项目后台使用的坐标系是WGS1984，但是小程序使用的是腾讯地图。我想要将84坐标转化为具体的地址存储在数据库中，供小程序使用。就需要先将84-》腾讯地图使用的坐标系-》腾讯地图地址。
note：在网上找了很多实现的方法，大部分都没有啥用，各种报错，找到了比较好的是下面这种。
如果有疑惑，可以查看文章底部的源代码。
效果图如下：
1.关于坐标体系简介如下。代码大胆copy，一个都不用改。
因为感觉各种体系转换总有一天能用上，所以就都没删，需要哪个用copy哪个嘛。
WGS:国际上通用的地心坐标系。目前的设备包含GPS芯片获取的经纬度一般为WGS84地理坐标系。
谷歌卫星地图使用的就是WGS-84标准。
GCJ-02：国家测绘局的一套标准GCJ-02(国测局)，在WGS的基础上进行加密偏移。
谷歌街道地图、腾讯、高德地图使用该标准。
BD-09：百度在GCJ-02的基础上又进行了加密处理，形成了百度独有的BD-09坐标系。
package org.boot.city.utils; /** * GPS84、高德、百度、腾讯编码互转 */ public class LngLonUtil { public static double pi = 3.1415926535897932384626; public static double x_pi = 3.14159265358979324 * 3000.0 / 180.0; public static double a = 6378245.0; public static double ee = 0.00669342162296594323; public static double transformLat(double x, double y) { double ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y + 0.2 * Math.sqrt(Math.abs(x)); ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0; ret += (20.0 * Math.sin(y * pi) + 40.0 * Math.sin(y / 3.0 * pi)) * 2.0 / 3.0; ret += (160.0 * Math.sin(y / 12.0 * pi) + 320 * Math.sin(y * pi / 30.0)) * 2.0 / 3.0; return ret; } public static double transformLon(double x, double y) { double ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * Math.sqrt(Math.abs(x)); ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0; ret += (20.0 * Math.sin(x * pi) + 40.0 * Math.sin(x / 3.0 * pi)) * 2.0 / 3.0; ret += (150.0 * Math.sin(x / 12.0 * pi) + 300.0 * Math.sin(x / 30.0 * pi)) * 2.0 / 3.0; return ret; } public static double[] transform(double lat, double lon) { if (outOfChina(lat, lon)) { return new double[]{lat,lon}; } double dLat = transformLat(lon - 105.0, lat - 35.0); double dLon = transformLon(lon - 105.0, lat - 35.0); double radLat = lat / 180.0 * pi; double magic = Math.sin(radLat); magic = 1 - ee * magic * magic; double sqrtMagic = Math.sqrt(magic); dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi); dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi); double mgLat = lat + dLat; double mgLon = lon + dLon; return new double[]{mgLat,mgLon}; } /** * 判断是否在中国 * @param lat * @param lon * @return */ public static boolean outOfChina(double lat, double lon) { if (lon < 72.004 || lon > 137.8347) return true; if (lat < 0.8293 || lat > 55.8271) return true; return false; } /** * 84 ==》 高德/腾讯 * @param lat * @param lon * @return */ public static double[] gps84_To_Gcj02(double lat, double lon) { if (outOfChina(lat, lon)) { return new double[]{lat,lon}; } double dLat = transformLat(lon - 105.0, lat - 35.0); double dLon = transformLon(lon - 105.0, lat - 35.0); double radLat = lat / 180.0 * pi; double magic = Math.sin(radLat); magic = 1 - ee * magic * magic; double sqrtMagic = Math.sqrt(magic); dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi); dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi); double mgLat = lat + dLat; double mgLon = lon + dLon; return new double[]{mgLat, mgLon}; } /** * 高德/腾讯 ==》 84 * @param lon * @param lat * @return * */ public static double[] gcj02_To_Gps84(double lat, double lon) { double[] gps = transform(lat, lon); double lontitude = lon * 2 - gps[1]; double latitude = lat * 2 - gps[0]; return new double[]{latitude, lontitude}; } /** * 高德/腾讯 == 》 百度 * @param lat * @param lon */ public static double[] gcj02_To_Bd09(double lat, double lon) { double x = lon, y = lat; double z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y * x_pi); double theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * x_pi); double tempLon = z * Math.cos(theta) + 0.0065; double tempLat = z * Math.sin(theta) + 0.006; double[] gps = {tempLat,tempLon}; return gps; } /** * 百度 == 》 高德/腾讯 * @param lat * @param lon */ public static double[] bd09_To_Gcj02(double lat, double lon) { double x = lon - 0.0065, y = lat - 0.006; double z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * x_pi); double theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * x_pi); double tempLon = z * Math.cos(theta); double tempLat = z * Math.sin(theta); double[] gps = {tempLat,tempLon}; return gps; } /** * 84 == 》 百度 * @param lat * @param lon * @return */ public static double[] gps84_To_bd09(double lat,double lon){ double[] gcj02 = gps84_To_Gcj02(lat,lon); double[] bd09 = gcj02_To_Bd09(gcj02[0],gcj02[1]); return bd09; } /** * 百度 == 》 84 * @param lat * @param lon * @return */ public static double[] bd09_To_gps84(double lat,double lon){ double[] gcj02 = bd09_To_Gcj02(lat, lon); double[] gps84 = gcj02_To_Gps84(gcj02[0], gcj02[1]); //保留小数点后六位 gps84[0] = retain6(gps84[0]); gps84[1] = retain6(gps84[1]); return gps84; } /* * 保留小数点后六位 * @param num * @return */ private static double retain6(double num){ String result = String .format("%.6f", num); return Double.valueOf(result); } }
2.添加Gson依赖
<!-- https://mvnrepository.com/artifact/com.google.code.gson/gson --> <dependency> <groupId>com.google.code.gson</groupId> <artifactId>gson</artifactId> <version>2.8.6</version> </dependency>
3.腾讯坐标体系==》腾讯地图地址
package org.boot.city.utils; import com.google.gson.Gson; import java.io.BufferedReader; import java.io.InputStream; import java.io.InputStreamReader; import java.net.URL; import java.util.List; import java.util.Map; /** * 使用腾讯的接口获取的地理位置。 * */ public class GetLocationUtill { public static final String getAddr(double[] location) { // double lat = location.getLatitude(); // double log = location.getLongitude(); double lat = location[0]; double log = location[1]; double latlong[] = LngLonUtil.gps84_To_Gcj02(lat, log); StringBuilder sb = new StringBuilder(); InputStream in = null; BufferedReader reader = null; try { URL url = new URL("http://apis.map.qq.com/jsapi?qt=rgeoc&lnglat=" + latlong[1] + "," + latlong[0]); in = url.openStream(); reader = new BufferedReader(new InputStreamReader(in, "GBK")); String line = null; while ((line = reader.readLine()) != null) { sb.append(line); } } catch (Exception e) { System.out.println("URL" + e.getMessage()); } finally { try { in.close(); reader.close(); } catch (Exception e) { } } Map result = (Map) new Gson().fromJson(sb.toString(), Map.class); System.out.println(result); Map info = (Map) result.get("info"); String error = info.get("error").toString(); String addr = ""; if (error.equals("0.0")) { Map detail = (Map) result.get("detail"); List poilist = (List) detail.get("poilist"); Map p1 = (Map) poilist.get(0); addr = (String) p1.get("addr"); String name = (String) p1.get("name"); addr = addr + name; } return addr; } }
4.使用
//我的经纬度坐标p.getLat()是String类型，所以需要转成double一下
Sring result = GetLocationUtill.getAddr(LngLonUtil.gps84_To_Gcj02(Double.parseDouble(p.getLat()),Double.parseDouble(p.getLng())));
Gcj02体系==》腾讯地图地址：https://blog.csdn.net/H517604180/article/details/81477920
