geotools学习

GeoTools Java 官网下载地址:

http://sourceforge.net/projects/geotools/files/

CSDN资源下载地址:http://download.csdn.net/detail/mike_caoyong/4529917

geotools学习1–org.geotools.demo例子FirstProject

/*<br /> * GeoTools – The Open Source Java GIS Tookit<br /> * http://geotools.org<br /> *<br /> * (C) 2006-2008, Open Source Geospatial Foundation (OSGeo)<br /> *<br /> * This file is hereby placed into the Public Domain. This means anyone is<br /> * free to do whatever they wish with this file. Use it well and enjoy!<br /> *<br /> *–程序分析说明<br /> *2009年7月12日<br /> *<br /> *<br /> *<br /> *<br /> */<br /> package org.geotools.demo;<br /> /*<br /> * 常用java包的引入<br /> */<br /> import java.io.File;<br /> import java.io.FileNotFoundException;<br /> import java.io.Serializable;<br /> import java.util.HashMap;<br /> import java.util.Map;<br /> /*<br /> * GUI界面包的引入<br /> */<br /> import javax.swing.JFileChooser;<br /> import javax.swing.filechooser.FileFilter;<br /> /*<br /> * geotools 包的引入<br /> */<br /> import org.geotools.data.DataStore;<br /> import org.geotools.data.DataStoreFinder;<br /> import org.geotools.data.FeatureSource;<br /> import org.geotools.factory.GeoTools;<br /> import org.geotools.feature.FeatureCollection;<br /> import org.geotools.feature.FeatureIterator;<br /> /*8<br /> * geoApi包的引入<br /> * GeoAPI为OpenGIS规范提供一组Java接口<br /> */<br /> import org.opengis.feature.simple.SimpleFeature;<br /> import org.opengis.feature.simple.SimpleFeatureType;<br /> /*<br /> * jts 包的引入<br /> */<br /> import com.vividsolutions.jts.geom.Geometry;<br /> /**<br /> * The example code for the “FirstProject” in the GeoTools wiki.<br /> * <p><br /> * This code matches these examples:<br /> * <ul><br /> * <li><a href=”http://docs.codehaus.org/display/GEOTDOC/03+First+Project” mce_href=”http://docs.codehaus.org/display/GEOTDOC/03+First+Project”>First Project</a><br /> * <li><a href=”http://docs.codehaus.org/display/GEOTDOC/04+How+to+Read+a+Shapefile” mce_href=”http://docs.codehaus.org/display/GEOTDOC/04+How+to+Read+a+Shapefile”>How to Read a Shapefile</a><br /> * </ul><br /> *<br /> * @author Jody Garnett<br /> */<br /> public class FirstProject {<br /> public static void main(String[] args) throws Exception {<br /> /*<br /> * 输入程序版本<br /> */<br /> System.out.println(“Welcome to GeoTools:” + GeoTools.getVersion());<br /> /*<br /> * 打开输入对话框<br /> */<br /> File file = promptShapeFile(args);<br /> try {<br /> // Connection parameters<br /> /*<br /> * 获取连接参数<br /> *<br /> */<br /> Map<String, Serializable> connectParameters = new HashMap<String, Serializable>();<br /> connectParameters.put(“url”, file.toURI().toURL());<br /> connectParameters.put(“create spatial index”, true);<br /> /*<br /> * 创建DataStore<br /> * DataStore为接口<br /> */<br /> DataStore dataStore = DataStoreFinder.getDataStore(connectParameters);<br /> // we are now connected<br /> String[] typeNames = dataStore.getTypeNames();<br /> String typeName = typeNames[0];<br /> System.out.println(“Reading content ” + typeName);<br /> /*<br /> * 图形信息<br /> * 比较复杂(需要仔细研究 )<br /> */<br /> FeatureSource<SimpleFeatureType, SimpleFeature> featureSource;<br /> FeatureCollection<SimpleFeatureType, SimpleFeature> collection;<br /> FeatureIterator<SimpleFeature> iterator;<br /> featureSource = dataStore.getFeatureSource(typeName);<br /> collection = featureSource.getFeatures();<br /> iterator = collection.features();<br /> double totalLength = 0.0;<br /> try {<br /> while (iterator.hasNext()) {<br /> SimpleFeature feature = iterator.next();<br /> /*<br /> * GeoMetry来自JavaTopologicalSuite<br /> */<br /> Geometry geometry = (Geometry) feature.getDefaultGeometry();<br /> totalLength += geometry.getLength();<br /> }<br /> } finally {<br /> if (iterator != null) {<br /> // YOU MUST CLOSE THE ITERATOR!<br /> iterator.close();<br /> }<br /> }<br /> System.out.println(“Total Length ” + totalLength);<br /> } catch (Exception ex) {<br /> ex.printStackTrace();<br /> System.exit(1);<br /> }<br /> System.exit(0);<br /> }<br /> /**<br /> * Prompt for File if not provided on the command line.<br /> * Don’t forget the quotes around your path if there are spaces!<br /> *<br /> * @throws FileNotFoundException<br /> * 打开shp文件对话框<br /> * 获取相关参数<br /> * 用到了两个重要的系统类<br /> * (1)FIle类<br /> * (2)JFileChooser类<br /> */<br /> private static File promptShapeFile(String[] args)<br /> throws FileNotFoundException {<br /> File file;<br /> /*<br /> *<br /> * 如果没有输入参数执行下面的代码<br /> */<br /> if (args.length == 0) {<br /> JFileChooser chooser = new JFileChooser();//文件对话框<br /> chooser.setDialogTitle(“Open Shapefile for Reprojection”);<br /> /*<br /> * FileFilter为抽象类<br /> * 需要实例化两个方法<br /> * (1)accept();<br /> * (2)getDescription();<br /> */<br /> chooser.setFileFilter(new FileFilter() {<br /> public boolean accept(File f) {<br /> return f.isDirectory() || f.getPath().endsWith(“shp”)<br /> || f.getPath().endsWith(“SHP”);<br /> }<br /> public String getDescription() {<br /> return “Shapefiles”;<br /> }<br /> });<br /> /*<br /> *打开对话框<br /> */<br /> int returnVal = chooser.showOpenDialog(null);</p> <p> /*<br /> * 判断是够选择了yes还是NO<br /> */<br /> if (returnVal != JFileChooser.APPROVE_OPTION) {<br /> System.exit(0);<br /> }</p> <p> file = chooser.getSelectedFile();<br /> /*<br /> * 成功输出正确的文件名<br /> */<br /> System.out.println(“You chose to open this file: ” + file.getName());<br /> } else {<br /> /*<br /> * 直接提供参数说明 *<br /> */<br /> file = new File(args[0]);<br /> }<br /> /*<br /> * 最后验证file是否存在<br /> * 如果不存在则显示抛出异常<br /> */<br /> if (!file.exists()) {<br /> throw new FileNotFoundException(file.getAbsolutePath());<br /> }<br /> return file;<br /> }<br /> } 

程序运行结果：

转载自：https://blog.csdn.net/mike_caoyong/article/details/7913849