分割流 SequenceInputStream (轉)

標籤：java   os   檔案   io   art   for   

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; //迴圈建立n個檔案
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"));
}
//匿名內部類，所以要對訪問的局部變數做final修飾
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();
}
}