copyfile

public static void copyFile(String f1, String f2) throws IOException {
  	File sourceFile = new File(f1);
		File targetFile = new File(f2);
		BufferedInputStream inBuff = null;
		BufferedOutputStream outBuff = null;
		try {
			// 新建文件输入流并对它进行缓冲
			inBuff = new BufferedInputStream(new FileInputStream(sourceFile));
			// 新建文件输出流并对它进行缓冲
			outBuff = new BufferedOutputStream(new FileOutputStream(targetFile));
			// 缓冲数组
			byte[] b = new byte[1024 * 5];
			int len;
			while ((len = inBuff.read(b)) != -1) {
				outBuff.write(b, 0, len);
			}
			// 刷新此缓冲的输出流
			outBuff.flush();
		} finally {
			// 关闭流
			if (inBuff != null)
				inBuff.close();
			if (outBuff != null)
				outBuff.close();
		}
	}