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=1024M1M=1024KB1KB=1024Bint 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();}}