DistanceCalculator.java

import java.math.BigDecimal;

public class DistanceCalculator {

    /**
     * Calculates distance between to points and returns in meters.
     *
     * @param latitude1
     * @param longitude1
     * @param latitude2
     * @param longitude2
     * @return
     */
    public static BigDecimal distance(BigDecimal latitude1, BigDecimal longitude1, BigDecimal latitude2, BigDecimal longitude2) {
        if (latitude1.equals(latitude2) && latitude1.equals(longitude2)) {
            return BigDecimal.ZERO;
        }
        else {
            double lat1 = latitude1.doubleValue();
            double lon1 = longitude1.doubleValue();
            double lat2 = latitude2.doubleValue();
            double lon2 = longitude2.doubleValue();
            double theta = lon1 - lon2;
            double dist = Math.sin(Math.toRadians(lat1)) * Math.sin(Math.toRadians(lat2)) + Math.cos(Math.toRadians(lat1)) * Math.cos(Math.toRadians(lat2)) * Math.cos(Math.toRadians(theta));
            dist = Math.acos(dist);
            dist = Math.toDegrees(dist);
            dist = dist * 60 * 1.1515;
            return BigDecimal.valueOf(dist);
        }
    }
}