ElasticSearch API记录
ElasticSearch API依赖管理<properties><java.version>1.8</java.version><!-- 统一版本 --><elasticsearch.version>7.6.1</elasticsearch.version></properties><dependency&
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ElasticSearch API
依赖管理
<properties>
<java.version>1.8</java.version>
<!-- 统一版本 -->
<elasticsearch.version>7.6.1</elasticsearch.version>
</properties>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-elasticsearch</artifactId>
</dependency>
定义配置类
@Configuration
public class ElasticSearchConfig {
// 注册 rest高级客户端
@Bean
public RestHighLevelClient restHighLevelClient(){
RestHighLevelClient client = new RestHighLevelClient(
RestClient.builder(
new HttpHost("127.0.0.1",9200,"http")
)
);
return client;
}
}
APIS
索引操作
// 测试索引的创建, Request PUT demo_index
@Test
public void testCreateIndex() throws IOException {
CreateIndexRequest request = new CreateIndexRequest("demo_index");
CreateIndexResponse response = restHighLevelClient.indices().create(request, RequestOptions.DEFAULT);
// 查看是否创建成功
System.out.println(response.isAcknowledged());
// 查看返回对象
System.out.println(response);
restHighLevelClient.close();
}
// 测试获取索引,并判断其是否存在
@Test
public void testIndexIsExists() throws IOException {
GetIndexRequest request = new GetIndexRequest("index");
boolean exists = restHighLevelClient.indices().exists(request, RequestOptions.DEFAULT);
// 索引是否存在
System.out.println(exists);
restHighLevelClient.close();
}
// 测试索引删除
@Test
public void testDeleteIndex() throws IOException {
DeleteIndexRequest request = new DeleteIndexRequest("demo_index");
AcknowledgedResponse response = restHighLevelClient.indices().delete(request, RequestOptions.DEFAULT);
// 是否删除成功
System.out.println(response.isAcknowledged());
restHighLevelClient.close();
}
文档操作
// 文档添加
@Test
public void testAddDocument() throws IOException {
User demo = new User("demo", 18);
// 创建请求
IndexRequest request = new IndexRequest("demo_index");
// 制定规则 PUT /demo_index/_doc/1
request.id("1");// 设置文档ID
request.timeout(TimeValue.timeValueMillis(1000));// request.timeout("1s")
// 将我们的数据放入请求中
request.source(JSON.toJSONString(demo), XContentType.JSON);
// 客户端发送请求,获取响应的结果
IndexResponse response = restHighLevelClient.index(request, RequestOptions.DEFAULT);
System.out.println(response.status());// 获取建立索引的状态信息 CREATED
System.out.println(response);// 查看返回内容 IndexResponse[index=demo_index,type=_doc,id=1,version=1,result=created,seqNo=0,primaryTerm=1,shards={"total":2,"successful":1,"failed":0}]
}
// 测试获得文档信息
@Test
public void testGetDocument() throws IOException {
GetRequest request = new GetRequest("demo_index","1");
GetResponse response = restHighLevelClient.get(request, RequestOptions.DEFAULT);
// 打印文档内容
System.out.println(response.getSourceAsString());
// 返回的全部内容和命令是一样的
System.out.println(request);
restHighLevelClient.close();
}
// 获取文档,判断是否存在 get /demo_index/_doc/1
@Test
public void testDocumentIsExists() throws IOException {
GetRequest request = new GetRequest("demo_index", "1");
// 不获取返回的 _source的上下文了
request.fetchSourceContext(new FetchSourceContext(false));
request.storedFields("_none_");
boolean exists = restHighLevelClient.exists(request, RequestOptions.DEFAULT);
System.out.println(exists);
}
// 测试更新文档内容
@Test
public void testUpdateDocument() throws IOException {
UpdateRequest request = new UpdateRequest("demo_index", "1");
User user = new User("lmk",11);
request.doc(JSON.toJSONString(user),XContentType.JSON);
UpdateResponse response = restHighLevelClient.update(request, RequestOptions.DEFAULT);
// OK
System.out.println(response.status());
restHighLevelClient.close();
}
// 测试删除文档
@Test
public void testDeleteDocument() throws IOException {
DeleteRequest request = new DeleteRequest("demo_index", "1");
request.timeout("1s");
DeleteResponse response = restHighLevelClient.delete(request, RequestOptions.DEFAULT);
// OK
System.out.println(response.status());
}
// 查询
// SearchRequest 搜索请求
// SearchSourceBuilder 条件构造
// HighlightBuilder 高亮
// TermQueryBuilder 精确查询
// MatchAllQueryBuilder
// xxxQueryBuilder ...
@Test
public void testSearch() throws IOException {
// 1.创建查询请求对象
SearchRequest searchRequest = new SearchRequest();
// 2.构建搜索条件
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
// (1)查询条件 使用QueryBuilders工具类创建
// 精确查询
TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("name", "demo");
// // 匹配查询
// MatchAllQueryBuilder matchAllQueryBuilder = QueryBuilders.matchAllQuery();
// (2)其他<可有可无>:(可以参考 SearchSourceBuilder 的字段部分)
// 设置高亮
searchSourceBuilder.highlighter(new HighlightBuilder());
// // 分页
// searchSourceBuilder.from();
// searchSourceBuilder.size();
searchSourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS));
// (3)条件投入
searchSourceBuilder.query(termQueryBuilder);
// 3.添加条件到请求
searchRequest.source(searchSourceBuilder);
// 4.客户端查询请求
SearchResponse search = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
// 5.查看返回结果
SearchHits hits = search.getHits();
System.out.println(JSON.toJSONString(hits));
System.out.println("=======================");
for (SearchHit documentFields : hits.getHits()) {
System.out.println(documentFields.getSourceAsMap());
}
}
// 上面的这些api无法批量增加数据(只会保留最后一个source)
@Test
public void test() throws IOException {
IndexRequest request = new IndexRequest("bulk");// 没有id会自动生成一个随机ID
request.source(JSON.toJSONString(new User("liu",1)),XContentType.JSON);
request.source(JSON.toJSONString(new User("min",2)),XContentType.JSON);
request.source(JSON.toJSONString(new User("kai",3)),XContentType.JSON);
IndexResponse index = restHighLevelClient.index(request, RequestOptions.DEFAULT);
// created
System.out.println(index.status());
}
// 特殊的,真的项目一般会 批量插入数据
@Test
public void testBulk() throws IOException {
BulkRequest bulkRequest = new BulkRequest();
bulkRequest.timeout("10s");
ArrayList<User> users = new ArrayList<>();
users.add(new User("demo-1",1));
users.add(new User("demo-2",2));
users.add(new User("demo-3",3));
users.add(new User("demo-4",4));
users.add(new User("demo-5",5));
users.add(new User("demo-6",6));
// 批量请求处理
for (int i = 0; i < users.size(); i++) {
bulkRequest.add(
// 这里是数据信息
new IndexRequest("bulk")
.id(""+(i + 1)) // 没有设置id 会自定生成一个随机id
.source(JSON.toJSONString(users.get(i)),XContentType.JSON)
);
}
BulkResponse bulk = restHighLevelClient.bulk(bulkRequest, RequestOptions.DEFAULT);
System.out.println(bulk.status());// ok
}
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