ElasticSearch 7.6.x 版本 2020最新版 JavaRest api
前言
周末闲来无事，到官网学习（fanyi）了下最新版本的ESJavaRest API。
ES版本：7.6.2
Springboot版本：2.2.6
准备工作及注意事项
1. Maven导包
Springboot 2.2.6默认帮我们导入的是ES 6.8.7的包，所以我们需要更改下版本
<elasticsearch.version>7.6.1</elasticsearch.version>
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2. 初始化Client
@Configuration
public class ElasticSearchConfig {
@Bean
public RestHighLevelClient client(){
RestHighLevelClient client = new RestHighLevelClient(RestClient.builder(
new HttpHost("localhost",9200,"http")
));
return client;
}
}
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索引（index）
增加索引
//创建索引
@Test
void createIndex() throws IOException {
CreateIndexRequest request = new CreateIndexRequest("index1");
CreateIndexResponse createIndexResponse =
client.indices().create(request, RequestOptions.DEFAULT);
}
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删除索引
//删除索引
@Test
void deleteIndex() throws IOException {
DeleteIndexRequest request = new DeleteIndexRequest("index1");
AcknowledgedResponse delete = client.indices().delete(request, RequestOptions.DEFAULT);
boolean isSuccessful = delete.isAcknowledged();
System.out.println(isSuccessful);
}
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查询索引是否存在
//返回索引是否存在
@Test
void existIndex() throws IOException {
GetIndexRequest request = new GetIndexRequest("index1");
boolean exists = client.indices().exists(request, RequestOptions.DEFAULT);
System.out.println(exists);
}
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文档（document）
添加文档
//添加文档
@Test
void addDocument() throws IOException {
User user = new User("dai", 22);
IndexRequest request = new IndexRequest("index1")
.id("1")
.timeout(TimeValue.timeValueSeconds(1));
IndexRequest source = request.source(JSON.toJSONString(user), XContentType.JSON);
IndexResponse indexResponse = client.index(request, RequestOptions.DEFAULT);
System.out.println(indexResponse.toString());
System.out.println(indexResponse.status());
}
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删除文档
//删除文档
@Test
void deleteDocument() throws IOException {
DeleteRequest request = new DeleteRequest("index1", "2");
request.timeout("1s");
DeleteResponse deleteResponse = client.delete(request, RequestOptions.DEFAULT);
System.out.println(deleteResponse.status());
}
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查询文档是否存在
//判断文档是否存在
@Test
void isExistDocument() throws IOException {
GetRequest request = new GetRequest("index1", "1");
//不获取_source内容,提升效率
request.fetchSourceContext(new FetchSourceContext(false));
request.storedFields("_none_");
boolean exists = client.exists(request, RequestOptions.DEFAULT);
System.out.println(exists);
}
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更新文档
//更新文档
@Test
void updateDocument() throws IOException {
UpdateRequest request = new UpdateRequest("index1", "1");
request.timeout("1s");
User user = new User("dai2", 22);
request.doc(JSON.toJSONString(user), XContentType.JSON);
UpdateResponse updateResponse = client.update(request, RequestOptions.DEFAULT);
System.out.println(updateResponse.status());
}
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数据（datas）
批量插入数据
//批量插入数据
@Test
void BulkRequest() throws IOException {
BulkRequest bulkRequest = new BulkRequest()
.timeout("5s");
List<User> users = Arrays.asList(new User("dai1", 1), new User("dai2", 2), new User("dai3", 3));
for (User user : users) {
bulkRequest.add(new IndexRequest("index1")
//.id("xxx")
.source(JSON.toJSONString(user), XContentType.JSON));
}
BulkResponse bulkResponse = client.bulk(bulkRequest, RequestOptions.DEFAULT);
//是否失败,false表示成功
System.out.println(bulkResponse.hasFailures());
System.out.println(bulkResponse.status());
}
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查询
//查询
@Test
void search() throws IOException {
SearchRequest request = new SearchRequest("index1");
//构建搜索条件
SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
// SearchRequest 搜索请求
// SearchSourceBuilder 条件构造
// HighlightBuilder 构建高亮
// TermQueryBuilder 精确查询
// MatchAllQueryBuilder .....
MatchAllQueryBuilder matchAllQueryBuilder = QueryBuilders.matchAllQuery();
sourceBuilder.query(matchAllQueryBuilder)
.timeout(new TimeValue(60, TimeUnit.SECONDS));
request.source(sourceBuilder);
SearchResponse searchResponse = client.search(request, RequestOptions.DEFAULT);
System.out.println(JSON.toJSONString(searchResponse.getHits(), true));
System.out.println("===================================");
for (SearchHit documentFields : searchResponse.getHits()) {
System.out.println(documentFields.getSourceAsMap());
}
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======================================================================================
我使用的是Elasticsearch7.2.0，由于官网上推荐使用elasticsearch-rest-high-level-client端集成在springboot所以尝试爬坑。
首先直接引入官网的配置文件
<dependency>
<groupId>org.elasticsearch.client</groupId>
<artifactId>elasticsearch-rest-high-level-client</artifactId>
<version>7.2.0</version>
</dependency>然后在运行时报错：
...
...
Caused by: java.lang.ClassNotFoundException: org.elasticsearch.common.xcontent.DeprecationHandler
...
...百度了一下说jar里的Elasticsearch版本有错，要移除了再重新引入，所以把配置文件改成下面的样子
<dependency>
<groupId>org.elasticsearch.client</groupId>
<artifactId>elasticsearch-rest-high-level-client</artifactId>
<version>7.2.0</version>
<exclusions>
<exclusion>
<groupId>org.elasticsearch</groupId>
<artifactId>elasticsearch</artifactId>
</exclusion>
</exclusions>
</dependency>
<!-- 正确版本 -->
<dependency>
<groupId>org.elasticsearch</groupId>
<artifactId>elasticsearch</artifactId>
<version>7.2.0</version>
</dependency>然后再次启动，Elasticsearch正常运行，但是发现spring的rest服务运行不正常，配置的Filter没有正常运行，且不报错。网上找了很久也没有找到有类似错误的问题，后来反复查看官网，他说elasticsearch-rest-high-level-client是基于elasticsearch-rest-client的，我就猜这个基于会不会是依赖的意思呢？
于是把配置改成了这样：
<dependency>
<groupId>org.elasticsearch.client</groupId>
<artifactId>elasticsearch-rest-high-level-client</artifactId>
<version>7.2.0</version>
</dependency>
<dependency>
<groupId>org.elasticsearch.client</groupId>
<artifactId>elasticsearch-rest-client</artifactId>
<version>7.2.0</version>
</dependency>
<dependency>
<groupId>org.elasticsearch</groupId>
<artifactId>elasticsearch</artifactId>
<version>7.2.0</version>
</dependency>然后再次启动，Elasticsearch正常运行，REST服务也正常，我的老天鹅，终于可以了。
后来我找到了这篇文章Elasticsearch High Level REST Client，具体配置可以参考下
https://blog.csdn.net/mr_kidbk/article/details/105477095
https://my.oschina.net/u/3362856/blog/3109764
高亮查询
https://blog.csdn.net/qq_43750656/article/details/106752154