Generate Random String in Java

This example shows how to generate a random String in Java.

Generating Random Alphanumeric String in Java.

The code below show you how to use the Apache Commons RandomStringUtils class to generate some random string data.

import org.apache.commons.lang.RandomStringUtils;

public class RandomStringUtilsDemo {

    public static void main(String[] args) {
        //
        // Creates a 64 chars length random string of number.
        //
        String result = RandomStringUtils.random(64, false, true);
        System.out.println("random = " + result);

        //
        // Creates a 64 chars length of random alphabetic string.
        //
        result = RandomStringUtils.randomAlphabetic(64);
        System.out.println("random = " + result);

        //
        // Creates a 32 chars length of random ascii string.
        //
        result = RandomStringUtils.randomAscii(32);
        System.out.println("random = " + result);

        //
        // Creates a 32 chars length of string from the defined array of
        // characters including numeric and alphabetic characters.
        //
        result = RandomStringUtils.random(32, 0, 20, true, true, "qw32rfHIJk9iQ8Ud7h0X".toCharArray());
        System.out.println("random = " + result);
    }

}

import org.apache.commons.lang.RandomStringUtils;

public class RandomStringUtilsDemo {

public static void main(String[] args) {

// Creates a 64 chars length random string of number.

String result = RandomStringUtils.random(64, false, true);

System.out.println("random = " + result);

// Creates a 64 chars length of random alphabetic string.

result = RandomStringUtils.randomAlphabetic(64);

System.out.println("random = " + result);

// Creates a 32 chars length of random ascii string.

result = RandomStringUtils.randomAscii(32);

System.out.println("random = " + result);

// Creates a 32 chars length of string from the defined array of

// characters including numeric and alphabetic characters.

result = RandomStringUtils.random(32, 0, 20, true, true, "qw32rfHIJk9iQ8Ud7h0X".toCharArray());

System.out.println("random = " + result);

}

Output:

random = 2377316738997278218735578855577798247976319451877477254850564896
random = wwqbLxlRynIdptAoxuSIfbABRoOFHLyKaFEscrUoBQjAHPOkcIqfHuMnhXVzaLCf
random = 6nQ0PJf<#VgIi=’&d*Ru#i_exMoHXb
random = ZGbelXYEiLrlLBXKroCIDJPrevZPIGkD

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