文件的切割流和合并流

最新推荐文章于 2023-12-07 08:52:10 发布

我叫阿狸猫

最新推荐文章于 2023-12-07 08:52:10 发布

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分类专栏： IO 文章标签： byte import vector 存储 string class

本文链接：https://blog.youkuaiyun.com/world_java/article/details/7551797

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//文件的切割流和合并流
import java.io.*;
import java.util.*;
class SplitDemo 
{
	public static void main(String[] args) throws IOException
	{
		method2();
	}
	public static void method2()throws IOException//此方法使用ArrayList存储FileInputStream对象,并使用Enumeration匿名内部类
	{
		ArrayList<FileInputStream>al=new ArrayList<FileInputStream>();
		for (int x=1;x<7 ;x++ )
		{
			al.add(new FileInputStream("F:"+File.separator+"haha"+File.separator+"part"+x+".part"));
		}
		final Iterator<FileInputStream>it=al.iterator();
		Enumeration<FileInputStream>e=new Enumeration<FileInputStream>()
		{
			public boolean hasMoreElements()
			{
				return it.hasNext();
			}
			public FileInputStream nextElement()
			{
				return it.next();
			}
		};
		SequenceInputStream sis=new SequenceInputStream(e);
		BufferedOutputStream bos=new BufferedOutputStream(new FileOutputStream("f:"+File.separator+"haha111.avi"));
		byte by[]=new byte[1024];
		int len=0;
		while ((len=sis.read(by))!=-1)
		{
			bos.write(by,0,len);
		}
		sis.close();
		bos.close();
	}
	public static void method1()throws IOException//此方法是用Vector集合存储FileInputStream 并使用Enumeration
	{
		Vector<FileInputStream>v=new Vector<FileInputStream>();
		for (int x=1;x<7 ;x++ )
		{
			v.add(new FileInputStream("F:"+File.separator+"haha"+File.separator+"part"+x+".part"));
		}
		Enumeration<FileInputStream>e=v.elements();
		SequenceInputStream sis=new SequenceInputStream(e);
		FileOutputStream fos=new FileOutputStream("f:"+File.separator+"haha.avi");
		byte by[]=new byte[1024];
		int len=0;
		while ((len=sis.read(by))!=-1)
		{
			fos.write(by,0,len);
		}
		sis.close();
		fos.close();
	}
	public static void method()throws IOException//此方法是切割文件
	{
		FileInputStream fis=new FileInputStream("2012世界末日.avi");
		FileOutputStream fos=null;
		byte by[]=new byte[1024*1024];
		int len=0;
		int count=1;
		while ((len=fis.read(by))!=-1)
		{
			fos=new FileOutputStream("f:"+File.separator+"haha"+File.separator+"part"+(count++)+".part");
			fos.write(by,0,len);
			fos.close();
		}
		fis.close();
	}
}