【微信642620018，获取全套课程】

Transport Client

1.创建transport client。

// on startup

Settings settings = Settings.builder()

.put("cluster.name", "myClusterName").build();

//Add transport addresses and do something with the client...

TransportClient client = new PreBuiltTransportClient(Settings.EMPTY)

.addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("host1"), 9300))

.addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("host2"), 9300));

// on shutdown

client.close();

2.添加参数，client.transport.sniff=true(默认是false，表示不开启集群嗅探功能)。

Settings settings = Settings.builder()

.put("client.transport.sniff", true).build();

TransportClient client = new PreBuiltTransportClient(settings);

备注：这仅是举例说明添加参数的方式，一般client.transport.sniff不需要修改，更多的细节请参考：ES5.6-transport-client。

Elasticsearch6.8.x

强烈建议使用Rest Client，使用Transport Client客户端连接不同版本的elasticsearch实例时，会存在兼容性问题，官方在elasticsearch8.0中不再支持Transport Client

Transport Client

1.创建transport client。

// on startup

Settings settings = Settings.builder()

.put("cluster.name", "myClusterName").build();

TransportClient client = new PreBuiltTransportClient(settings)

.addTransportAddress(new TransportAddress(InetAddress.getByName("host1"), 9300))

.addTransportAddress(new TransportAddress(InetAddress.getByName("host2"), 9300));

// on shutdown

client.close();

2.添加参数：client.transport.sniff=true(默认是false，表示不开启集群嗅探功能)。

Settings settings = Settings.builder()

.put("client.transport.sniff", true).build();

TransportClient client = new PreBuiltTransportClient(settings);

备注：这仅是举例说明添加参数的方式，一般client.transport.sniff不需要修改,更多的细节请参考,ES6.8-transport-client

Java High Level REST Client

依赖JDK版本1.8+，pom依赖需要添加。

org.elasticsearch.client

elasticsearch-rest-high-level-client

6.8.4

举个index，get，delete，update的简单例子：

RestHighLevelClient client = new RestHighLevelClient(

RestClient.builder(

new HttpHost("{elasticsearch集群地址}", 9200, "http")));

//index

Map jsonMap = new HashMap<>();

jsonMap.put("{filed1}", "{value1}");

jsonMap.put("{field2}", "{value2}");

IndexRequest indexRequest = new IndexRequest("{index}", "{type}", "{docid}")

.source(jsonMap);

IndexResponse indexResponse = client.index(indexRequest , RequestOptions.DEFAULT);

//get

GetRequest getRequest = new GetRequest(

"{index}",

"{type}",

"{docid}");

GetResponse getResponse = client.get(getRequest, RequestOptions.DEFAULT);

//delete

DeleteRequest deleteRequest = new DeleteRequest(

"{index}",

"{type}",

"{docid}");

DeleteResponse deleteResponse = client.delete(

deleteRequest, RequestOptions.DEFAULT);

//update

UpdateRequest updateRequest = new UpdateRequest("{index}", "{type}", "{docid}")

.doc(jsonMap);

UpdateResponse updateResponse = client.update(

updateRequest, RequestOptions.DEFAULT);

client.close();