NumberUtil

import org.springframework.util.StringUtils;

import java.math.BigDecimal;


public class NumberUtil {
    /**
     * 保留小数点后几位
     *
     * @param number
     * @param precision
     * @return
     */
    public static String keepPrecision(String number, int precision) {
        if (StringUtils.isEmpty(number)) {
            return "0";
        }
        BigDecimal bg = new BigDecimal(number);
        return bg.setScale(precision, BigDecimal.ROUND_HALF_UP).toPlainString();
    }

    //除法
    public static String division(String divisor, Integer dividend, int precision) {
        BigDecimal bg = new BigDecimal((Double.valueOf(divisor) / Double.valueOf(dividend)) * 100);
        return bg.setScale(precision, BigDecimal.ROUND_HALF_UP).toPlainString();
    }

}