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本篇文章给大家分享的是有关java中怎么实现一个密码强度检测功能，小编觉得挺实用的，因此分享给大家学习，希望大家阅读完这篇文章后可以有所收获，话不多说，跟着小编一起来看看吧。
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CheckStrength.java文件：
package com.wx.pwd;/** * 检测密码强度 * * @author venshine */public class CheckStrength { public enum LEVEL { EASY, MIDIUM, STRONG, VERY_STRONG, EXTREMELY_STRONG } /** * NUM 数字 * SMALL_LETTER 小写字母 * CAPITAL_LETTER 大写字母 * OTHER_CHAR 特殊字符 */ private static final int NUM = 1; private static final int SMALL_LETTER = 2; private static final int CAPITAL_LETTER = 3; private static final int OTHER_CHAR = 4; /** * 简单的密码字典 */ private final static String[] DICTIONARY = {"password", "abc123", "iloveyou", "adobe123", "123123", "sunshine", "1314520", "a1b2c3", "123qwe", "aaa111", "qweasd", "admin", "passwd"}; /** *检查字符类型，包括num、大写字母、小写字母和其他字符。 * * @param c * @return */ private static int checkCharacterType(char c) { if (c >= 48 && c <= 57) { return NUM; } if (c >= 65 && c <= 90) { return CAPITAL_LETTER; } if (c >= 97 && c <= 122) { return SMALL_LETTER; } return OTHER_CHAR; } /** * 按不同类型计算密码的数量 * * @param passwd * @param type * @return */ private static int countLetter(String passwd, int type) { int count = 0; if (null != passwd && passwd.length() > 0) { for (char c : passwd.toCharArray()) { if (checkCharacterType(c) == type) { count++; } } } return count; } /** * 检查密码的强度 * * @param passwd * @return strength level */ public static int checkPasswordStrength(String passwd) { if (StringUtils.equalsNull(passwd)) { throw new IllegalArgumentException("password is empty"); } int len = passwd.length(); int level = 0; // 增加点 //判断密码是否含有数字有level++ if (countLetter(passwd, NUM) > 0) { level++; } //判断密码是否含有小写字母有level++ if (countLetter(passwd, SMALL_LETTER) > 0) { level++; } //判断密码是否还有大写字母有level++ if (len > 4 && countLetter(passwd, CAPITAL_LETTER) > 0) { level++; } //判断密码是否还有特殊字符有level++ if (len > 6 && countLetter(passwd, OTHER_CHAR) > 0) { level++; } //密码长度大于4并且2种类型组合......（不一一概述） if (len > 4 && countLetter(passwd, NUM) > 0 && countLetter(passwd, SMALL_LETTER) > 0 || countLetter(passwd, NUM) > 0 && countLetter(passwd, CAPITAL_LETTER) > 0 || countLetter(passwd, NUM) > 0 && countLetter(passwd, OTHER_CHAR) > 0 || countLetter(passwd, SMALL_LETTER) > 0 && countLetter(passwd, CAPITAL_LETTER) > 0 || countLetter(passwd, SMALL_LETTER) > 0 && countLetter(passwd, OTHER_CHAR) > 0 || countLetter(passwd, CAPITAL_LETTER) > 0 && countLetter(passwd, OTHER_CHAR) > 0) { level++; } //密码长度大于6并且3中类型组合......（不一一概述） if (len > 6 && countLetter(passwd, NUM) > 0 && countLetter(passwd, SMALL_LETTER) > 0 && countLetter(passwd, CAPITAL_LETTER) > 0 || countLetter(passwd, NUM) > 0 && countLetter(passwd, SMALL_LETTER) > 0 && countLetter(passwd, OTHER_CHAR) > 0 || countLetter(passwd, NUM) > 0 && countLetter(passwd, CAPITAL_LETTER) > 0 && countLetter(passwd, OTHER_CHAR) > 0 || countLetter(passwd, SMALL_LETTER) > 0 && countLetter(passwd, CAPITAL_LETTER) > 0 && countLetter(passwd, OTHER_CHAR) > 0) { level++; } //密码长度大于8并且4种类型组合......（不一一概述） if (len > 8 && countLetter(passwd, NUM) > 0 && countLetter(passwd, SMALL_LETTER) > 0 && countLetter(passwd, CAPITAL_LETTER) > 0 && countLetter(passwd, OTHER_CHAR) > 0) { level++; } //密码长度大于6并且2种类型组合每种类型长度大于等于3或者2......（不一一概述） if (len > 6 && countLetter(passwd, NUM) >= 3 && countLetter(passwd, SMALL_LETTER) >= 3 || countLetter(passwd, NUM) >= 3 && countLetter(passwd, CAPITAL_LETTER) >= 3 || countLetter(passwd, NUM) >= 3 && countLetter(passwd, OTHER_CHAR) >= 2 || countLetter(passwd, SMALL_LETTER) >= 3 && countLetter(passwd, CAPITAL_LETTER) >= 3 || countLetter(passwd, SMALL_LETTER) >= 3 && countLetter(passwd, OTHER_CHAR) >= 2 || countLetter(passwd, CAPITAL_LETTER) >= 3 && countLetter(passwd, OTHER_CHAR) >= 2) { level++; } //密码长度大于8并且3种类型组合每种类型长度大于等于3或者2......（不一一概述） if (len > 8 && countLetter(passwd, NUM) >= 2 && countLetter(passwd, SMALL_LETTER) >= 2 && countLetter(passwd, CAPITAL_LETTER) >= 2 || countLetter(passwd, NUM) >= 2 && countLetter(passwd, SMALL_LETTER) >= 2 && countLetter(passwd, OTHER_CHAR) >= 2 || countLetter(passwd, NUM) >= 2 && countLetter(passwd, CAPITAL_LETTER) >= 2 && countLetter(passwd, OTHER_CHAR) >= 2 || countLetter(passwd, SMALL_LETTER) >= 2 && countLetter(passwd, CAPITAL_LETTER) >= 2 && countLetter(passwd, OTHER_CHAR) >= 2) { level++; } //密码长度大于10并且4种类型组合每种类型长度大于等于2......（不一一概述） if (len > 10 && countLetter(passwd, NUM) >= 2 && countLetter(passwd, SMALL_LETTER) >= 2 && countLetter(passwd, CAPITAL_LETTER) >= 2 && countLetter(passwd, OTHER_CHAR) >= 2) { level++; } //特殊字符>=3 level++; if (countLetter(passwd, OTHER_CHAR) >= 3) { level++; } //特殊字符>=6 level++; if (countLetter(passwd, OTHER_CHAR) >= 6) { level++; } //长度>12 >16 level++ if (len > 12) { level++; if (len >= 16) { level++; } } // 减少点 if ("abcdefghijklmnopqrstuvwxyz".indexOf(passwd) > 0 || "ABCDEFGHIJKLMNOPQRSTUVWXYZ".indexOf(passwd) > 0) { level--; } if ("qwertyuiop".indexOf(passwd) > 0 || "asdfghjkl".indexOf(passwd) > 0 || "zxcvbnm".indexOf(passwd) > 0) { level--; } if (StringUtils.isNumeric(passwd) && ("01234567890".indexOf(passwd) > 0 || "09876543210".indexOf(passwd) > 0)) { level--; } if (countLetter(passwd, NUM) == len || countLetter(passwd, SMALL_LETTER) == len || countLetter(passwd, CAPITAL_LETTER) == len) { level--; } if (len % 2 == 0) { // aaabbb String part1 = passwd.substring(0, len / 2); String part2 = passwd.substring(len / 2); if (part1.equals(part2)) { level--; } if (StringUtils.isCharEqual(part1) && StringUtils.isCharEqual(part2)) { level--; } } if (len % 3 == 0) { // ababab String part1 = passwd.substring(0, len / 3); String part2 = passwd.substring(len / 3, len / 3 * 2); String part3 = passwd.substring(len / 3 * 2); if (part1.equals(part2) && part2.equals(part3)) { level--; } } if (StringUtils.isNumeric(passwd) && len >= 6) { // 19881010 or 881010 int year = 0; if (len == 8 || len == 6) { year = Integer.parseInt(passwd.substring(0, len - 4)); } int size = StringUtils.sizeOfInt(year); int month = Integer.parseInt(passwd.substring(size, size + 2)); int day = Integer.parseInt(passwd.substring(size + 2, len)); if (year >= 1950 && year < 2050 && month >= 1 && month <= 12 && day >= 1 && day <= 31) { level--; } } if (null != DICTIONARY && DICTIONARY.length > 0) {// dictionary for (int i = 0; i < DICTIONARY.length; i++) { if (passwd.equals(DICTIONARY[i]) || DICTIONARY[i].indexOf(passwd) >= 0) { level--; break; } } } if (len <= 6) { level--; if (len <= 4) { level--; if (len <= 3) { level = 0; } } } if (StringUtils.isCharEqual(passwd)) { level = 0; } if (level < 0) { level = 0; } return level; } /** *获得密码强度等级，包括简单、复杂、强、强、强 * * @param passwd * @return */ public static LEVEL getPasswordLevel(String passwd) { int level = checkPasswordStrength(passwd); switch (level) { case 0: case 1: case 2: case 3: return LEVEL.EASY; case 4: case 5: case 6: return LEVEL.MIDIUM; case 7: case 8: case 9: return LEVEL.STRONG; case 10: case 11: case 12: return LEVEL.VERY_STRONG; default: return LEVEL.EXTREMELY_STRONG; } }}
StringUtils.java文件：
package com.wx.pwd;/** * 字符串工具类 * * @author venshine */public class StringUtils { private final static int[] SIZE_TABLE = {9, 99, 999, 9999, 99999, 999999, 9999999, 99999999, 999999999, Integer.MAX_VALUE}; /** * 计算一个整数的大小 * * @param x * @return */ public static int sizeOfInt(int x) { for (int i = 0; ; i++) if (x <= SIZE_TABLE[i]) { return i + 1; } } /** * 判断字符串的每个字符是否相等 * * @param str * @return */ public static boolean isCharEqual(String str) { return str.replace(str.charAt(0), ' ').trim().length() == 0; } /** * 确定字符串是否为数字 * * @param str * @return */ public static boolean isNumeric(String str) { for (int i = str.length(); --i >= 0; ) { if (!Character.isDigit(str.charAt(i))) { return false; } } return true; } /** * 判断字符串是否为空格、空(“)”或null。 * * @param str * @return */ public static boolean equalsNull(String str) { int strLen; if (str == null || (strLen = str.length()) == 0 || str.equalsIgnoreCase("null")) { return true; } for (int i = 0; i < strLen; i++) { if ((Character.isWhitespace(str.charAt(i)) == false)) { return false; } } return true; }}
CheckPWD.java文件：
package com.wx.pwd;public class CheckPWD { public static void main(String[] args) { String passwd = "myNameJOB123_-+="; System.out.println(CheckStrength.checkPasswordStrength(passwd)); System.out.println(CheckStrength.getPasswordLevel(passwd)); }}
运行结果：
13EXTREMELY_STRONG
以上就是java中怎么实现一个密码强度检测功能，小编相信有部分知识点可能是我们日常工作会见到或用到的。希望你能通过这篇文章学到更多知识。更多详情敬请关注创新互联行业资讯频道。