最常用的两种坐标4326 3857转换

第一种方法

CoordinateReferenceSystem sourceCRS = CRS.decode("EPSG:4326");

CoordinateReferenceSystem targetCRS = CRS.decode("EPSG:3857");

MathTransform transform = CRS.findMathTransform(sourceCRS, targetCRS);

Coordinate coorDst=new Coordinate();

JTS.transform(new Coordinate(40, 116),coorDst, transform);

System.out.println(coorDst);

第二种方法

CoordinateReferenceSystem sourceCrs = CRS.decode("EPSG:4326");

CoordinateReferenceSystem targetCrs = CRS.decode("EPSG:3857");

boolean lenient = true;

MathTransform mathTransform = CRS.findMathTransform(sourceCrs, targetCrs, lenient);

DirectPosition2D srcDirectPosition2D = new DirectPosition2D(sourceCrs, 40, 116);//bj

DirectPosition2D destDirectPosition2D = new DirectPosition2D();

mathTransform.transform(srcDirectPosition2D, destDirectPosition2D);

double transX = destDirectPosition2D.x;

double transY = destDirectPosition2D.y;

System.out.println(transX);

System.out.println(transY);

补充下

CoordinateReferenceSystem sourceCrs = CRS.decode("EPSG:4326");

System.out.println(sourceCrs.toWKT());

System.out.println(DefaultGeographicCRS.WGS84.toWKT());

GEOGCS["WGS 84",

  DATUM["World Geodetic System 1984",

    SPHEROID["WGS 84", 6378137.0, 298.257223563, AUTHORITY["EPSG","7030"]],

    AUTHORITY["EPSG","6326"]],

  PRIMEM["Greenwich", 0.0, AUTHORITY["EPSG","8901"]],

  UNIT["degree", 0.017453292519943295],

  AXIS["Geodetic latitude", NORTH],

  AXIS["Geodetic longitude", EAST],

  AUTHORITY["EPSG","4326"]]

==============================================

GEOGCS["WGS84(DD)",

  DATUM["WGS84",

    SPHEROID["WGS84", 6378137.0, 298.257223563]],

  PRIMEM["Greenwich", 0.0],

  UNIT["degree", 0.017453292519943295],

  AXIS["Geodetic longitude", EAST],

  AXIS["Geodetic latitude", NORTH]]