elasticsearch简单JavaAPI总结
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基于员工信息的CRUD操作
/**
* 员工增删改查的应用程序
*
* @author Administrator
*
*/
public class EmployeeCRUDApp {
@SuppressWarnings({ "unchecked", "resource" })
public static void main(String[] args) throws Exception {
// 先构建client
Settings settings = Settings.builder().put("cluster.name", "elasticsearch").build();
TransportClient client = new PreBuiltTransportClient(settings)
.addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("localhost"), 9300));
// createEmployee(client);
// getEmployee(client);
// updateEmployee(client);
// deleteEmployee(client);
client.close();
}
/**
* 创建员工信息（创建一个document）
*
* @param client
*/
private static void createEmployee(TransportClient client) throws Exception {
IndexResponse response = client.prepareIndex("company", "employee", "1")
.setSource(XContentFactory.jsonBuilder().startObject().field("name", "jack").field("age", 27)
.field("position", "technique").field("country", "china").field("join_date", "2017-01-01")
.field("salary", 10000).endObject())
.get();
System.out.println(response.getResult());
}
/**
* 获取员工信息
*
* @param client
* @throws Exception
*/
private static void getEmployee(TransportClient client) throws Exception {
GetResponse response = client.prepareGet("company", "employee", "1").get();
System.out.println(response.getSourceAsString());
}
/**
* 修改员工信息
*
* @param client
* @throws Exception
*/
private static void updateEmployee(TransportClient client) throws Exception {
UpdateResponse response = client.prepareUpdate("company", "employee", "1")
.setDoc(XContentFactory.jsonBuilder().startObject().field("position", "technique manager").endObject())
.get();
System.out.println(response.getResult());
}
/**
* 删除 员工信息
*
* @param client
* @throws Exception
*/
private static void deleteEmployee(TransportClient client) throws Exception {
DeleteResponse response = client.prepareDelete("company", "employee", "1").get();
System.out.println(response.getResult());
}
}基于员工信息的查询操作
/**
* 员工搜索应用程序
*
* @author Administrator
*
*/
public class EmployeeSearchApp {
@SuppressWarnings({ "unchecked", "resource" })
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));
prepareData(client);
// executeSearch(client);
client.close();
}
/**
* 执行搜索操作
*
* @param client
*/
private static void executeSearch(TransportClient client) {
SearchResponse response = client.prepareSearch("company").setTypes("employee")
.setQuery(QueryBuilders.matchQuery("position", "technique"))
.setPostFilter(QueryBuilders.rangeQuery("age").from(30).to(40)).setFrom(0).setSize(1).get();
SearchHit[] searchHits = response.getHits().getHits();
for (int i = 0; i < searchHits.length; i++) {
System.out.println(searchHits[i].getSourceAsString());
}
}
/**
* 准备数据
*
* @param client
*/
private static void prepareData(TransportClient client) throws Exception {
client.prepareIndex("company", "employee", "1")
.setSource(XContentFactory.jsonBuilder().startObject().field("name", "jack").field("age", 27)
.field("position", "technique software").field("country", "china")
.field("join_date", "2017-01-01").field("salary", 10000).endObject())
.get();
client.prepareIndex("company", "employee", "2")
.setSource(XContentFactory.jsonBuilder().startObject().field("name", "marry").field("age", 35)
.field("position", "technique manager").field("country", "china")
.field("join_date", "2017-01-01").field("salary", 12000).endObject())
.get();
client.prepareIndex("company", "employee", "3")
.setSource(XContentFactory.jsonBuilder().startObject().field("name", "tom").field("age", 32)
.field("position", "senior technique software").field("country", "china")
.field("join_date", "2016-01-01").field("salary", 11000).endObject())
.get();
client.prepareIndex("company", "employee", "4")
.setSource(XContentFactory.jsonBuilder().startObject().field("name", "jen").field("age", 25)
.field("position", "junior finance").field("country", "usa").field("join_date", "2016-01-01")
.field("salary", 7000).endObject())
.get();
client.prepareIndex("company", "employee", "5")
.setSource(XContentFactory.jsonBuilder().startObject().field("name", "mike").field("age", 37)
.field("position", "finance manager").field("country", "usa").field("join_date", "2015-01-01")
.field("salary", 15000).endObject())
.get();
}
}基于员工新的聚合查询操作
/**
* 员工聚合分析应用程序
*
* @author Administrator
*
*/
public class EmployeeAggrApp {
@SuppressWarnings({ "unchecked", "resource" })
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));
SearchResponse searchResponse = client.prepareSearch("company")
.addAggregation(AggregationBuilders.terms("group_by_country").field("country")
.subAggregation(AggregationBuilders.dateHistogram("group_by_join_date").field("join_date")
.dateHistogramInterval(DateHistogramInterval.YEAR)
.subAggregation(AggregationBuilders.avg("avg_salary").field("salary"))))
.execute().actionGet();
Map<String, Aggregation> aggrMap = searchResponse.getAggregations().asMap();
StringTerms groupByCountry = (StringTerms) aggrMap.get("group_by_country");
Iterator<Bucket> groupByCountryBucketIterator = groupByCountry.getBuckets().iterator();
while (groupByCountryBucketIterator.hasNext()) {
Bucket groupByCountryBucket = groupByCountryBucketIterator.next();
System.out.println(groupByCountryBucket.getKey() + ":" + groupByCountryBucket.getDocCount());
Histogram groupByJoinDate = (Histogram) groupByCountryBucket.getAggregations().asMap()
.get("group_by_join_date");
Iterator<org.elasticsearch.search.aggregations.bucket.histogram.Histogram.Bucket> groupByJoinDateBucketIterator = groupByJoinDate
.getBuckets().iterator();
while (groupByJoinDateBucketIterator.hasNext()) {
org.elasticsearch.search.aggregations.bucket.histogram.Histogram.Bucket groupByJoinDateBucket = groupByJoinDateBucketIterator
.next();
System.out.println(groupByJoinDateBucket.getKey() + ":" + groupByJoinDateBucket.getDocCount());
Avg avg = (Avg) groupByJoinDateBucket.getAggregations().asMap().get("avg_salary");
System.out.println(avg.getValue());
}
}
client.close();
}
}注：聚合查询的时候可能出现问题：fielddata需要变为true，这个时候需要手动添加mapping
GET /company/_mapping/employee
{
"company": {
"mappings": {
"employee": {
"properties": {
"age": {
"type": "long"
},
"country": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore_above": 256
}
}
},
"join_date": {
"type": "date"
},
"name": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore_above": 256
}
}
},
"position": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore_above": 256
}
}
},
"salary": {
"type": "long"
}
}
}
}
}
}
Delete /company
上面查出来以后进行截取，修改"fielddata": true
PUT /company
{
"mappings": {
"employee": {
"properties": {
"age": {
"type": "long"
},
"country": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore_above": 256
}
},
"fielddata": true
},
"join_date": {
"type": "date"
},
"name": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore_above": 256
}
}
},
"position": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore_above": 256
}
}
},
"salary": {
"type": "long"
}
}
}
}
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