SpringBoot实现elasticsearch索引操作的代码示例

<dependency>
	<groupId>org.elasticsearch.client</groupId>
	<artifactId>elasticsearch-rest-high-level-client</artifactId>
	<version>7.12.1</version>
</dependency>

private RestHighLevelClient client;
void setUp() {
    this.client = new RestHighLevelClient(RestClient.builder(
            HttpHost.create("http://IP:9200")
    ));
}
void tearDown() throws IOException {
    this.client.close();
}

@RequestMapping("/create")
public String createHotelIndex() throws IOException {
    setUp();
    // 1.创建Request对象 "name" 是需要创建的索引名 一般在项目中只创建一次 所以这里是写死的
    CreateIndexRequest request = new CreateIndexRequest("name");
    // 2.准备请求的参数：DSL语句
    request.source(MAPPING_TEMPLATE, XContentType.JSON);
    // 3.发送请求
    CreateIndexResponse createIndexResponse = client.indices().create(request, RequestOptions.DEFAULT);
    tearDown();
    return createIndexResponse.isAcknowledged() ? "创建成功" : "创建失败";
}

@RequestMapping("/testExistsHotelIndex/{indexName}")
public String testExistsHotelIndex(@PathVariable("indexName") String indexName) throws IOException {
	setUp();
	// 1.创建Request对象
	GetIndexRequest request = new GetIndexRequest(indexName);
	// 2.发送请求
	boolean exists = client.indices().exists(request, RequestOptions.DEFAULT);
	tearDown();
	return exists ? "索引库已经存在！" : "索引库不存在！";
}

@RequestMapping("/testDeleteHotelIndex")
void testDeleteHotelIndex() throws IOException {
    setUp();
    // 1.创建Request对象
    DeleteIndexRequest request = new DeleteIndexRequest("索引名称");
    // 2.发送请求
    client.indices().delete(request, RequestOptions.DEFAULT);
    tearDown();
}

@RequestMapping("/addAll")
public List<HotelDoc> addAll() throws IOException {
    List<Hotel> list = hotelService.list();
    List<HotelDoc> docList = list.stream().map(p -> new HotelDoc(p)).collect(Collectors.toList());
    setUp();
    for (HotelDoc hotelDoc : docList) {
        String jsonString = JSON.toJSONString(hotelDoc);
        // 1.准备Request对象
        IndexRequest request = new IndexRequest("索引名称").id(hotelDoc.getId().toString());
        // 2.准备Json文档
        request.source(jsonString, XContentType.JSON);
        // 3.发送请求
        IndexResponse index = client.index(request, RequestOptions.DEFAULT);
        System.out.println(hotelDoc.getName() + ":" + index.status());
    }
    tearDown();
    return null;
}

@RequestMapping("/testBulkRequest")
public void testBulkRequest() throws IOException {
	List<Hotel> hotels = hotelService.list();
	setUp();
	// 1.创建Request
	BulkRequest request = new BulkRequest();
	// 2.准备参数，添加多个新增的Request
	for (Hotel hotel : hotels) {
		// 2.1.转换为文档类型HotelDoc
		HotelDoc hotelDoc = new HotelDoc(hotel);
		// 2.2.创建新增文档的Request对象
		request.add(new IndexRequest("索引名称")
			.id(hotelDoc.getId().toString())
			.source(JSON.toJSONString(hotelDoc), XContentType.JSON));
	}
	// 3.发送请求
	client.bulk(request, RequestOptions.DEFAULT);
	tearDown();
}