计算两个点（经纬度）之间的距离

private String countOutRange(RectificationPo old, RectificationPo now) {
double radLat1 = rad(old.getLatitude());
double radLat2 = rad(now.getLatitude());
double a = radLat1 - radLat2;
double b = rad(old.getLongitude()) - rad(now.getLongitude());
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 * 6371.393;
s = Math.round(s * 1000);
//s 去比较
int i = new Double(s).compareTo(new Double(old.getRange()));
if(i>0){
return "1";
}
return "0";
}
private double rad(String d) 
    { 
       return Double.parseDouble(d) * Math.PI / 180.0; 
    } 

public static void main(String[] args) { 
RectificationPo old = new RectificationPo();
RectificationPo now = new RectificationPo();
old.setLongitude("106.486654");
old.setLatitude("29.490295");
now.setLongitude("106.486654");
now.setLatitude("29.615467");
old.setRange("13000");
        System.out.println(new RectificationServiceImpl().countOutRange(old,now)); 
    } 

校验工具：
http://www.storyday.com/wp-content/uploads/2008/09/latlung_dis.html