100 lines
4.3 KiB
Java
100 lines
4.3 KiB
Java
package com.ruoyi.system.controller;
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import com.ruoyi.system.domain.SysUnitConvert;
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import com.ruoyi.system.service.ISysUnitConvertService;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.stereotype.Component;
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import java.math.BigDecimal;
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import java.math.RoundingMode;
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@Component
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public class UnitConvert {
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private final ISysUnitConvertService sysUnitConvertService;
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@Autowired
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public UnitConvert(ISysUnitConvertService sysUnitConvertService) {
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this.sysUnitConvertService = sysUnitConvertService;
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}
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public double ConvertUniter(String unitType, double oldValue, int oldUnit, int newUnit) {
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// 查询旧单位信息
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if ("temperature".equalsIgnoreCase(unitType)) {
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return handleTemperatureConversion(BigDecimal.valueOf(oldValue), (long) oldUnit, (long) newUnit).doubleValue();
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} else {
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SysUnitConvert tempUnit = new SysUnitConvert();
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tempUnit.setUnitType(unitType);
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tempUnit.setUnitOrder((long) oldUnit);
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SysUnitConvert oldUnitInfo = sysUnitConvertService.selectSysUnitConvertUnitByTypeOrder(tempUnit);
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if (oldUnitInfo == null) {
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throw new IllegalArgumentException("旧单位 '" + oldUnit + "' 不存在或不可用");
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}
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tempUnit=new SysUnitConvert();;
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tempUnit.setUnitType(unitType);
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tempUnit.setBaseUnit("Y");
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SysUnitConvert baseUnitInfo = sysUnitConvertService.selectSysUnitConvertUnitByTypeOrder(tempUnit);
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if (baseUnitInfo == null) {
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throw new IllegalArgumentException("基准单位 不存在或不可用");
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}
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tempUnit=new SysUnitConvert();
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tempUnit.setUnitType(unitType);
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tempUnit.setUnitOrder((long) newUnit);
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// 查询新单位信息
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SysUnitConvert newUnitInfo = sysUnitConvertService.selectSysUnitConvertUnitByTypeOrder(tempUnit);
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if (newUnitInfo == null) {
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throw new IllegalArgumentException("新单位 '" + newUnit + "' 不存在或不可用");
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}
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BigDecimal oldFactor = oldUnitInfo.getConversionFactor();
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BigDecimal newFactor = newUnitInfo.getConversionFactor();
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// 检查旧单位转换因子是否为零
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if (oldFactor.compareTo(BigDecimal.ZERO) == 0) {
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throw new ArithmeticException("旧单位 '" + oldUnit + "' 的转换因子为零，无法进行转换");
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}
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// 计算基准值：oldValue / oldFactor
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int scale = 20; // 设置足够大的精度以避免精度丢失
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BigDecimal baseValue = BigDecimal.valueOf(oldValue).divide(oldFactor, scale, RoundingMode.HALF_UP);
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// 计算新值：baseValue * newFactor
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BigDecimal newValue = baseValue.multiply(newFactor);
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// 四舍五入到合理的小数位数（例如10位）
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newValue = newValue.setScale(10, RoundingMode.HALF_UP);
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return newValue.doubleValue();
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}
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}
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// 温度转换方法
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public BigDecimal handleTemperatureConversion(BigDecimal oldValue, Long oldUnit, Long newUnit) {
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final BigDecimal THIRTY_TWO = BigDecimal.valueOf(32);
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final BigDecimal FIVE = BigDecimal.valueOf(5);
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final BigDecimal NINE = BigDecimal.valueOf(9);
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final BigDecimal TWO_HUNDRED_SEVENTY_THREE_POINT_ONE_FIVE = BigDecimal.valueOf(273.15);
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// 使用原始值计算
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BigDecimal celsius;
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if (oldUnit == 0) {
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celsius = oldValue;
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} else if (oldUnit == 1) {
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celsius = oldValue.subtract(THIRTY_TWO).multiply(FIVE).divide(NINE, 10, RoundingMode.HALF_UP);
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} else if (oldUnit == 2) {
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celsius = oldValue.subtract(TWO_HUNDRED_SEVENTY_THREE_POINT_ONE_FIVE);
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} else {
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throw new IllegalArgumentException("无效温度单位");
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}
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if (newUnit == 0) {
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return celsius;
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} else if (newUnit == 1) {
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return celsius.multiply(NINE).divide(FIVE, 10, RoundingMode.HALF_UP).add(THIRTY_TWO);
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} else if (newUnit == 2) {
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return celsius.add(TWO_HUNDRED_SEVENTY_THREE_POINT_ONE_FIVE);
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}
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throw new IllegalArgumentException("无效温度单位");
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}
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} |