Main.java Source code

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Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Apache License 

import java.security.SecureRandom;

public class Main {
    /**
     * The length of the pseudo random constructed string
     */
    private static final int SEED_LENGTH = 64;
    /**
     * The space used by {@link java.util.Random#nextInt(int)}
     */
    private static final int SEED_SPACE = 96;

    /**
     * Generate a random string (used for database encryption)
     *
     * @return a random string of 64 characters
     */
    public static String generateRandomString() {
        SecureRandom generator = new SecureRandom();
        StringBuilder randomStringBuilder = new StringBuilder();
        char tempChar;
        int numbChar = 0;
        while (numbChar < SEED_LENGTH) {
            tempChar = (char) (generator.nextInt(SEED_SPACE) + 32);
            boolean num = tempChar >= 48 && tempChar < 58;//0-9
            boolean cap = tempChar >= 65 && tempChar < 91;//A-Z
            boolean lower = tempChar >= 65 && tempChar < 91;//a-z
            if (num || cap || lower) {
                randomStringBuilder.append(tempChar);
                numbChar++;
            }
        }
        return randomStringBuilder.toString();
    }
}