黑马程序员——文件的切割，与合并

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package com.io.properties;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.SequenceInputStream;
import java.util.Enumeration;
import java.util.Vector;

public class SplitFile {
	public static void main(String[] args) {
		try {
			//split();
			heBing();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	/*
	 * 合并多个文件成一个文件
	 */
	public static void heBing() throws IOException{
		Vector<FileInputStream> v=new Vector<FileInputStream>();
		v.add(new FileInputStream("g:/java/1.part"));
		v.add(new FileInputStream("g:/java/2.part"));
		v.add(new FileInputStream("g:/java/3.part"));
		v.add(new FileInputStream("g:/java/4.part"));
		Enumeration<FileInputStream>en=v.elements();
		SequenceInputStream sis=new SequenceInputStream(en);
		int num=0;
		FileOutputStream fos=new FileOutputStream("g:/java/hebing.mp3");
		byte[]b=new byte[1024];
		while(-1!=(num=sis.read(b))){
			fos.write(b,0,num);
			fos.flush();
		}
		fos.close();
		sis.close();
	}
	
	/*
	 * 切割文件，把一个文件按指定大小进行切割，分割成多个文件
	 */
	public static void split() throws IOException{
		FileInputStream fis=new FileInputStream(new File("g:/java/a.mp3"));
		FileOutputStream fos=null;
		byte[]b=new byte[1024*1024*5];//大小是5M
		int num=0;
		int count=1;
		while(-1!=(num=fis.read(b))){
			fos=new FileOutputStream(new File("g:/java/"+ count++ +".part"));
			fos.write(b,0,num);
			fos.close();
		}
		fis.close();
	
	}
}

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