java随机生成批量数据

以下是一些Java随机生成批量数据的示例代码：

1. 生成随机字符串

import java.util.Random;

public class RandomStringGenerator {
    private static final String CHARACTERS = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
    private static Random random = new Random();

    public static String generate(int length) {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < length; i++) {
            int randomIndex = random.nextInt(CHARACTERS.length());
            char randomChar = CHARACTERS.charAt(randomIndex);
            sb.append(randomChar);
        }
        return sb.toString();
    }
}

使用示例：

String randomString = RandomStringGenerator.generate(10);
System.out.println(randomString); // Output: "tHkRzKvLpT"

2. 生成随机整数

import java.util.Random;

public class RandomIntegerGenerator {
    private static Random random = new Random();

    public static int generate(int min, int max) {
        return random.nextInt(max - min + 1) + min;
    }
}

使用示例：

int randomNumber = RandomIntegerGenerator.generate(1, 100);
System.out.println(randomNumber); // Output: a random integer between 1 and 100 inclusive

3. 生成随机日期

import java.time.LocalDate;
import java.util.Random;

public class RandomDateGenerator {
    private static Random random = new Random();

    public static LocalDate generate(LocalDate start, LocalDate end) {
        long startEpochDay = start.toEpochDay();
        long endEpochDay = end.toEpochDay();
        long randomEpochDay = startEpochDay + random.nextInt((int) (endEpochDay - startEpochDay));
        return LocalDate.ofEpochDay(randomEpochDay);
    }
}

使用示例：

LocalDate startDate = LocalDate.of(2021, 1, 1);
LocalDate endDate = LocalDate.of(2021, 12, 31);
LocalDate randomDate = RandomDateGenerator.generate(startDate, endDate);
System.out.println(randomDate); // Output: a random date between 2021-01-01 and 2021-12-31 inclusive

可以根据需要修改代码以生成不同类型的随机数据。