注解

package cn.ac.iscas.utils;import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;/*** 注解用于生成测试数据*/
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.FIELD)
public @interface ValueRange {double min() default Double.MIN_VALUE;//生成最小值double max() default Double.MAX_VALUE;//生成最大值int decimalPlaces() default 0; // 小数点后的位数，默认为0
}

工具类

package cn.ac.iscas.utils;import cn.ac.iscas.entity.topic2.NearshoreBuoyMonitoringADCP;import java.lang.reflect.Field;
import java.util.Date;
import java.util.Random;/*** 根据实体类配置ValueRange注解的最大值最小值生成测试数据*/
public class DataGeneratorUtils {public static void main(String[] args) throws IllegalAccessException, InstantiationException {System.out.println(generateTestData(NearshoreBuoyMonitoringADCP.class));}private static final Random random = new Random();private static final int DEFAULT_STRING_LENGTH = 10;private static final int DEFAULT_NUMBER_DIGITS = 5; // 默认生成数字的位数public static <T> T generateTestData(Class<T> clazz) throws IllegalAccessException, InstantiationException {T instance = clazz.newInstance();Field[] fields = clazz.getDeclaredFields();for (Field field : fields) {field.setAccessible(true); // 设置字段可访问Class<?> fieldType = field.getType();if (field.isAnnotationPresent(ValueRange.class)) {ValueRange range = field.getAnnotation(ValueRange.class);if (fieldType.equals(int.class) || fieldType.equals(Integer.class)) {field.set(instance, generateRandomIntInRange(range.min(), range.max()));} else if (fieldType.equals(long.class) || fieldType.equals(Long.class)) {field.set(instance, generateRandomLongInRange(range.min(), range.max()));} else if (fieldType.equals(float.class) || fieldType.equals(Float.class)) {field.set(instance, generateRandomFloatInRange(range.min(), range.max(),range.decimalPlaces()));} else if (fieldType.equals(double.class) || fieldType.equals(Double.class)) {field.set(instance, generateRandomDoubleInRange(range.min(), range.max(),range.decimalPlaces()));} // 可根据需要扩展其他类型的数据生成} else {// 如果没有注解，则正常生成数据if (fieldType.equals(int.class) || fieldType.equals(Integer.class)) {field.set(instance, generateRandomInt());} else if (fieldType.equals(long.class) || fieldType.equals(Long.class)) {field.set(instance, generateRandomLong());} else if (fieldType.equals(float.class) || fieldType.equals(Float.class)) {field.set(instance, generateRandomFloat());} else if (fieldType.equals(double.class) || fieldType.equals(Double.class)) {field.set(instance, generateRandomDouble());} else if (fieldType.equals(boolean.class) || fieldType.equals(Boolean.class)) {field.set(instance, random.nextBoolean());} else if (fieldType.equals(String.class)) {field.set(instance, generateRandomString(DEFAULT_STRING_LENGTH));} else if (fieldType.equals(Date.class)) {field.set(instance, generateRandomDate());} // 可根据需要扩展其他类型的数据生成}}return instance;}private static String generateRandomString(int length) {StringBuilder sb = new StringBuilder();for (int i = 0; i < length; i++) {char c = (char) (random.nextInt(26) + 'a');sb.append(c);}return sb.toString();}private static int generateRandomInt() {int min = (int) Math.pow(10, DEFAULT_NUMBER_DIGITS - 1);int max = (int) Math.pow(10, DEFAULT_NUMBER_DIGITS) - 1;return random.nextInt(max - min + 1) + min;}private static long generateRandomLong() {long min = (long) Math.pow(10, DEFAULT_NUMBER_DIGITS - 1);long max = (long) Math.pow(10, DEFAULT_NUMBER_DIGITS) - 1;return min + ((long) (random.nextDouble() * (max - min)));}private static float generateRandomFloat() {float min = (float) Math.pow(10, -DEFAULT_NUMBER_DIGITS);float max = (float) Math.pow(10, DEFAULT_NUMBER_DIGITS);return min + random.nextFloat() * (max - min);}private static double generateRandomDouble() {double min = Math.pow(10, -DEFAULT_NUMBER_DIGITS);double max = Math.pow(10, DEFAULT_NUMBER_DIGITS);return min + random.nextDouble() * (max - min);}private static Date generateRandomDate() {long currentTimeMillis = System.currentTimeMillis();long randomTimeMillis = random.nextLong() % currentTimeMillis;return new Date(randomTimeMillis);}private static int generateRandomIntInRange(double min, double max) {return (int) (min + random.nextDouble() * (max - min));}private static long generateRandomLongInRange(double min, double max) {return (long) (min + random.nextDouble() * (max - min));}private static double roundToDecimalPlaces(double value, int decimalPlaces) {double factor = Math.pow(10, decimalPlaces);return Math.round(value * factor) / factor;}private static float roundToDecimalPlaces(float value, int decimalPlaces) {float factor = (float) Math.pow(10, decimalPlaces);return Math.round(value * factor) / factor;}// 在生成随机数时使用 roundToDecimalPlaces 方法进行处理private static float generateRandomFloatInRange(double min, double max, int decimalPlaces) {float value = (float) (min + random.nextDouble() * (max - min));return roundToDecimalPlaces(value, decimalPlaces);}private static double generateRandomDoubleInRange(double min, double max, int decimalPlaces) {double value = min + random.nextDouble() * (max - min);return roundToDecimalPlaces(value, decimalPlaces);}
}

示例实体类

public class NearshoreBuoyMonitoringCO2 {private String _id;@DSColumnComment("时间")private Date time;@DSColumnComment("水中CO2(ppb)")@ValueRange(min = 0, max = 3000, decimalPlaces = 2)private Double co2InWater;@DSColumnComment("空气中CO2(ppb)")@ValueRange(min = 0, max = 3000, decimalPlaces = 2)private Double co2InAir;
}