import java.io.*;import java.util.*;public class io {    public static void main(String[] args)throws IOException    {         splitFile();        merge();    }        //切割文件    public static void splitFile() throws IOException    {        FileInputStream fis = new FileInputStream("e:\\4.jpg");        FileOutputStream fos = null;                byte[] buf = new byte[1024*1024];        int len = 0;        int count = 1;        while ((len=fis.read(buf))!=-1)        {            fos = new FileOutputStream("e:\\"+(count++)+".part");            fos.write(buf,0,len);            fos.close();        }        fis.close();    }        //合并文件    public static void merge() throws IOException    {        Vector<FileInputStream> v = new Vector<FileInputStream>();                v.add(new FileInputStream("e:\\1.txt"));        v.add(new FileInputStream("e:\\2.txt"));        v.add(new FileInputStream("e:\\3.txt"));                Enumeration<FileInputStream> en = v.elements();        SequenceInputStream sis = new SequenceInputStream(en);        FileOutputStream fos = new FileOutputStream("e:\\4.txt");                byte[] buf = new byte[1024];        int len = 0;        while ((len=sis.read(buf))!=-1)         {            fos.write(buf,0,len);            }        fos.close();        sis.close();            }}