java 查询es数据_es之java各种查询操作

Java 查询 Elasticsearch 数据可以通过 Elasticsearch Java High Level REST Client 实现。以下是一些查询操作的示例：

1. 查询所有文档

SearchRequest searchRequest = new SearchRequest("index_name");
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
searchSourceBuilder.query(QueryBuilders.matchAllQuery());
searchRequest.source(searchSourceBuilder);

SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);

2. 匹配查询

SearchRequest searchRequest = new SearchRequest("index_name");
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
searchSourceBuilder.query(QueryBuilders.matchQuery("field_name", "search_text"));
searchRequest.source(searchSourceBuilder);

SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);

3. 多字段匹配查询

SearchRequest searchRequest = new SearchRequest("index_name");
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
searchSourceBuilder.query(QueryBuilders.multiMatchQuery("search_text", "field_name1", "field_name2"));
searchRequest.source(searchSourceBuilder);

SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);

4. 范围查询

SearchRequest searchRequest = new SearchRequest("index_name");
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
searchSourceBuilder.query(QueryBuilders.rangeQuery("field_name").gte("start_value").lte("end_value"));
searchRequest.source(searchSourceBuilder);

SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);

5. 前缀查询

SearchRequest searchRequest = new SearchRequest("index_name");
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
searchSourceBuilder.query(QueryBuilders.prefixQuery("field_name", "prefix_text"));
searchRequest.source(searchSourceBuilder);

SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);

以上是一些常用的 Elasticsearch 查询操作的示例代码。根据实际需求，可以结合 Elasticsearch 的查询语法和 API 进行灵活的查询操作。