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Hutool是一个小而全的Java工具类库，通过静态方法封装，降低相关API的学习成本，提高工作效率，使Java拥有函数式语言般的优雅，让Java语言也可以“甜甜的”。

There is a newer version: 5.8.34

package cn.hutool.core.convert;

import cn.hutool.core.convert.impl.DateConverter;
import cn.hutool.core.convert.impl.TemporalAccessorConverter;

import java.lang.reflect.Type;
import java.time.temporal.TemporalAccessor;
import java.util.Date;

/**
 * 包含格式的数字转换器，主要针对带格式的时间戳
 *
 * @author looly
 * @since 5.8.13
 */
public class NumberWithFormat extends Number implements TypeConverter{
	private static final long serialVersionUID = 1L;

	private final Number number;
	private final String format;

	/**
	 * 构造
	 * @param number 数字
	 * @param format 格式
	 */
	public NumberWithFormat(final Number number, final String format) {
		this.number = number;
		this.format = format;
	}

	@SuppressWarnings("unchecked")
	@Override
	public Object convert(Type targetType, Object value) {
		// 自定义日期格式
		if (null != this.format && targetType instanceof Class) {
			final Class clazz = (Class) targetType;
			// https://gitee.com/dromara/hutool/issues/I6IS5B
			if (Date.class.isAssignableFrom(clazz)) {
				return new DateConverter((Class) clazz, format).convert(this.number, null);
			} else if (TemporalAccessor.class.isAssignableFrom(clazz)) {
				return new TemporalAccessorConverter(clazz, format).convert(this.number, null);
			} else if(String.class == clazz){
				return toString();
			}

			// 其他情况按照正常数字转换
		}

		// 按照正常数字转换
		return Convert.convertWithCheck(targetType, this.number, null, false);
	}

	@Override
	public int intValue() {
		return this.number.intValue();
	}

	@Override
	public long longValue() {
		return this.number.longValue();
	}

	@Override
	public float floatValue() {
		return this.number.floatValue();
	}

	@Override
	public double doubleValue() {
		return this.number.doubleValue();
	}

	@Override
	public String toString() {
		return this.number.toString();
	}
}