IO练习(拆分和组合一个文件)

import java.io.*;
import java.util.*;
class SplitFile 
{
    public static void main(String[] args) throws IOException
    {
        splitFile(); //切割
        merge();  //缝合
    }
    
    public static void merge() throws IOException
    {
        ArrayList<FileInputStream> al = new ArrayList<FileInputStream>();
        for (int x=1; x<=3; x++)
        {
            al.add(new FileInputStream("E:\\Ziliao\\Java\\practice\\day_one\\"+x+".part"));
        }
        final Iterator<FileInputStream> it = al.iterator();

        Enumeration<FileInputStream> en = new Enumeration<FileInputStream>()
        {
            public boolean hasMoreElements()
            {
                return it.hasNext();
            }
            public FileInputStream nextElement()
            {
                return it.next();
            }
        };
        SequenceInputStream  sis = new SequenceInputStream(en);
        FileOutputStream fos = new FileOutputStream("E:\\Ziliao\\Java\\practice\\repear.jpg");
        byte[] buf = new byte[1024];
        int len =0;

        while ((len=sis.read(buf))!=-1)
        {
            fos.write(buf,0,len);
        }
        fos.close();
        sis.close();
    }
    public static void splitFile() throws IOException
    {
        FileInputStream fis = new FileInputStream("E:\\Ziliao\\Java\\practice\\1.jpg");
        FileOutputStream fos = null;

        byte[] buf = new byte[800*800];
        int len = 0;
        int count =1;
        while ((len=fis.read(buf))!=-1)
        {
            fos = new FileOutputStream("E:\\Ziliao\\Java\\practice\\day_one\\"+(count++)+".part");
            fos.write(buf,0,len);
            fos.close();
        }
        fis.close();
    }
}