黑马程序员_IO流——切割文件split

import java.io.*;
import java.util.*;

class SplitFile
{
public static void main(String[] args) throws IOException
{
//splitFile();
merge();
}

public static void merge()throws IOException
{
ArrayList<FileInputStream> al = new ArrayList<FileInputStream>();

for(int x=1; x<=3; x++)
{
al.add(new FileInputStream("c:\\splitfiles\\"+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("c:\\splitfiles\\0.bmp");

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("c:\\1.bmp");

FileOutputStream fos = null;

byte[] buf = new byte[1024*1024];

int len = 0;
int count = 1;
while((len=fis.read(buf))!=-1)
{
fos = new FileOutputStream("c:\\splitfiles\\"+(count++)+".part");
fos.write(buf,0,len);
fos.close();
}

fis.close();

}
}