前言
前面记录了 Elasticsearch 全文检索的入门篇和进阶检索。这次我们来讲下 Spring Boot 中如何整合 ES，以及如何在 Spring Cloud 微服务项目中使用 ES 来实现全文检索，来达到商品检索的功能。
一、整合检索服务
检索服务单独作为一个服务，就称作 gulimall-search 模块。
1.1 创建 gulimall-search 模块
点击 Next 勾选 Spring Web 依赖，点击 finish 即可
1.2 配置 Maven 依赖
1.添加 es 高阶客户端
<dependency>
<groupId>org.elasticsearch.client</groupId>
<artifactId>elasticsearch-rest-high-level-client</artifactId>
<version>7.4.2</version>
</dependency>
2.选择 java 和 elasticsearch 版本
<properties>
<java.version>1.8</java.version>
<elasticsearch.version>7.4.2</elasticsearch.version>
</properties>
3.将之前的 common 包导入
<dependency>
<groupId>com.atguigu.gulimall</groupId>
<artifactId>gulimall-common</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
添加完依赖后，我们就可以将搜索服务注册到 nacos 注册中心了。 nacos 注册中心的用法在前面几篇文章中也详细讲解过，这里需要注意的是要先启动 nacos 注册中心，才能正常注册 gulimall-search 服务。
1.3 搜索服务注册到注册中心
spring.application.name=gulimall-search
spring.cloud.nacos.discovery.server-addr=127.0.0.1:8848
给启动类添加服务发现注解：@EnableDiscoveryClient，这样 gulimall-search 服务就可以被注册中心发现了。
因 common 模块依赖数据源，但 search 模块不依赖数据源，所以该模块需要移除数据源依赖，检索服务启动类如下
@EnableDiscoveryClient
@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)
public class GulimallSearchApplication {
public static void main(String[] args) {
SpringApplication.run(GulimallSearchApplication.class, args);
}
}
1.4 新增 es 配置类
@Configuration
public class ElasticsearchConfig {
@Bean
// 给容器注册一个 RestHighLevelClient，用来操作 ES
// 参考官方文档：https://www.elastic.co/guide/en/elasticsearch/client/java-rest/7.9/java-rest-high-getting-started-initialization.html
public RestHighLevelClient restHighLevelClient() {
return new RestHighLevelClient(
RestClient.builder(
new HttpHost("192.168.57.129", 9200, "http")));
}
}
1.5 测试 RestHighLevelClient 组件
@RunWith(SpringRunner.class)
@SpringBootTest
public class GulimallSearchApplicationTests {
@Resource
private RestHighLevelClient restHighLevelClient;
@Test
public void contextLoads() {
System.out.println(restHighLevelClient);
}
}
运行结果如下所示，打印出了 RestHighLevelClient。说明自定义的 ES Client 自动装载成功。
二、存储数据到 ES
2.1 测试 ES 简单插入数据
ElasticsearchConfig 安全配置
public static final RequestOptions COMMON_OPTIONS;
static {
RequestOptions.Builder builder = RequestOptions.DEFAULT.toBuilder();
// builder.addHeader("Authorization", "Bearer " + TOKEN);
// builder.setHttpAsyncResponseConsumerFactory(
// new HttpAsyncResponseConsumerFactory
// .HeapBufferedResponseConsumerFactory(30 * 1024 * 1024 * 1024));
COMMON_OPTIONS = builder.build();
}
测试类
/**
* 测试存储数据到es
* 更新也可以
* @throws IOException
*/
@Test
public void indexData() throws IOException {
IndexRequest index = new IndexRequest("users");
index.id("1");
//第一种：index.source("userName","zhangsan","age","18","gender","男");
//第二种：
User user = new User();
user.setUserName("zhangsan");
user.setAge(18);
user.setGender("男");
String jsonString = JSON.toJSONString(user);
//要保存的数据
index.source(jsonString, XContentType.JSON);
//执行操作
IndexResponse response = restHighLevelClient.index(index, ElasticsearchConfig.COMMON_OPTIONS);
//提取有用的响应数据
System.out.println(response);
}
@Data
class User{
private String userName;
private String gender;
private Integer age;
}
控制台打印数据
测试数据存储到 es 成功
2.2 测试 ES 查询复杂语句
1.查看检索条件
@Test
public void searchData() throws IOException {
// 1.创建检索请求
SearchRequest request = new SearchRequest();
// 指定索引
request.indices("bank");
// 指定DSL,检索条件
// SearchSourceBuilder sourceBuilder 封装的条件
SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
// 1.1构造检索条件
// sourceBuilder.query();
// sourceBuilder.from();
// sourceBuilder.size();
// sourceBuilder.aggregations();
sourceBuilder.query(QueryBuilders.matchQuery("address", "mill"));
System.out.println(sourceBuilder.toString());
request.source(sourceBuilder);
// 2.执行检索
SearchResponse response = restHighLevelClient.search(request, ElasticsearchConfig.COMMON_OPTIONS);
// 3.分析结果 response
System.out.println(response.toString());
}
查看检索结果
2.按照年龄值的分布和平均薪资进行聚合
@Test
public void searchData() throws IOException {
// 1.创建检索请求
SearchRequest request = new SearchRequest();
// 指定索引
request.indices("bank");
// 指定DSL,检索条件
// SearchSourceBuilder sourceBuilder 封装的条件
SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
// 1.1构造检索条件
// sourceBuilder.query();
// sourceBuilder.from();
// sourceBuilder.size();
// sourceBuilder.aggregations();
sourceBuilder.query(QueryBuilders.matchQuery("address","mill"));
// 1.2按照年龄值的分布进行聚合
TermsAggregationBuilder ageAgg = AggregationBuilders.terms("ageAgg").field("age").size(10);
sourceBuilder.aggregation(ageAgg);
// 1.3计算平均薪资
AvgAggregationBuilder balance = AggregationBuilders.avg("balanceAvg").field("balance");
sourceBuilder.aggregation(balance);
System.out.println("检索条件：" + sourceBuilder.toString());
request.source(sourceBuilder);
// 2.执行检索
SearchResponse response = restHighLevelClient.search(request, ElasticsearchConfig.COMMON_OPTIONS);
// 3.分析结果 response
System.out.println(response.toString());
}
删除默认信息后，检索条件如下
{
"query": {
"match": {
"address": {
"query": "mill"
}
}
},
"aggregations": {
"ageAgg": {
"terms": {
"field": "age",
"size": 10
}
},
"balanceAvg": {
"avg": {
"field": "balance"
}
}
}
}
复制检索条件到 Kibana 进行检索
整体测试文章来源：https://www.toymoban.com/news/detail-473897.html
@RunWith(SpringRunner.class)
@SpringBootTest
public class GulimallSearchApplicationTests {
@Resource
private RestHighLevelClient restHighLevelClient;
@Test
public void searchData() throws IOException {
// 1.创建检索请求
SearchRequest request = new SearchRequest();
// 指定索引
request.indices("bank");
// 指定DSL,检索条件
// SearchSourceBuilder sourceBuilder 封装的条件
SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
// 1.1构造检索条件
// sourceBuilder.query();
// sourceBuilder.from();
// sourceBuilder.size();
// sourceBuilder.aggregations();
sourceBuilder.query(QueryBuilders.matchQuery("address","mill"));
// 1.2按照年龄值的分布进行聚合
TermsAggregationBuilder ageAgg = AggregationBuilders.terms("ageAgg").field("age").size(10);
sourceBuilder.aggregation(ageAgg);
// 1.3计算平均薪资
AvgAggregationBuilder balance = AggregationBuilders.avg("balanceAvg").field("balance");
sourceBuilder.aggregation(balance);
System.out.println("检索条件：" + sourceBuilder.toString());
request.source(sourceBuilder);
// 2.执行检索
SearchResponse response = restHighLevelClient.search(request, ElasticsearchConfig.COMMON_OPTIONS);
// 3.分析结果 response
System.out.println(response.toString());
// Map map = JSON.parseObject(searchResponse.toString(), Map.class);
//3.1)、获取所有查到的数据
SearchHits hits = response.getHits();
SearchHit[] searchHits = hits.getHits();
for (SearchHit hit : searchHits) {
/**
* "_index" : "bank",
* "_type" : "account",
* "_id" : "970",
* "_score" : 5.4598455,
* "_source" : {
*/
// hit.getIndex();hit.getType();hit.getId();
String string = hit.getSourceAsString();
Account account = JSON.parseObject(string, Account.class);
System.out.println("account: " + account);
}
//3.2)、获取这次检索到的分析信息；
Aggregations aggregations = response.getAggregations();
// for (Aggregation aggregation : aggregations.asList()) {
// System.out.println("当前聚合："+aggregation.getName());
// aggregation.getName()
// }
Terms ageAgg1 = aggregations.get("ageAgg");
for (Terms.Bucket bucket : ageAgg1.getBuckets()) {
String keyAsString = bucket.getKeyAsString();
System.out.println("年龄："+keyAsString+"==>"+bucket.getDocCount());
}
Avg balanceAvg1 = aggregations.get("balanceAvg");
System.out.println("平均薪资："+balanceAvg1.getValue());
}
/**
* 测试存储数据到es
* 更新也可以
* @throws IOException
*/
@Test
public void indexData() throws IOException {
IndexRequest index = new IndexRequest("users");
index.id("1");
//第一种：index.source("userName","zhangsan","age","18","gender","男");
//第二种：
User user = new User();
user.setUserName("zhangsan");
user.setAge(18);
user.setGender("男");
String jsonString = JSON.toJSONString(user);
//要保存的数据
index.source(jsonString, XContentType.JSON);
//执行操作
IndexResponse response = restHighLevelClient.index(index, ElasticsearchConfig.COMMON_OPTIONS);
//提取有用的响应数据
System.out.println(response);
}
@Test
public void contextLoads() {
System.out.println(restHighLevelClient);
}
@Data
class User{
private String userName;
private String gender;
private Integer age;
}
@Data
@ToString
static class Account {
private int account_number;
private int balance;
private String firstname;
private String lastname;
private int age;
private String gender;
private String address;
private String employer;
private String email;
private String city;
private String state;
}
}
控制台输出文章来源地址https://www.toymoban.com/news/detail-473897.html
检索条件：{"query":{"match":{"address":{"query":"mill","operator":"OR","prefix_length":0,"max_expansions":50,"fuzzy_transpositions":true,"lenient":false,"zero_terms_query":"NONE","auto_generate_synonyms_phrase_query":true,"boost":1.0}}},"aggregations":{"ageAgg":{"terms":{"field":"age","size":10,"min_doc_count":1,"shard_min_doc_count":0,"show_term_doc_count_error":false,"order":[{"_count":"desc"},{"_key":"asc"}]}},"balanceAvg":{"avg":{"field":"balance"}}}}
{"took":1,"timed_out":false,"_shards":{"total":1,"successful":1,"skipped":0,"failed":0},"hits":{"total":{"value":4,"relation":"eq"},"max_score":5.4598455,"hits":[{"_index":"bank","_type":"account","_id":"970","_score":5.4598455,"_source":{"account_number":970,"balance":19648,"firstname":"Forbes","lastname":"Wallace","age":28,"gender":"M","address":"990 Mill Road","employer":"Pheast","email":"forbeswallace@pheast.com","city":"Lopezo","state":"AK"}},{"_index":"bank","_type":"account","_id":"136","_score":5.4598455,"_source":{"account_number":136,"balance":45801,"firstname":"Winnie","lastname":"Holland","age":38,"gender":"M","address":"198 Mill Lane","employer":"Neteria","email":"winnieholland@neteria.com","city":"Urie","state":"IL"}},{"_index":"bank","_type":"account","_id":"345","_score":5.4598455,"_source":{"account_number":345,"balance":9812,"firstname":"Parker","lastname":"Hines","age":38,"gender":"M","address":"715 Mill Avenue","employer":"Baluba","email":"parkerhines@baluba.com","city":"Blackgum","state":"KY"}},{"_index":"bank","_type":"account","_id":"472","_score":5.4598455,"_source":{"account_number":472,"balance":25571,"firstname":"Lee","lastname":"Long","age":32,"gender":"F","address":"288 Mill Street","employer":"Comverges","email":"leelong@comverges.com","city":"Movico","state":"MT"}}]},"aggregations":{"lterms#ageAgg":{"doc_count_error_upper_bound":0,"sum_other_doc_count":0,"buckets":[{"key":38,"doc_count":2},{"key":28,"doc_count":1},{"key":32,"doc_count":1}]},"avg#balanceAvg":{"value":25208.0}}}
account: GulimallSearchApplicationTests.Account(account_number=970, balance=19648, firstname=Forbes, lastname=Wallace, age=28, gender=M, address=990 Mill Road, employer=Pheast, email=forbeswallace@pheast.com, city=Lopezo, state=AK)
account: GulimallSearchApplicationTests.Account(account_number=136, balance=45801, firstname=Winnie, lastname=Holland, age=38, gender=M, address=198 Mill Lane, employer=Neteria, email=winnieholland@neteria.com, city=Urie, state=IL)
account: GulimallSearchApplicationTests.Account(account_number=345, balance=9812, firstname=Parker, lastname=Hines, age=38, gender=M, address=715 Mill Avenue, employer=Baluba, email=parkerhines@baluba.com, city=Blackgum, state=KY)
account: GulimallSearchApplicationTests.Account(account_number=472, balance=25571, firstname=Lee, lastname=Long, age=32, gender=F, address=288 Mill Street, employer=Comverges, email=leelong@comverges.com, city=Movico, state=MT)
年龄：38==>2
年龄：28==>1
年龄：32==>1
平均薪资：25208.0
2023-05-12 22:43:00.325 INFO 17832 --- [ Thread-9] o.s.s.concurrent.ThreadPoolTaskExecutor : Shutting down ExecutorService 'applicationTaskExecutor'
Process finished with exit code 0
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