java 连接 Elasticsearch 使用 RestHighLevelClient 进行插入、删除、修改、查询数据

依赖

<!-- elasticsearch-rest-client -->
<dependency>
    <groupId>org.elasticsearch.client</groupId>
    <artifactId>elasticsearch-rest-client</artifactId>
    <version>7.13.3</version>
</dependency>
<!-- elasticsearch-rest-high-level-client -->
<dependency>
    <groupId>org.elasticsearch.client</groupId>
    <artifactId>elasticsearch-rest-high-level-client</artifactId>
    <version>7.13.3</version>
</dependency>

配置

@Configuration
public class ESConfig {

    @Bean
    public RestHighLevelClient getRestHighLevelClient(){
        HttpHost http1 = new HttpHost("127.0.0.1", 9200, "http");
        HttpHost http2 = new HttpHost("127.0.0.1", 9201, "http");
        RestClientBuilder restClientBuilder = RestClient.builder(http1, http2);
        RestHighLevelClient restHighLevelClient = new RestHighLevelClient(restClientBuilder);
        return restHighLevelClient;
    }

}

@Autowired
private RestHighLevelClient restHighLevelClient;

插入或更新数据

public void insertOrUpdateData() throws IOException {
    HashMap<String, String> map = new HashMap<>();
    map.put("name", "dd df ff");
map.put("age", "16");

IndexRequest indexRequest = new IndexRequest("myindex");
//设置ID
indexRequest.id("9");
//添加数据
indexRequest.source(map);

    restHighLevelClient.indexAsync(indexRequest,
            RequestOptions.DEFAULT,
            new ActionListener<IndexResponse>() {
                @Override
                public void onResponse(IndexResponse indexResponse) {
                    RestStatus status = indexResponse.status();
                    System.out.println(status.name());
                    if (indexResponse.getResult() == DocWriteResponse.Result.CREATED) {
                        System.out.println("创建成功");
                    } else if (indexResponse.getResult() == DocWriteResponse.Result.UPDATED) {
      ## 标题                  System.out.println("更新成功");
                    }
                }
                @Override
                public void onFailure(Exception e) {
                    System.out.println("出异常了");
                }
            });
}

删除数据

public void deleteData() throws IOException {
    DeleteRequest deleteRequest = new DeleteRequest("myindex");
    deleteRequest.id("1");
deleteRequest.timeout(TimeValue.timeValueMinutes(2));

    DeleteResponse deleteResponse = restHighLevelClient.delete(
            deleteRequest, RequestOptions.DEFAULT);
    if (deleteResponse.getResult() == DocWriteResponse.Result.NOT_FOUND) {
        System.out.println("未找到需要删除的数据");
    }
}

更新数据

public void updateData() throws IOException {
    Map<String, Object> parameters = new HashMap<>();
parameters.put("count", 4);

    Script script = new Script(ScriptType.INLINE, "painless",
            "ctx._source.field += params.count", parameters);

    UpdateRequest updateRequest = new UpdateRequest("myindex", "2");
    updateRequest.script(script);
    UpdateResponse updateResponse = restHighLevelClient.update(updateRequest, RequestOptions.DEFAULT);
    DocWriteResponse.Result result = updateResponse.getResult();
    if (result == DocWriteResponse.Result.CREATED) {
        System.out.println("created");
    } else if (result == DocWriteResponse.Result.UPDATED) {
        System.out.println("updated");
    } else if (result == DocWriteResponse.Result.DELETED) {
        System.out.println("deleted");
    } else if (result == DocWriteResponse.Result.NOOP) {
        System.out.println("noop");
    }
}

单条查询数据

public void getOneData() throws IOException {
    String[] includes = Strings.EMPTY_ARRAY;
    String[] excludes = Strings.EMPTY_ARRAY;
    FetchSourceContext fetchSourceContext =
            new FetchSourceContext(true, includes, excludes);

    GetRequest getRequest = new GetRequest("myindex");
    getRequest.id("9");
getRequest.fetchSourceContext(fetchSourceContext);

    boolean exists = restHighLevelClient.exists(getRequest, RequestOptions.DEFAULT);
    if (exists) {
        System.out.println("有数据");
    }
    GetResponse response = restHighLevelClient.get(getRequest, RequestOptions.DEFAULT);
    if (response.isExists()) {
        Map<String, Object> sourceAsMap = response.getSourceAsMap();
        //获取索引名称
        String index = response.getIndex();
        //获取索引类型
        String type = response.getType();
        //获取索引id
        String id = response.getId();
        System.out.println("index:" + index);
        System.out.println("type:" + type);
        System.out.println("id:" + id);
        System.out.println(sourceAsMap);
    } else {
        System.out.println("没有数据");
    }
}

多条查询

public void multiQuery() throws IOException {
    MultiGetRequest multiGetRequest = new MultiGetRequest();
    multiGetRequest.add("myindex", "3");
    multiGetRequest.add("myindex", "5");
    MultiGetResponse multiGetResponse = restHighLevelClient
            .mget(multiGetRequest, RequestOptions.DEFAULT);
    MultiGetItemResponse[] responses = multiGetResponse.getResponses();
    Stream.of(responses).forEach(response -> {
        String id = response.getResponse().getId();
        String source = response.getResponse().getSourceAsString();
        System.out.println("id = " + id + " --> " + source);
    });
}