JAVA 读取文件编码格式兼容（获取）

	public static String codeString(String fileName) throws Exception {
		BufferedInputStream bin = new BufferedInputStream(new FileInputStream(fileName));
		int p = (bin.read() << 8) + bin.read();
		bin.close();
		String code = null;

		switch (p) {
			case 0xefbb:
				code = "UTF-8";
				break;
			case 0xfffe:
				code = "Unicode";
				break;
			case 0xfeff:
				code = "UTF-16BE";
				break;
			default:
				code = "GBK";
		}

		return code;
	}