实现

使用Oshi和Hutool工具包1、pom依赖

        <dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>com.github.oshi</groupId><artifactId>oshi-core</artifactId><version>6.4.0</version></dependency><dependency><groupId>io.projectreactor</groupId><artifactId>reactor-core</artifactId></dependency><!--swagger--><dependency><groupId>io.springfox</groupId><artifactId>springfox-boot-starter</artifactId><version>3.0.0</version></dependency><dependency><groupId>com.github.xiaoymin</groupId><artifactId>knife4j-spring-ui</artifactId><version>3.0.3</version></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><version>1.18.8</version></dependency><dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>1.2.83</version></dependency><dependency><groupId>org.apache.commons</groupId><artifactId>commons-lang3</artifactId></dependency><dependency><groupId>cn.hutool</groupId><artifactId>hutool-all</artifactId><version>5.8.11</version></dependency>

代码demo

1、工具类

Arith

package com.yy.agent.util;import java.math.BigDecimal;
import java.math.RoundingMode;/*** @author code* @version 1.0* @Date 2024/6/12 10:24* @Description 精确的浮点数运算*/
public class Arith {/** 默认除法运算精度 */private static final int DEF_DIV_SCALE = 10;/** 这个类不能实例化 */private Arith(){}/*** 提供精确的加法运算。* @param v1 被加数* @param v2 加数* @return 两个参数的和*/public static double add(double v1, double v2){BigDecimal b1 = new BigDecimal(Double.toString(v1));BigDecimal b2 = new BigDecimal(Double.toString(v2));return b1.add(b2).doubleValue();}/*** 提供精确的减法运算。* @param v1 被减数* @param v2 减数* @return 两个参数的差*/public static double sub(double v1, double v2){BigDecimal b1 = new BigDecimal(Double.toString(v1));BigDecimal b2 = new BigDecimal(Double.toString(v2));return b1.subtract(b2).doubleValue();}/*** 提供精确的乘法运算。* @param v1 被乘数* @param v2 乘数* @return 两个参数的积*/public static double mul(double v1, double v2){BigDecimal b1 = new BigDecimal(Double.toString(v1));BigDecimal b2 = new BigDecimal(Double.toString(v2));return b1.multiply(b2).doubleValue();}/*** 提供（相对）精确的除法运算，当发生除不尽的情况时，精确到* 小数点以后10位，以后的数字四舍五入。* @param v1 被除数* @param v2 除数* @return 两个参数的商*/public static double div(double v1, double v2){return div(v1, v2, DEF_DIV_SCALE);}/*** 提供（相对）精确的除法运算。当发生除不尽的情况时，由scale参数指* 定精度，以后的数字四舍五入。* @param v1 被除数* @param v2 除数* @param scale 表示表示需要精确到小数点以后几位。* @return 两个参数的商*/public static double div(double v1, double v2, int scale){if (scale < 0){throw new IllegalArgumentException("The scale must be a positive integer or zero");}BigDecimal b1 = new BigDecimal(Double.toString(v1));BigDecimal b2 = new BigDecimal(Double.toString(v2));if (b1.compareTo(BigDecimal.ZERO) == 0){return BigDecimal.ZERO.doubleValue();}return b1.divide(b2, scale, RoundingMode.HALF_U