根据经纬高计算距离,经纬差换算距离

package com.yizhijob.cicada.utils;import java.math.BigDecimal;import java.math.RoundingMode;import java.text.NumberFormat;/** * @Author 李云波 * @note 2017/8/12下午2:12 */public class LocationUtils { private static final double EARTH_RADIUS = 6378.137; private static double rad(double d){ return d * Math.PI / 180.0; } public static double getmeter(double long1, double lat1, double long2, double lat2) { double a, b, d, sa2, sb2; lat1 = rad(lat1); lat2 = rad(lat2); a = lat1 - lat2; b = rad(long1 - long2); sa2 = Math.sin(a / 2.0); sb2 = Math.sin(b / 2.0); d = 2 * EARTH_RADIUS * Math.asin(Math.sqrt(sa2 * sa2 + Math.cos(lat1) * Math.cos(lat2) * sb2 * sb2)); d= d * 1000; BigDecimal bg = new BigDecimal(d).setScale(2, RoundingMode.UP); return bg.doubleValue(); // return d; } public static String getStringmeter(double long1, double lat1, double long2, double lat2) { double a, b, d, sa2, sb2; lat1 = rad(lat1); lat2 = rad(lat2); a = lat1 - lat2; b = rad(long1 - long2); sa2 = Math.sin(a / 2.0); sb2 = Math.sin(b / 2.0); d = 2 * EARTH_RADIUS * Math.asin(Math.sqrt(sa2 * sa2 + Math.cos(lat1) * Math.cos(lat2) * sb2 * sb2)); d= d * 1000; BigDecimal bg = new BigDecimal(d).setScale(2, RoundingMode.UP); return String.valueOf(bg.doubleValue()); // return d; }}

iptables-iptables配置