ElasticSearch与Java集成：掌握REST API和Java客户端

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RestHighLevelClient
        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 with Java High Level REST Client\"" +
                    "}";
            request.source(jsonString, XContentType.JSON);
 
            // 执行索引请求
            IndexResponse indexResponse = client.index(request, RequestOptions.DEFAULT);
 
            // 打印索引响应
            System.out.println("Index Response Status:" + indexResponse.getResult());
            System.out.println("Index Response Index:" + indexResponse.getIndex());
            System.out.println("Index Response Type:" + indexResponse.getType());
            System.out.println("Index Response ID:" + indexResponse.getId());
            System.out.println("Index Response Version:" + indexResponse.getVersion());
            System.out.println("Index Response Result:" + indexResponse.getResult());
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            // 关闭RestHighLevelClient
            try {
                client.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}

这段代码展示了如何使用Elasticsearch Java High Level REST Client来索引一个JSON文档。首先，它创建了一个RestHighLevelClient实例，然后构建了一个IndexRequest，设置了文档的索引名、ID和内容，并执行了请求。最后，它打印了响应结果，并在完成后关闭了客户端。这是一个简单的例子，展示了如何将Java与Elasticsearch集成，并通过REST API进行交互。