Java单位换算功能
昵称要骚 人气:1使用枚举进行简单计算
只加入了一些简单常用的单位,如有需要自行添加,以标准单位为基准
package com.dessert.common.enu; import org.apache.commons.lang3.StringUtils; import java.math.BigDecimal; public class UnitConversion { /** * 默认保留两位小数,四舍五入 * * @param value 原始数值 * @param original 原始单位 * @param need 转换的单位 * @return */ public static BigDecimal conversion(BigDecimal value, UnitsEnum original, UnitsEnum need) { return conversion(value, original, need, 2); } /** * @param value 原始数值 * @param original 原始单位 * @param need 转换的单位 * @param scale 小数点位数 * @return */ public static BigDecimal conversion(BigDecimal value, UnitsEnum original, UnitsEnum need, int scale) { if (original == UnitsEnum.UN_KNOWN || need == UnitsEnum.UN_KNOWN) { throw new IllegalArgumentException("存在不支持的单位参数"); } if (original.category != need.category) { throw new IllegalArgumentException("转换单位不统一!" + original.category.name + "不能转换为" + need.category.name); } return value == null ? new BigDecimal(0) : value.multiply(need.rate).divide(original.rate, scale, BigDecimal.ROUND_HALF_UP); } /** * 默认保留两位小数,四舍五入 * * @param value 原始数值 * @param original 原始单位 * @param need 转换的单位 * @return */ public static BigDecimal conversion(BigDecimal value, String original, String need) { return conversion(value, getUnitEnum(original), getUnitEnum(need)); } public static UnitsEnum getUnitEnum(String unit) { if (StringUtils.isNotEmpty(unit)) { for (UnitsEnum unitEnum : UnitsEnum.values()) { for (String possibleName : unitEnum.possibleNames) { if (possibleName.equals(unit.toLowerCase())) { return unitEnum; } } } } return UnitsEnum.UN_KNOWN; } public enum UnitsEnum { LG_KM(CategoryEnum.LENGTH, "km", new String[]{"km", "千米"}, new BigDecimal("0.001"), "千米"), LG_M(CategoryEnum.LENGTH, "m", new String[]{"m", "米"}, new BigDecimal("1"), "米"), LG_Dm(CategoryEnum.LENGTH, "dm", new String[]{"dm", "分米"}, new BigDecimal("10"), "分米"), LG_CM(CategoryEnum.LENGTH, "cm", new String[]{"cm", "厘米"}, new BigDecimal("100"), "厘米"), LG_MM(CategoryEnum.LENGTH, "mm", new String[]{"mm", "毫米"}, new BigDecimal("1000"), "毫米"), LG_UM(CategoryEnum.LENGTH, "um", new String[]{"um", "微米"}, new BigDecimal("1000000"), "微米"), LG_NM(CategoryEnum.LENGTH, "nm", new String[]{"nm", "纳米"}, new BigDecimal("1000000000"), "纳米"), LG_INCH(CategoryEnum.LENGTH, "inch", new String[]{"in", "inch", "英寸"}, new BigDecimal("39.3700787"), "英寸"), EG_T(CategoryEnum.WEIGHT, "t", new String[]{"t", "吨"}, new BigDecimal("0.001"), "吨"), EG_KG(CategoryEnum.WEIGHT, "kg", new String[]{"kg", "千克"}, new BigDecimal("1"), "千克"), EG_G(CategoryEnum.WEIGHT, "g", new String[]{"g", "克"}, new BigDecimal("1000"), "克"), EG_MG(CategoryEnum.WEIGHT, "mg", new String[]{"mg", "毫克"}, new BigDecimal("1000000"), "毫克"), EG_UG(CategoryEnum.WEIGHT, "μg", new String[]{"μg", "ug", "微克"}, new BigDecimal("1000000000"), "微克"), EG_LB(CategoryEnum.WEIGHT, "lb", new String[]{"lb", "lbs", "磅"}, new BigDecimal("2.2046226"), "磅"), EG_OZ(CategoryEnum.WEIGHT, "oz", new String[]{"oz", "盎司"}, new BigDecimal("35.2739619"), "盎司"), EG_CT(CategoryEnum.WEIGHT, "ct", new String[]{"ct", "克拉"}, new BigDecimal("5000"), "克拉"), UN_KNOWN(null, "未知", null, new BigDecimal("0"), "未知"); private CategoryEnum category; private String units; private String[] possibleNames; private BigDecimal rate; private String description; UnitsEnum(CategoryEnum category, String units, String[] possibleNames, BigDecimal rate, String description) { this.category = category; this.units = units; this.possibleNames = possibleNames; this.rate = rate; this.description = description; } public CategoryEnum getCategory() { return category; } public String getUnits() { return units; } public String[] getPossibleNames() { return possibleNames; } public BigDecimal getRate() { return rate; } public String getDescription() { return description; } private enum CategoryEnum { LENGTH("length", UnitsEnum.LG_M, "长度"), WEIGHT("weight", UnitsEnum.EG_KG, "重量"); private String name; private UnitsEnum base; private String description; CategoryEnum(String name, UnitsEnum base, String description) { this.name = name; this.base = base; this.description = description; } public String getName() { return name; } public UnitsEnum getBase() { return base; } public String getDescription() { return description; } } } }
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