯定需要把積木(物件)先拆了,再扔進盒子(Object)裡,這就是為什麼物件要序列化(Serializable)

2.當然裝的時候我們可以有兩種裝法一種是全放入(output.writeObject(this))第一種盒子(ObjectInputStream)另一種是分類別 (如:,比如屋頂,地板,這就是流裡面的) 放入(output.writeUTF(number),output.writeUTF(name),output.writeInt(age)…)

#### 演示程式碼

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

public class Test {
        public static void main(String[] args) throws IOException, ClassNotFoundException {
        Member[] mebers= {new Member("iotest/4.txt","xiaohua",1),new
 
 Member("iotest/4.txt","xiaoming",3),new Member("iotest/4.txt","xiaofang",3)};
        for(Member b:mebers) {
            b.save();
        }
        System.out.println(Member.load("iotest/4.txt"));
    }
}


 class Member implements Serializable {
    private String dest;
    private  String name;
    private  int  age;

    /**
     * 
     * @param dest 寫出的文目的地
     * @param name使用者名稱
     * @param age使用者年齡
     */

    public Member(String dest,String name, int age) {
        super();
        this.dest=dest;
        this.name = name;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    @Override
    public String toString() {
        // TODO Auto-generated method stub
        return String.format("%s %d", name,age);
    }
    public  void save() throws FileNotFoundException, IOException {
        try (ObjectOutputStream output = new ObjectOutputStream(new FileOutputStream(dest))) {
            output.writeObject(this);
        }
    }

    /**
     * 
     * @param number src 讀入的原始檔夾
     * @return
     * @throws FileNotFoundException 檔案未發現異常
     * @throws IOException  io異常
     * @throws ClassNotFoundException  檔案目錄異常
     */
    public static Member load(String number) throws FileNotFoundException, IOException, ClassNotFoundException {
        Member m;//接收讀入的物件
        try (ObjectInputStream output = new ObjectInputStream(new FileInputStream(number))) {
            m=(Member)output.readObject();
        }
        return m;
    }

}