Example of a method for Java to read and write Shapefile with Gdal _java

Gdal Introduction

GDAL (Geospatial Data Abstraction Library) is an open source raster space Data Transformation database under the X/mit license agreement. It uses an abstract data model to express the various file formats that are supported. It also has a series of command-line tools for data conversion and processing.

Gdal official website: http://www.gdal.org/, it can support the current popular map data format, including grid and vector map, specific reference to the official website. The library uses C/s + + development, in Java to use the need to compile their own, the specific compilation process here will not say, the following to see the main content of this article.

Examples of Java methods for using Gdal to read and write Shapefile

Read the SHP file and convert it to JSON

Import org.gdal.ogr.*;
Import Org.gdal.ogr.Driver;
Import org.gdal.gdal.*;

public class Gdalshptest {public
 static void Main (string[] args) {
  //register all drive
  ogr. RegisterAll ();
  To support the Chinese path, add the following code,
  gdal. Setconfigoption ("Gdal_filename_is_utf8", "yes");
  To enable the Property table field to support Chinese, add the following sentence,
  Gdal. Setconfigoption ("shape_encoding", "");

  String strvectorfile = "d:\\test\\node.shp";
  Open File
  DataSource ds = ogr. Open (strvectorfile,0);
  if (ds = = null)
  {
   System.out.println ("Open file failed!") " );
   return;
  }
  System.out.println ("Open file succeeded!") " );
  Driver dv = ogr. Getdriverbyname ("Geojson");
  if (dv = null)
  {
   System.out.println ("Open drive failed!") " );
   return;
  }
  SYSTEM.OUT.PRINTLN ("Open drive success!") " );
  Dv. Copydatasource (ds, "D:\\test\\node.json");
  SYSTEM.OUT.PRINTLN ("Conversion successful!") " );
 }
}

Write shp file

Import org.gdal.ogr.*;
Import org.gdal.gdal.*;
  Class WriteShp2 {public static void main (string[] args) {WriteShp2 readshpobj = new WriteShp2 ();
 Readshpobj.writevectorfile ();

  The static void Writevectorfile () {String strvectorfile = "d:\\test\\test.shp"; Ogr.
  RegisterAll (); Gdal.
  Setconfigoption ("Gdal_filename_is_utf8", "NO"); Gdal.

  Setconfigoption ("shape_encoding", "CP936");
  String strdrivername = "ESRI Shapefile"; Org.gdal.ogr.Driver odriver = ogr.
  Getdriverbyname (Strdrivername); if (Odriver = null) {System.out.println (strvectorfile +) driver is not available!
   \ n ");
  Return
  DataSource ODS = Odriver.createdatasource (strvectorfile, NULL); if (ODS = = null) {System.out.println ("Create vector file" "+ Strvectorfile +" "Failed!)
   \ n ");
  Return
  } Layer Olayer = Ods.createlayer ("Testpolygon", NULL, Ogr.wkbpolygon, NULL); if (Olayer = = null) {SYSTEM.OUT.PRINTLN ("Layer creation failed!")
   \ n ");
  Return Create a property sheet//Below create an integer attribute called FieldID fielddefn ofieldid = new Fielddefn ("FieldID",Ogr.
  Oftinteger);

  Olayer.createfield (Ofieldid); Then create a character-type attribute called FeatureName, with a character length of fielddefn ofieldname = new Fielddefn ("FieldName", ogr.
  oftstring);
  Ofieldname.setwidth (100);

  Olayer.createfield (Ofieldname);

  Featuredefn odefn = Olayer.getlayerdefn ();
  Create triangle elements Feature Ofeaturetriangle = new Feature (ODEFN);
  Ofeaturetriangle.setfield (0, 0);
  Ofeaturetriangle.setfield (1, "triangle");
  Geometry Geomtriangle = geometry.createfromwkt ("POLYGON ((0 0,20 0,10 15,0 0)");
  Ofeaturetriangle.setgeometry (Geomtriangle);

  Olayer.createfeature (Ofeaturetriangle);
  Create a rectangular element Feature Ofeaturerectangle = new Feature (ODEFN);
  Ofeaturerectangle.setfield (0, 1);
  Ofeaturerectangle.setfield (1, "rectangular");
  Geometry Geomrectangle = geometry.createfromwkt ("POLYGON ((30 0,60 0,60 30,30 30,30 0)");
  Ofeaturerectangle.setgeometry (Geomrectangle);

  Olayer.createfeature (Ofeaturerectangle);
  Create five angular elements Feature Ofeaturepentagon = new Feature (ODEFN);
  Ofeaturepentagon.setfield (0, 2); OfeatuRepentagon.setfield (1, "V-shaped");
  Geometry Geompentagon = geometry.createfromwkt ("POLYGON ((70 0,85 0,90 15,80 30,65 15,70 0)");
  Ofeaturepentagon.setgeometry (Geompentagon);

  Olayer.createfeature (Ofeaturepentagon);
  Ods.synctodisk (); System.out.println ("\ n data set creation complete!
 \ n "); }
}

Get test.dbf, test.shp, Test.shx.

TEST.DBF is as follows:

Open the shape as follows

Summarize

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