public void demo1() {
		try {
			File dir = new File("d:\\abc\\bcd");
			if (!dir.exists()) {
				dir.mkdirs();
			}
			File file = new File(dir, "demo.txt");
			if (!file.exists()) {
				file.createNewFile();
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
 
	
	public void demo2() {
		File file = new File("c:\\1\\2\\3\\demo.txt");
		File dir = file.getParentFile();
		if (!dir.exists()) {
			dir.mkdirs();
		}
		try {
			file.createNewFile();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}