Java provides many ways to generate random strings.
1. Using Apache Commons
public void generatingRandomAlphanumericString_ApacheCommons() {
String generatedString = RandomStringUtils.randomAlphanumeric(10);
System.out.println(generatedString);
}
2. Using Java 8
public void generatingRandomAlphanumericString_Java8() {
int leftLimit = 48; // numeral '0'
int rightLimit = 122; // letter 'z'
int targetStringLength = 10;
Random random = new Random();
String generatedString = random.ints(leftLimit, rightLimit + 1)
.filter(i -> (i <= 57 || i >= 65) && (i <= 90 || i >= 97))
.limit(targetStringLength)
.collect(StringBuilder::new, StringBuilder::appendCodePoint, StringBuilder::append)
.toString();
System.out.println(generatedString);
}
3. Using Plain Java
public void generatingRandomStringUnbounded_PlainJava() {
byte[] array = new byte[7]; // length is bounded by 7
new Random().nextBytes(array);
String generatedString = new String(array, Charset.forName("UTF-8"));
System.out.println(generatedString);
}
