Java生成主键id

private static String getUUID() {
		// 自动生成主键,例如550E8400-E29B-11D4-A716-446655440000
		String id = UUID.randomUUID().toString();
		String replaceAll = id.replaceAll("-", "");
        //550E8400E29B11D4A716446655440000
		return replaceAll;
	}