请用java实现以下es查询语句,要求使用restHighLevelClient 7.x版本的: { "query": { "wildcard": { "encoding.keyword": "HHZ" } } }
时间: 2023-08-22 12:04:52 浏览: 152
java使用es查询的示例代码
好的,以下是使用 Java 实现的 Elasticsearch 查询语句:
```java
import org.apache.http.HttpHost;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.WildcardQueryBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.sort.SortOrder;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.search.SearchHit;
public class ElasticsearchQuery {
public static void main(String[] args) throws Exception {
// 创建 RestClient 实例
RestHighLevelClient client = new RestHighLevelClient(
RestClient.builder(new HttpHost("localhost", 9200, "http")));
try {
// 创建查询请求
SearchRequest searchRequest = new SearchRequest("your_index_name");
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
// 构建 wildcard 查询
WildcardQueryBuilder wildcardQuery = QueryBuilders.wildcardQuery("encoding.keyword", "HHZ");
// 将查询添加到查询请求中
searchSourceBuilder.query(wildcardQuery);
searchRequest.source(searchSourceBuilder);
// 执行查询请求
SearchResponse searchResponse = client.search(searchRequest);
// 处理查询结果
SearchHit[] searchHits = searchResponse.getHits().getHits();
for (SearchHit hit : searchHits) {
String sourceAsString = hit.getSourceAsString();
System.out.println(sourceAsString);
}
} finally {
// 关闭 RestClient 实例
client.close();
}
}
}
```
请将代码中的 `localhost` 和 `9200` 替换为你的 Elasticsearch 主机和端口号,将 `"your_index_name"` 替换为你要查询的索引名称。
这段代码使用了 `restHighLevelClient` 7.x 版本的 Java 客户端库来实现 Elasticsearch 查询。它创建了一个 `RestHighLevelClient` 实例,并使用 `WildcardQueryBuilder` 构建了一个通配符查询。然后将查询添加到查询请求中,并执行查询请求。最后,处理查询结果并打印出来。
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