# 基于地理位置对周围汽车 4S 店进行搜索
要进行地理位置的搜索需要添加两个依赖
<dependency>
<groupId>org.locationtech.spatial4j</groupId>
<artifactId>spatial4j</artifactId>
<version>0.6</version>
</dependency>
<dependency>
<groupId>com.vividsolutions</groupId>
<artifactId>jts</artifactId>
<version>1.13</version>
<exclusions>
<exclusion>
<groupId>xerces</groupId>
<artifactId>xercesImpl</artifactId>
</exclusion>
</exclusions>
</dependency>
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or
compile 'org.locationtech.spatial4j:spatial4j:0.6'
compile 'com.vividsolutions:jts:1.13'
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比如我们有很多的 4s 店，给了用户一个 app，在某个地方的时候，可以根据当前的地理位置搜索一下，自己附近的 4s 店
新增一个 mapping
POST /car_shop/_mapping/shops
{
"properties": {
"pin": {
"properties": {
"location": {
"type": "geo_point"
}
}
}
}
}
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插入数据
PUT /car_shop/shops/1
{
"name": "上海至全宝马4S店",
"pin" : {
"location" : {
"lat" : 40.12,
"lon" : -71.34
}
}
}
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需求：搜索两个坐标点组成的一个区域
来回顾下 restfull 语法
GET /car_shop/shops/_search
{
"query": {
"geo_bounding_box": {
"pin.location": {
"top_left": {
"lat": 42,
"lon": -72
},
"bottom_right": {
"lat": 40,
"lon": -74
}
}
}
}
}
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再对比下 java 语法
@Test
public void geoBoundingBoxQuery() {
GeoBoundingBoxQueryBuilder geoBoundingBoxQueryBuilder = QueryBuilders.geoBoundingBoxQuery("pin.location")
.setCorners(40.73, -74.1, 40.01, -71.12);
SearchResponse searchResponse = client.prepareSearch("car_shop")
.setTypes("shops")
.setQuery(geoBoundingBoxQueryBuilder)
.get();
System.out.println(searchResponse);
}
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响应数据
{"took":1,"timed_out":false,"_shards":{"total":5,"successful":5,"failed":0},"hits":{"total":1,"max_score":1.0,"hits":[{"_index":"car_shop","_type":"shops","_id":"1","_score":1.0,"_source":{
"name": "上海至全宝马4S店",
"pin" : {
"location" : {
"lat" : 40.12,
"lon" : -71.34
}
}
}
}]}}
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需求：指定一个区域，由三个坐标点，组成，比如上海大厦，东方明珠塔，上海火车站
@Test
public void geoPolygonQuery() {
ArrayList<GeoPoint> geoPoints = new ArrayList<>();
geoPoints.add(new GeoPoint(40.73, -74.1));
geoPoints.add(new GeoPoint(40.01, -71.12));
geoPoints.add(new GeoPoint(50.56, -90.58));
GeoPolygonQueryBuilder query = QueryBuilders.geoPolygonQuery("pin.location", geoPoints);
SearchResponse searchResponse = client.prepareSearch("car_shop")
.setTypes("shops")
.setQuery(query)
.get();
System.out.println(searchResponse);
}
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需求：搜索距离当前位置在 200 公里内的 4s 店
@Test
public void geoDistanceQuery() {
GeoDistanceQueryBuilder query = QueryBuilders.geoDistanceQuery("pin.location")
.point(40, -70)
.distance(200, DistanceUnit.KILOMETERS);
SearchResponse searchResponse = client.prepareSearch("car_shop")
.setTypes("shops")
.setQuery(query)
.get();
System.out.println(searchResponse);
}
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