基于SpringBoot通过RestHighLevelClient实现Elasticsearch的CRUD

最新推荐文章于 2024-04-22 18:36:37 发布

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最新推荐文章于 2024-04-22 18:36:37 发布

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分类专栏： Elasticsearch 文章标签： elasticsearch spring java

本文链接：https://blog.youkuaiyun.com/hellow0rd/article/details/107963453

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本文详细介绍了如何使用Spring管理RestHighLevelClient对象，包括创建、查询、更新、插入和删除等核心操作。涵盖条件查询、分页查询、嵌套查询及字段为空查询等多种场景。

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创建RestHighLevelClient对象，通过Spring来管理restHighLevelClient对象

    @Bean
    public RestClientBuilder restClientBuilder() {
        List<Map<String, Object>> addressList = new ArrayList<>();
         map = new HashMap<>();
         map.put("host", 172.0.0.1);
         map.put("port", 9200);
         list.add(map);//如果是集群则将集群所有ip和端口号分别装入list
        HttpHost[] hosts = new HttpHost[addressList.size()];
        if (CollectionUtils.isNotEmpty(addressList)) {
            for (int i = 0; i < addressList.size(); i++) {
                Map map = addressList.get(i);
                hosts[i] = new HttpHost((String) map.get("host"), Integer.valueOf((String) map.get("port")), "http");
            }
        }
        return RestClient.builder(hosts);
    }

    @Bean("restHighLevelClient")
    public RestHighLevelClient highLevelClient(@Autowired RestClientBuilder restClientBuilder) {
        return new RestHighLevelClient(restClientBuilder);
    }

查询操作
设置index类型和type类型

SearchRequest searchRequest = new SearchRequest(“index”);
        searchRequest.types("type");
QueryBuilder queryBuilder = QueryBuilders.idsQuery().addIds(id);

1.根据id进行查询

SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        sourceBuilder.query(queryBuilder);
        searchRequest.source(sourceBuilder);
        SearchResponse searchResponse = null;
        String sourceAsString;
        try {
            searchResponse = restHighLevelClient.search(searchRequest);
        } catch (IOException e) {
            System.out.println(e);
        }

2.条件查询

 BoolQueryBuilder boolQueryBuilder = boolQuery();
        boolQueryBuilder.must(QueryBuilders.matchQuery("查询的字段", "查询条件"));
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        sourceBuilder.query(boolQueryBuilder);
        searchRequest.source(sourceBuilder);
        SearchResponse search;
        try {
            search = restHighLevelClient.search(searchRequest);
        } catch (IOException e) {
            System.out.println(e);
        }

查询对象中的字段或对象中为集合，查询对象中的集合中对象的字段

	 BoolQueryBuilder boolQueryBuilder = boolQuery();
        boolQueryBuilder.must(QueryBuilders.matchQuery("对象.字段", "查询条件"));
        boolQueryBuilder.must(QueryBuilders.matchQuery("对象.对象中的集合中对象的字段", "查询条件"));
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        sourceBuilder.query(boolQueryBuilder);
        searchRequest.source(sourceBuilder);
        SearchResponse search;
        try {
            search = restHighLevelClient.search(searchRequest);
        } catch (IOException e) {
            System.out.println(e);
        }

4.查询某字段为null或不为null

 BoolQueryBuilder boolQueryBuilder = boolQuery();
	//查询不为null的
	boolQueryBuilder.must(QueryBuilders.existsQuery("字段名"));
	//查询为null的
	boolQueryBuilder.mustNot(QueryBuilders.existsQuery("字段名"));
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        sourceBuilder.query(boolQueryBuilder);
        searchRequest.source(sourceBuilder);
        SearchResponse search;
        try {
            search = restHighLevelClient.search(searchRequest);
        } catch (IOException e) {
            System.out.println(e);
        }

5.嵌套查询

 BoolQueryBuilder boolQueryBuilder = boolQuery();
	boolQueryBuilder.must(QueryBuilders.nestedQuery("字段名",
						QueryBuilders.matchQuery("字段名.字段名", "查询条件")));
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        sourceBuilder.query(boolQueryBuilder);
        searchRequest.source(sourceBuilder);
        SearchResponse search;
        try {
            search = restHighLevelClient.search(searchRequest);
        } catch (IOException e) {
            System.out.println(e);
        }

6.分页查询

        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        //开始索引
        sourceBuilder.from(0);
        //每页条数
        sourceBuilder.size(10);
        searchRequest.source(sourceBuilder);
        SearchResponse search;
        try {
            search = restHighLevelClient.search(searchRequest);
        } catch (IOException e) {
            System.out.println(e);
        }

更新操作
通过查询条件查询出需要修改数据的id，根据id进行修改

    UpdateRequest updateRequest = new UpdateRequest("index", "type", id);
        updateRequest.doc("要更新的json", XContentType.JSON);
        try {
            UpdateResponse updateResponse = restHighLevelClient.update(updateRequest);
        } catch (IOException e) {
            System.out.println(e);
        }

-插入操作

        IndexRequest indexRequest = new IndexRequest("index","type");
        indexRequest.source("要插入的json", XContentType.JSON);
        try {
            restHighLevelClient.index(indexRequest);
        } catch (IOException e) {
            System.out.println(e);
        }

-删除操作
通过查询条件查询出需要修改数据的id，根据id进行删除

		BulkRequest bulkRequest = new BulkRequest();
        DeleteRequest deleteRequest = new DeleteRequest("index","type",id);
     	bulkRequest.add(deleteRequest);
        try {
            restHighLevelClient.bulk(bulkRequest);
        } catch (IOException e) {
            System.out.println(e);
        }