/* 判断是否为数字 */ public static boolean isNumeric(String str) { if(str == null || str.isEmpty()){ return false; } Pattern pattern = Pattern.compile("[0-9]*"); Matcher isNum = pattern.matcher(str); if (!isNum.matches()) { return false; } return true; } /* 判断是否为数字或字母 */ public static boolean isNumOrLetter(String str) { Pattern pattern = Pattern.compile("^[a-zA-Z0-9]+$"); Matcher isRight = pattern.matcher(str); if (!isRight.matches()) { return false; } return true; } /* 判断是否有字母 */ public static boolean isLetter(String str) { Pattern pattern = Pattern.compile(".*[a-zA-Z]+.*"); Matcher islett = pattern.matcher(str); if (!islett.matches()) { return false; } return true; } /* 判断是否为+号数字或字母 */ public static boolean isPlusNumOrLetter(String str) { Pattern pattern = Pattern.compile("^\\+?[a-zA-Z0-9]+$"); ///^\+?[0-9a-zA-Z]+$/ Matcher isRight = pattern.matcher(str); if (!isRight.matches()) { return false; } return true; }