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Javaで仮パスワードとかを作るときはcommons-langのRandomStringUtilsが便利

Last updated at Posted at 2016-04-20

はじめに

仕事で仮パスワードを発行する仕組みを作成しているので、
なんか適当なライブラリが無いか調べたのでまとめる。

使い方

commons-langをmavenなりgradleなりで通す。

pom.xml
<dependency>
	<groupId>org.apache.commons</groupId>
	<artifactId>commons-lang3</artifactId>
	<version>3.4</version>
</dependency>

サンプル

RandomStringTest.java
import org.apache.commons.lang3.RandomStringUtils;

public class RandomStringTest {

	public static void main(String[] args) {

		// アルファベット16桁
		System.out.println(RandomStringUtils.randomAlphabetic(16));
		// アスキー16桁
		System.out.println(RandomStringUtils.randomAscii(16));
		// 数字16桁
		System.out.println(RandomStringUtils.randomNumeric(16));
		// アルファベットと数字16桁
		System.out.println(RandomStringUtils.randomAlphanumeric(16));
		// 自分で設定した文字列からランダム16桁
		System.out.println(RandomStringUtils.random(16, "abcdefg"));

	}
}
実行結果
HXJcdIiVFbIUwvIe
}RPuODdHc%)BR[k'
8391904488624867
MVhTqGAzdf00kG2C
acefeaeeeadgcagg

すごく簡単。

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