Spring Boot 集成 ElasticSearch
1. pom.xml 中添加依賴
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-elasticsearch</artifactId>
</dependency>
2. application.properties中添加 配置信息
# 集羣名(默認值: elasticsearch,在elasticsearch.yml配置文件中修改
# `cluster.name`: es-application)
spring.data.elasticsearch.cluster-name=es-application
# 集羣節點地址列表,用逗號分隔
spring.data.elasticsearch.cluster-nodes=127.0.0.1:9300
3. 在查詢實體上添加ES註解 例如:
@Document(indexName = "customer", type = "customer", shards = 1, replicas = 0, refreshInterval = "-1")
public class Customer {
//Id註解加上後,在Elasticsearch裏相應於該列就是主鍵了,在查詢時就可以直接用主鍵查詢
@Id
private String id;
private String userName;
private String address;
private int age;
public Customer() {
}
public Customer(String userName, String address, int age) {
this.userName = userName;
this.address = address;
this.age = age;
}
public String getId() {
return this.id;
}
public void setId(String id) {
this.id = id;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getAddress() {
return address;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public void setAddress(String address) {
this.address = address;
}
@Override
public String toString() {
return "Customer{" +
"id='" + id + '\'' +
", userName='" + userName + '\'' +
", address='" + address + '\'' +
", age=" + age +
'}';
}
}
4. 編寫操作的 repository (類似JPA)
public interface CustomerRepository extends ElasticsearchRepository<Customer, String> {
public List<Customer> findByAddress(String address);
public Customer findByUserName(String userName);
public int deleteByUserName(String userName);
public Page<Customer> findByAddress(String address, Pageable pageable);
}
5. 簡單配置完成之後我們在業務中就可以使用 ElasticSearch 了。
我們來測試一下:repository
裏面除了增刪改查、排序、分頁、多條件查詢、範圍查詢、模糊查詢、聚合運算等,具體參考ES官方API
https://www.elastic.co/guide/en/elasticsearch/reference/current/getting-started.html
package com.duk.repository;
import com.duk.model.Customer;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.common.unit.Fuzziness;
import org.elasticsearch.index.query.QueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.aggregations.Aggregation;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.Aggregations;
import org.elasticsearch.search.aggregations.metrics.sum.InternalSum;
import org.elasticsearch.search.aggregations.metrics.sum.SumAggregationBuilder;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import org.springframework.data.domain.Sort;
import org.springframework.data.elasticsearch.core.ElasticsearchTemplate;
import org.springframework.data.elasticsearch.core.ResultsExtractor;
import org.springframework.data.elasticsearch.core.query.NativeSearchQueryBuilder;
import org.springframework.data.elasticsearch.core.query.SearchQuery;
import org.springframework.test.context.junit4.SpringRunner;
import java.util.Map;
@RunWith(SpringRunner.class)
@SpringBootTest
public class CustomerRepositoryTest {
@Autowired
private CustomerRepository repository;
@Autowired
private ElasticsearchTemplate elasticsearchTemplate;
@Test
public void saveCustomers() {
repository.save(new Customer("Alice", "北京",13));
repository.save(new Customer("Bob", "北京",23));
repository.save(new Customer("neo", "西安",30));
repository.save(new Customer("summer", "煙臺",22));
}
@Test
public void fetchAllCustomers() {
System.out.println("Customers found with findAll():");
System.out.println("-------------------------------");
Iterable<Customer> iterable=repository.findAll();
for (Customer customer :iterable) {
System.out.println(customer);
}
}
@Test
public void deleteCustomers() {
repository.deleteAll();
// repository.deleteByUserName("neo");
}
@Test
public void updateCustomers() {
Customer customer= repository.findByUserName("summer");
System.out.println(customer);
customer.setAddress("北京市海淀區西直門");
repository.save(customer);
Customer xcustomer=repository.findByUserName("summer");
System.out.println(xcustomer);
}
@Test
public void fetchIndividualCustomers() {
System.out.println("Customer found with findByUserName('summer'):");
System.out.println("--------------------------------");
System.out.println(repository.findByUserName("summer"));
System.out.println("--------------------------------");
System.out.println("Customers found with findByAddress(\"北京\"):");
String q="北京";
for (Customer customer : repository.findByAddress(q)) {
System.out.println(customer);
}
}
@Test
public void fetchPageCustomers() {
System.out.println("Customers found with fetchPageCustomers:");
System.out.println("-------------------------------");
Sort sort = new Sort(Sort.Direction.DESC, "address.keyword");
Pageable pageable = PageRequest.of(0, 10, sort);
Page<Customer> customers=repository.findByAddress("北京", pageable);
System.out.println("Page customers "+customers.getContent().toString());
}
@Test
public void fetchPage2Customers() {
// 精確查詢
QueryBuilders.termQuery("address","北京");
QueryBuilders.matchQuery("address","北京");
//
QueryBuilders.termsQuery("","");
QueryBuilders.multiMatchQuery("","");
QueryBuilders.matchAllQuery();
// 模糊查詢
//1.常用的字符串查詢
QueryBuilders.queryStringQuery("fieldValue").field("fieldName");//左右模糊
//2.常用的用於推薦相似內容的查詢
//如果不指定filedName,則默認全部,常用在相似內容的推薦上
// QueryBuilders.moreLikeThisQuery(new String[] {"fieldName"}).addLikeText("pipeidhua");
//3.前綴查詢,如果字段沒分詞,就匹配整個字段前綴
QueryBuilders.prefixQuery("fieldName","fieldValue");
//4.fuzzy query:分詞模糊查詢,通過增加 fuzziness 模糊屬性來查詢,如能夠匹配 hotelName 爲 tel 前或後加一個字母的文檔,
// fuzziness 的含義是檢索的 term 前後增加或減少 n 個單詞的匹配查詢
QueryBuilders.fuzzyQuery("hotelName", "tel").fuzziness(Fuzziness.ONE);
//5.wildcard query:通配符查詢,支持* 任意字符串;?任意一個字符
QueryBuilders.wildcardQuery("fieldName","ctr*");//前面是fieldname,後面是帶匹配字符的字符串
QueryBuilders.wildcardQuery("fieldName","c?r?");
// 範圍查詢
//閉區間查詢
QueryBuilder queryBuilder0 = QueryBuilders.rangeQuery("fieldName").from("fieldValue1").to("fieldValue2");
//開區間查詢
//默認是 true,也就是包含
QueryBuilder queryBuilder1 = QueryBuilders.rangeQuery("fieldName").from("fieldValue1").to("fieldValue2").includeUpper(false).includeLower(false);
//大於
QueryBuilder queryBuilder2 = QueryBuilders.rangeQuery("fieldName").gt("fieldValue");
//大於等於
QueryBuilder queryBuilder3 = QueryBuilders.rangeQuery("fieldName").gte("fieldValue");
//小於
QueryBuilder queryBuilder4 = QueryBuilders.rangeQuery("fieldName").lt("fieldValue");
//小於等於
QueryBuilder queryBuilder5 = QueryBuilders.rangeQuery("fieldName").lte("fieldValue");
// 多條件查詢
QueryBuilders.boolQuery().should();// or
QueryBuilders.boolQuery().must();//文檔必須完全匹配條件,相當於 and
QueryBuilders.boolQuery().mustNot();//文檔必須不匹配條件,相當於 not
System.out.println("Customers found with fetchPageCustomers:");
System.out.println("-------------------------------");
QueryBuilder customerQuery = QueryBuilders.boolQuery()
.must(QueryBuilders.matchQuery("address", "北京"));
Page<Customer> page = repository.search(customerQuery, PageRequest.of(0, 10));
System.out.println("Page customers "+page.getContent().toString());
page = repository.search(customerQuery, PageRequest.of(1, 10));
System.out.println("Page customers "+page.getContent().toString());
}
@Test
public void fetchAggregation() {
// 聚合查詢的使用方式。5步驟
System.out.println("Customers found with fetchAggregation:");
System.out.println("-------------------------------");
QueryBuilder customerQuery = QueryBuilders.boolQuery()
.must(QueryBuilders.matchQuery("address", "北京"));
SumAggregationBuilder sumBuilder = AggregationBuilders.sum("sumAge").field("age");
SearchQuery searchQuery = new NativeSearchQueryBuilder()
.withQuery(customerQuery)
.addAggregation(sumBuilder)
.build();
Aggregations aggregations = elasticsearchTemplate.query(searchQuery, new ResultsExtractor<Aggregations>() {
@Override
public Aggregations extract(SearchResponse response) {
return response.getAggregations();
}
});
//轉換成map集合
Map<String, Aggregation> aggregationMap = aggregations.asMap();
//獲得對應的聚合函數的聚合子類,該聚合子類也是個map集合,裏面的value就是桶Bucket,我們要獲得Bucket
InternalSum sumAge = (InternalSum) aggregationMap.get("sumAge");
System.out.println("sum age is "+sumAge.getValue());
}
}