标签：字节流   黑马程序员   java基础   文档   

文件的切割与合并

import java.io.BufferedInputStream;
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.InputStream;
import java.io.SequenceInputStream;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.Vector;

public class FileSplieDemos {

	public static void main(String[] args) throws Exception 
	{
		File theReadPath = new File("C:\\Users\\Administrator\\Desktop\\测试文件夹\\凤舞九天.mp3");
		String  theOutPath ="C:\\Users\\Administrator\\Desktop\\测试文件夹\\abc\\";
		// 调用自定义方法将一个图片文件进行切割
		SplieFile(theReadPath,theOutPath,new File(".mp3"));
		//调用自定义方法将这些被分割的文件合并起
		String theMergerpathout = "C:\\Users\\Administrator\\Desktop\\测试文件夹\\abCOPY\\";
		String themergerInputpath="C:\\Users\\Administrator\\Desktop\\测试文件夹\\abc\\";
		String theoutformat = "MergerCopy.mp3";
		MergerFile(themergerInputpath,theMergerpathout,theoutformat);
	}

	

	private static void MergerFile(String themergerInputpath,
			String theMergerpathout, String theoutformat) throws Exception {
		// TODO Auto-generated method stub
		File fil = new File(theMergerpathout);
		if(!(fil.isDirectory()))
		{
			fil.mkdirs();
		}
		//将文件来源封装对象
		File file = new File(themergerInputpath);
		//获取所有块片的文件
		File[] names = file.listFiles();
		//创建一个容器，将所有的文件名字储存
		Vector<FileInputStream> v = new Vector<FileInputStream>();
		for(int x=0;x<names.length;x++)
		{
			v.add(new FileInputStream(names[x]));
		}
		Enumeration<FileInputStream> en = v.elements();
		//合并多个流对象
		SequenceInputStream sis = new SequenceInputStream(en);
		//创建输出流对象
		BufferedOutputStream bos = 
				new BufferedOutputStream(new FileOutputStream(theMergerpathout+theoutformat));
		int len = 0;
		byte[] b = new byte[1024*1024];
		while((len=sis.read(b))!=-1)
		{
			bos.write(b);
			bos.flush();
		}
	}

	private static void SplieFile(File file,String thepath,File format)
	{
		// 通过字节流并联需要切割的文件对象,并加入缓冲技术提高效率
		System.out.println("切割文件功能启动");
		File fil = new File(thepath);
		if(!(fil.isDirectory()))
		{
			fil.mkdirs();
		}
		BufferedInputStream bis = null;
		BufferedOutputStream bos = null;
		int number = 0;

			try {
				bis = new BufferedInputStream(new FileInputStream(file));
				//初使化输出路径
				
				byte[] b = new byte[1024*1024];
			    int len  = 0;
			    while((len = bis.read(b))!=-1)
			    {
			    	number++;
			    	bos = new BufferedOutputStream(new FileOutputStream(thepath+number+format));
			    	bos.write(b);
			    	bos.flush();
			    	
			    }
			} catch (FileNotFoundException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		
		
		
	}
}

黑马程序员——java——文件的切割与合并

标签：字节流   黑马程序员   java基础   文档   

原文地址：http://blog.csdn.net/zl18603543572/article/details/46592937