java实现的密码强度检测功能完整示例

程序员文章站 2022-06-20 20:30:54

本文实例讲述了java实现的密码强度检测功能。分享给大家供大家参考，具体如下： checkstrength.java文件： package com.wx.pwd...

本文实例讲述了java实现的密码强度检测功能。分享给大家供大家参考，具体如下：

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：