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

[java]
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/*
* GeoTools - The Open Source Java GIS Tookit
* http://geotools.org *
* (C) 2006-2008, Open Source Geospatial Foundation (OSGeo)
*
* This file is hereby placed into the Public Domain. This means anyone is
* free to do whatever they wish with this file. Use it well and enjoy!
*
*--程序分析说明
*2009年7月12日
*
*
*
*
*/
package org.geotools.demo;
/*
* 常用java包的引入
*/
import java.io.File;
import java.io.FileNotFoundException;
import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;
/*
* GUI界面包的引入
*/
import javax.swing.JFileChooser;
import javax.swing.filechooser.FileFilter;
/*
* geotools 包的引入
*/
import org.geotools.data.DataStore;
import org.geotools.data.DataStoreFinder;
import org.geotools.data.FeatureSource;
import org.geotools.factory.GeoTools;
import org.geotools.feature.FeatureCollection;
import org.geotools.feature.FeatureIterator;
/*8
* geoApi包的引入
* GeoAPI为OpenGIS规范提供一组Java接口
*/
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;
/*
* jts 包的引入
*/
import com.vividsolutions.jts.geom.Geometry;
/**
* The example code for the "FirstProject" in the GeoTools wiki.
* <p>
* This code matches these examples:
* <ul>
* <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>
* <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>
* </ul>
*
* @author Jody Garnett
*/
public class FirstProject {
public static void main(String[] args) throws Exception {
/*
* 输入程序版本
*/
System.out.println("Welcome to GeoTools:" + GeoTools.getVersion());
/*
* 打开输入对话框
*/
File file = promptShapeFile(args);
try {
// Connection parameters
/*
* 获取连接参数
*
*/
Map<String, Serializable> connectParameters = new HashMap<String, Serializable>();
connectParameters.put("url", file.toURI().toURL());
connectParameters.put("create spatial index", true);
/*
* 创建DataStore
* DataStore为接口
*/
DataStore dataStore = DataStoreFinder.getDataStore(connectParameters);
// we are now connected
String[] typeNames = dataStore.getTypeNames();
String typeName = typeNames[0];
System.out.println("Reading content " + typeName);
/*
* 图形信息
* 比较复杂(需要仔细研究 )
*/
FeatureSource<SimpleFeatureType, SimpleFeature> featureSource;
FeatureCollection<SimpleFeatureType, SimpleFeature> collection;
FeatureIterator<SimpleFeature> iterator;
featureSource = dataStore.getFeatureSource(typeName);
collection = featureSource.getFeatures();
iterator = collection.features();
double totalLength = 0.0;
try {
while (iterator.hasNext()) {
SimpleFeature feature = iterator.next();
/*
* GeoMetry来自JavaTopologicalSuite
*/
Geometry geometry = (Geometry) feature.getDefaultGeometry();
totalLength += geometry.getLength();
}
} finally {
if (iterator != null) {
// YOU MUST CLOSE THE ITERATOR!
iterator.close();
}
}
System.out.println("Total Length " + totalLength);
} catch (Exception ex) {
ex.printStackTrace();
System.exit(1);
}
System.exit(0);
}
/**
* Prompt for File if not provided on the command line.
* Don't forget the quotes around your path if there are spaces!
*
* @throws FileNotFoundException
* 打开shp文件对话框
* 获取相关参数
* 用到了两个重要的系统类
* (1)FIle类
* (2)JFileChooser类
*/
private static File promptShapeFile(String[] args)
throws FileNotFoundException {
File file;
/*
*
* 如果没有输入参数执行下面的代码
*/
if (args.length == 0) {
JFileChooser chooser = new JFileChooser();//文件对话框
chooser.setDialogTitle("Open Shapefile for Reprojection");
/*
* FileFilter为抽象类
* 需要实例化两个方法
* (1)accept();
* (2)getDescription();
*/
chooser.setFileFilter(new FileFilter() {
public boolean accept(File f) {
return f.isDirectory() || f.getPath().endsWith("shp")
|| f.getPath().endsWith("SHP");
}
public String getDescription() {
return "Shapefiles";
}
});
/*
*打开对话框
*/
int returnVal = chooser.showOpenDialog(null);

/*
* 判断是够选择了yes还是NO
*/
if (returnVal != JFileChooser.APPROVE_OPTION) {
System.exit(0);
}

file = chooser.getSelectedFile();
/*
* 成功输出正确的文件名
*/
System.out.println("You chose to open this file: " + file.getName());
} else {
/*
* 直接提供参数说明 *
*/
file = new File(args[0]);
}
/*
* 最后验证file是否存在
* 如果不存在则显示抛出异常
*/
if (!file.exists()) {
throw new FileNotFoundException(file.getAbsolutePath());
}
return file;
}
}

/*
* GeoTools - The Open Source Java GIS Tookit
* http://geotools.org *
* (C) 2006-2008, Open Source Geospatial Foundation (OSGeo)
*
* This file is hereby placed into the Public Domain. This means anyone is
* free to do whatever they wish with this file. Use it well and enjoy!
*
*--程序分析说明
*2009年7月12日
*
*
*
*
*/
package org.geotools.demo;
/*
* 常用java包的引入
*/
import java.io.File;
import java.io.FileNotFoundException;
import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;
/*
* GUI界面包的引入
*/
import javax.swing.JFileChooser;
import javax.swing.filechooser.FileFilter;
/*
* geotools 包的引入
*/
import org.geotools.data.DataStore;
import org.geotools.data.DataStoreFinder;
import org.geotools.data.FeatureSource;
import org.geotools.factory.GeoTools;
import org.geotools.feature.FeatureCollection;
import org.geotools.feature.FeatureIterator;
/*8
* geoApi包的引入
* GeoAPI为OpenGIS规范提供一组Java接口
*/
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;
/*
* jts 包的引入
*/
import com.vividsolutions.jts.geom.Geometry;
/**
* The example code for the "FirstProject" in the GeoTools wiki.
* <p>
* This code matches these examples:
* <ul>
* <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>
* <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>
* </ul>
*
* @author Jody Garnett
*/
public class FirstProject {
public static void main(String[] args) throws Exception {
/*
* 输入程序版本
*/
System.out.println("Welcome to GeoTools:" + GeoTools.getVersion());
/*
* 打开输入对话框
*/
File file = promptShapeFile(args);
try {
// Connection parameters
/*
* 获取连接参数
*
*/
Map<String, Serializable> connectParameters = new HashMap<String, Serializable>();
connectParameters.put("url", file.toURI().toURL());
connectParameters.put("create spatial index", true);
/*
* 创建DataStore
* DataStore为接口
*/
DataStore dataStore = DataStoreFinder.getDataStore(connectParameters);
// we are now connected
String[] typeNames = dataStore.getTypeNames();
String typeName = typeNames[0];
System.out.println("Reading content " + typeName);
/*
* 图形信息
* 比较复杂(需要仔细研究 )
*/
FeatureSource<SimpleFeatureType, SimpleFeature> featureSource;
FeatureCollection<SimpleFeatureType, SimpleFeature> collection;
FeatureIterator<SimpleFeature> iterator;
featureSource = dataStore.getFeatureSource(typeName);
collection = featureSource.getFeatures();
iterator = collection.features();
double totalLength = 0.0;
try {
while (iterator.hasNext()) {
SimpleFeature feature = iterator.next();
/*
* GeoMetry来自JavaTopologicalSuite
*/
Geometry geometry = (Geometry) feature.getDefaultGeometry();
totalLength += geometry.getLength();
}
} finally {
if (iterator != null) {
// YOU MUST CLOSE THE ITERATOR!
iterator.close();
}
}
System.out.println("Total Length " + totalLength);
} catch (Exception ex) {
ex.printStackTrace();
System.exit(1);
}
System.exit(0);
}
/**
* Prompt for File if not provided on the command line.
* Don't forget the quotes around your path if there are spaces!
*
* @throws FileNotFoundException
* 打开shp文件对话框
* 获取相关参数
* 用到了两个重要的系统类
* (1)FIle类
* (2)JFileChooser类
*/
private static File promptShapeFile(String[] args)
throws FileNotFoundException {
File file;
/*
*
* 如果没有输入参数执行下面的代码
*/
if (args.length == 0) {
JFileChooser chooser = new JFileChooser();//文件对话框
chooser.setDialogTitle("Open Shapefile for Reprojection");
/*
* FileFilter为抽象类
* 需要实例化两个方法
* (1)accept();
* (2)getDescription();
*/
chooser.setFileFilter(new FileFilter() {
public boolean accept(File f) {
return f.isDirectory() || f.getPath().endsWith("shp")
|| f.getPath().endsWith("SHP");
}
public String getDescription() {
return "Shapefiles";
}
});
/*
*打开对话框
*/
int returnVal = chooser.showOpenDialog(null);

/*
* 判断是够选择了yes还是NO
*/
if (returnVal != JFileChooser.APPROVE_OPTION) {
System.exit(0);
}

file = chooser.getSelectedFile();
/*
* 成功输出正确的文件名
*/
System.out.println("You chose to open this file: " + file.getName());
} else {
/*
* 直接提供参数说明 *
*/
file = new File(args[0]);
}
/*
* 最后验证file是否存在
* 如果不存在则显示抛出异常
*/
if (!file.exists()) {
throw new FileNotFoundException(file.getAbsolutePath());
}
return file;
}
}

程序运行结果：