这期内容当中小编将会给大家带来有关使用java怎么对elasticsearch进行操作，文章内容丰富且以专业的角度为大家分析和叙述，阅读完这篇文章希望大家可以有所收获。
Java操作es集群步骤1：配置集群对象信息；2：创建客户端；3：查看集群信息
集群名称
默认集群名为elasticsearch，如果集群名称和指定的不一致则在使用节点资源时会报错。
嗅探功能
通过client.transport.sniff启动嗅探功能，这样只需要指定集群中的某一个节点(不一定是主节点)，然后会加载集群中的其他节点，这样只要程序不停即使此节点宕机仍然可以连接到其他节点。
查询类型SearchType.QUERY_THEN_FETCH
es 查询共有4种查询类型
QUERY_AND_FETCH:
主节点将查询请求分发到所有的分片中，各个分片按照自己的查询规则即词频文档频率进行打分排序，然后将结果返回给主节点，主节点对所有数据进行汇总排序然后再返回给客户端，此种方式只需要和es交互一次。
这种查询方式存在数据量和排序问题，主节点会汇总所有分片返回的数据这样数据量会比较大，二是各个分片上的规则可能不一致。
QUERY_THEN_FETCH:
主节点将请求分发给所有分片，各个分片打分排序后将数据的id和分值返回给主节点，主节点收到后进行汇总排序再根据排序后的id到对应的节点读取对应的数据再返回给客户端，此种方式需要和es交互两次。
这种方式解决了数据量问题但是排序问题依然存在而且是es的默认查询方式
DEF_QUERY_AND_FETCH: 和 DFS_QUERY_THEN_FETCH:
将各个分片的规则统一起来进行打分。解决了排序问题但是DFS_QUERY_AND_FETCH仍然存在数据量问题，DFS_QUERY_THEN_FETCH两种噢乖你问题都解决但是效率是最差的。
1, 获取client, 两种方式获取
@Before public void before() throws Exception { Map<String, String> map = new HashMap<String, String>(); map.put("cluster.name", "elasticsearch_wenbronk"); Settings.Builder settings = Settings.builder().put(map); client = TransportClient.builder().settings(settings).build() .addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("www.wenbronk.com"), Integer.parseInt("9300"))); }@Before public void before11() throws Exception { // 创建客户端, 使用的默认集群名, "elasticSearch"// client = TransportClient.builder().build()// .addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("www.wenbronk.com"), 9300)); // 通过setting对象指定集群配置信息, 配置的集群名 Settings settings = Settings.settingsBuilder().put("cluster.name", "elasticsearch_wenbronk") // 设置集群名// .put("client.transport.sniff", true) // 开启嗅探 , 开启后会一直连接不上, 原因未知// .put("network.host", "192.168.50.37") .put("client.transport.ignore_cluster_name", true) // 忽略集群名字验证, 打开后集群名字不对也能连接上// .put("client.transport.nodes_sampler_interval", 5) //报错,// .put("client.transport.ping_timeout", 5) // 报错, ping等待时间, .build(); client = TransportClient.builder().settings(settings).build() .addTransportAddress(new InetSocketTransportAddress(new InetSocketAddress("192.168.50.37", 9300))); // 默认5s // 多久打开连接, 默认5s System.out.println("success connect"); }PS: 官网给的2种方式都不能用, 需要合起来才能用, 浪费老子一下午...
其他参数的意义:
代码:
package com.wenbronk.javaes;import java.net.InetAddress;import java.net.InetSocketAddress;import java.util.Date;import java.util.HashMap;import java.util.List;import java.util.Map;import java.util.concurrent.TimeUnit;import org.elasticsearch.action.bulk.BackoffPolicy;import org.elasticsearch.action.bulk.BulkProcessor;import org.elasticsearch.action.bulk.BulkProcessor.Listener;import org.elasticsearch.action.bulk.BulkRequest;import org.elasticsearch.action.bulk.BulkRequestBuilder;import org.elasticsearch.action.bulk.BulkResponse;import org.elasticsearch.action.delete.DeleteRequest;import org.elasticsearch.action.delete.DeleteResponse;import org.elasticsearch.action.get.GetResponse;import org.elasticsearch.action.get.MultiGetItemResponse;import org.elasticsearch.action.get.MultiGetResponse;import org.elasticsearch.action.index.IndexRequest;import org.elasticsearch.action.index.IndexResponse;import org.elasticsearch.action.update.UpdateRequest;import org.elasticsearch.action.update.UpdateResponse;import org.elasticsearch.client.transport.TransportClient;import org.elasticsearch.cluster.node.DiscoveryNode;import org.elasticsearch.common.settings.Settings;import org.elasticsearch.common.transport.InetSocketTransportAddress;import org.elasticsearch.common.unit.ByteSizeUnit;import org.elasticsearch.common.unit.ByteSizeValue;import org.elasticsearch.common.unit.TimeValue;import org.elasticsearch.common.xcontent.XContentBuilder;import org.elasticsearch.common.xcontent.XContentFactory;import org.elasticsearch.script.Script;import org.junit.Before;import org.junit.Test;import com.alibaba.fastjson.JSONObject;public class JavaESTest { private TransportClient client; private IndexRequest source; // @Before public void before() throws Exception { Map<String, String> map = new HashMap<String, String>(); map.put("cluster.name", "elasticsearch_wenbronk"); Settings.Builder settings = Settings.builder().put(map); client = TransportClient.builder().settings(settings).build() .addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("www.wenbronk.com"), Integer.parseInt("9300"))); } @Test public void testInfo() { List<DiscoveryNode> nodes = client.connectedNodes(); for (DiscoveryNode node : nodes) { System.out.println(node.getHostAddress()); } } public String createJson1() { String json = "{" + "\"user\":\"kimchy\"," + "\"postDate\":\"2013-01-30\"," + "\"message\":\"trying out Elasticsearch\"" + "}"; return json; } public Map<String, Object> createJson2() { Map<String,Object> json = new HashMap<String, Object>(); json.put("user", "kimchy"); json.put("postDate", new Date()); json.put("message", "trying out elasticsearch"); return json; } public JSONObject createJson3() { JSONObject json = new JSONObject(); json.put("user", "kimchy"); json.put("postDate", new Date()); json.put("message", "trying out elasticsearch"); return json; } public XContentBuilder createJson4() throws Exception { // 创建json对象, 其中一个创建json的方式 XContentBuilder source = XContentFactory.jsonBuilder() .startObject() .field("user", "kimchy") .field("postDate", new Date()) .field("message", "trying to out ElasticSearch") .endObject(); return source; } @Test public void test1() throws Exception { XContentBuilder source = createJson4(); // 存json入索引中 IndexResponse response = client.prepareIndex("twitter", "tweet", "1").setSource(source).get();// // 结果获取 String index = response.getIndex(); String type = response.getType(); String id = response.getId(); long version = response.getVersion(); boolean created = response.isCreated(); System.out.println(index + " : " + type + ": " + id + ": " + version + ": " + created); } @Test public void testGet() {// GetResponse response = client.prepareGet("twitter", "tweet", "1")// .get(); GetResponse response = client.prepareGet("twitter", "tweet", "1") .setOperationThreaded(false) // 线程安全 .get(); System.out.println(response.getSourceAsString()); } @Test public void testDelete() { DeleteResponse response = client.prepareDelete("twitter", "tweet", "1") .get(); String index = response.getIndex(); String type = response.getType(); String id = response.getId(); long version = response.getVersion(); System.out.println(index + " : " + type + ": " + id + ": " + version); } @Test public void testUpdate() throws Exception { UpdateRequest updateRequest = new UpdateRequest(); updateRequest.index("twitter"); updateRequest.type("tweet"); updateRequest.id("1"); updateRequest.doc(XContentFactory.jsonBuilder() .startObject() // 对没有的字段添加, 对已有的字段替换 .field("gender", "male") .field("message", "hello") .endObject()); UpdateResponse response = client.update(updateRequest).get(); // 打印 String index = response.getIndex(); String type = response.getType(); String id = response.getId(); long version = response.getVersion(); System.out.println(index + " : " + type + ": " + id + ": " + version); } @Test public void testUpdate2() throws Exception { // 使用Script对象进行更新// UpdateResponse response = client.prepareUpdate("twitter", "tweet", "1")// .setScript(new Script("hits._source.gender = \"male\""))// .get(); // 使用XContFactory.jsonBuilder() 进行更新// UpdateResponse response = client.prepareUpdate("twitter", "tweet", "1")// .setDoc(XContentFactory.jsonBuilder()// .startObject()// .field("gender", "malelelele")// .endObject()).get(); // 使用updateRequest对象及script// UpdateRequest updateRequest = new UpdateRequest("twitter", "tweet", "1")// .script(new Script("ctx._source.gender=\"male\""));// UpdateResponse response = client.update(updateRequest).get(); // 使用updateRequest对象及documents进行更新 UpdateResponse response = client.update(new UpdateRequest("twitter", "tweet", "1") .doc(XContentFactory.jsonBuilder() .startObject() .field("gender", "male") .endObject() )).get(); System.out.println(response.getIndex()); } @Test public void testUpdate3() throws InterruptedException, Exception { UpdateRequest updateRequest = new UpdateRequest("twitter", "tweet", "1") .script(new Script("ctx._source.gender=\"male\"")); UpdateResponse response = client.update(updateRequest).get(); } @Test public void testUpsert() throws Exception { // 设置查询条件, 查找不到则添加生效 IndexRequest indexRequest = new IndexRequest("twitter", "tweet", "2") .source(XContentFactory.jsonBuilder() .startObject() .field("name", "214") .field("gender", "gfrerq") .endObject()); // 设置更新, 查找到更新下面的设置 UpdateRequest upsert = new UpdateRequest("twitter", "tweet", "2") .doc(XContentFactory.jsonBuilder() .startObject() .field("user", "wenbronk") .endObject()) .upsert(indexRequest); client.update(upsert).get(); } @Test public void testMultiGet() { MultiGetResponse multiGetResponse = client.prepareMultiGet() .add("twitter", "tweet", "1") .add("twitter", "tweet", "2", "3", "4") .add("anothoer", "type", "foo") .get(); for (MultiGetItemResponse itemResponse : multiGetResponse) { GetResponse response = itemResponse.getResponse(); if (response.isExists()) { String sourceAsString = response.getSourceAsString(); System.out.println(sourceAsString); } } } @Test public void testBulk() throws Exception { BulkRequestBuilder bulkRequest = client.prepareBulk(); bulkRequest.add(client.prepareIndex("twitter", "tweet", "1") .setSource(XContentFactory.jsonBuilder() .startObject() .field("user", "kimchy") .field("postDate", new Date()) .field("message", "trying out Elasticsearch") .endObject())); bulkRequest.add(client.prepareIndex("twitter", "tweet", "2") .setSource(XContentFactory.jsonBuilder() .startObject() .field("user", "kimchy") .field("postDate", new Date()) .field("message", "another post") .endObject())); BulkResponse response = bulkRequest.get(); System.out.println(response.getHeaders()); } @Test public void testBulkProcessor() throws Exception { // 创建BulkPorcessor对象 BulkProcessor bulkProcessor = BulkProcessor.builder(client, new Listener() { public void beforeBulk(long paramLong, BulkRequest paramBulkRequest) { // TODO Auto-generated method stub } // 执行出错时执行 public void afterBulk(long paramLong, BulkRequest paramBulkRequest, Throwable paramThrowable) { // TODO Auto-generated method stub } public void afterBulk(long paramLong, BulkRequest paramBulkRequest, BulkResponse paramBulkResponse) { // TODO Auto-generated method stub } }) // 1w次请求执行一次bulk .setBulkActions(10000) // 1gb的数据刷新一次bulk .setBulkSize(new ByteSizeValue(1, ByteSizeUnit.GB)) // 固定5s必须刷新一次 .setFlushInterval(TimeValue.timeValueSeconds(5)) // 并发请求数量, 0不并发, 1并发允许执行 .setConcurrentRequests(1) // 设置退避, 100ms后执行, 最大请求3次 .setBackoffPolicy( BackoffPolicy.exponentialBackoff(TimeValue.timeValueMillis(100), 3)) .build(); // 添加单次请求 bulkProcessor.add(new IndexRequest("twitter", "tweet", "1")); bulkProcessor.add(new DeleteRequest("twitter", "tweet", "2")); // 关闭 bulkProcessor.awaitClose(10, TimeUnit.MINUTES); // 或者 bulkProcessor.close(); }}tes2代码:
package com.wenbronk.javaes;import java.net.InetSocketAddress;import org.apache.lucene.queryparser.xml.FilterBuilderFactory;import org.elasticsearch.action.search.MultiSearchResponse;import org.elasticsearch.action.search.SearchRequestBuilder;import org.elasticsearch.action.search.SearchResponse;import org.elasticsearch.action.search.SearchType;import org.elasticsearch.client.transport.TransportClient;import org.elasticsearch.common.settings.Settings;import org.elasticsearch.common.settings.Settings.Builder;import org.elasticsearch.common.transport.InetSocketTransportAddress;import org.elasticsearch.common.unit.TimeValue;import org.elasticsearch.index.query.QueryBuilder;import org.elasticsearch.index.query.QueryBuilders;import org.elasticsearch.search.SearchHit;import org.elasticsearch.search.aggregations.Aggregation;import org.elasticsearch.search.aggregations.AggregationBuilders;import org.elasticsearch.search.aggregations.bucket.histogram.DateHistogramInterval;import org.elasticsearch.search.sort.SortOrder;import org.elasticsearch.search.sort.SortParseElement;import org.junit.Before;import org.junit.Test;public class JavaESTest2 { private TransportClient client; @Before public void testBefore() { Builder builder = Settings.settingsBuilder(); builder.put("cluster.name", "wenbronk_escluster");// .put("client.transport.ignore_cluster_name", true); Settings settings = builder.build(); org.elasticsearch.client.transport.TransportClient.Builder transportBuild = TransportClient.builder(); TransportClient client1 = transportBuild.settings(settings).build(); client = client1.addTransportAddress((new InetSocketTransportAddress(new InetSocketAddress("192.168.50.37", 9300)))); System.out.println("success connect to escluster"); } @Test public void testSearch() {// SearchRequestBuilder searchRequestBuilder = client.prepareSearch("twitter", "tweet", "1");// SearchResponse response = searchRequestBuilder.setTypes("type1", "type2")// .setSearchType(SearchType.DFS_QUERY_THEN_FETCH)// .setQuery(QueryBuilders.termQuery("user", "test"))// .setPostFilter(QueryBuilders.rangeQuery("age").from(0).to(1))// .setFrom(0).setSize(2).setExplain(true)// .execute().actionGet(); SearchResponse response = client.prepareSearch() .execute().actionGet();// SearchHits hits = response.getHits();// for (SearchHit searchHit : hits) {// for(Iterator<SearchHitField> iterator = searchHit.iterator(); iterator.hasNext(); ) {// SearchHitField next = iterator.next();// System.out.println(next.getValues());// }// } System.out.println(response); } @Test public void testScrolls() { QueryBuilder queryBuilder = QueryBuilders.termQuery("twitter", "tweet"); SearchResponse response = client.prepareSearch("twitter") .addSort(SortParseElement.DOC_FIELD_NAME, SortOrder.ASC) .setScroll(new TimeValue(60000)) .setQuery(queryBuilder) .setSize(100).execute().actionGet(); while(true) { for (SearchHit hit : response.getHits().getHits()) { System.out.println("i am coming"); } SearchResponse response2 = client.prepareSearchScroll(response.getScrollId()) .setScroll(new TimeValue(60000)).execute().actionGet(); if (response2.getHits().getHits().length == 0) { System.out.println("oh no====="); break; } } } @Test public void testMultiSearch() { QueryBuilder qb1 = QueryBuilders.queryStringQuery("elasticsearch"); SearchRequestBuilder requestBuilder1 = client.prepareSearch().setQuery(qb1).setSize(1); QueryBuilder qb2 = QueryBuilders.matchQuery("user", "kimchy"); SearchRequestBuilder requestBuilder2 = client.prepareSearch().setQuery(qb2).setSize(1); MultiSearchResponse multiResponse = client.prepareMultiSearch().add(requestBuilder1).add(requestBuilder2) .execute().actionGet(); long nbHits = 0; for (MultiSearchResponse.Item item : multiResponse.getResponses()) { SearchResponse response = item.getResponse(); nbHits = response.getHits().getTotalHits(); SearchHit[] hits = response.getHits().getHits(); System.out.println(nbHits); } } @Test public void testAggregation() { SearchResponse response = client.prepareSearch() .setQuery(QueryBuilders.matchAllQuery()) // 先使用query过滤掉一部分 .addAggregation(AggregationBuilders.terms("term").field("user")) .addAggregation(AggregationBuilders.dateHistogram("agg2").field("birth") .interval(DateHistogramInterval.YEAR)) .execute().actionGet(); Aggregation aggregation2 = response.getAggregations().get("term"); Aggregation aggregation = response.getAggregations().get("agg2");// SearchResponse response2 = client.search(new SearchRequest().searchType(SearchType.QUERY_AND_FETCH)).actionGet(); } @Test public void testTerminateAfter() { SearchResponse response = client.prepareSearch("twitter").setTerminateAfter(1000).get(); if (response.isTerminatedEarly()) { System.out.println("ternimate"); } } @Test public void testFilter() { SearchResponse response = client.prepareSearch("twitter") .setTypes("") .setQuery(QueryBuilders.matchAllQuery()) //查询所有 .setSearchType(SearchType.QUERY_THEN_FETCH) // .setPostFilter(FilterBuilders.rangeFilter("age").from(0).to(19) // .includeLower(true).includeUpper(true)) // .setPostFilter(FilterBuilderFactory .rangeFilter("age").gte(18).lte(22)) .setExplain(true) //explain为true表示根据数据相关度排序，和关键字匹配最高的排在前面 .get(); } @Test public void testGroupBy() { client.prepareSearch("twitter").setTypes("tweet") .setQuery(QueryBuilders.matchAllQuery()) .setSearchType(SearchType.QUERY_THEN_FETCH) .addAggregation(AggregationBuilders.terms("user") .field("user").size(0) // 根据user进行分组 // size(0) 也是10 ).get(); } }上述就是小编为大家分享的使用java怎么对elasticsearch进行操作了，如果刚好有类似的疑惑，不妨参照上述分析进行理解。如果想知道更多相关知识，欢迎关注编程网行业资讯频道。
