GeoTools introduction, installation environment, read and display file shp

GeoTools is an open source (LGPL) Java code library, which provides a standard way to handle geospatial data, such as geographic information systems to achieve (GIS). GeoTools library implements Open Geospatial Consortium (OGC) specifications.

Geotools provides a variety of GIS algorithms, to read and write, and displays various data formats.
In the display area to be worse, but with Swing achieve a map viewing and simple operation.
Users can implement their own map visualization algorithm based on Geotools provided. OpenJump and udig is based on the Geotools.
Most of the current open-source software, such as udig, geoserver such as the handling of spatial data are supported by the geotools do.
web services, desktop applications and command line tools can be implemented by geotools.
Is built on OGC standards, OGC is an idea implementation. The OGC is an international standard, so geotools the future will become the main tool for open source spatial data processing,
Two of the more important open source GIS toolkit is used Geotools JTS and GeoAPI. The former is to achieve a variety of GIS topology algorithm, it is also based on the GeoAPI.
Geotools now only based 2D graphics, lack of support for spatial data algorithms and 3D display.

Geotools supported data formats

arcsde, arcgrid, geotiff, grassraster, gtopo30, image(JPEG, TIFF, GIF, PNG),imageio-ext-gdal, imagemoasaic, imagepyramid, JP2K,matlab；
Supported databases "jdbc-ng": db2, h2, mysql, oracle, postgis, spatialite, sqlserver;
支持的矢量格式和数据访问：app-schema, arcsde, csv, dxf, edigeo, excel,geojson,org, property, shapefile, wfs；
XML绑定。基于xml的Java数据结构和绑定提供了如下格式xsd-core (xml simple types),fes,filter, gml2, gml3, kml, ows, sld, wcs, wfs, wms, wps, vpf。对于额外的geometry、sld和filter的编码和解析可以通过dom和sax程序。

支持大部分的OGC标准
OGC中的sld/SE和渲染引擎；
OGC一般要素模型包括简单要素支持；
OGC中栅格信息的网格影像表达；
OGC中WFS，WMS和额外的WPS；
ISO 19107 geometry规范；

Geotools依赖的开源项目

JTS：JTS是加拿大的 Vivid Solutions 做的一套开放源码的 Java API。它提供了一套空间数据操作的核心算法,为在兼容OGC标准的空间对象模型中进行基础的几何操作提供2D空间谓词API。
GeoAPI：GeoAPI为OpenGIS规范提供一组Java接口。

环境搭建

在本文最后的github项目中有安装介绍和遇到的坑。

第一个demo

其实就是官网的入门案例。查看本文下面的 github中的源码也可以。

package com.tutorial.quickstart;
 
/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2019, Open Source Geospatial Foundation (OSGeo)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
*/
 
 
import org.geotools.data.FileDataStore;
import org.geotools.data.FileDataStoreFinder;
import org.geotools.data.simple.SimpleFeatureSource;
import org.geotools.map.FeatureLayer;
import org.geotools.map.Layer;
import org.geotools.map.MapContent;
import org.geotools.styling.SLD;
import org.geotools.styling.Style;
import org.geotools.swing.JMapFrame;
import org.geotools.swing.data.JFileDataStoreChooser;
 
import java.io.File;
import java.io.IOException;
 
/**
* Prompts the user for a shapefile and displays the contents on the screen in a map frame.
*
* <p>This is the GeoTools Quickstart application used in documentationa and tutorials. *
*/
public class Quickstart {
 
/**
* GeoTools Quickstart demo application. Prompts the user for a shapefile and displays its
* contents on the screen in a map frame
*/
public static void main(String[] args) {
// display a data store file chooser dialog for shapefiles
File file = JFileDataStoreChooser.showOpenFile("shp", null);
if (file == null) {
return;
}
 
// "data/CHN_adm_shp/CHN_adm0.shp"
// String path = "data/ne_50m_admin_0_countries/ne_50m_admin_0_countries.shp";
 
// File file = new File(path);
 
// FileDataStoreFinder
// 可以使我们轻松处理文件。另一种处理方法是使用连接参数映射。这种技术使我们对使用shapefile的方式有了更多的控制，
// 还使我们可以连接到数据库和Web功能服务器。
FileDataStore store = null;
try {
store = FileDataStoreFinder.getDataStore(file);
} catch (IOException e) {
e.printStackTrace();
}
SimpleFeatureSource featureSource = null;
try {
featureSource = store.getFeatureSource();
} catch (IOException e) {
e.printStackTrace();
}
 
// Create a map content and add our shapefile to it
MapContent map = new MapContent();
map.setTitle("Quickstart");
 
 
 
Style style = SLD.createSimpleStyle(featureSource.getSchema());
 
 
Layer layer = new FeatureLayer(featureSource, style);
map.addLayer(layer);
 
// Now display the map
JMapFrame.showMap(map);
}
 
 
}

关注geotools-book查看源码和介绍。

本文参考

Geotools应用简要指南

原文链接：GIS之家小专栏

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