93 lines
2.9 KiB
Java
93 lines
2.9 KiB
Java
package com.muyu.web.utils;
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import com.muyu.web.domain.model.PositionModel;
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import java.math.BigDecimal;
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import java.math.RoundingMode;
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import java.util.Random;
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public class VehicleUtils {
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/**
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* 生成VIN
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* @return 返回结果对象
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*/
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public static String genVin() {
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String characters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
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Random random = new Random();
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StringBuilder sb = new StringBuilder(17);
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for (int i = 0; i < 17; i++) {
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int index = (int) (random.nextFloat() * characters.length());
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sb.append(characters.charAt(index));
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}
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return sb.toString();
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}
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private static Random random = new Random();
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/**
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* 生成电池额度
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* @return 电池额度
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*/
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public static BigDecimal genBattery(){
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return BigDecimal.valueOf(random.nextInt(60, 80) * 1000L);
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}
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/**
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* 两点之间的距离
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* @param startPositionModel 开始定位点
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* @param endPositionModel 结束定位点
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* @return
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*/
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public static BigDecimal distance(PositionModel startPositionModel, PositionModel endPositionModel){
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double lon1 = Double.parseDouble(startPositionModel.getLongitude());
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double lat1 = Double.parseDouble(startPositionModel.getLatitude());
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double lon2 = Double.parseDouble(endPositionModel.getLongitude());
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double lat2 = Double.parseDouble(endPositionModel.getLatitude());
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double lon1Rad = Math.toRadians(lon1);
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double lat1Rad = Math.toRadians(lat1);
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double lon2Rad = Math.toRadians(lon2);
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double lat2Rad = Math.toRadians(lat2);
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double earthRadius = 6371; // 地球半径（以公里为单位）
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double latDiff = lat2Rad - lat1Rad;
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double lonDiff = lon2Rad - lon1Rad;
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double a = Math.sin(latDiff / 2) * Math.sin(latDiff / 2) +
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Math.cos(lat1Rad) * Math.cos(lat2Rad) *
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Math.sin(lonDiff / 2) * Math.sin(lonDiff / 2);
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double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
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double distance = earthRadius * c;
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return BigDecimal.valueOf(distance).setScale(2, RoundingMode.HALF_UP);
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}
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/**
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* 生成电池浮动
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* @return 电池浮动值
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*/
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public static BigDecimal batteryFloat(){
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Random rand = new Random();
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// 生成0.00-0.31之间的随机数
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double num = rand.nextDouble() * 0.31;
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// 加上0.90，得到0.90-1.21之间的随机数
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num += 0.90;
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// 保留两位小数
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num = (double) Math.round(num * 100) / 100;
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return BigDecimal.valueOf(num);
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}
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/**
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* 给予开始和结束的值生成数据
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* @param start 起始范围
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* @param end 截止范围
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* @return 返回结果
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*/
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public static String genValue(int start, int end){
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Random rand = new Random();
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return String.valueOf(rand.nextInt(start, end));
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}
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}
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