Elasticsearch 之（53） Java API 基于geo_shape根据坐标查找 坐标落在店铺范围的店铺

根据坐标查找 坐标落在店铺范围的店铺

构建mapping

PUT /example
{
    "mappings": {
        "doc": {
            "properties": {
                "location": {
                    "type": "geo_shape"                    
                }
            }
        }
    }
}

初始化数据

POST /example/doc
{
    "location" : {
        "type" : "polygon",
        "coordinates" : [
            [ [100.0, 0.0], [101.0, 0.0], [101.0, 1.0], [100.0, 1.0], [100.0, 0.0] ]
        ]
    }
}

上例中大量的方括号可能看起来让人困惑，不过实际上 GeoJSON 的语法非常简单：

1.     用一个数组表示 经纬度 坐标点：

   [lon,lat]

2. 一组坐标点放到一个数组来表示一个多边形：

   [[lon,lat],[lon,lat], ... ]

3. 一个多边形（ polygon ）形状可以包含多个多边形；第一个表示多边形的外轮廓，后续的多边形表示第一个多边形内部的空洞：

   [
     [[lon,lat],[lon,lat], ... ],  # main polygon
     [[lon,lat],[lon,lat], ... ],  # hole in main polygon
     ...
   ]

参见 Geo-shape mapping documentation 了解更多支持的形状。

public class GeoLocationShopSearchApp {

    @SuppressWarnings({ "resource", "unchecked" })
    public static void main(String[] args) throws Exception {
        Settings settings = Settings.builder()
                .put("cluster.name", "elasticsearch")
                .build();

        TransportClient client = new PreBuiltTransportClient(settings)
                .addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("localhost"), 9300));
        ;
        Coordinate coordinate = new Coordinate(100.3, 0.3);
        GeoShapeQueryBuilder qb = null;
        try {
            qb = geoShapeQuery(
                    "0",
                    ShapeBuilders.newPoint(coordinate));
        } catch (IOException e) {
            e.printStackTrace();
        }
        qb.relation(ShapeRelation.INTERSECTS);
        SearchResponse response = client.prepareSearch("example")
                .setTypes("doc")
                .setSearchType(SearchType.DFS_QUERY_THEN_FETCH)
                .setQuery(qb)
                .setSize(200)
                .setFrom(0)
                .execute()
                .actionGet();
        if (response != null && response.getHits() != null && response.getHits().getHits()!=null) {

            final ArrayList<SearchHit> searchHits = Lists.newArrayList(response.getHits().getHits());
            searchHits.stream().forEach(searchHit -> printHitsSource(searchHit));
        }
        client.close();
    }

    public static void printHitsSource(SearchHit searchHitFields){
        Map<String, Object> source = searchHitFields.getSource();
        System.out.println(new Gson().toJson(source));
    }
}

{"location":{"coordinates":[[[100.0,0.0],[101.0,0.0],[101.0,1.0],[100.0,1.0],[100.0,0.0]]],"type":"polygon"}}