public class TestApp {
public static void main(String[] args) throws Exception {
Settings settings = Settings.builder()
.put("cluster.name", "elasticsearch")
.build();
TransportClient client = new PreBuiltTransportClient(settings)
.addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("localhost"), 9300));
// prepreData(client);
executeSearch(client);
client.close();
}
private static void prepreData(TransportClient client) throws Exception{
client.prepareIndex("ball", "player", "1")
.setSource(XContentFactory.jsonBuilder()
.startObject()
.field("name", "james")
.field("age", 33)
.field("salary", 3000)
.field("team", "cav")
.field("position", "sf")
.endObject())
.get();
client.prepareIndex("ball", "player", "2")
.setSource(XContentFactory.jsonBuilder()
.startObject()
.field("name", "irving")
.field("age", 25)
.field("salary", 2000)
.field("team", "cav")
.field("position", "pg")
.endObject())
.get();
client.prepareIndex("ball", "player", "3")
.setSource(XContentFactory.jsonBuilder()
.startObject()
.field("name", "curry")
.field("age", 29)
.field("salary", 1000)
.field("team", "war")
.field("position", "pg")
.endObject())
.get();
client.prepareIndex("ball", "player", "4")
.setSource(XContentFactory.jsonBuilder()
.startObject()
.field("name", "thompson")
.field("age", 26)
.field("salary", 2000)
.field("team", "war")
.field("position", "sg")
.endObject())
.get();
client.prepareIndex("ball", "player", "5")
.setSource(XContentFactory.jsonBuilder()
.startObject()
.field("name", "green")
.field("age", 26)
.field("salary", 2000)
.field("team", "war")
.field("position", "pf")
.endObject())
.get();
client.prepareIndex("ball", "player", "6")
.setSource(XContentFactory.jsonBuilder()
.startObject()
.field("name", "garnett")
.field("age", 40)
.field("salary", 1000)
.field("team", "tim")
.field("position", "pf")
.endObject())
.get();
client.prepareIndex("ball", "player", "7")
.setSource(XContentFactory.jsonBuilder()
.startObject()
.field("name", "towns")
.field("age", 21)
.field("salary", 500)
.field("team", "tim")
.field("position", "c")
.endObject())
.get();
client.prepareIndex("ball", "player", "8")
.setSource(XContentFactory.jsonBuilder()
.startObject()
.field("name", "lavin")
.field("age", 21)
.field("salary", 300)
.field("team", "tim")
.field("position", "sg")
.endObject())
.get();
client.prepareIndex("ball", "player", "9")
.setSource(XContentFactory.jsonBuilder()
.startObject()
.field("name", "wigins")
.field("age", 20)
.field("salary", 500)
.field("team", "tim")
.field("position", "sf")
.endObject())
.get();
}
// private static void executeSearch(TransportClient client) {
// SearchResponse response = client.prepareSearch("ball")
// .setTypes("player")
// .setQuery(QueryBuilders.matchQuery("position", "sf"))
// .setPostFilter(QueryBuilders.rangeQuery("age").from(20).to(40))
// .setFrom(0).setSize(1)
// .get();
//
// SearchHit[] searchHits = response.getHits().getHits();
// for(int i = 0; i < searchHits.length; i++) {
// System.out.println(searchHits[i].getSourceAsString());
// }
// }
private static void executeSearch(TransportClient client) {
//demo1(client);
//demo2(client);
//demo3(client);
demo4(client);
}
private static void demo1(TransportClient client) {
// 例如要计算每个球队的球员数，如果使用SQL语句，应表达如下：
// select team, count(*) as player_count from player group by team;
BoolQueryBuilder queryBuilder = QueryBuilders.boolQuery();
// queryBuilder.filter(QueryBuilders.rangeQuery("age").from(25).to(30)); where age > 25 and age < 30
SearchRequestBuilder requestBuilder = client.prepareSearch("ball").setTypes("player").setQuery(queryBuilder).setFrom(0).setSize(10000);
requestBuilder.addAggregation(AggregationBuilders.terms("team").field("team"));
try{
SearchResponse response = requestBuilder.execute().get();
Aggregations aggregations = response.getAggregations();
StringTerms buckets = aggregations.get("team");
for (StringTerms.Bucket bucket : buckets.getBuckets()) {
System.out.println(bucket.getKeyAsString() + " : " + bucket.getDocCount());
}
}catch (Exception e){
// log.error ..
System.err.print(e);
}
}
private static void demo2(TransportClient client) {
// 例如要计算每个球队每个位置的球员数，如果使用SQL语句，应表达如下：
// select team, position, count(*) as pos_count from player group by team, position;
BoolQueryBuilder queryBuilder = QueryBuilders.boolQuery();
SearchRequestBuilder requestBuilder = client.prepareSearch("ball").setTypes("player").setQuery(queryBuilder).setFrom(0).setSize(10000);
//指定别名和分组的字段
TermsAggregationBuilder aggregator = AggregationBuilders.terms("team").field("team");
TermsAggregationBuilder aggregator2 = AggregationBuilders.terms("position").field("position");
//添加两个聚合构建器
requestBuilder.addAggregation(aggregator.subAggregation(aggregator2));
try{
//执行查询
SearchResponse response = requestBuilder.execute().actionGet();
//将查询结果放入map中
Map<String, Aggregation> aggMap = response.getAggregations().getAsMap();
//根据属性名到map中查找
StringTerms buckets = (StringTerms) aggMap.get("team");
for (StringTerms.Bucket bucket : buckets.getBuckets()) {
//先按球队进行分组
String team = (String) bucket.getKey();
Map<String, Aggregation> subAggMap = bucket.getAggregations().getAsMap();
StringTerms positions = (StringTerms) subAggMap.get("position");
//因为一个球队有很多位置，那么还要依次拿出位置信息
for (StringTerms.Bucket posBucket : positions.getBuckets()) {
//拿到位置的名字
String pos = (String) posBucket.getKey();
//拿出该位置的数量
long docCount = posBucket.getDocCount();
//打印球队，位置，人数
System.out.println(team + " " + pos + " " + docCount);
}
}
}catch (Exception e){
// log.error ..
System.err.print(e);
}
}
private static void demo3(TransportClient client) {
// 例如要计算每个球队年龄最大/最小/总/平均的球员年龄，如果使用SQL语句，应表达如下：
// select team, max(age) as max_age from player group by team;
BoolQueryBuilder queryBuilder = QueryBuilders.boolQuery();
SearchRequestBuilder requestBuilder = client.prepareSearch("ball").setTypes("player").setQuery(queryBuilder).setFrom(0).setSize(10000);
AggregationBuilder aggregator = AggregationBuilders.terms("team").field("team");
MaxAggregationBuilder ageAgg = AggregationBuilders.max("max_age").field("age");
requestBuilder.addAggregation(aggregator.subAggregation(ageAgg));
try{
SearchResponse response = requestBuilder.execute().actionGet();
Map<String, Aggregation> aggMap = response.getAggregations().getAsMap();
StringTerms buckets = (StringTerms) aggMap.get("team");
for (StringTerms.Bucket bucket : buckets.getBuckets()) {
//先按球队进行分组
String team = (String) bucket.getKey();
Map<String, Aggregation> subAggMap = bucket.getAggregations().getAsMap();
InternalMax ages = (InternalMax)subAggMap.get("max_age");
System.out.println(team + " " + ages.getValue());
}
}catch (Exception e){
// log.error ..
System.err.print(e);
}
}
private static void demo4(TransportClient client){
//聚合后对Aggregation结果排序
//例如要计算每个球队总年薪，并按照总年薪倒序排列，如果使用SQL语句，应表达如下：
//select team, sum(salary) as total_salary from player group by team order by total_salary desc;
BoolQueryBuilder queryBuilder = QueryBuilders.boolQuery();
SearchRequestBuilder requestBuilder = client.prepareSearch("ball").setTypes("player").setFrom(0).setSize(10000).setQuery(queryBuilder);
AggregationBuilder aggregation1 = AggregationBuilders.terms("team").field("team").order(Terms.Order.aggregation("total_salary", false));
SumAggregationBuilder aggregation2 = AggregationBuilders.sum("total_salary").field("salary");
requestBuilder.addAggregation(aggregation1.subAggregation(aggregation2));
try {
SearchResponse response = requestBuilder.execute().actionGet();
Map<String, Aggregation> aggMap = response.getAggregations().getAsMap();
StringTerms terms = (StringTerms) aggMap.get("team");
for (StringTerms.Bucket term : terms.getBuckets()){
String team = (String) term.getKey();
Map<String, Aggregation> subAggMap = term.getAggregations().getAsMap();
InternalSum sumSalary = (InternalSum) subAggMap.get("total_salary");
System.out.println(team + " " + sumSalary.getValue());
}
}catch (Exception e){
System.err.println(e);
}
}
}
版权声明：本文为sz457763638原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接和本声明。