出租车计费功能（java版解决方法）某大型互联网公司面试题，还附送测试代码哦

package homework.taxibilling.service.impl; import static homework.taxibilling.exceptions.TaxiBillingException.*; import static homework.taxibilling.contants.TaxiRegionTypeEnum.*; import java.util.Date; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import homework.taxibilling.dao.SimulateDao; import homework.taxibilling.po.FeeRule; import homework.taxibilling.po.Taxi; import homework.taxibilling.service.Billing; import homework.taxibilling.util.TimeOperatUtil; public class TaxiBilling implements Billing { private Date nowTime ; private Logger logger = LoggerFactory.getLogger(this.getClass()); //模拟去数据库读计费规则 private SimulateDao dao = new SimulateDao(); private Taxi taxi; public Date getNowTime() { return nowTime; } //该方法用于测试白天黑夜用 public void setNowTime(Date nowTime) { this.nowTime = nowTime; } public TaxiBilling(Taxi taxi) { this.taxi = taxi; init(); } /** * 计费算法 * 入参：出租车实例、行驶总距离 * 出参：计费结果 */ public double billing(Taxi taxi,double totalDistance) { // logger.info("---------------------------------------开始计费-----------------------------"); System.out.println("---------------------------------------开始计费-----------------------------"); /* * 异常检查 */ if(null == taxi){ throw TAXI_ISNULL_ERROR; } if(0.0d > totalDistance){ throw FEEDISTANCE_ISNEGATIVE_ERROR; } if(0.0d == totalDistance){ return 0.0d; } //判断计费开始时间 boolean isDaylight ; if(null==nowTime){ isDaylight = TimeOperatUtil.isBelong(); } else { isDaylight = TimeOperatUtil.isBelong(nowTime); } // logger.info("---------------------------------------开始计费时间是否在白天： "+isDaylight); System.out.println("---------------------------------------开始计费时间是否在白天： "+isDaylight); //如果是白天 if(isDaylight){ //白天上车 return billingInDaylight(taxi,totalDistance); } else { //夜间上车 return billingInNight(taxi,totalDistance); } } private double billingInDaylight(Taxi taxi,double totalDistance){ FeeRule rule = taxi.getRule(); if(null == rule){ throw FEERULE_ISNULL_ERROR; } //计费总路程 int billingDistance = (int) Math.ceil(totalDistance); //taxi是内环出租车 if(INNER_RING.equals(taxi.getRegion())){ // 起步价到终点 if(rule.getInitialMaxDistanceDaylight() >= billingDistance){ return rule.getInitialPriceDaylight(); } //起步价距离至临界距离之间 到终点 else if ( (rule.getInitialMaxDistanceDaylight() < billingDistance) && (rule.getCriticalDistance() >= billingDistance) ) { // 超出起步距离的费用 double exceedInitialFee = rule.getUnitPriceDaylight() * (billingDistance - rule.getInitialMaxDistanceDaylight()); System.out.println("超出起步距离的费用: "+exceedInitialFee); //返回起步距离费用+超出费用 return rule.getInitialPriceDaylight()+exceedInitialFee; } //超出临界距离 才到终点 else { //超出部分：起步距离至临界距离之间 的费用 double exceedBetweenInitialAndCriticalFee = rule.getUnitPriceDaylight() * (rule.getCriticalDistance()-rule.getInitialMaxDistanceDaylight()); System.out.println("超出起步距离的费用: "+exceedBetweenInitialAndCriticalFee); //超出部分：超出临界距离 的费用 double exceedCriticalFee = rule.getUnitPriceCriticalDaylight() * (billingDistance - rule.getCriticalDistance()); System.out.println("超出临界距离 的费用: "+exceedCriticalFee); //返回各部分之和 return rule.getInitialPriceDaylight()+exceedBetweenInitialAndCriticalFee+exceedCriticalFee; } } //外环出租车 else { // 起步价到终点 if (rule.getInitialMaxDistanceDaylight() >= billingDistance) { return rule.getInitialPriceDaylight(); } //外环的出租车10公里之外的价格与10公里之内相同 else{ // 超出起步距离的费用 double exceedInitialFee = rule.getUnitPriceDaylight() * (billingDistance - rule.getInitialMaxDistanceDaylight()); System.out.println("超出起步距离的费用: "+exceedInitialFee); //返回起步距离费用+超出费用 return rule.getInitialPriceDaylight()+exceedInitialFee; } } } private double billingInNight(Taxi taxi,double totalDistance){ FeeRule rule = taxi.getRule(); if(null == rule){ throw FEERULE_ISNULL_ERROR; } //计费总路程 int billingDistance = (int) Math.ceil(totalDistance); // taxi是内环出租车 if (INNER_RING.equals(taxi.getRegion())) { // 起步价到终点 if(rule.getInitialMaxDistanceNight() >= billingDistance){ return rule.getInitialPriceNight(); } //起步价距离至临界距离之间 到终点 else if ( (rule.getInitialMaxDistanceNight() < billingDistance) && (rule.getCriticalDistance() >= billingDistance) ) { // 超出起步距离的费用 double exceedInitialFee = rule.getUnitPriceNight() * (billingDistance - rule.getInitialMaxDistanceNight()); System.out.println("超出起步距离的费用: "+exceedInitialFee); //返回起步距离费用+超出费用 return rule.getInitialPriceNight()+exceedInitialFee; } //超出临界距离 才到终点 else { //超出部分：起步距离至临界距离之间 的费用 double exceedBetweenInitialAndCriticalFee = rule.getUnitPriceNight() * (rule.getCriticalDistance()-rule.getInitialMaxDistanceNight()); System.out.println("超出起步距离的费用: "+exceedBetweenInitialAndCriticalFee); //超出部分：超出临界距离 的费用 double exceedCriticalFee = rule.getUnitPriceCriticalNight() * (billingDistance - rule.getCriticalDistance()); System.out.println("超出临界距离 的费用: "+exceedCriticalFee); //返回各部分之和 return rule.getInitialPriceNight()+exceedBetweenInitialAndCriticalFee+exceedCriticalFee; } } // 外环出租车 else { // 起步价到终点 if (rule.getInitialMaxDistanceNight() >= billingDistance) { return rule.getInitialPriceNight(); } // 外环的出租车10公里之外的价格与10公里之内相同 else { // 超出起步距离的费用 double exceedInitialFee = rule.getUnitPriceNight() * (billingDistance - rule.getInitialMaxDistanceNight()); System.out.println("超出起步距离的费用: "+exceedInitialFee); // 返回起步距离费用+超出费用 return rule.getInitialPriceNight() + exceedInitialFee; } } } /* * taxi和rule的初始化 */ private void init() { /* * 异常检查 */ if(null == taxi){ throw TAXI_ISNULL_ERROR; } if (null == taxi.getRegion()) { throw TAXI_REGION_VALUE_ERROR; } // logger.info("----------------------------根据taxi内外环属性，初始化计费规则------------------------"); System.out.println("----------------------------根据taxi内外环属性: "+taxi.getRegion().getDesc() +"，初始化计费规则------------------------"); FeeRule rules = new FeeRule(); rules = dao.getContentFromDatabase(taxi.getRegion().getValue()); checkRules(rules); // logger.info("----------------------------计费规则为： "+rules); System.out.println("----------------------------计费规则为： "+rules); if (null == rules) { throw FEERULE_ISNULL_ERROR; } taxi.setRule(rules); } private void checkRules(FeeRule rule){ /* * 数据异常检查 */ if((rule.getCriticalDistance() <= rule.getInitialMaxDistanceDaylight()) ||(rule.getCriticalDistance() <= rule.getInitialMaxDistanceNight()) ){ throw CRITICALE_DISTANCE_ERROR; } if( (rule.getCriticalDistance() < 0) || (rule.getInitialMaxDistanceDaylight() < 0) || (rule.getInitialMaxDistanceNight() < 0) || (rule.getInitialPriceDaylight() < 0.0d) || (rule.getInitialPriceNight() < 0.0d) || (rule.getUnitPriceCri