day20/SplitFile.java

import java.io.*;
import java.util.*;
class SplitFile 
{
	public static void main(String[] args) throws IOException
	{
		//splitFile();
		merge();
	}
	public static void merge()throws IOException
	{
		/*
		Vector<FileInputStream> v = new Vector<FileInputStream>();
		for(int x=1;x<=4;x++)
		{
			v.add(new FileInputStream("e:\\javademo\\day20\\SplitFiles\\"+x+".part"));
		}
		Enumeration<FileInputStream> en = v.elements();
		SequenceInputStream sis = new SequenceInputStream(en);
		*/
		
		ArrayList<FileInputStream> al = new ArrayList<FileInputStream>();
		for(int x=1;x<=4;x++)
		{
			al.add(new FileInputStream("e:\\javademo\\day20\\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("e:\\javademo\\day20\\SplitFiles\\2.bmp");

		byte[] buf = new byte[1024];
		int len=0;
		while((len=sis.read(buf))!=-1)
		{
			fos.write(buf,0,len);
		}
		sis.close();
		fos.close();
	}
	
	public static void splitFile() throws IOException
	{
		FileInputStream fis = new FileInputStream("e:\\javademo\\day20\\SplitFiles\\1.bmp");

		FileOutputStream fos = null;
		
		byte[] buf = new byte[1024*1024];//1M		//1G=1024M		1M=1024KB	1KB=1024B
		int len=0;
		int count=1;
		while((len=fis.read(buf))!=-1)
		{
			fos=new FileOutputStream("e:\\javademo\\day20\\SplitFiles\\"+(count++)+".part");
			fos.write(buf,0,len);
			fos.close();
		}
		fis.close();
	}
}