Java基础之IO流，通过字节流对媒体文件进行复制操作

import java.io.*;

class ImageCopyDemo
{
    public static void main(String[] args)
    {
        FileInputStream fis = null;
        FileOutputStream fos = null;
    
        try
        {
            fis = new FileInputStream(new File("001.png"));
            fos = new FileOutputStream(new File("001-copy.png"));
            
            /*
            byte[] buffer = new byte[fis.available()];
            fis.read(buffer);            
            fos.write(buffer);
            */
            
            //最折中的方法
            byte[] buffer = new byte[1024];
            int length = 0;
            while((length=fis.read(buffer))!=-1)
            {
                fos.write(buffer);
            }        
            
            /*
            int ch = 0;
            while((ch=fis.read())!=-1)
            {
                fos.write(ch);
            }
            */
        }
        catch(IOException e)
        {
            System.out.println(e.getMessage());
        }
        finally
        {
            try
            {
                if(null!=fis)
                    fis.close();
                if(null!=fos)
                    fos.close();
            }
            catch(IOException e)
            {
                System.out.println(e.getMessage());
            }
        }
    }
}