序列流对象

SequenceInputStream此对象实现了将多个流转化成一个流。此对像接收的是Enumeration对象，那么如何获取Enumeration对象呢？我们通过查找api，collections类中的enumeration方法返回的就是Enumeration对象，我们将多个流对象封装进集合中，最终传进SequenceInputStream对象中，通过操作SequenceInputStream对象来实现复制

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.SequenceInputStream;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;

public class IoDemo {
    public static void main(String[] args) throws IOException {
        ArrayList<InputStream> al = new ArrayList();
        al.add(new FileInputStream("e:/1.txt"));
        al.add(new FileInputStream("e:/2.txt"));
        al.add(new FileInputStream("e:/3.txt"));
        // 获取Enumeration对象
        Enumeration<InputStream> en = Collections.enumeration(al);
        SequenceInputStream sq = new SequenceInputStream(en);
        FileOutputStream fo = new FileOutputStream("e:/lishuai.txt");
        int len = 0;
        byte[] b = new byte[1024];
        while ((sq.read(b)) != -1) {
            fo.write(b, 0, len);
        }
        sq.close();
        fo.close();
    }
}

对象的持久保存，我们称为对象的序列化，从持久设备上把对象读取到内存中称为对象的反序列化。ObjectOutputStream对象就是把内存中的一个对象，写到硬盘上，或者是把对象通过网络传递到网络的另外一端。

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.io.Serializable;

class People implements Serializable {
    private int age;
    private String name;

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

    public int getAge() {
        return age;
    }

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

    @Override
    public String toString() {
        return "People [age=" + age + ", name=" + name + "]";
    }

    public String getName() {
        return name;
    }

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

}

public class IoDemo {
    public static void main(String[] args) throws IOException {
        ObjectOutputStream ooa = new ObjectOutputStream(new FileOutputStream("e:/lishuai.txt"));
        People p = new People(24, "lishuai");
        ooa.writeObject(p);
        ooa.close();
    }
}