JAVA获取ES连接并查询所有数据

xrz2772025-06-04 11:37

我们的项目要获取es连接，新版本和旧版本有不小的区别，在8.17.0版本使用的是

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ElasticsearchClient

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<dependency>
    <groupId>co.elastic.clients</groupId>
    <artifactId>elasticsearch-java</artifactId>
    <version>8.17.0</version> <!-- 使用最新版本 -->
</dependency>

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.15.2</version>
</dependency>

初始化代码

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File certFile = new File(caPath);
        SSLContext sslContext = TransportUtils.sslContextFromHttpCaCrt(certFile);
        BasicCredentialsProvider credsProv = new BasicCredentialsProvider();
        credsProv.setCredentials(
                AuthScope.ANY, new UsernamePasswordCredentials(esUserName, esPwd)
        );
        RestClient restClient = RestClient
                .builder(new HttpHost(esHost, esPort, esHttpType))
                .setHttpClientConfigCallback(hc -> hc
                        .setSSLContext(sslContext)
                        .setDefaultCredentialsProvider(credsProv)
                        .setSSLHostnameVerifier(NoopHostnameVerifier.INSTANCE)
                )
                .build();
        ElasticsearchTransport transport = new RestClientTransport(restClient, new JacksonJsonpMapper());
        ElasticsearchClient client = new ElasticsearchClient(transport);

循环获取代码

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SearchResponse<Object> searchResponse = client.search(searchRequest, Object.class);// 执行初始搜索
        List<Hit<Object>> hits = searchResponse.hits().hits();// 获取命中的文档列表

        String scrollId = searchResponse.scrollId();
        // 2. 循环获取所有结果
        boolean isEmpty = false;
        while (scrollId != null && !isEmpty) {
            String finalScrollId1 = scrollId;
            ScrollResponse<Object> scrollResponse = client.scroll(s -> s
                            .scrollId(finalScrollId1)
                            .scroll(Time.of(b -> b.time("30s")))
                    , Object.class);

            scrollId = scrollResponse.scrollId();
            List<Hit<Object>> scrollHits = scrollResponse.hits().hits();
            
        }

        // 最后清除 scroll 上下文
        String finalScrollId = scrollId;
        client.clearScroll(c -> c.scrollId(finalScrollId));
        client.close();
        writer.flush();
        writer.close();

重点关注循环获取数据的内容，通过AI搜索的不一定对，这是经过修改之后的。