java 使用 geotools 将 shp 文件（zip压缩包）转换为 geoJson 格式

步骤0：你也可以参考这篇文章 ：java实现geojson格式数据与shp文件相互转换

步骤1：引入引入geotools工具。

步骤2：编写工具类，获取shp的zip文件。

步骤3：编写工具类，解析shp文件成为jsonObject （geoJson）。

步骤4：拿到你的jsonObject，供你使用。

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步骤1：引入geotools工具，笔者全网找半天也没在中文局域网里找到引入的方法，而是在公司同事的pom文件找到了：

<!--    shp文件解析 开始    -->
        <dependency>
            <groupId>org.geotools</groupId>
            <artifactId>gt-shapefile</artifactId>
            <version>19.2</version>
        </dependency>
        <dependency>
            <groupId>org.ejml</groupId>
            <artifactId>ejml-ddense</artifactId>
            <version>0.39</version>
        </dependency>
        <dependency>
            <groupId>org.ejml</groupId>
            <artifactId>ejml-core</artifactId>
            <version>0.39</version>
        </dependency>
        <dependency>
            <groupId>org.geotools</groupId>
            <artifactId>gt-opengis</artifactId>
            <version>19.2</version>
        </dependency>
        <dependency>
            <groupId>org.geotools</groupId>
            <artifactId>gt-data</artifactId>
            <version>19.2</version>
        </dependency>
        <dependency>
            <groupId>org.geotools</groupId>
            <artifactId>gt-api</artifactId>
            <version>19.2</version>
        </dependency>
        <dependency>
            <groupId>org.geotools</groupId>
            <artifactId>gt-main</artifactId>
            <version>19.2</version>
        </dependency>
        <dependency>
            <groupId>org.geotools</groupId>
            <artifactId>gt-metadata</artifactId>
            <version>19.2</version>
        </dependency>
        <dependency>
            <groupId>org.geotools</groupId>
            <artifactId>gt-referencing</artifactId>
            <version>19.2</version>
        </dependency>
        <dependency>
            <groupId>org.geotools</groupId>
            <artifactId>gt-geojson</artifactId>
            <version>19.2</version>
        </dependency>
        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
            <version>2.8.5</version>
        </dependency>
        <dependency>
            <groupId>javax.measure</groupId>
            <artifactId>jsr-275-1.0-beta</artifactId>
            <version>2</version>
        </dependency>
        <dependency>
            <groupId>com.vividsolutions</groupId>
            <artifactId>jts</artifactId>
            <version>1.13</version>
        </dependency>
        <dependency>
            <groupId>org.gavaghan</groupId>
            <artifactId>geodesy</artifactId>
            <version>1.1.3</version>
        </dependency>
        <!--    shp文件解析 结束    -->

你也可以参考来引入geotools：Maven中GeoTools的引入 - Maven 的 repository 与 mirror

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步骤2：编写工具类，编写获取shp的zip文件的方法getFeatureCollectionByShpFile（）。（该方法是为了将shp的zip压缩包解析后拿到FeatureCollection集合，其中需要自定义的 ZipUtil 解压到随机文件夹）

ShapeFileUtil工具类：

public class ShapeFileUtil {
    /*
     * @param zipFile: 压缩包文件地址
      * @return FeatureCollection
     * @author pangshicheng
     * @description 解析shp压缩包，并返回解析出的 FeatureCollection
     * @date 2023/7/18 16:02
     */
    public static FeatureCollection getFeatureCollectionByShpFile(File zipFile) throws IOException {
        try {
            String tempDir = FileUtil.getTempDirPath();
            File shapeDir = new File(tempDir + File.separator + new Date().getTime());
            shapeDir.mkdir();
            List<String> files = ZipUtil.unZipFiles(zipFile, shapeDir.getPath() + File.separator);
            String shapFileName = "";
            for (String fileName : files) {
                String suffix = fileName.substring(fileName.lastIndexOf(".") + 1);
                if ("shp".equals(suffix)) {
                    shapFileName = fileName;
                }
            }
            File shapeFile = new File(shapFileName);
            List<SimpleFeature> list = new ArrayList<>();
            Map<String, Object> shapeFileParams = new HashMap();
            shapeFileParams.put("url", shapeFile.toURI().toURL());
            // 设置编码
            shapeFileParams.put("charset", "GBK");
            DataStore dataStore = DataStoreFinder.getDataStore(shapeFileParams);
            if (dataStore == null) {
                throw new RuntimeException("couldn't load the damn data store: " + shapeFileParams);
            }
            String typeName = dataStore.getTypeNames()[0];
            FeatureSource<SimpleFeatureType, SimpleFeature> source = dataStore.getFeatureSource(typeName);
            Filter filter = Filter.INCLUDE;
            FeatureCollection<SimpleFeatureType, SimpleFeature> collection = source.getFeatures(filter);
            return collection;
        }catch (Exception e){
            throw e;
        }
    }
}

ZipUtil工具类：

/**
 * @author soulmate丶
 * @date 2021-10-26
 */
public class ZipUtil {

    private static final Logger log = LoggerFactory.getLogger(ZipUtil.class);
    /**
     * 保存zip文件到本地并调用解压方法并返回解压出的文件的路径集合
     *
     * @param file 文件
     * @return list //解压出的文件的路径合集
     */
    private static String zipPath = "f:/shpfile/";//zip根路径

    /**
     * zip解压
     *
     * @param srcFile     zip源文件
     * @param destDirPath 解压后的目标文件夹
     * @return list 解压文件的路径合集
     * @throws RuntimeException 解压失败会抛出运行时异常
     */
    public static List<String> unZipFiles(File srcFile, String destDirPath) throws RuntimeException {
        List<String> list = new ArrayList<>();
        long start = System.currentTimeMillis();
        // 判断源文件是否存在
        if (!srcFile.exists()) {
            throw new RuntimeException(srcFile.getPath() + "所指文件不存在");
        }
        // 开始解压
        ZipFile zipFile = null;
        try {
            zipFile = new ZipFile(srcFile, Charset.forName("GBK"));
            Enumeration<?> entries = zipFile.entries();
            while (entries.hasMoreElements()) {
                ZipEntry entry = (ZipEntry) entries.nextElement();
                log.info("解压" + entry.getName());
                // 如果是文件夹，就创建个文件夹
                if (entry.isDirectory()) {
                    String dirPath = destDirPath + File.separator + entry.getName();
                    File dir = new File(dirPath);
                    dir.mkdirs();
                } else {
                    // 如果是文件，就先创建一个文件，然后用io流把内容copy过去
                    File targetFile = new File(destDirPath + File.separator + entry.getName());
                    // 保证这个文件的父文件夹必须要存在
                    log.info(destDirPath + entry.getName());
                    list.add(destDirPath + entry.getName());
                    if (!targetFile.getParentFile().exists()) {
                        log.info("父文件不存在");
                    }
                    targetFile.createNewFile();
                    // 将压缩文件内容写入到这个文件中
                    InputStream is = zipFile.getInputStream(entry);
                    FileOutputStream fos = new FileOutputStream(targetFile);
                    int len;
                    byte[] buf = new byte[1024];
                    while ((len = is.read(buf)) != -1) {
                        fos.write(buf, 0, len);
                    }
                    // 关流顺序，先打开的后关闭
                    fos.close();
                    is.close();
                }
            }
            long end = System.currentTimeMillis();
            log.info("解压完成，耗时：" + (end - start) + " ms");
        } catch (Exception e) {
            throw new RuntimeException("unzip error from ZipUtils", e);
        } finally {
            if (zipFile != null) {
                try {
                    zipFile.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return list;
    }

    /**
     * @param filePath 临时文件的删除
     *                 删除文件夹里面子目录
     *                 再删除文件夹
     */
    public static void deleteFiles(String filePath) {
        File file = new File(filePath);
        if ((!file.exists()) || (!file.isDirectory())) {
            log.info("file not exist");
            return;
        }
        String[] tempList = file.list();
        File temp = null;
        for (int i = 0; i < tempList.length; i++) {
            if (filePath.endsWith(File.separator)) {
                temp = new File(filePath + tempList[i]);
            } else {
                temp = new File(filePath + File.separator + tempList[i]);
            }
            if (temp.isFile()) {
                temp.delete();
            }
            if (temp.isDirectory()) {
                deleteFiles(filePath + "\\" + tempList[i]);
            }
        }
        // 空文件的删除
        file.delete();
    }
}

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步骤3：在相同工具类编写方法shpToGeoJson（），解析shp文件成为jsonObject （geoJson）。

/**
     * @param zipFile:
      * @return JSONObject
     * @author pangshicheng
     * @description 通过shp压缩文件，将其转换为GeoJson格式
     * @date 2023/7/18 16:04
     */
    public static JSONObject shpToGeoJson(File zipFile) throws IOException {
        FeatureJSON fjson = new FeatureJSON();
        JSONObject geoJsonObject=new JSONObject();
        geoJsonObject.put("type","FeatureCollection");
        try {
            // 获取FeatureCollection
            FeatureCollection collection = getFeatureCollectionByShpFile(zipFile);

            FeatureIterator iterator = collection.features();
            List<JSONObject> array  = new ArrayList<JSONObject>();
            //遍历feature转为json对象
            while (iterator.hasNext()) {
                SimpleFeature feature = (SimpleFeature) iterator.next();
                StringWriter writer = new StringWriter();
                fjson.writeFeature(feature, writer);
                String temp = writer.toString();
                byte[] b = temp.getBytes("iso8859-1");
                temp = new String(b, "gbk");
                JSONObject json = JSONObject.parseObject(temp);
                array.add(json);
            }
            iterator.close();
            //添加到geojsonObject
            geoJsonObject.put("features",array);
            iterator.close();

        }catch (Exception e){
            throw e;
        }
        return geoJsonObject;
    }

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步骤4：拿到你的jsonObject，供你使用。