Created
June 21, 2017 12:47
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Random String Generator
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| /* | |
| * Copyright (c) 2017 Andres Jaimes http://andres.jaimes.net | |
| * | |
| * Permission is hereby granted, free of charge, to any person obtaining a copy | |
| * of this software and associated documentation files (the "Software"), to deal | |
| * in the Software without restriction, including without limitation the rights | |
| * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
| * copies of the Software, and to permit persons to whom the Software is | |
| * furnished to do so, subject to the following conditions: | |
| * | |
| * The above copyright notice and this permission notice shall be included in all | |
| * copies or substantial portions of the Software. | |
| * | |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
| * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
| * SOFTWARE. | |
| */ | |
| public class RandomStringGenerator { | |
| private static final String UPPER_CASE = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; | |
| private static final String LOWER_CASE = "abcdefghijklmnopqrstuvwxyz"; | |
| private static final String NUMBERS = "0123456789"; | |
| private static final String SPECIAL = "!@#$%&+-*/^"; | |
| private static final SecureRandom RAND = new SecureRandom(); | |
| private RandomStringGenerator() {} | |
| public static String random(int length, boolean lowercase, boolean uppercase, | |
| boolean numbers, boolean special) { | |
| StringBuilder sb = new StringBuilder(length); | |
| String source = ""; | |
| if (uppercase) source += UPPER_CASE; | |
| if (lowercase) source += LOWER_CASE; | |
| if (numbers) source += NUMBERS; | |
| if (special) source += SPECIAL; | |
| for(int i = 0; i < length; i++) { | |
| sb.append(source.charAt(RAND.nextInt(source.length()))); | |
| } | |
| return sb.toString(); | |
| } | |
| } |
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