? ? ? ? ?ES為用戶提供了基于地理位置的搜索功能。它主要支持兩種類型的地理查詢：一種是地理點(diǎn)（geo_point）,即經(jīng)緯度查詢，另一種是地理形狀查詢（geo_shape）,即支持點(diǎn)，線，圓形和多邊形等查詢。

? ? ? ? 從實(shí)用性來說，地理點(diǎn)（即geo_point）數(shù)據(jù)類型的使用更多一些，對(duì)于geo_point字段類型的查詢方式有三種，分別為geo_distance查詢（圓形區(qū)域查詢），geo_bounding_box查詢（矩形區(qū)域查詢）和geo_polygon查詢（多邊形區(qū)域查詢）。

1.geo_distance圓形區(qū)域查詢

geo_distance需要指定一個(gè)坐標(biāo)點(diǎn)，在指定該點(diǎn)距離的范圍后，ES可查詢到以該點(diǎn)為中心，距離為半徑的圓形區(qū)域的數(shù)據(jù)。

1.1 查詢的DSL

GET index_school/_search
{
  "_source": [                        // 只返回部分字段
    "name",
    "latitude",
    "longitude",
    "devideNo",
    "time"
    ], 
  "query": {
    "geo_distance":{
      "distance": "5km",             // 距離范圍(半徑)為5km
      "location":{                   //中心點(diǎn)經(jīng)緯度
        "lat": "18.231472",
        "lon": "109.502083"
      }
    }
  }
}

1.2 java實(shí)現(xiàn)

SearchRequest request = new SearchRequest(tableName);
BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
boolQuery.filter(QueryBuilders.geoDistanceQuery("location")                //指定索引字段
.distance(inputDTO.getDistance())                                          //距離中心點(diǎn)范圍(半徑)
.point(18.231472,109.502083));                                             //中心點(diǎn)
request.source().query(boolQuery).size(10000).trackTotalHits(true);
SearchResponse response = restHighLevelClient.search(request, RequestOptions.DEFAULT);

2.geo_bounding_box矩形區(qū)域查詢

geo_bounding_box查詢提供的是矩形內(nèi)的搜索，需要提供左上角和右下角的頂點(diǎn)坐標(biāo)。

2.1 查詢的DSL

GET index_school/_search
{
  "_source": [                        
    "name",
    "latitude",
    "longitude",
    "devideNo",
    "time"
    ], 
  "query": {
    "geo_bounding_box":{
      "location":{   
        "top_left":{                          //設(shè)置左上角頂點(diǎn)坐標(biāo)
           "lat": "18.431472",
           "lon": "109.502083"
        },
        "bottom_right":{                      //設(shè)置右下角頂點(diǎn)坐標(biāo)
           "lat": "18.231472",
           "lon": "109.202083"
        }
      }
    }
  }
}

2.2 java實(shí)現(xiàn)

SearchRequest request = new SearchRequest(tableName);
BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
boolQuery.filter(QueryBuilders.geoBoundingBoxQuery("location")             //指定索引字段
.setCorners(inputDTO.getYMax(), inputDTO.getXMin(),                        //構(gòu)造矩形
                    inputDTO.getYMin(), inputDTO.getXMax()));
request.source().query(boolQuery).size(10000).trackTotalHits(true);
SearchResponse response = restHighLevelClient.search(request, RequestOptions.DEFAULT);

3.geo_polygon多邊形區(qū)域查詢

geo_polygon比geo_bounding_box提供的地理范圍功能更加靈活，它支持靈活多變的多邊形內(nèi)數(shù)據(jù)查詢，使用該查詢需要提供多邊形所有頂點(diǎn)的坐標(biāo)。文章來源地址http://www.zghlxwxcb.cn/news/detail-528685.html

3.1 查詢的DSL

GET index_school/_search
{
  "query": {
    "geo_polygon":{
      "location":{   
        "points":[
          {
           "lat": "20.219935",
           "lon":  "109.700590"
          },
          {
           "lat": "20.118963",
           "lon":  "109.865898"
          },
          {
           "lat": "20.148887",
           "lon":  "110.1842848"
          },
          {
           "lat": "20.355594",
           "lon":  "111.097193"
          },
          {
           "lat": "20.295775",
           "lon":  "111.791273"
          }
        ]
      }
    }
  }
}

3.2 java實(shí)現(xiàn)

String AREA_POINTS =
            "109.70059057645672,20.219935185668575," +
            "109.86589885747735,20.11896383759739," +
            "110.18428481460053,20.148887724639927," +
            "111.09719394252089,20.355594505110506," +
            "111.79127352756524,20.295775199436054," +
            "111.44955008175484,19.864326194135216," +
            "110.65937420024187,18.52295323361459," +
            "109.76478316052932,17.989118493905913," +
            "109.57997296428381,17.95228226006386";
SearchRequest request = new SearchRequest(tableName);
BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
List<GeoPoint> points = new ArrayList<>();
String[] strings = AREA_POINTS.split(",");
for (int i = 0; i < strings.length; i = i + 2) {
    points.add(new GeoPoint(Double.valueOf(strings[i + 1]), Double.valueOf(strings[i])));
}
boolQuery.filter(QueryBuilders.geoPolygonQuery("location",points));
request.source().query(boolQuery).size(10000).trackTotalHits(true);
SearchResponse response = restHighLevelClient.search(request, RequestOptions.DEFAULT);

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