文件的切割和合并

package test;
 
 
import java.io.*;
import java.sql.SQLClientInfoException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.*;
import java.util.zip.InflaterInputStream;
 
import javax.annotation.processing.FilerException;
import javax.management.RuntimeErrorException;

import privateclass.Filterby_Name;
import privateclass.Filterby_hidden;
import privateclass.Filterby_java;
import privateclass.MyBufferedReader;
 
public class Main {
 
    private static final String space_operator = " ";
    private static final double pi = Math.PI;
    private static final String LINE_SEPARATOR = System.getProperty("line.separator");
	private static final int SIZE = 1024*1024;
    public static void main(String[] args) throws Exception {
 
    	
    	File file = new File("D:\\1.png");
    	File file2 = new File("d:\\图片分割");
    	//cutting(file);
    	mergepart(file2);
    	
    	
    }
	/**
           *文件切割
     * @throws IOException 
     */
	public static void cutting(File file) throws IOException {
		FileInputStream fis = new FileInputStream(file);
		byte buf[] = new byte[SIZE];
		int len = 0;
		int count = 1;
		FileOutputStream fos = null;
		File dirFile = new File("d:\\图片分割");
		if(!dirFile.exists())dirFile.mkdirs();
		while((len = fis.read(buf)) != -1)
		{
			fos = new FileOutputStream(new File(dirFile,(count++) + ".part"));
			fos.write(buf, 0, len);
		}
		fis.close();
		fos.close();
	}
   
	public static void mergepart(File file2) throws IOException {
		List<FileInputStream> list = new ArrayList<FileInputStream>();
		for(int i = 1; i <= file2.listFiles().length; i ++)
		{
			list.add(new FileInputStream(new File(file2,i + ".part")));
		}
		
		Enumeration<FileInputStream> en = Collections.enumeration(list);
		SequenceInputStream sis = new SequenceInputStream(en);
		FileOutputStream fos = new FileOutputStream(new File(file2,"1.png"));
		byte buf [] = new byte[SIZE];
		int len = 0;
		while((len = sis.read(buf)) != -1)
		{
			fos.write(buf,0,len);
		}
		sis.close();
		fos.close();
		
	}
}