Java 判断密码是否是大小写字母、数字、特殊字符中的至少三种public class CheckPassword {//数字public static final String REG_NUMBER = ".*\\d+.*";//小写字母public static final String REG_UPPERCASE = ".*[A-Z]+.*";//大写字母public static final String REG_LOWERCASE = ".*[a-z]+.*";//特殊符号public static final String REG_SYMBOL = ".*[~!@#$%^&*()_+|<>,.?/:;'\\[\\]{}\"]+.*";public static boolean checkPasswordRule(String password){//密码为空或者长度小于8位则返回falseif (password == null || password.length() <8 ) return false;int i = 0;if (password.matches(REG_NUMBER)) i++;if (password.matches(REG_LOWERCASE))i++;if (password.matches(REG_UPPERCASE)) i++;if (password.matches(REG_SYMBOL)) i++;if (i < 3 ) return false;return true;}