Method get

APIJSONORM/src/main/java/apijson/StringUtil.java:80–82

获取string,为null则返回"" @param obj @return

(Object obj)

	 * @return
	 */
	public static String get(Object obj) {
		return obj == null ? "" : obj.toString();
	}
	/**获取string,为null则返回""
	 * @param s
	 * @return