[Java] Password generation (Pasay)

Use Pasay, which is a password policy enforcement library. Passwords can be generated using configurable rulesets.

Settings for using Pasay in Maven projects

pom.xml

<dependency>
    <groupId>org.passay</groupId>
    <artifactId>passay</artifactId>
    <version>1.6.0</version>
</dependency>

Code to generate a mixed case alphanumeric 8-digit password

Password.java

public class Password {

    public static String generate() {
        List<CharacterRule> rules = Arrays.asList(
                  new CharacterRule(EnglishCharacterData.UpperCase, 1),
                  new CharacterRule(EnglishCharacterData.LowerCase, 1),
                  new CharacterRule(EnglishCharacterData.Digit, 1)
            );
        PasswordGenerator generator = new PasswordGenerator();
        String password = generator.generatePassword(8, rules);
        return password;
    }
}

Test code

PasswordTest.java

public class PasswordTest {

    @Test
    public void testGenerate() {
        String password = Password.generate();
        assertTrue(password.length() == 8);
        assertTrue(password.matches(".*[a-z].*"));
        assertTrue(password.matches(".*[0-9].*"));
        assertTrue(password.matches(".*[A-Z].*"));
    }
}