package com.java;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.List;

import java.util.Random;

/**

* 描述：动态自动生成随机复杂密码

* @Author: mzy

* @Date: 2019-8-20 11:15

*/

public class PasswordGenerator {public static final char[] allowedSpecialCharactors = {

'`', '~', '@', '#', '$', '%', '^', '&',

'*', '(', ')', '-', '_', '=', '+', '[',

'{', '}', ']', '\\', '|', ';', ':', '"',

'\'', ',', '<', '.', '>', '/', '?'};//密码能包含的特殊字符

private static final int letterRange = 26;

private static final int numberRange = 10;

private static final int spCharactorRange = allowedSpecialCharactors.length;

private static final Random random = new Random();

private int passwordLength;//密码的长度

private int minVariousType;//密码包含字符的最少种类

public PasswordGenerator(int passwordLength, int minVariousType) {

if (minVariousType > CharactorType.values().length) minVariousType = CharactorType.values().length;

if (minVariousType > passwordLength) minVariousType = passwordLength;

this.passwordLength = passwordLength;

this.minVariousType = minVariousType;

}

public String generateRandomPassword() {

char[] password = new char[passwordLength];

List<Integer> pwCharsIndex = new ArrayList();

for (int i = 0; i < password.length; i++) {

pwCharsIndex.add(i);

}

List<CharactorType> takeTypes = new ArrayList(Arrays.asList(CharactorType.values()));

List<CharactorType> fixedTypes = Arrays.asList(CharactorType.values());

int typeCount = 0;

while (pwCharsIndex.size() > 0) {

int pwIndex = pwCharsIndex.remove(random.nextInt(pwCharsIndex.size()));//随机填充一位密码

Character c;

if (typeCount < minVariousType) {//生成不同种类字符

c = generateCharacter(takeTypes.remove(random.nextInt(takeTypes.size())));

typeCount++;

} else {//随机生成所有种类密码

c = generateCharacter(fixedTypes.get(random.nextInt(fixedTypes.size())));

}

password[pwIndex] = c.charValue();

}

return String.valueOf(password);

}

private Character generateCharacter(CharactorType type) {

Character c = null;

int rand;

switch (type) {

case LOWERCASE://随机小写字母

rand = random.nextInt(letterRange);

rand += 97;

c = new Character((char) rand);

break;

case UPPERCASE://随机大写字母

rand = random.nextInt(letterRange);

rand += 65;

c = new Character((char) rand);

break;

case NUMBER://随机数字

rand = random.nextInt(numberRange);

rand += 48;

c = new Character((char) rand);

break;

case SPECIAL_CHARACTOR://随机特殊字符

rand = random.nextInt(spCharactorRange);

c = new Character(allowedSpecialCharactors[rand]);

break;

}

return c;

}

public static void main(String[] args) {

System.out.println(new PasswordGenerator(10, 3).generateRandomPassword());

}

}

enum CharactorType {

LOWERCASE,

UPPERCASE,

NUMBER,

SPECIAL_CHARACTOR

}