众所周知Geotools作为开源的Java GIS三方库，已经成为GIS服务器端的主流开源库，其功能非常强大，涉及到GIS业务的方方面面，其中就包括GIS数据的读写，今天小编就借助Geotools来实现shape数据的写入。

Geotools对于shape数据写入，主要提供了SimpleFeatureStore和FeatureWriter两个主要操作类，下面小编就根据这两个类实现shape数据的写入，废话不多说，直接上代码：

import org.geotools.data.*;
import org.geotools.data.shapefile.ShapefileDataStore;
import org.geotools.data.shapefile.ShapefileDataStoreFactory;
import org.geotools.data.simple.SimpleFeatureCollection;
import org.geotools.data.simple.SimpleFeatureIterator;
import org.geotools.data.simple.SimpleFeatureSource;
import org.geotools.data.simple.SimpleFeatureStore;
import org.opengis.feature.simple.SimpleFeature;

import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.nio.charset.Charset;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

public class ShapwWriterTest {

public static void main(String\[\] args) throws IOException {  
    File file = new File("D:\\\\data\\\\line\_sheng.shp");  
    ShapefileDataStore shapefileDataStore = new ShapefileDataStore(file.toURI().toURL());  
    SimpleFeatureSource simpleFeatureSource = shapefileDataStore.getFeatureSource();  
    int count = simpleFeatureSource.getFeatures().size();  
    for(int i = 0;i<2; i++){  
        //分批插入(没啥逻辑，主要是验证多次写入同一个shp)  
        Query query = createQuery(i\*(count / 2),count / 2);  
        SimpleFeatureCollection simpleFeatureCollection = simpleFeatureSource.getFeatures(query);  
        addFeature2Shp(simpleFeatureCollection,"D:\\\\data\\\\line\_sheng\_1.shp");  
    }  
}

/\*\*  
 \* 将simplefearurecollection写入目标shape  
 \* @param simpleFeatureCollection  
 \* @param filePath  
 \* @throws IOException  
 \*/  
public static void addFeature2Shp(SimpleFeatureCollection simpleFeatureCollection, String filePath) throws IOException {  
    File file = new File(filePath);  
    ShapefileDataStore shapefileDataStore = null;  
    if (file.exists()){  
        shapefileDataStore = (ShapefileDataStore) DataStoreFinder.getDataStore(Collections.singletonMap("url",file.toURI().toURL()));  
    }else{  
        ShapefileDataStoreFactory shapefileDataStoreFactory = new ShapefileDataStoreFactory();  
        shapefileDataStore = (ShapefileDataStore) shapefileDataStoreFactory.createNewDataStore(Collections.singletonMap("url",file.toURI().toURL()));  
        shapefileDataStore.setCharset(Charset.defaultCharset());  
        shapefileDataStore.createSchema(simpleFeatureCollection.getSchema());  
    }  
    //获取simplefeaturestore  
    writerFeature(simpleFeatureCollection, shapefileDataStore);  
    //writerFeature1(simpleFeatureCollection,shapefileDataStore);  
}

/\*\*  
 \* 使用SimpleFeatureStore写入shape文件  
 \* @param simpleFeatureCollection  
 \* @param shapefileDataStore  
 \* @throws IOException  
 \*/  
private static void writerFeature(SimpleFeatureCollection simpleFeatureCollection, ShapefileDataStore shapefileDataStore) throws IOException {  
    SimpleFeatureStore simpleFeatureStore = (SimpleFeatureStore) shapefileDataStore.getFeatureSource(shapefileDataStore.getTypeNames()\[0\]);  
    Transaction transaction = new DefaultTransaction("create");  
    simpleFeatureStore.setTransaction(transaction);  
    try {  
        simpleFeatureStore.addFeatures(simpleFeatureCollection);  
        transaction.commit();  
    } catch (Exception e) {  
        transaction.rollback();  
    } finally {  
        transaction.close();  
    }  
}

/\*\*  
 \* 使用FeatureWriter来写feature  
 \* @param simpleFeatureCollection  
 \* @param shapefileDataStore  
 \* @throws IOException  
 \*/  
private static void writerFeature1(SimpleFeatureCollection simpleFeatureCollection, ShapefileDataStore shapefileDataStore) throws IOException {  
    FeatureWriter featureWriter = shapefileDataStore.getFeatureWriterAppend(Transaction.AUTO\_COMMIT);  
    SimpleFeatureIterator simpleFeatureIterator = simpleFeatureCollection.features();  
    while(simpleFeatureIterator.hasNext()){  
        SimpleFeature simpleFeature = simpleFeatureIterator.next();  
        SimpleFeature simpleFeature1 = (SimpleFeature) featureWriter.next();  
        simpleFeature1.setAttributes(simpleFeature.getAttributes());  
    }  
    featureWriter.write();  
    featureWriter.close();  
    simpleFeatureIterator.close();  
}

private static Query createQuery(int startIndex,int queryCount){  
    Query query = new Query();  
    query.setStartIndex(startIndex);  
    query.setMaxFeatures(queryCount);  
    return query;  
}

/\*\*  
 \* 总结geotools 读取shape的几种方式  
 \*/  
private static void testReaderShape(String filePath) throws IOException {  
    //第一种方式  
    ShapefileDataStore shapefileDataStore = new ShapefileDataStore(new File(filePath).toURI().toURL());  
    /\*\*  
     \* 使用上述这种方式读shape的话，其中的很多参数都是默认的，最主要的是它的编码是StandardCharsets.ISO\_8859\_1  
     \* 因此我们需要单独设置下  
     \*/  
    shapefileDataStore.setCharset(Charset.forName("UTF-8"));

    //第二种ShapefileDataStoreFactory  
    ShapefileDataStoreFactory shapefileDataStoreFactory = new ShapefileDataStoreFactory();  
    Map<String,?> paramMap = new HashMap<>();  
    /\*\*  
     \* 通常有那些参数，我们可以通过下面的这个函数去查看，这里面  
     \*/  
    shapefileDataStoreFactory.createNewDataStore(paramMap);  
    //第三种方式，这种方式可适用于各种基于SPI模式的文件读写  
    DataStoreFinder.getDataStore(paramMap);  
}

}

好了，今天关于Geotools写入shape的代码就分享到这里，而关于shape文件的操作，还有很多内容，其中最主要的过滤(Filter)后续也会出个专题来记录下，毕竟这里的东西很多。