1.需求：指定一个经纬度坐标，如：(31.2121751783,121.4411213954)。周围有一堆经纬度坐标，找出与它最近的那个。
2.实现思路：将给出经纬度看成原点(0,0)。周围经纬度定位后利用三角形第三边计算原点到各个经纬度的半径距离，最短的那个即最近的经纬。
3.具体代码：
package com.zjj.LatAndLongDemo;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List; import com.zjj.Entity.LocalAddress; public class Test3 { private static List<LocalAddress> ilist = new ArrayList<LocalAddress>();
public static void main(String[] args) {
Test3 test3 = new Test3();
Double localDouble = 0.0; //定义一个二维数组存放经纬度
Double[][] doubles = { { 31.1963877723, 121.4940175770 },
{ 31.2020280000, 121.5006010000 },
{ 31.1963702573, 121.4940084124 },
{ 31.1951946273, 121.4991236524 },
{ 31.1983746273, 121.4895436524 },
{ 31.2068062375, 121.4686363819 },
{ 31.2127140000, 121.4751610000 },
{ 31.2067706666, 121.4686028298 },
{ 31.2056732366, 121.4737227198 },
{ 31.2087332366, 121.4640927198 },
{ 31.2103126101, 121.4457401593 },
{ 31.2166680000, 121.4521640000 } };
//门店的经纬度
Double[] initlocal = {31.1221751783,121.5011213954 }; for (int i = 0; i < doubles.length; i++) {
System.out.println("(" + doubles[i][0] + "," + doubles[i][1] + ")");
Double z = test3.GetShotLocal(doubles[i][0], doubles[i][1],initlocal[0], initlocal[1]);
System.out.println(z);
//获取最短距离后把经纬度和距离存放到对象中
LocalAddress localaddress = new LocalAddress(doubles[i][0], doubles[i][1], z);
//将对象用list保存
ilist.add(localaddress);
} List<LocalAddress> shotlocal = getLocalList();
Double lat=shotlocal.get(0).getLat();
Double lon= shotlocal.get(0).getLon();
localDouble = shotlocal.get(0).getDistance();
System.err.println("最近的距离：" + localDouble + "。对应的经纬是：" +"(" + lat + "," + lon + ")");
} /**
* 获取最短的距离
* @param lat
* @param lon
* @param initlat
* @param initlon
* @return
*/
public Double GetShotLocal(Double lat, Double lon, Double initlat,Double initlon) {
Double x = (initlat - lat) * (initlat - lat);
Double y = (initlon - lon) * (initlon - lon);
Double z = Math.sqrt(x + y);
return z;
} /**
* 对List<LocalAddress> 进行排序
* @return
*/
public static List<LocalAddress> getLocalList() {
Collections.sort(ilist, new Comparator<LocalAddress>() {
@Override
public int compare(LocalAddress arg0, LocalAddress arg1) {
Double double1 = arg0.getDistance();
Double double2 = arg1.getDistance();
if(double1>double2){
return 1;
}else if (double1 == double2) {
return 0;
}else {
return -1;
}
}
});
return ilist;
}
} LocalAddress类： package com.zjj.Entity; public class LocalAddress { private Double lat;
private Double lon;
private Double distance; public LocalAddress() {
// TODO Auto-generated constructor stub
} public LocalAddress(Double lat, Double lon, Double distance) {
super();
this.lat = lat;
this.lon = lon;
this.distance = distance;
}
public Double getLat() {
return lat;
}
public void setLat(Double lat) {
this.lat = lat;
}
public Double getLon() {
return lon;
}
public void setLon(Double lon) {
this.lon = lon;
}
public Double getDistance() {
return distance;
}
public void setDistance(Double distance) {
this.distance = distance;
} }
4.效果：
为了方便查看效果这里给出两组简单数据，代码中是真实经纬度。