【GeoTools】geotools-20 读取、写入shape文件

shape文件至少包含shp、dbf、shx文件，否则会报错。shp文件存储地理空间信息；dbf文件存储属性信息；shx文件存储索引信息。

注意：关于import org.locationtech.jts.geom.Geometry和import com.vividsolutions.jts.geom.Geometry前者是新版本所采用的JTS，后者是老版本采用的JTS，你要采用像geotools的20版本，用前者；用geotool的18版本以前的用后者。否则会报错。
 

1，读取shape文件：

public static void readShapefile() throws IOException{
        String shapefile = "E:\\supermap_data\\lalala\\my.shp";
        File file = new File(shapefile);
        // 申明一个存储空间
        ShapefileDataStore shapDataStore = null;
        // 将文件读取到工作空间
        shapDataStore = new ShapefileDataStore(file.toURL());
        // 设置编码，防止中文乱码
        Charset charset = Charset.forName("GBK");
        shapDataStore.setCharset(charset);
        // 获取图层名称
        String typeName = shapDataStore.getTypeNames()[0];
        System.out.println(typeName);
        SimpleFeatureSource featureSource = null;
        // 根据图层名称来获取要素的source
        featureSource = shapDataStore.getFeatureSource(typeName);
        // 获取要素集
        SimpleFeatureCollection result = featureSource.getFeatures();
        // 获取要素集合，方便进行迭代读取每一个要素
        SimpleFeatureIterator iterator = result.features();
        while (iterator.hasNext()){
            // 获取每一个要素
            SimpleFeature feature = iterator.next();
            System.out.println(feature.getID() + " " + feature.getDefaultGeometry());
        }
    }

2，写入shape文件

 public static void writeShapefile() throws SchemaException, IOException {
        String path="E:\\supermap_data\\lalala\\my.shp";
        //1.创建shape文件对象
        File file =new File(path);
        Map params = new HashMap();
        //用于捕获参数需求的数据类
        //URLP:url to the .shp file.
        params.put(ShapefileDataStoreFactory.URLP.key, file.toURI().toURL());
        //2.创建一个新的数据存储——对于一个还不存在的文件。
        ShapefileDataStore ds = (ShapefileDataStore) new ShapefileDataStoreFactory().createNewDataStore(params);
        //3.定义图形信息和属性信息
        //SimpleFeatureTypeBuilder 构造简单特性类型的构造器
        SimpleFeatureTypeBuilder tBuilder = new SimpleFeatureTypeBuilder();
        //设置
        //WGS84:一个二维地理坐标参考系统，使用WGS84数据
//        tBuilder.setCRS(DefaultGeographicCRS.WGS84);
        // 需要添加 gt-epsg-hsql 架包
        tBuilder.setSRS( "EPSG:4490" );

        tBuilder.setName("shapefile");
        //添加 一个点
        tBuilder.add("the_geom", Point.class);
        //添加一个id
        tBuilder.add("osm_id", Long.class);
        //添加名称
        tBuilder.add("name", String.class);
        //添加描述
        tBuilder.add("des", String.class);
        //设置此数据存储的特征类型
        ds.createSchema(tBuilder.buildFeatureType());
        //设置编码
        ds.setCharset(Charset.forName("UTF-8"));
        FeatureWriter writer = ds.getFeatureWriter(ds.getTypeNames()[0], Transaction.AUTO_COMMIT);
        SimpleFeature feature = writer.next();
        double x = 116.123; //X轴坐标
        double y = 39.345 ; //Y轴坐标
        Coordinate coordinate = new Coordinate(x, y);
        Point point = new GeometryFactory().createPoint(coordinate);
        feature.setAttribute("the_geom",point);
        feature.setAttribute("osm_id", 1234567890l);
        feature.setAttribute("name", "帅哥");
        feature.setAttribute("des", "爱美女");

        feature = writer.next();
        x = 116.456;
        y = 39.678 ;
        coordinate = new Coordinate(x, y);
        point = new GeometryFactory().createPoint(coordinate);
        feature.setAttribute("the_geom",point);
        feature.setAttribute("osm_id", 1234567891l);
        feature.setAttribute("name", "美女");
        feature.setAttribute("des", "爱帅哥");
        writer.write();
        writer.close();
        ds.dispose();
    }

 

3，使用的是geotools-20.2，maven配置文件如下：

        UTF-8
        20.2
    

    
        
            org.geotools
            gt-shapefile
            ${geotools.version}
        

        
            org.geotools
            gt-swing
            ${geotools.version}
        

        
            org.geotools
            gt-geojson
            ${geotools.version}
        

        
            org.geotools
            gt-main
            ${geotools.version}
        

        
            org.geotools.jdbc
            gt-jdbc-postgis
            ${geotools.version}
        

        
            org.geotools
            gt-epsg-hsql
            ${geotools.version}
        

    

    
        
            osgeo
            Open Source Geospatial Foundation Repository
            http://download.osgeo.org/webdav/geotools/
        
        
            
                true
            
            opengeo
            OpenGeo Maven Repository
            http://repo.opengeo.org
        
    

参考博客：

1，Java+GeoTools工具包+读写shapfile文件

https://www.giserdqy.com/secdev/geotools/27801/

 

好的博文：

1，PostGIS的安装与初步使用

https://blog.csdn.net/qq_35732147/article/details/81169961

2，Windows环境下GeoTools 连接PostGIS时候一些坑

https://blog.csdn.net/chajizhuo3103/article/details/80353056

3，geotools中的空间关系（Geometry Relationships）和空间操作（Geometry Operations）

https://blog.csdn.net/gisshixisheng/article/details/56302250

4，geotools实现两个shp的相交计算

https://www.jianshu.com/p/08c78e00b7a8

5，postgis与geotools对应方法总结

https://blog.csdn.net/lnxyangruosong/article/details/80888808

6，GeoTools应用-JTS(Geometry之间的关系)

https://blog.csdn.net/sxausgyy/article/details/8113077

7，Geometry 点线面生成方式

https://www.iteye.com/blog/491569462-qq-com-2071793