java实现的密码强度检测功能完整示例

网友投稿 610 2023-01-04


java实现的密码强度检测功能完整示例

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(pashttp://swd, CAPITAL_LETTER) >= 3 && countLetter(passwd, OTHER_CHAR) >= 2) {

levelRHOPdOlhN++;

}

//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(passwdRHOPdOlhN, 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--;

}

http:// 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:

13

EXTREMELY_STRONG

PS:这里再为大家提供两款功能类似的在线工具供大家参考:

密码安全性在线检测:

http://tools.jb51.net/password/my_password_safe

高强度密码生成器:

http://tools.jb51.net/password/CreateStrongPassword

在线随机数字/字符串生成工具:

http://tools.jb51.net/aideddesign/suijishu

更多关于java算法相关内容感兴趣的读者可查看本站专题:《Java数据结构与算法教程》、《Java字符与字符串操作技巧总结》、《Java操作DOM节点技巧总结》、《Java文件与目录操作技巧汇总》和《Java缓存操作技巧汇总》

希望本文所述对大家java程序设计有所帮助。


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