Elasticsearch5.3 JAVA Demo 聚合查询
直接上代码：小弟写的不是特别清晰！也不是特别的完整！希望大神们不要介意！谢谢！
package com.vdyoo.paas.answerservice.search.es.esquery; import org.elasticsearch.action.search.SearchRequestBuilder; import org.elasticsearch.client.transport.TransportClient; import org.elasticsearch.common.settings.Settings; import org.elasticsearch.common.transport.InetSocketTransportAddress; import org.elasticsearch.transport.client.PreBuiltTransportClient; import org.junit.After; import org.junit.Before; import org.junit.Test; import java.net.InetAddress; import java.net.UnknownHostException; /** * Created by 启才 on 2017/6/20. */ public class EsQuery { //各种各样的查询‘ TransportClient client; @Before public void setup() throws UnknownHostException { System.out.println("create TransportClient..."); client = new PreBuiltTransportClient(Settings.EMPTY) .addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName(""), 9300)); } @After public void clearup() { System.out.println("close TransportClient..."); if (client != null) { client.close(); } } @Test public void doQuery(){ //匹配所有的查询 (条件) // QueryBuilder qb = matchAllQuery(); // System.out.println(qb); /* QueryBuilder qb = termQuery( "city", "Crumpler" ); System.out.println(qb);*/ //********************************************************************************** //根据ID查询一条数据 /** + * 根据ID查询一条数据记录。 + * @param id 要查询数据的ID。 + * @return 返回查询出来的记录对象的json字符串。 + */ // String index="classsstudentexam"; // String type="answer"; // String id="120"; // GetResponse getResponse = client // .prepareGet() // 准备进行get操作，此时还有真正地执行get操作。（与直接get的区别） // .setIndex(index) // 要查询的 // .setType(type) // .setId(id) // .get(); // System.out.println(getResponse); //********************************************************************************************************* //要注意的是下面的例子可以跨索引跨类型进行查询 //俩个查询条件 //允许多个条件 /* SearchResponse response = client.prepareSearch("store") .setTypes("book") .setSearchType(SearchType.DFS_QUERY_THEN_FETCH) //.setQuery(QueryBuilders.termQuery("author", "Kathy Sierra")) //字段和值 // Query .setPostFilter(QueryBuilders.rangeQuery("price").from(50).to(100)) // Filter .setFrom(0).setSize(60).setExplain(true) .get(); System.out.println(response);*/ // { // "took": 9, // "timed_out": false, // "_shards": { // "total": 5, // "successful": 5, // "failed": 0 // }, // "hits": { // "total": 2, // "max_score": 1, // "hits": [ // { // "_shard": "[store][1]", // "_node": "qTaK0CmRQ3iY4j8MOLWcXA", // "_index": "store", // "_type": "book", // "_id": "12", // "_score": 1, // "_source": { // "title": "Head First Java", // "origin": "英国", // "description": "java入门教材", // "author": "Kathy Sierra", // "price": 54 // }, // "_explanation": { // "value": 1, // "description": "ConstantScore(*:*), product of:", // "details": [ // { // "value": 1, // "description": "boost", // "details": [] // }, // { // "value": 1, // "description": "queryNorm", // "details": [] // } // ] // } // }, // { // "_shard": "[store][1]", // "_node": "qTaK0CmRQ3iY4j8MOLWcXA", // "_index": "store", // "_type": "book", // "_id": "21", // "_score": 1, // "_source": { // "title": "Design Pattern", // "origin": "法国", // "description": "程序员不得不读的设计模式", // "author": "Kathy Sierra", // "price": 89 // }, // "_explanation": { // "value": 1, // "description": "ConstantScore(*:*), product of:", // "details": [ // { // "value": 1, // "description": "boost", // "details": [] // }, // { // "value": 1, // "description": "queryNorm", // "details": [] // } // ] // } // } // ] // } // } //聚合查询 //************************************************************************************************************ //聚合查询 //初始化Builder //初始化Builder SearchRequestBuilder searchRequestBuilder = client.prepareSearch("vdyoo").setTypes("desktop"); //所要group by的字段 加上聚合 //select Examnum, count(*) as Examnum_count from studentexamtest group by Examnum; /* TermsAggregationBuilder field = AggregationBuilders.terms("CourseClass_count").field("orgkey"); searchRequestBuilder.addAggregation(field); SearchResponse searchResponse = searchRequestBuilder.execute().actionGet(); System.out.println(searchResponse);*/ //{"took":16,"timed_out":false,"_shards":{"total":5,"successful":5,"failed":0},"hits":{"total":7174,"max_score":1.0,"hits":[{"_index":"classssstudentexamtest","_type":"answer","_id":"253","_score":1.0,"_source":{"Updatetime":1493374495149,"Student":2634,"Classs":101,"Answer":"D","Score":0,"CourseplanId":"CUP20170427025735619nixjd","CourseClass":35,"Createtime":1493374495149,"Examnum":28,"id":253,"Ok":0,"Room":101,"CourseClassExam":113}},{"_index":"classssstudentexamtest","_type":"answer","_id":"254","_score":1.0,"_source":{"Updatetime":1493374653157,"Student":2630,"Classs":101,"Answer":"B","Score":0,"CourseplanId":"CUP20170427025735619nixjd","CourseClass":35,"Createtime":1493374653157,"Examnum":28,"id":254,"Ok":0,"Room":101,"CourseClassExam":113}},{"_index":"classssstudentexamtest","_type":"answer","_id":"256","_score":1.0,"_source":{"Updatetime":1493721800274,"Student":5200,"Classs":227,"Answer":"A","Score":5,"CourseplanId":"CUP20170502040118596ldang","CourseClass":109,"Createtime":1493721800274,"Examnum":2,"id":256,"Ok":1,"Room":239,"CourseClassExam":121}},{"_index":"classssstudentexamtest","_type":"answer","_id":"259","_score":1.0,"_source":{"Updatetime":1493722363517,"Student":5200,"Classs":227,"Answer":"A","Score":5,"CourseplanId":"CUP20170502040118596ldang","CourseClass":109,"Createtime":1493722363517,"Examnum":6,"id":259,"Ok":1,"Room":239,"CourseClassExam":125}},{"_index":"classssstudentexamtest","_type":"answer","_id":"260","_score":1.0,"_source":{"Updatetime":1493722386247,"Student":5200,"Classs":227,"Answer":"0","Score":5,"CourseplanId":"CUP20170502040118596ldang","CourseClass":109,"Createtime":1493722386247,"Examnum":7,"id":260,"Ok":1,"Room":239,"CourseClassExam":126}},{"_index":"classssstudentexamtest","_type":"answer","_id":"264","_score":1.0,"_source":{"Updatetime":1493805813556,"Student":5199,"Classs":227,"Answer":"1","Score":5,"CourseplanId":"CUP20170503060043676boale","CourseClass":109,"Createtime":1493805813556,"Examnum":2,"id":264,"Ok":1,"Room":239,"CourseClassExam":130}},{"_index":"classssstudentexamtest","_type":"answer","_id":"265","_score":1.0,"_source":{"Updatetime":1493805922316,"Student":5199,"Classs":227,"Answer":"0","Score":5,"CourseplanId":"CUP20170503060043676boale","CourseClass":109,"Createtime":1493805922316,"Examnum":3,"id":265,"Ok":1,"Room":239,"CourseClassExam":131}},{"_index":"classssstudentexamtest","_type":"answer","_id":"270","_score":1.0,"_source":{"Updatetime":1493807772746,"Student":5200,"Classs":227,"Answer":"0","Score":5,"CourseplanId":"CUP20170503060043676boale","CourseClass":109,"Createtime":1493807772746,"Examnum":9,"id":270,"Ok":1,"Room":239,"CourseClassExam":137}},{"_index":"classssstudentexamtest","_type":"answer","_id":"108","_score":1.0,"_source":{"Updatetime":1493214489825,"Student":2574,"Classs":100,"Answer":"D","Score":0,"CourseplanId":"CUP20170423020722752xqkol","CourseClass":31,"Createtime":1493214489825,"Examnum":14,"id":108,"Ok":0,"Room":100,"CourseClassExam":58}},{"_index":"classssstudentexamtest","_type":"answer","_id":"110","_score":1.0,"_source":{"Updatetime":1493214495486,"Student":2578,"Classs":100,"Answer":"B","Score":0,"CourseplanId":"CUP20170423020722752xqkol","CourseClass":31,"Createtime":1493214495486,"Examnum":14,"id":110,"Ok":0,"Room":100,"CourseClassExam":58}}]},"aggregations":{"classssstudentexamtest_count":{"doc_count_error_upper_bound":0,"sum_other_doc_count":0,"buckets":[{"key":"CUP20170603100856501tgjws","doc_count":765},{"key":"CUP20170519090117735ugmzw","doc_count":531},{"key":"CUP20170603120737619gfxsa","doc_count":312},{"key":"CUP20170516083240398evrik","doc_count":308},{"key":"CUP20170618082126408psszj","doc_count":291},{"key":"CUP20170612095749865ljusl","doc_count":254},{"key":"CUP20170510064759160qckgw","doc_count":244},{"key":"CUP20170505101018686pbrkj","doc_count":219},{"key":"CUP20170628061714049iqzvj","doc_count":214},{"key":"CUP20170619030802390hynnv","doc_count":187},{"key":"CUP20170630113637873lbgtd","doc_count":178},{"key":"CUP20170627062050796qtpxj","doc_count":174},{"key":"CUP20170618045038072qvuvu","doc_count":165},{"key":"CUP20170602013009158szyqm","doc_count":130},{"key":"CUP20170522031911505okfvr","doc_count":125},{"key":"CUP20170613071602678cmgfj","doc_count":124},{"key":"CUP20170627062050800ybegt","doc_count":122},{"key":"CUP20170512094236918zkimg","doc_count":120},{"key":"CUP20170618062945995lahuf","doc_count":118},{"key":"CUP20170609110408973ocnkv","doc_count":113},{"key":"CUP20170515041217245ybplo","doc_count":110},{"key":"CUP20170517105057782okfkc","doc_count":99},{"key":"CUP20170619120325390ssyuk","doc_count":89},{"key":"CUP20170608125228438dibwg","doc_count":80},{"key":"CUP20170606105546790zbvji","doc_count":78},{"key":"CUP20170427025735619nixjd","doc_count":77},{"key":"CUP20170423020722752xqkol","doc_count":76},{"key":"CUP20170524013221969zswck","doc_count":76},{"key":"CUP20170509031004381zdxnq","doc_count":70},{"key":"CUP20170511074722091ctntn","doc_count":70},{"key":"CUP20170607015250657xddtk","doc_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//group by多个field //select CourseplanId,CourseClass count(*) as class_count from group by CourseplanId,CourseClass; //这个教室里面A有多少人B有多少人。。。。 /* TermsAggregationBuilder CourseplanIdAgg = AggregationBuilders.terms("Room_count").field("Room"); TermsAggregationBuilder CourseClassAgg = AggregationBuilders.terms("CourseClass_count").field("Answer"); searchRequestBuilder.addAggregation(CourseplanIdAgg.subAggregation(CourseClassAgg)); SearchResponse searchResponse1 = searchRequestBuilder.execute().actionGet(); System.out.println(searchResponse1);*/ //结果{"took":18,"timed_out":false,"_shards":{"total":5,"successful":5,"failed":0},"hits":{"total":7174,"max_score":1.0,"hits":[{"_index":"classssstudentexamtest","_type":"answer","_id":"24","_score":1.0,"_source":{"Updatetime":1492930865258,"Student":2701,"Classs":102,"Answer":"A","Score":1,"CourseplanId":"CUP20170423020722210lpxsw","CourseClass":31,"Createtime":1492930865258,"Examnum":4,"id":24,"Ok":1,"Room":102,"CourseClassExam":27}},{"_index":"classssstudentexamtest","_type":"answer","_id":"25","_score":1.0,"_source":{"Updatetime":1492930865877,"Student":2704,"Classs":102,"Answer":"A","Score":1,"CourseplanId":"CUP20170423020722210lpxsw","CourseClass":31,"Createtime":1492930865877,"Examnum":4,"id":25,"Ok":1,"Room":102,"CourseClassExam":27}},{"_index":"classssstudentexamtest","_type":"answer","_id":"26","_score":1.0,"_source":{"Updatetime":1492930867462,"Student":2698,"Classs":102,"Answer":"A","Score":1,"CourseplanId":"CUP20170423020722210lpxsw","CourseClass":31,"Createtime":1492930867462,"Examnum":4,"id":26,"Ok":1,"Room":102,"CourseClassExam":27}},{"_index":"classssstudentexamtest","_type":"answer","_id":"29","_score":1.0,"_source":{"Updatetime":1492930874709,"Student":2635,"Classs":101,"Answer":"B","Score":0,"CourseplanId":"CUP20170423020722210lpxsw","CourseClass":31,"Createtime":1492930874710,"Examnum":4,"id":29,"Ok":0,"Room":101,"CourseClassExam":27}},{"_index":"classssstudentexamtest","_type":"answer","_id":"40","_score":1.0,"_source":{"Updatetime":1492934512558,"Student":2582,"Classs":100,"Answer":"55","Score":5,"CourseplanId":"CUP20170423020722210lpxsw","CourseClass":31,"Createtime":1492934512558,"Examnum":8,"id":40,"Ok":1,"Room":100,"CourseClassExam":30}},{"_index":"classssstudentexamtest","_type":"answer","_id":"41","_score":1.0,"_source":{"Updatetime":1492934523940,"Student":5192,"Classs":99,"Answer":"66","Score":0,"CourseplanId":"CUP20170423020722210lpxsw","CourseClass":31,"Createtime":1492934523940,"Examnum":8,"id":41,"Ok":0,"Room":99,"CourseClassExam":30}},{"_index":"classssstudentexamtest","_type":"answer","_id":"44","_score":1.0,"_source":{"Updatetime":1492934535161,"Student":5190,"Classs":100,"Answer":"33","Score":0,"CourseplanId":"CUP20170423020722210lpxsw","CourseClass":31,"Createtime":1492934535161,"Examnum":8,"id":44,"Ok":0,"Room":100,"CourseClassExam":30}},{"_index":"classssstudentexamtest","_type":"answer","_id":"48","_score":1.0,"_source":{"Updatetime":1492934678950,"Student":2632,"Classs":101,"Answer":"12","Score":0,"CourseplanId":"CUP20170423020722210lpxsw","CourseClass":31,"Createtime":1492934678950,"Examnum":8,"id":48,"Ok":0,"Room":101,"CourseClassExam":30}},{"_index":"classssstudentexamtest","_type":"answer","_id":"52","_score":1.0,"_source":{"Updatetime":1492934832480,"Student":2638,"Classs":101,"Answer":"12","Score":0,"CourseplanId":"CUP20170423020722210lpxsw","CourseClass":31,"Createtime":1492934832480,"Examnum":8,"id":52,"Ok":0,"Room":101,"CourseClassExam":30}},{"_index":"classssstudentexamtest","_type":"answer","_id":"253","_score":1.0,"_source":{"Updatetime":1493374495149,"Student":2634,"Classs":101,"Answer":"D","Score":0,"CourseplanId":"CUP20170427025735619nixjd","CourseClass":35,"Createtime":1493374495149,"Examnum":28,"id":253,"Ok":0,"Room":101,"CourseClassExam":113}}]},"aggregations":{"CourseplanId_count":{"doc_count_error_upper_bound":89,"sum_other_doc_count":3849,"buckets":[{"key":"CUP20170603100856501tgjws","doc_count":765,"CourseClass_count":{"doc_count_error_upper_bound":0,"sum_other_doc_count":0,"buckets":[{"key":124,"doc_count":765}]}},{"key":"CUP20170519090117735ugmzw","doc_count":531,"CourseClass_count":{"doc_count_error_upper_bound":0,"sum_other_doc_count":0,"buckets":[{"key":123,"doc_count":531}]}},{"key":"CUP20170603120737619gfxsa","doc_count":312,"CourseClass_count":{"doc_count_error_upper_bound":0,"sum_other_doc_count":0,"buckets":[{"key":124,"doc_count":312}]}},{"key":"CUP20170516083240398evrik","doc_count":308,"CourseClass_count":{"doc_count_error_upper_bound":0,"sum_other_doc_count":0,"buckets":[{"key":106,"doc_count":308}]}},{"key":"CUP20170618082126408psszj","doc_count":291,"CourseClass_count":{"doc_count_error_upper_bound":0,"sum_other_doc_count":0,"buckets":[{"key":31,"doc_count":291}]}},{"key":"CUP20170612095749865ljusl","doc_count":254,"CourseClass_count":{"doc_count_error_upper_bound":0,"sum_other_doc_count":0,"buckets":[{"key":30,"doc_count":254}]}},{"key":"CUP20170510064759160qckgw","doc_count":244,"CourseClass_count":{"doc_count_error_upper_bound":0,"sum_other_doc_count":0,"buckets":[{"key":118,"doc_count":244}]}},{"key":"CUP20170505101018686pbrkj","doc_count":219,"CourseClass_count":{"doc_count_error_upper_bound":0,"sum_other_doc_count":0,"buckets":[{"key":109,"doc_count":219}]}},{"key":"CUP20170628061714049iqzvj","doc_count":214,"CourseClass_count":{"doc_count_error_upper_bound":0,"sum_other_doc_count":0,"buckets":[{"key":8,"doc_count":214}]}},{"key":"CUP20170619030802390hynnv","doc_count":187,"CourseClass_count":{"doc_count_error_upper_bound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//************************************************************************************************************** //max/min/sum/avg //例如要计算每个教学计划最大/最小/总/平均的球员工资，如果使用SQL语句，应表达如下： //select age, max(salary) as max_salary from player group by age; //以age分组 分组中最大工资 /* TermsAggregationBuilder classAgg = AggregationBuilders.terms("CourseplanId_count").field("CourseplanId"); MaxAggregationBuilder maxAggregationBuilder = AggregationBuilders.max("max_salary").field("salary"); searchRequestBuilder.addAggregation(classAgg.subAggregation(maxAggregationBuilder)); SearchResponse searchResponse = searchRequestBuilder.execute().actionGet(); System.out.println(searchResponse);*/ //对多个field求max/min/sum/avg例如要计算每个球队球员的平均年龄，同时又要计算总年薪，如果使用SQL语句，应表达如下： //select team, avg(age)as avg_age, sum(salary) as total_salary from player group by team; /*TermsAggregationBuilder terms = AggregationBuilders.terms("team"); AvgAggregationBuilder field = AggregationBuilders.avg("avg_age").field("age"); AvgAggregationBuilder field1 = AggregationBuilders.avg("avg_salary").field("salary"); searchRequestBuilder.addAggregation(terms.subAggregation(field).subAggregation(field1)); SearchResponse searchResponse1 = searchRequestBuilder.execute().actionGet(); System.out.println(searchResponse1);*/ } // 定义索引的映射类型 //********************************************************************************************************* } 下面有mapping的截图