ES在java中的使用

ES

查询单个(String)

BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
boolQueryBuilder.filter(QueryBuilders.termQuery("id", test.getId()));

查询多个(List)

BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
boolQueryBuilder.must(QueryBuilders.termsQuery("status", test.getStatus()));

模糊查询

BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
boolQueryBuilder.must(QueryBuilders.wildcardQuery("value", "*" + test.getKeyword() + "*"));

大于

BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
boolQueryBuilder.filter(QueryBuilders.rangeQuery("createDt").gt(test.getCreateDtStart()));

小于

BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();           boolQueryBuilder.filter(QueryBuilders.rangeQuery("createDt").lt(test.getCreateDtEnd()));

查询

SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
sourceBuilder.query(boolQueryBuilder);
sourceBuilder.storedField("id");
SearchRequest searchRequest = new SearchRequest("testIndex");
searchRequest.source(sourceBuilder);
try {
    SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
    List<String> ids = new ArrayList<>();
    searchResponse.getHits().forEach(hit -> {
        String id = hit.field("id").getValue();
        if (StringUtils.isNotEmpty(id)) {
            ids.add(id);
        }
    });
} catch (Exception e) {
    throw new Exception();
}    

分页

sourceBuilder.from(Math.max(0, test.getPageIndex() - 1) * test.getPageSize());
sourceBuilder.size(test.getPageSize());

排序

// 正序
sourceBuilder.sort("create_dt", SortOrder.ASC);
// 倒序
sourceBuilder.sort("create_dt", SortOrder.DESC);
Java使用Elasticsearch需要遵循以下步骤: 1. 下载并安装Elasticsearch。 2. 在Java项目中添加ElasticsearchJava客户端库,可以使用Maven或Gradle等构建工具进行依赖管理。 3. 创建Elasticsearch客户端对象,连接到Elasticsearch服务器。 4. 创建索引和映射,定义文档结构。 5. 向索引中添加文档。 6. 执行查询操作,获取搜索结果。 以下是一个简单的Java代码示例,演示了如何连接到Elasticsearch服务器并执行一些基本操作: ```java import org.elasticsearch.client.RestHighLevelClient; import org.elasticsearch.client.indices.CreateIndexRequest; import org.elasticsearch.client.indices.CreateIndexResponse; import org.elasticsearch.common.settings.Settings; import org.elasticsearch.common.xcontent.XContentType; import org.elasticsearch.action.index.IndexRequest; import org.elasticsearch.action.index.IndexResponse; import org.elasticsearch.action.search.SearchRequest; import org.elasticsearch.action.search.SearchResponse; import org.elasticsearch.action.search.SearchType; import org.elasticsearch.index.query.QueryBuilders; import org.elasticsearch.search.builder.SearchSourceBuilder; public class ElasticsearchExample { private static final String INDEX_NAME = "my_index"; private static final String DOCUMENT_TYPE = "my_type"; public static void main(String[] args) throws Exception { RestHighLevelClient client = new RestHighLevelClient(/* Elasticsearch连接配置 */); // 创建索引 CreateIndexRequest request = new CreateIndexRequest(INDEX_NAME); request.settings(Settings.builder().put("index.number_of_shards", 1).put("index.number_of_replicas", 0)); request.mapping(DOCUMENT_TYPE, "{\n" + " \"properties\": {\n" + " \"title\": {\n" + " \"type\": \"text\"\n" + " },\n" + " \"content\": {\n" + " \"type\": \"text\"\n" + " }\n" + " }\n" + "}", XContentType.JSON); CreateIndexResponse createIndexResponse = client.indices().create(request); // 添加文档 IndexRequest indexRequest = new IndexRequest(INDEX_NAME, DOCUMENT_TYPE, "1"); indexRequest.source("{ \"title\": \"Java编程\", \"content\": \"Java是一种面向对象的编程语言。\" }", XContentType.JSON); IndexResponse indexResponse = client.index(indexRequest); // 搜索文档 SearchRequest searchRequest = new SearchRequest(INDEX_NAME); searchRequest.searchType(SearchType.DFS_QUERY_THEN_FETCH); SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder(); searchSourceBuilder.query(QueryBuilders.matchQuery("content", "编程")); searchRequest.source(searchSourceBuilder); SearchResponse searchResponse = client.search(searchRequest); // 处理搜索结果 // ... // 关闭客户端连接 client.close(); } } ``` 请注意,上述示例中的代码只是一个简单的演示,实际情况下,您需要更加详细地了解Elasticsearch的API和查询语法,以便更好地使用它。
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