Java计算两点经纬度距离及最短运行时间

概述

    经纬度在地图应用中常见，一般结合路网信息库，进行地图应用开发（流量、路况等），此次从理计算两点经纬度的直线距及最短运行时间预研，实现下述表达式：

 

 

package com.sunshine.app.utils;

import java.text.SimpleDateFormat;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public abstract class DeckUtils {

	public static final String TYPE = "yyyy-MM-dd HH:mm:ss";

	/**
	 * 地球半径
	 */
	public static double EARTH_RADIUS = 6378.137;

	private static Logger log = LoggerFactory.getLogger(DeckUtils.class);

	/**
	 * 两时间之差(小时)
	 * @param dateStr1
	 * @param dateStr2
	 * @return
	 * @throws Exception
	 */
	public static float diffHours(String dateStr1, String dateStr2)
			throws Exception {
		SimpleDateFormat sd = new SimpleDateFormat(TYPE);
		long l1 = sd.parse(dateStr1).getTime();
		long l2 = sd.parse(dateStr2).getTime();
		long diff = Math.abs(l1 - l2);
		float result = (float) diff / 1000 * 60 * 60;
		return Float.valueOf(new java.text.DecimalFormat("0.0").format(result));
	}

	/**
	 * 两时间之差(分钟)
	 * 
	 * @param dateStr1
	 * @param dateStr2
	 * @return
	 * @throws Exception
	 */
	public static float diffMinute(String dateStr1, String dateStr2)
			throws Exception {
		SimpleDateFormat sd = new SimpleDateFormat(TYPE);
		long l1 = sd.parse(dateStr1).getTime();
		long l2 = sd.parse(dateStr2).getTime();
		long diff = Math.abs(l1 - l2);
		float result = (float) diff / 1000 * 60;
		return Float.valueOf(new java.text.DecimalFormat("0.0").format(result));
	}

	/**
	 * 两点经纬度之间距离(米)
	 * @param lat1Str
	 * @param lng1Str
	 * @param lat2Str
	 * @param lng2Str
	 * @return
	 */
	public static double getDistance(String lat1Str, String lng1Str,
			String lat2Str, String lng2Str) {
		Double lat1 = Double.parseDouble(lat1Str);
		Double lng1 = Double.parseDouble(lng1Str);
		Double lat2 = Double.parseDouble(lat2Str);
		Double lng2 = Double.parseDouble(lng2Str);

		double radLat1 = rad(lat1);
		double radLat2 = rad(lat2);
		double a = radLat1 - radLat2;
		double b = rad(lng1) - rad(lng2);
		double s = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(a / 2), 2)
				+ Math.cos(radLat1) * Math.cos(radLat2)
				* Math.pow(Math.sin(b / 2), 2)));
		s = s * EARTH_RADIUS;
		s = Math.round(s * 10000) / 10000;
		return s;
	}

	private static double rad(double d) {
		return d * Math.PI / 180.0;
	}

	public static float getMinElapsetime(double meter, int speed) {
		float km = (float) meter / 1000;
		float elapse = (float) km / speed;
		return Float.valueOf(new java.text.DecimalFormat("0.0").format(elapse));
	}

	public static void main(String[] args) {
		try {
			System.out.println(DeckUtils.diffHours("2016-09-11 12:00:00",
					"2016-09-11 12:10:00"));
			double meter = getDistance("129.0043", "28.0344", "129.1234",
					"28.7008");
			float elapse = getMinElapsetime(meter, 120);
			System.out.println("运行时间：" + elapse);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

}