转WGS84坐标系

 坐标网址:Beijing 1954 / Gauss-Kruger 21N - EPSG:21481

下面写的 String c2 里面的东西就是在官网里面找的,,我用的是这个21481,但是手动修改了一下,如果需要别的也可以去官网找,里面都有

不需要修改的,可以直接使用官网提供的EPSG:xxxx

所需依赖:

 <!--geotools-->
        <dependency>
            <groupId>org.geotools</groupId>
            <artifactId>gt-opengis</artifactId>
            <version>${geotools.version}</version>
        </dependency>
        <dependency>
            <groupId>org.geotools</groupId>
            <artifactId>gt-main</artifactId>
            <version>${geotools.version}</version>
        </dependency>
        <!--EOSG格式-->
        <dependency>
            <groupId>org.geotools</groupId>
            <artifactId>gt-epsg-hsql</artifactId>
            <version>${geotools.version}</version>
        </dependency>
        <dependency>
            <groupId>org.geotools</groupId>
            <artifactId>gt-epsg-extension</artifactId>
            <version>${geotools.version}</version>
        </dependency>
        <dependency>
            <groupId>org.geotools</groupId>
            <artifactId>gt-epsg-wkt</artifactId>
            <version>${geotools.version}</version>
        </dependency>
        <dependency>
            <groupId>org.hsqldb</groupId>
            <artifactId>hsqldb</artifactId>
            <version>2.5.2</version>
        </dependency>
        <dependency>
            <groupId>org.gdal</groupId>
            <artifactId>gdal</artifactId>
            <version>3.1.0</version>
        </dependency>

import org.geotools.referencing.CRS;
import org.locationtech.jts.io.ParseException;
import org.opengis.referencing.FactoryException;
import org.opengis.referencing.crs.CoordinateReferenceSystem;
import org.opengis.referencing.operation.MathTransform;
import org.opengis.referencing.operation.TransformException;

public class GeoUtil {

    public Coordinate getWGS84Yt(double srcLon, double srcLat) throws FactoryException, TransformException, ParseException {

        String sourceCRS = "EPSG:4326";
        String c2 ="PROJCS[\"unnamed\",\n" +
                "    GEOGCS[\"GRS 1980(IUGG, 1980)\",\n" +
                "        DATUM[\"unknown\",\n" +
                "            SPHEROID[\"GRS80\",6378137,298.2572221010002,\n" +
                "                AUTHORITY[\"EPSG\",\"7019\"]],\n" +
                "            AUTHORITY[\"EPSG\",\"6269\"]],\n" +
                "        PRIMEM[\"Greenwich\",0],\n" +
                "        UNIT[\"degree\",0.0174532925199433],\n" +
                "        AXIS[\"Geodetic longitude\",EAST],\n" +
                "        AXIS[\"Geodetic latitude\",NORTH],\n" +
                "        AUTHORITY[\"EPSG\",\"4269\"]],\n" +
                "    PROJECTION[\"Transverse_Mercator\"],\n" +
                "    PARAMETER[\"latitude_of_origin\",0],\n" +
                "    PARAMETER[\"central_meridian\",120],\n" +
                "    PARAMETER[\"scale_factor\",1],\n" +
                "    PARAMETER[\"false_easting\",499040],\n" +
                "    PARAMETER[\"false_northing\",-720],\n" +
                "    UNIT[\"meters\",1],\n" +
                "    AXIS[\"Easting\",EAST],\n" +
                "    AXIS[\"Northing\",NORTH]]";
        CoordinateReferenceSystem sourceCRSObj = CRS.decode(sourceCRS);
        CoordinateReferenceSystem targetCRSObj = CRS.parseWKT(c2);
/*        CoordinateReferenceSystem targetCRSObj = CRS.decode("EPSG:4549");*/
        // 定义待转换坐标点
/*        double srcLon = 37.42318; //x
        double srcLat = 121.249782; //y*/
        double[] srcCoords = new double[]{srcLat, srcLon};


        MathTransform transform = CRS.findMathTransform(sourceCRSObj, targetCRSObj, true);
        double[] tgtCoords = new double[2];
        transform.transform(srcCoords, 0, tgtCoords, 0, 1);

        // 打印转换结果
/*        System.out.println("Source Coordinates: " + srcLon + ", " + srcLat);
        System.out.println("Target Coordinates: " + tgtCoords[0] + ", " + tgtCoords[1]);*/
        return new Coordinate(tgtCoords[0], tgtCoords[1]);
    }

调用:

  @PostMapping("/getWGS84Yt")
    public Result<Coordinate> getWGS84Yt(@RequestParam("lon") double lon,
                                         @RequestParam("lat") double lat) throws FactoryException, ParseException, TransformException {
        return Result.success(new GeoUtil().getWGS84Yt(lon, lat));
    }