Elasticsearch 7.x入门学习-Java API操作

import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestClientBuilder;
import org.elasticsearch.action.index.IndexRequest;
import org.elasticsearch.action.index.IndexResponse;
import org.elasticsearch.common.xcontent.XContentType;
 
public class ElasticsearchExample {
    public static void main(String[] args) {
        // 初始化Elasticsearch客户端
        RestClientBuilder builder = RestClient.builder(
                new HttpHost("localhost", 9200, "http"));
        RestHighLevelClient client = new RestHighLevelClient(builder);
 
        try {
            // 创建索引请求
            IndexRequest request = new IndexRequest("posts");
            // 设置索引数据
            String jsonString = "{" +
                    "\"user\":\"kimchy\"," +
                    "\"postDate\":\"2023-04-07\"," +
                    "\"message\":\"trying out Elasticsearch\"" +
                    "}";
            request.source(jsonString, XContentType.JSON);
 
            // 执行请求，并获取响应
            IndexResponse indexResponse = client.index(request, RequestOptions.DEFAULT);
 
            // 打印索引操作的结果
            System.out.println("索引创建成功！");
            System.out.println("文档索引: " + indexResponse.getIndex());
            System.out.println("文档ID: " + indexResponse.getId());
            System.out.println("版本号: " + indexResponse.getVersion());
            System.out.println("结果: " + indexResponse.getResult());
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            // 关闭客户端
            try {
                client.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}

这段代码展示了如何使用Java High Level REST Client在Elasticsearch中创建一个索引。首先，我们初始化了一个RestHighLevelClient客户端，然后创建了一个IndexRequest对象，并设置了要索引的数据。接着，我们执行了这个请求并打印了响应结果。最后，在操作完成后关闭了客户端以释放资源。