对文件的切割和合并

package com.huyd.day20;


import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.SequenceInputStream;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.Iterator;


public class SplitFilter {
public static void main(String[] args) {
File f=new File("1.jpg");
//toSplit(f);
magr();
}
public static void magr(){
ArrayList<FileInputStream> list=new ArrayList<FileInputStream>();
for(int i=1;i<10;i++){
try {
list.add(new FileInputStream("count"+i+".part"));
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
final Iterator<FileInputStream> it=list.iterator();

Enumeration<FileInputStream> en=new Enumeration<FileInputStream>(){
@Override
public boolean hasMoreElements() {
return it.hasNext();
}
@Override
public FileInputStream nextElement() {
return it.next();
}
};
SequenceInputStream sis=new SequenceInputStream(en);
FileOutputStream fos=null;
try {
fos=new FileOutputStream("new.jpg");
} catch (FileNotFoundException e1) {
e1.printStackTrace();
}
byte [] b=new byte[1024];
int i=0;
try {
while((i=sis.read(b))!=0){
fos.write(b, 0, i);
}
} catch (Exception e) {
}



}
public static void toSplit(File f){
try {
FileInputStream fos=new FileInputStream(f);
FileOutputStream fs=null;
byte [] b=new byte[1024*10];
int i=0;
int count=1;
try{
while((i=fos.read(b))!=-1){
fs=new FileOutputStream("count"+(count++)+".part");
fs.write(b, 0, i);
fs.close();
}
}catch (IOException e) {

}





} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}


}