【elasticsearch】ES的JAVA工具类完整版（已完成，已测试）

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;
 
import java.io.IOException;
 
public class ElasticSearchJavaTool {
 
    private static RestHighLevelClient client;
 
    static {
        // 初始化Elasticsearch客户端
        RestClientBuilder builder = RestClient.builder(
                new HttpHost("localhost", 9200, "http"));
        client = new RestHighLevelClient(builder);
    }
 
    public static void main(String[] args) {
        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);
 
            // 执行操作
            IndexResponse indexResponse = client.index(request, RequestOptions.DEFAULT);
 
            // 打印结果
            System.out.println(indexResponse.toString());
            System.out.println("索引创建成功!");
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            // 关闭客户端
            try {
                if (client != null) {
                    client.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

这段代码展示了如何在Java中使用Elasticsearch的RestHighLevelClient来创建一个索引。首先，代码初始化了一个RestHighLevelClient实例，然后创建了一个IndexRequest对象，并设置了要索引的数据。接着，代码使用client.index方法执行了这个请求，并打印了响应结果。最后，代码确保在结束时关闭了客户端，释放资源。