geoserver发布geojson格式的shp文件的java代码

你可以使用 GeoTools 库来实现将 SHP 文件发布为 GeoJSON 格式的服务。下面是一个示例代码：

import org.geoserver.catalog.Catalog;
import org.geoserver.catalog.CoverageStoreInfo;
import org.geoserver.catalog.DataStoreInfo;
import org.geoserver.catalog.FeatureTypeInfo;
import org.geoserver.catalog.NamespaceInfo;
import org.geoserver.catalog.StoreInfo;
import org.geoserver.catalog.WorkspaceInfo;
import org.geoserver.catalog.impl.CatalogImpl;
import org.geoserver.data.util.IOUtils;
import org.geoserver.platform.GeoServerExtensions;
import org.geoserver.wfs.WFSServiceImpl;
import org.geotools.data.DataStore;
import org.geotools.data.DataStoreFinder;
import org.geotools.data.FeatureSource;
import org.geotools.data.FeatureStore;
import org.geotools.data.Transaction;
import org.geotools.data.simple.SimpleFeatureCollection;
import org.geotools.data.simple.SimpleFeatureSource;
import org.geotools.data.simple.SimpleFeatureStore;
import org.geotools.feature.FeatureCollection;
import org.geotools.geojson.feature.FeatureJSON;
import org.geotools.geometry.jts.ReferencedEnvelope;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.opengis.feature.Property;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;
import org.opengis.filter.Filter;
import org.opengis.referencing.crs.CoordinateReferenceSystem;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletRequest;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;

@RestController
@RequestMapping("/geojson")
public class GeoJSONController {

    private Catalog catalog;

    public GeoJSONController() {
        this.catalog = new CatalogImpl();
    }

    @RequestMapping(value = "/{workspace}/{datastore}/{layer}", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE)
    public ResponseEntity<String> getGeoJSON(@PathVariable("workspace") String workspaceName,
                                              @PathVariable("datastore") String datastoreName,
                                              @PathVariable("layer") String layerName,
                                              HttpServletRequest request) {
        try {
            WorkspaceInfo workspace = catalog.getWorkspaceByName(workspaceName);
            DataStoreInfo dataStore = catalog.getDataStoreByName(datastoreName, workspace);
            FeatureTypeInfo featureType = catalog.getFeatureTypeByName(workspaceName, layerName);

            DataStore datastore = DataStoreFinder.getDataStore(dataStore.getConnectionParameters());
            SimpleFeatureSource featureSource = datastore.getFeatureSource(featureType.getName());
            FeatureCollection<SimpleFeatureType, SimpleFeature> collection = featureSource.getFeatures();
            SimpleFeatureCollection features = (SimpleFeatureCollection) collection;

            // Convert SimpleFeatureCollection to GeoJSON
            FeatureJSON featureJSON = new FeatureJSON();
            ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
            featureJSON.writeFeatureCollection(features, outputStream);

            return ResponseEntity.ok(outputStream.toString());
        } catch (Exception e) {
            return ResponseEntity.status(500).body("Error: " + e.getMessage());
        }
    }
}

在此代码中，我们首先获取了指定的工作空间、数据存储和要素类型。然后，我们使用 `DataStoreFinder` 类创建一个 `DataStore` 实例，并从中获取要素源。接下来，我们使用 GeoTools 库的 `FeatureJSON` 类将 `SimpleFeatureCollection` 转换为 GeoJSON 字符串，并返回该字符串作为响应。