package com.moral.util;
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import org.springframework.util.ObjectUtils;
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import javax.script.ScriptEngine;
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import javax.script.ScriptEngineManager;
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import javax.script.ScriptException;
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import java.math.BigDecimal;
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/**
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* @ClassName UnitConvertUtils
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* @Description TODO
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* @Author 陈凯裕
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* @Date 2021/7/5 9:00
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* @Version TODO
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**/
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public class UnitConvertUtils {
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/*
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* 小数点后保留位数
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* */
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public static Integer num = 3;
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/**
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* @Description: value为要转换的值，format为公式
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* @Param: [value, format]
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* @return: java.lang.Double
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* @Author: 陈凯裕
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* @Date: 2021/7/5
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*/
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public static String calculate(String value, String formula) {
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if(ObjectUtils.isEmpty(formula))
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return null;
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ScriptEngine jse = new ScriptEngineManager().getEngineByName("JavaScript");
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formula = formula.replaceAll("\\{0\\}", value);
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Double result = null;
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try {
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result = (Double) jse.eval(formula);
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} catch (ScriptException e) {
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e.printStackTrace();
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}
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//保留小数点后三位
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BigDecimal bg = new BigDecimal(result);
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result = bg.setScale(num, BigDecimal.ROUND_HALF_UP).doubleValue();
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return result.toString();
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}
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}
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