java接口自动化常用的随机数生成方式

import java.util.Random;

public class RandomDataGenerator {

    private static final Random RANDOM = new Random();
    private static final String CHARACTERS = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
    private static final String EMAIL_DOMAINS[] = {"gmail.com", "yahoo.com", "hotmail.com", "outlook.com", "example.com"};
    private static final String PHONE_PREFIXES[] = {"130", "131", "132", "133", "134", "135", "136", "137", "138", "139", "147", "150", "151", "152", "157", "158", "159", "182", "183", "184", "187", "188", "130496"};

    // 生成指定范围内的随机整数
    public static int randomInt(int min, int max) {
        return RANDOM.nextInt(max - min + 1) + min;
    }

    // 生成指定范围内的随机长整数
    public static long randomLong(long min, long max) {
        return RANDOM.nextLong() % (max - min + 1) + min;
    }

    // 生成指定范围内的随机浮点数
    public static double randomDouble(double min, double max) {
        return min + (max - min) * RANDOM.nextDouble();
    }

    // 生成随机布尔值
    public static boolean randomBoolean() {
        return RANDOM.nextBoolean();
    }

    // 生成指定长度的随机字符串
    public static String randomString(int length) {
        String characters = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
        StringBuilder sb = new StringBuilder(length);
        for (int i = 0; i < length; i++) {
            int index = RANDOM.nextInt(characters.length());
            sb.append(characters.charAt(index));
        }
        return sb.toString();
    }

    // 生成指定长度的随机字母字符串
    public static String randomAlphabeticString(int length) {
        String characters = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
        StringBuilder sb = new StringBuilder(length);
        for (int i = 0; i < length; i++) {
            int index = RANDOM.nextInt(characters.length());
            sb.append(characters.charAt(index));
        }
        return sb.toString();
    }

    // 生成指定长度的随机数字字符串
    public static String randomNumericString(int length) {
        String characters = "0123456789";
        StringBuilder sb = new StringBuilder(length);
        for (int i = 0; i < length; i++) {
            int index = RANDOM.nextInt(characters.length());
            sb.append(characters.charAt(index));
        }
        return sb.toString();
    }

    // 生成指定长度的随机 UUID 字符串
    public static String randomUUID() {
        return UUID.randomUUID().toString();
    }

    // 生成指定范围内的随机日期（以毫秒为单位）
    public static long randomDate(long startMillis, long endMillis) {
        return startMillis + (long) (RANDOM.nextDouble() * (endMillis - startMillis));
    }


    /**
     * 生成指定开头并且随机长度的字符串
     *
     * @param prefix 指定的开头字符串
     * @param minLength 最小长度（包括前缀）
     * @param maxLength 最大长度（包括前缀）
     * @return 生成的随机字符串
     */
    public static String generateRandomStringWithPrefix(String prefix, int minLength, int maxLength) {
        if (minLength < prefix.length() || maxLength < minLength) {
            throw new IllegalArgumentException("Invalid length parameters. Ensure that minLength >= prefix.length() and maxLength >= minLength.");
        }

        Random random = new Random();
        int length = random.nextInt(maxLength - minLength + 1) + minLength;
        int randomPartLength = length - prefix.length();

        StringBuilder randomString = new StringBuilder(prefix);
        for (int i = 0; i < randomPartLength; i++) {
            int index = random.nextInt(CHARACTERS.length());
            randomString.append(CHARACTERS.charAt(index));
        }

        return randomString.toString();
    }

    /**
     * 生成随机邮箱
     *
     * @return 生成的随机邮箱
     */
    public static String generateRandomEmail() {
        Random random = new Random();
        String username = generateRandomStringWithPrefix("", 5, 10); // 生成5到10个字符的用户名
        String domain = EMAIL_DOMAINS[random.nextInt(EMAIL_DOMAINS.length)];
        return username + "@" + domain;
    }

    /**
     * 生成随机手机号
     *
     * @return 生成的随机手机号
     */
    public static String generateRandomPhoneNumber() {
        Random random = new Random();
        String prefix = PHONE_PREFIXES[random.nextInt(PHONE_PREFIXES.length)];
        StringBuilder phoneNumber = new StringBuilder(prefix);
        for (int i = 0; i < 8; i++) { // 生成8位数字
            phoneNumber.append(random.nextInt(10));
        }
        return phoneNumber.toString();
    }
    public static void main(String[] args) {
        // 示例用法
        System.out.println("Random Int: " + randomInt(1, 100));
        System.out.println("Random Long: " + randomLong(1L, 1000000L));
        System.out.println("Random Double: " + randomDouble(1.0, 100.0));
        System.out.println("Random Boolean: " + randomBoolean());
        System.out.println("Random String: " + randomString(10));
        System.out.println("Random Alphabetic String: " + randomAlphabeticString(10));
        System.out.println("Random Numeric String: " + randomNumericString(10));
        System.out.println("Random UUID: " + randomUUID());
        System.out.println("Random Date: " + randomDate(System.currentTimeMillis() - 365 * 24 * 60 * 60 * 1000, System.currentTimeMillis()));
    }

}