分割流 SequenceInputStream (转)

import java.io.*;
import java.util.*; class SplitFile
{
public static void main(String[] args) throws Exception
{
//splitFile();
merge();
} public static void splitFile()throws Exception{
FileInputStream fis = new FileInputStream("c:\1.mp3");
FileOutputStream fos = null;

byte[] buf = new byte[1024*1024]; int len = 0;
int count = 1; //循环创建n个文件
while((len = fis.read(buf)) != -1){
fos = new FileOutputStream("c:\splitfiles\"+ (count++) +".part"); fos.write(buf, 0, len);
fos.close();
}

fis.close(); }
//合并？
public static void merge() throws Exception{
ArrayList<FileInputStream> al = new ArrayList<FileInputStream>(); for(int x=1; x<=17;x++){
al.add(new FileInputStream("c:\splitfiles\"+x+".part"));
}
//匿名内部类，所以要对访问的局部变量做final修饰
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\1.mp3"); byte[] buf = new byte[1024]; int len = 0; while((len = sis.read(buf))!=-1){
fos.write(buf,0,len);
}
fos.close();
sis.close();
}
}