Java使用elasticsearch基礎API使用（配置+API測驗原始碼）

1.依賴

我用的是 springboot 2.2.5.RELEASE 版本，這里只貼出主要依賴：

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-elasticsearch</artifactId>
		</dependency>

2.配置+測驗原始碼

這里根據elasticsearch服務端的地址進行配置：

@Configuration
public class ElasticSearchConfig {
    @Bean
    public RestHighLevelClient restHighLevelClient() {
        RestHighLevelClient client = new RestHighLevelClient(
                RestClient.builder(
                        new HttpHost("127.0.0.1", 9200, "http")
                ));
        return client;
    }
}

以下是詳細的測驗代碼：

@SpringBootTest
class EsApiApplicationTests {

	@Autowired
	@Qualifier(value = "restHighLevelClient")
	private RestHighLevelClient client;

	/*1.創建索引*/
	@Test
	void createIndex() throws IOException {
		// 創建請求
		CreateIndexRequest request = new CreateIndexRequest("yz_index");
		// 執行請求,獲取回應
		CreateIndexResponse response = client.indices().create(request, RequestOptions.DEFAULT);
		System.out.println("creatIndex--" + response);
	}

	/*2.獲取索引,判斷是否存在*/
	@Test
	void getIndex() throws IOException {
		// 創建請求
		GetIndexRequest request = new GetIndexRequest("yz_index");
		// 執行請求,獲取回應
		boolean exists = client.indices().exists(request, RequestOptions.DEFAULT);
		System.out.println("getIndex--exists--" + exists);
	}

	/*3.洗掉索引*/
	@Test
	void deleteIndex() throws IOException {
		// 創建請求
		DeleteIndexRequest request = new DeleteIndexRequest("yz_index");
		// 執行請求
		AcknowledgedResponse response = client.indices().delete(request, RequestOptions.DEFAULT);
		System.out.println("deleteIndex--" + response);
	}

	/*4.添加檔案*/
	@Test
	void addDocument() throws IOException {
		// 創建物件
		User user = new User("Java虛擬機", 30);
		// 創建索引,即獲取索引
		IndexRequest indexRequest = new IndexRequest("yz_index");
		// 添加規則 /index/_doc/id
		indexRequest.id("1");
		indexRequest.timeout(TimeValue.timeValueSeconds(1));
		// 存入物件
		indexRequest.source(JSON.toJSONString(user), XContentType.JSON);
		// 發送請求
		IndexResponse response = client.index(indexRequest, RequestOptions.DEFAULT);
		System.out.println("addDocument--" + response);
	}

	/*5.獲取檔案是否存在*/
	@Test
	void getDocument() throws IOException {
		// 創建get請求
		GetRequest getRequest = new GetRequest("yz_index", "1");
		// 不獲取回傳的_source的背景關系
		getRequest.fetchSourceContext(new FetchSourceContext(false));
		getRequest.storedFields("_none_");
		// 發送請求
		boolean exists = client.exists(getRequest, RequestOptions.DEFAULT);
		System.out.println("addDocument--" + exists);

		/*6.獲取檔案資訊*/
		if (exists) {
			// 創建請求
			GetRequest getRequest1 = new GetRequest("yz_index", "1");
			// 發送請求
			GetResponse response = client.get(getRequest1, RequestOptions.DEFAULT);
			System.out.println("source--" + response.getSource());
			System.out.println("getDocument--" + response.getSourceAsString());
		}

		/*7.更新檔案資訊*/
		if (exists) {
			// 創建請求
			UpdateRequest updateRequest = new UpdateRequest("yz_index", "1");
			updateRequest.timeout("1s");
			// 修改內容
			User user = new User("小米", 10);
			updateRequest.doc(JSON.toJSONString(user), XContentType.JSON);
			UpdateResponse response = client.update(updateRequest, RequestOptions.DEFAULT);
			System.out.println("updateDocument--" + response.status());
		}

		/*8.洗掉檔案資訊*/
		if (exists) {
			// 創建請求
			DeleteRequest deleteRequest = new DeleteRequest("yz_index", "1");
			deleteRequest.timeout("1s");
			// 修改內容
			DeleteResponse response = client.delete(deleteRequest, RequestOptions.DEFAULT);
			System.out.println("deleteDocument--" + response.status());
		}
	}

	/*9.批量添加檔案*/
	@Test
	void batchAddDocument() throws IOException {
		// 批量請求
		BulkRequest bulkRequest = new BulkRequest();
		bulkRequest.timeout("10s");
		// 創建物件
		ArrayList<User> userArrayList = new ArrayList<>();
		userArrayList.add(new User("小米1", 1));
		userArrayList.add(new User("小米2", 2));
		userArrayList.add(new User("小米3", 3));
		userArrayList.add(new User("小米4", 4));
		userArrayList.add(new User("小米5", 5));
		// 添加請求
		for (int i = 0; i < userArrayList.size(); i++) {
			bulkRequest.add(new IndexRequest("yz_index")
					.id("" + (i + 2))
					.source(JSON.toJSONString(userArrayList.get(i)), XContentType.JSON));
		}
		// 執行請求
		BulkResponse response = client.bulk(bulkRequest, RequestOptions.DEFAULT);
		System.out.println("batchAddDocument--" + response.status());
	}

	/*10.查詢*/
	@Test
	void search() throws IOException {
		// 創建請求
		SearchRequest searchRequest = new SearchRequest("jd_index");
		// 構建搜索條件
		SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
		TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("title", "杜伽");// 精確查詢
		searchSourceBuilder.query(termQueryBuilder);
		searchSourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS));
		searchRequest.source(searchSourceBuilder);
		// 執行請求
		SearchResponse response = client.search(searchRequest, RequestOptions.DEFAULT);
		// 決議查詢結果
		System.out.println("search--getHists--" + JSON.toJSONString(response.getHits()));
		for (SearchHit documentFields : response.getHits()) {
			System.out.println("search--getHist--" + documentFields.getSourceAsMap());
		}
	}
}