字节流拷贝文件

public class  {
	 
	    public static void main(String[] args) {
	        File f_s = new File("d:\2.txt"); 
	        File f_d = new File("e:/yxm"); // 要拷贝到的路径
	        if (!f_d.exists()) { // 判断要拷贝到的路径是否存在，不存在就创建
	            f_d.mkdirs();
	 
	        }
	        File f_dd = new File(f_d, "7s.txt");
	        FileInputStream fis = null;
	        FileOutputStream fos = null;
	        try {
	            fis = new FileInputStream(f_s);
	            fos = new FileOutputStream(f_dd);
	            byte[] byteTemp = new byte[1024];
	            while(fis.read(byteTemp) != -1){
	                int size =byteTemp.length;
	                fos.write(byteTemp,0,size);
	                 
	            }
	        } catch (FileNotFoundException e) {
	            e.printStackTrace();
	        } catch (IOException e) {
	            e.printStackTrace();
	        } 
	        finally {
	            try {
	                if (fis != null) {
	                    fos.close();
	 
	                }
	                if (fos != null) {
	                    fis.close();
	 
	                }
	            } catch (IOException e) {
	                e.printStackTrace();
	            }
	        }
	    }
	}