Java使用elasticsearch基础API使用案例讲解

1.依赖

我用的是 springboot 2.2.5.RELEASE 版本，这里只贴出主要依赖：

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

2.配置+测试源码

这里根据elasticsearch服务端的地址进行配置：

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

以下是详细的测试代码：

@SpringBootTest
class EsApiApplicationTests {

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

	// 1.创建索引
	@Test
	void createIndex() throws IOException {
		// 创建请求
		CreateIndexRequest request = new CreateIndexRequest("yz_index");
		// 执行请求,获取响应
		CreateIndexResponse response = client.indices().create(request, RequestOptions.DEFAULT);
		System.out.println("creatIndex--" + response);
	}

	// 2.获取索引,判断是否存在
	@Test
	void getIndex() throws IOException {
		// 创建请求
		GetIndexRequest request = new GetIndexRequest("yz_index");
		// 执行请求,获取响应
		boolean exists = client.indices().exists(request, RequestOptions.DEFAULT);
		System.out.println("getIndex--exists--" + exists);
	}

	// 3.删除索引
	@Test
	void deleteIndex() throws IOException {
		// 创建请求
		DeleteIndexRequest request = new DeleteIndexRequest("yz_index");
		// 执行请求
		AcknowledgedResponse response = client.indices().delete(request, RequestOptions.DEFAULT);
		System.out.println("deleteIndex--" + response);
	}

	// 4.添加文档
	@Test
	void addDocument() throws IOException {
		// 创建对象
		User user = new User("Java虚拟机", 30);
		// 创建索引,即获取索引
		IndexRequest indexRequest = new IndexRequest("yz_index");
		// 添加规则 /index/_doc/id
		indexRequest.id("1");
		indexRequest.timeout(TimeValue.timeValueSeconds(1));
		// 存入对象
		indexRequest.source(JSON.toJSONString(user), XContentType.JSON);
		// 发送请求
		IndexResponse response = client.index(indexRequest, RequestOptions.DEFAULT);
		System.out.println("addDocument--" + response);
	}

	// 5.获取文档是否存在
	@Test
	void getDocument() throws IOException {
		// 创建get请求
		GetRequest getRequest = new GetRequest("yz_index", "1");
		// 不获取返回的_source的上下文
		getRequest.fetchSourceContext(new FetchSourceContext(false));
		getRequest.storedFields("_none_");
		// 发送请求
		boolean exists = client.exists(getRequest, RequestOptions.DEFAULT);
		System.out.println("addDocument--" + exists);

		// 6.获取文档信息
		if (exists) {
			// 创建请求
			GetRequest getRequest1 = new GetRequest("yz_index", "1");
			// 发送请求
			GetResponse response = client.get(getRequest1, RequestOptions.DEFAULT);
			System.out.println("source--" + response.getSource());
			System.out.println("getDocument--" + response.getSourceAsString());
		}

		// 7.更新文档信息
		if (exists) {
			// 创建请求
			UpdateRequest updateRequest = new UpdateRequest("yz_index", "1");
			updateRequest.timeout("1s");
			// 修改内容
			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.删除文档信息
		if (exists) {
			// 创建请求
			DeleteRequest deleteRequest = new DeleteRequest("yz_index", "1");
			deleteRequest.timeout("1s");
			// 修改内容
			DeleteResponse response = client.delete(deleteRequest, RequestOptions.DEFAULT);
			System.out.println("deleteDocument--" + response.status());
		}
	}

	// 9.批量添加文档
	@Test
	void batchAddDocument() throws IOException {
		// 批量请求
		BulkRequest bulkRequest = new BulkRequest();
		bulkRequest.timeout("10s");
		// 创建对象
		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));
		// 添加请求
		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));
		}
		// 执行请求
		BulkResponse response = client.bulk(bulkRequest, RequestOptions.DEFAULT);
		System.out.println("batchAddDocument--" + response.status());
	}

	// 10.查询
	@Test
	void search() throws IOException {
		// 创建请求
		SearchRequest searchRequest = new SearchRequest("jd_index");
		// 构建搜索条件
		SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
		TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("title", "杜伽");// 精确查询
		searchSourceBuilder.query(termQueryBuilder);
		searchSourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS));
		searchRequest.source(searchSourceBuilder);
		// 执行请求
		SearchResponse response = client.search(searchRequest, RequestOptions.DEFAULT);
		// 解析查询结果
		System.out.println("search--getHists--" + JSON.toJSONString(response.getHits()));
		for (SearchHit documentFields : response.getHits()) {
			System.out.println("search--getHist--" + documentFields.getSourceAsMap());
		}
	}
}

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