以IO流的方式，复制图片

public class Seventh {
    public static void main(String[] args) {
        FileInputStream fis = null;
        FileOutputStream fos = null;
        try{
            fis = new FileInputStream("D:\\heima\\psb.jpg");
            fos = new FileOutputStream("F:\\luoli.jpg");

            byte[] bytes = new byte[1024];
            int len;

            while ((len = fis.read(bytes)) != -1){
                fos.write(bytes,0,len);
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            if(fis != null){
                try{
                    fis.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if(fos != null){
                try{
                    fos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

    }
}