字节流复制一个图片

1.用字节流读取对象和图片关联

2.用字节流写入流对象,创建一个图片文件.

3.通过循环读写,完成数据存储.

4.关闭资源

 

实例代码:

import java.io.*;
class CopyPic 
{
    public static void main(String[] args) 
    {
        FileOutputStream fos = null;
        FileInputStream fis = null;

        try
        {
            fos = new FileOutputStream("c:\\2.jpg");
            fis = new FileInputStream("c:\\1.jpg");

            byte[] buf  = new byte[1024];
            int len = 0;
            while((len = fis.read(buf)) != -1){
                fos.write(buf, 0 , len);
            }


        }
        catch (IOException e)
        {
            throw new RuntimeException("failed!");
        }
        finally{
            try
            {
                if(fis !=null)
                    fis.close();
            }
            catch (IOException e)
            {
                throw new RuntimeException("read failed!");
            }

            try
            {
                if(fos !=null)
                    fos.close();
            }
            catch (IOException e)
            {
                throw new RuntimeException("write failed!");
            }
        }
    }
}