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stringutil.join

tag = StringUtil.returnValidStr(((Element) element_list.get(i)).getAttribute...NOT IN会多次扫描表,使用EXISTS、NOT EXISTS ,IN , LEFT OUTER JOIN 来替代...

示例: public static void main(String[] args){ //abc System.out.println(StringUtils.join("a", "b", "c")); //a-b-c Object[] objects = { "a", "b", "c" }; System.out.println(StringUtils.join(objects, "-")); }输出: abca-b-c

示例: public static void main(String[] args){ System.out.println(StringUtils.join("f", "e", "i", "l", "o", "n", "g"));}输出: feilong

String[] s = null; //StringUtils.join(s)会报空指针异常String[] s = {}; //StringUtils.join(s)不会报错

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