ElasticSearch Java整合
项目准备
Elasticsearch 软件是由 Java 语言开发的，所以也可以通过 Java API 的方式对 Elasticsearch 服务进行访问
项目配置
pom.xml
<dependencies>
<dependency>
<groupId>org.elasticsearch</groupId>
<artifactId>elasticsearch</artifactId>
<version>7.8.0</version>
</dependency>
<!-- elasticsearch 的客户端 -->
<dependency>
<groupId>org.elasticsearch.client</groupId>
<artifactId>elasticsearch-rest-high-level-client</artifactId>
<version>7.8.0</version>
</dependency>
<!-- elasticsearch 依赖 2.x 的 log4j -->
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api</artifactId>
<version>2.8.2</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>2.8.2</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.9.3</version>
</dependency>
<!-- junit 单元测试 -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
</dependencies>elasticsearch 的两个依赖要和 elasticsearch 服务器版本一致。
客户端对象
建好项目，创建一个类，测试连接 ES 服务器
public class ESTest_Client {
public static void main(String[] args) throws IOException {
//创建ES客户端
RestHighLevelClient esClient = new RestHighLevelClient(
RestClient.builder(new HttpHost("localhost",9200,"http"))
);
//关闭ES客户端
esClient.close();
}
}运行后控制台如果不报错，则代表连接成功。
注意：9200 端口为 Elasticsearch 的 Web 通信端口，localhost 为启动 ES 服务的主机名。
索引操作
ES 服务器正常启动后，可以通过 Java API 客户端对象对 ES 索引进行操作
创建索引
public class ESTest_Index_Create {
public static void main(String[] args) throws IOException {
//创建ES客户端
RestHighLevelClient esClient = new RestHighLevelClient(
RestClient.builder(new HttpHost("localhost",9200,"http"))
);
//创建索引
CreateIndexRequest request = new CreateIndexRequest("user");
CreateIndexResponse createIndexResponse =
esClient.indices().create(request, RequestOptions.DEFAULT);
//响应状态
boolean acknowledged = createIndexResponse.isAcknowledged();
System.out.println("创建索引状态: "+acknowledged);
esClient.close();
}
}- 结果
创建索引状态: true
Process finished with exit code 0查看索引
public class ESTest_Index_Search {
public static void main(String[] args) throws IOException {
//创建ES客户端
RestHighLevelClient esClient = new RestHighLevelClient(
RestClient.builder(new HttpHost("localhost",9200,"http"))
);
//查询索引
GetIndexRequest request = new GetIndexRequest("user");
GetIndexResponse getIndexResponse =
esClient.indices().get(request, RequestOptions.DEFAULT);
//响应状态
System.out.println(getIndexResponse.getAliases());
System.out.println(getIndexResponse.getMappings());
System.out.println(getIndexResponse.getSettings());
esClient.close();
}
}- 结果
{user=[]}
{user=org.elasticsearch.cluster.metadata.MappingMetadata@89984224}
{user={"index.creation_date":"1656599701456","index.number_of_replicas":"1","index.number_of_shards":"1","index.provided_name":"user","index.uuid":"So0-k5DJRIOBWMQ0DvtsyA","index.version.created":"7080099"}}
Process finished with exit code 0删除索引
public class ESTest_Index_Delete {
public static void main(String[] args) throws IOException {
//创建ES客户端
RestHighLevelClient esClient = new RestHighLevelClient(
RestClient.builder(new HttpHost("localhost",9200,"http"))
);
//查询索引
DeleteIndexRequest request = new DeleteIndexRequest("user");
AcknowledgedResponse response =
esClient.indices().delete(request, RequestOptions.DEFAULT);
//响应状态
System.out.println(response.isAcknowledged());
esClient.close();
}
}- 结果
true
Process finished with exit code 0总结
关于索引的请求，用到 xxxIndexRequest 以及 .indices().xxx，其中 xxx 代表增删查
文章操作
新增文档
首先需要创建一个实体类：User
public class User {
private String name;
private String sex;
private Integer age;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
}创建数据，添加到文档中
public class ESTest_Doc_Create {
public static void main(String[] args) throws IOException {
//创建ES客户端
RestHighLevelClient esClient = new RestHighLevelClient(
RestClient.builder(new HttpHost("localhost",9200,"http"))
);
//插入数据
IndexRequest request = new IndexRequest();
request.index("user").id("1001");
User user = new User();
user.setName("zhangsan");
user.setAge(20);
user.setSex("男");
//向ES插入数据，必须将数据转换为JSON格式
ObjectMapper mapper = new ObjectMapper();
String userJson = mapper.writeValueAsString(user);
request.source(userJson, XContentType.JSON);
IndexResponse response = esClient.index(request, RequestOptions.DEFAULT);
System.out.println(response.getResult());
esClient.close();
}
}- 结果
CREATED
Process finished with exit code 0修改文档
public class ESTest_Doc_Update {
public static void main(String[] args) throws IOException {
//创建ES客户端
RestHighLevelClient esClient = new RestHighLevelClient(
RestClient.builder(new HttpHost("localhost",9200,"http"))
);
//修改数据
UpdateRequest request = new UpdateRequest();
request.index("user").id("1001");
request.doc(XContentType.JSON,"sex","女");
UpdateResponse response = esClient.update(request, RequestOptions.DEFAULT);
System.out.println(response.getResult());
esClient.close();
}
}- 结果
UPDATED
Process finished with exit code 0查询文档
public class ESTest_Doc_Get {
public static void main(String[] args) throws IOException {
//创建ES客户端
RestHighLevelClient esClient = new RestHighLevelClient(
RestClient.builder(new HttpHost("localhost",9200,"http"))
);
//查询数据
GetRequest request = new GetRequest();
request.index("user").id("1001");
GetResponse response = esClient.get(request, RequestOptions.DEFAULT);
System.out.println(response.getSourceAsString());
esClient.close();
}
}- 结果
{"name":"zhangsan","sex":"女","age":20}
Process finished with exit code 0删除文档
public class ESTest_Doc_Delete {
public static void main(String[] args) throws IOException {
//创建ES客户端
RestHighLevelClient esClient = new RestHighLevelClient(
RestClient.builder(new HttpHost("localhost",9200,"http"))
);
//删除数据
DeleteRequest request = new DeleteRequest();
request.index("user").id("1001");
DeleteResponse response = esClient.delete(request, RequestOptions.DEFAULT);
System.out.println(response.toString());
esClient.close();
}
}- 结果
DeleteResponse[index=user,type=_doc,id=1001,version=6,result=deleted,shards=ShardInfo{total=2, successful=1, failures=[]}]
Process finished with exit code 0批量新增
:::: tabs cache-lifetime="5" :options="{ useUrlFragment: false }"
::: tab 非实体类批量新增
public class ESTest_Doc_Insert_Batch {
public static void main(String[] args) throws IOException {
//创建ES客户端
RestHighLevelClient esClient = new RestHighLevelClient(
RestClient.builder(new HttpHost("localhost",9200,"http"))
);
//批量插入数据
BulkRequest request = new BulkRequest();
request.add(new IndexRequest().index("user").id("1001").source(XContentType.JSON,"name","zhangsan"));
request.add(new IndexRequest().index("user").id("1002").source(XContentType.JSON,"name","lisi"));
request.add(new IndexRequest().index("user").id("1003").source(XContentType.JSON,"name","wangwu"));
request.add(new IndexRequest().index("user").id("1004").source(XContentType.JSON,"name","lucy"));
BulkResponse response = esClient.bulk(request, RequestOptions.DEFAULT);
System.out.println(response.getTook());
System.out.println(response.getItems());
esClient.close();
}
}:::
::: tab 实体类批量新增
public class EsDocCreateBatch {
public static void main(String[] args) throws IOException {
// 连接 ES 客户端
RestHighLevelClient esClient = new RestHighLevelClient(
RestClient.builder(new HttpHost("localhost",9200,"http")));
BulkRequest request = new BulkRequest();
// 创建数据对象
User user = new User("可乐","18","男");
request.add(new IndexRequest().index("user").id("1001").source(XContentType.JSON, "username","可乐","age",18,"sex","男"));
request.add(new IndexRequest().index("user").id("1002").source(XContentType.JSON, "username","冰糖","age",20,"sex","女"));
request.add(new IndexRequest().index("user").id("1003").source(XContentType.JSON, "username","雪梨","age",22,"sex","女"));
request.add(new IndexRequest().index("user").id("1004").source(XContentType.JSON, "username","酸橙","age",24,"sex","男"));
request.add(new IndexRequest().index("user").id("1005").source(XContentType.JSON, "username","蜜桃","age",26,"sex","女"));
// 客户端发送请求，获取响应对象
BulkResponse response = esClient.bulk(request, RequestOptions.DEFAULT);
System.out.println("响应时间：" + response.getTook());
System.out.println("创建的内容：" + Arrays.toString(response.getItems()));
// 关闭 ES 客户端
esClient.close();
}
}:::
:::::
- 结果
141ms
[Lorg.elasticsearch.action.bulk.BulkItemResponse;@152aa092
Process finished with exit code 0批量删除
public class ESTest_Doc_Delete_Batch {
public static void main(String[] args) throws IOException {
//创建ES客户端
RestHighLevelClient esClient = new RestHighLevelClient(
RestClient.builder(new HttpHost("localhost",9200,"http"))
);
//批量插入数据
BulkRequest request = new BulkRequest();
//配置修改参数
request.add(new DeleteRequest().index("user").id("1001"));
request.add(new DeleteRequest().index("user").id("1002"));
request.add(new DeleteRequest().index("user").id("1003"));
request.add(new DeleteRequest().index("user").id("1004"));
request.add(new DeleteRequest().index("user").id("1005"));
//客户端发送请求，获取响应对象
BulkResponse response = esClient.bulk(request, RequestOptions.DEFAULT);
//打印结果信息
System.out.println("响应时间："+response.getTook());
esClient.close();
}
} - 结果
响应时间：199ms
Process finished with exit code 0总结
增删改查操作格式：
- 连接 ES 客户端
- 创建一个
XXXRequest对象，其中 XXX 代表增删改查 - 给该对象设置索引和文档
- 调用
.XXX请求，传入参数，其中 XXX 代表增删改查
高级查询
查询准备
本内容都是查询相关，所以需要插入几条数据
public class EsDocCreateBatch {
public static void main(String[] args) throws IOException {
// 连接 ES 客户端
RestHighLevelClient esClient = new RestHighLevelClient(
RestClient.builder(new HttpHost("localhost",9200,"http")));
BulkRequest request = new BulkRequest();
ObjectMapper objectMapper = new ObjectMapper();
// 创建数据对象
request.add(new IndexRequest().index("user").id("1001").source(objectMapper.writeValueAsString(new User("可乐", 18, "男")), XContentType.JSON));
request.add(new IndexRequest().index("user").id("1002").source(objectMapper.writeValueAsString(new User("冰糖", 20, "女")), XContentType.JSON));
request.add(new IndexRequest().index("user").id("1003").source(objectMapper.writeValueAsString(new User("雪梨", 22, "女")), XContentType.JSON));
request.add(new IndexRequest().index("user").id("1004").source(objectMapper.writeValueAsString(new User("酸橙", 24, "男")), XContentType.JSON));
request.add(new IndexRequest().index("user").id("1005").source(objectMapper.writeValueAsString(new User("蜜桃", 30, "女")), XContentType.JSON));
// 客户端发送请求，获取响应对象
BulkResponse response = esClient.bulk(request, RequestOptions.DEFAULT);
System.out.println("响应时间：" + response.getTook());
// 关闭 ES 客户端
esClient.close();
}
}查询所有索引数据
public class ESTest_Doc_QueryAll {
public static void main(String[] args) throws IOException {
//创建ES客户端
RestHighLevelClient esClient = new RestHighLevelClient(
RestClient.builder(new HttpHost("localhost",9200,"http"))
);
//1.查询索引中全部的数据
SearchRequest request = new SearchRequest();
request.indices("user");
SearchSourceBuilder query = new SearchSourceBuilder().query(QueryBuilders.matchAllQuery());
request.source(query);
SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);
SearchHits hits = response.getHits();
System.out.println("总共的查询条数:"+hits.getTotalHits());
System.out.println("查询时间:"+response.getTook());
System.out.println("详细数据；");
for (SearchHit hit : hits) {
// 输出每条查询的结果信息
System.out.println(hit.getSourceAsString());
}
esClient.close();
}
}indices(参数) 的参数可以是多个索引。
- 结果
总共的查询条数:5 hits
查询时间:136ms
详细数据；
{"name":"可乐","sex":"男","age":18}
{"name":"冰糖","sex":"女","age":20}
{"name":"雪梨","sex":"女","age":22}
{"name":"酸橙","sex":"男","age":24}
{"name":"蜜桃","sex":"女","age":30}
Process finished with exit code 0条件查询-term
public class ESTermQuery {
public static void main(String[] args) throws IOException {
//连接ES客户端
RestHighLevelClient esClient =
new RestHighLevelClient(RestClient.builder(new HttpHost("localhost", 9200, "http")));
SearchRequest request = new SearchRequest();
request.indices("user");
//构建查询的请求体
SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
sourceBuilder.query(QueryBuilders.termQuery("age","18"));
SearchResponse response = esClient.search(request.source(sourceBuilder), RequestOptions.DEFAULT);
//查询匹配
SearchHits hits = response.getHits();
System.out.println("响应时间:"+response.getTook());
System.out.println("是否超时:"+response.isTimedOut());
System.out.println("命中数量:"+hits.getTotalHits());
System.out.println("MaxScore:"+hits.getMaxScore());
System.out.println("详细数据:");
for (SearchHit hit : hits) {
//输出每条查询的结果信息
System.out.println(hit.getSourceAsString());
}
//关闭ES客户端
esClient.close();
}
}- 结果
响应时间:140ms
是否超时:false
命中数量:1 hits
MaxScore:1.0
详细数据:
{"name":"可乐","sex":"男","age":18}
Process finished with exit code 0条件查询-terms
public class ESTermQuery {
public static void main(String[] args) throws IOException {
//连接ES客户端
RestHighLevelClient esClient =
new RestHighLevelClient(RestClient.builder(new HttpHost("localhost", 9200, "http")));
SearchRequest request = new SearchRequest();
request.indices("user");
//构建查询的请求体
SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
sourceBuilder.query(QueryBuilders.termsQuery("age","18","20","23"));
SearchResponse response = esClient.search(request.source(sourceBuilder), RequestOptions.DEFAULT);
//查询匹配
SearchHits hits = response.getHits();
System.out.println("响应时间:"+response.getTook());
System.out.println("是否超时:"+response.isTimedOut());
System.out.println("命中数量:"+hits.getTotalHits());
System.out.println("MaxScore:"+hits.getMaxScore());
System.out.println("详细数据:");
for (SearchHit hit : hits) {
//输出每条查询的结果信息
System.out.println(hit.getSourceAsString());
}
//关闭ES客户端
esClient.close();
}
}- 结果
响应时间:185ms
是否超时:false
命中数量:2 hits
MaxScore:1.0
详细数据:
{"name":"可乐","sex":"男","age":18}
{"name":"冰糖","sex":"女","age":20}
Process finished with exit code 0分页查询
public class ESTermQuery {
public static void main(String[] args) throws IOException {
//连接ES客户端
RestHighLevelClient esClient =
new RestHighLevelClient(RestClient.builder(new HttpHost("localhost", 9200, "http")));
//分页查询
SearchRequest request = new SearchRequest();
request.indices("user");
//构建查询的请求体
SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
sourceBuilder.query(QueryBuilders.matchAllQuery());
sourceBuilder.from(0);
sourceBuilder.size(2);
SearchResponse response = esClient.search(request.source(sourceBuilder), RequestOptions.DEFAULT);
//查询匹配
SearchHits hits = response.getHits();
System.out.println("响应时间:"+response.getTook());
System.out.println("是否超时:"+response.isTimedOut());
System.out.println("命中数量:"+hits.getTotalHits());
System.out.println("MaxScore:"+hits.getMaxScore());
System.out.println("详细数据:");
for (SearchHit hit : hits) {
//输出每条查询的结果信息
System.out.println(hit.getSourceAsString());
}
//关闭ES客户端
esClient.close();
}
}结果:
响应时间:2ms
是否超时:false
命中数量:5 hits
MaxScore:1.0
详细数据:
{"name":"可乐","sex":"男","age":18}
{"name":"冰糖","sex":"女","age":20}
Process finished with exit code 0排序查询
public class ESTermQuery {
public static void main(String[] args) throws IOException {
//连接ES客户端
RestHighLevelClient esClient =
new RestHighLevelClient(RestClient.builder(new HttpHost("localhost", 9200, "http")));
//查询排序
SearchRequest request = new SearchRequest();
request.indices("user");
//构建查询的请求体
SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
sourceBuilder.query(QueryBuilders.matchAllQuery());
sourceBuilder.sort("age", SortOrder.DESC);
SearchResponse response = esClient.search(request.source(sourceBuilder), RequestOptions.DEFAULT);
//查询匹配
SearchHits hits = response.getHits();
System.out.println("响应时间:"+response.getTook());
System.out.println("是否超时:"+response.isTimedOut());
System.out.println("命中数量:"+hits.getTotalHits());
System.out.println("MaxScore:"+hits.getMaxScore());
System.out.println("详细数据:");
for (SearchHit hit : hits) {
//输出每条查询的结果信息
System.out.println(hit.getSourceAsString());
}
//关闭ES客户端
esClient.close();
}
}结果:
响应时间:59ms
是否超时:false
命中数量:5 hits
MaxScore:NaN
详细数据:
{"name":"蜜桃","sex":"女","age":30}
{"name":"酸橙","sex":"男","age":24}
{"name":"雪梨","sex":"女","age":22}
{"name":"冰糖","sex":"女","age":20}
{"name":"可乐","sex":"男","age":18}
Process finished with exit code 0过滤字段
public class ESTermQuery {
public static void main(String[] args) throws IOException {
//连接ES客户端
RestHighLevelClient esClient =
new RestHighLevelClient(RestClient.builder(new HttpHost("localhost", 9200, "http")));
//过滤字段
SearchRequest request = new SearchRequest();
request.indices("user");
//构建查询的请求体
SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
sourceBuilder.query(QueryBuilders.matchAllQuery());
String[] excludes={"age"};
String[] includes={"name"};
sourceBuilder.fetchSource(includes,excludes);
SearchResponse response = esClient.search(request.source(sourceBuilder), RequestOptions.DEFAULT);
//查询匹配
SearchHits hits = response.getHits();
System.out.println("响应时间:"+response.getTook());
System.out.println("是否超时:"+response.isTimedOut());
System.out.println("命中数量:"+hits.getTotalHits());
System.out.println("MaxScore:"+hits.getMaxScore());
System.out.println("详细数据:");
for (SearchHit hit : hits) {
//输出每条查询的结果信息
System.out.println(hit.getSourceAsString());
}
//关闭ES客户端
esClient.close();
}
}- 结果:
响应时间:3ms
是否超时:false
命中数量:5 hits
MaxScore:1.0
详细数据:
{"name":"可乐"}
{"name":"冰糖"}
{"name":"雪梨"}
{"name":"酸橙"}
{"name":"蜜桃"}
Process finished with exit code 0Bool查询
public class ESTermQuery {
public static void main(String[] args) throws IOException {
//连接ES客户端
RestHighLevelClient esClient =
new RestHighLevelClient(RestClient.builder(new HttpHost("localhost", 9200, "http")));
//组合查询
SearchRequest request = new SearchRequest();
request.indices("user");
//构建查询的请求体
SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
//必须包含
boolQueryBuilder.must(QueryBuilders.matchQuery("age","30"));
//一定不含
boolQueryBuilder.mustNot(QueryBuilders.matchQuery("username","可乐"));
//可能包含
boolQueryBuilder.should(QueryBuilders.matchQuery("sex","男"));
sourceBuilder.query(boolQueryBuilder);
SearchResponse response = esClient.search(request.source(sourceBuilder), RequestOptions.DEFAULT);
//查询匹配
SearchHits hits = response.getHits();
System.out.println("响应时间:"+response.getTook());
System.out.println("是否超时:"+response.isTimedOut());
System.out.println("命中数量:"+hits.getTotalHits());
System.out.println("MaxScore:"+hits.getMaxScore());
System.out.println("详细数据:");
for (SearchHit hit : hits) {
//输出每条查询的结果信息
System.out.println(hit.getSourceAsString());
}
//关闭ES客户端
esClient.close();
}
}结果:
响应时间:68ms
是否超时:false
命中数量:1 hits
MaxScore:1.0
详细数据:
{"name":"蜜桃","sex":"女","age":30}
Process finished with exit code 0范围查询
public class ESTermQuery {
public static void main(String[] args) throws IOException {
//连接ES客户端
RestHighLevelClient esClient =
new RestHighLevelClient(RestClient.builder(new HttpHost("localhost", 9200, "http")));
//范围查询
SearchRequest request = new SearchRequest();
request.indices("user");
//构建查询的请求体
SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("age");
rangeQuery.gte(30);
rangeQuery.lte(40);
sourceBuilder.query(rangeQuery);
request.source(sourceBuilder);
SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);
//查询匹配
SearchHits hits = response.getHits();
System.out.println("took:" + response.getTook());
System.out.println("timeout:" + response.isTimedOut());
System.out.println("total:" + hits.getTotalHits());
System.out.println("MaxScore:" + hits.getMaxScore());
for (SearchHit hit : hits) {
// 输出每条查询的结果信息
System.out.println(hit.getSourceAsString());
}
//关闭ES客户端
esClient.close();
}
}结果:
took:1ms
timeout:false
total:1 hits
MaxScore:1.0
{"name":"蜜桃","sex":"女","age":30}
Process finished with exit code 0模糊查询
public class ESTermQuery {
public static void main(String[] args) throws IOException {
//连接ES客户端
RestHighLevelClient esClient =
new RestHighLevelClient(RestClient.builder(new HttpHost("localhost", 9200, "http")));
//模糊查询
SearchRequest request = new SearchRequest();
request.indices("user");
//构建查询的请求体
SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
QueryBuilders.fuzzyQuery("name","wangwu").fuzziness(Fuzziness.ONE);
request.source(sourceBuilder);
SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);
//查询匹配
SearchHits hits = response.getHits();
System.out.println("took:" + response.getTook());
System.out.println("timeout:" + response.isTimedOut());
System.out.println("total:" + hits.getTotalHits());
System.out.println("MaxScore:" + hits.getMaxScore());
for (SearchHit hit : hits) {
// 输出每条查询的结果信息
System.out.println(hit.getSourceAsString());
}
//关闭ES客户端
esClient.close();
}
}结果:
took:2ms
timeout:false
total:5 hits
MaxScore:1.0
详细数据：
{"name":"可乐","sex":"男","age":18}
{"name":"冰糖","sex":"女","age":20}
{"name":"雪梨","sex":"女","age":22}
{"name":"酸橙","sex":"男","age":24}
{"name":"蜜桃","sex":"女","age":30}
Process finished with exit code 0高亮查询
public class ESTermQuery {
public static void main(String[] args) throws IOException {
//连接ES客户端
RestHighLevelClient esClient =
new RestHighLevelClient(RestClient.builder(new HttpHost("localhost", 9200, "http")));
//高亮查询
SearchRequest request = new SearchRequest();
request.indices("user");
//构建查询的请求体
SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
TermsQueryBuilder termsQueryBuilder = QueryBuilders.termsQuery("age", "18","20");
sourceBuilder.query(termsQueryBuilder);
HighlightBuilder highlightBuilder = new HighlightBuilder();
highlightBuilder.preTags("<font color='red'>");
highlightBuilder.postTags("</font>");
highlightBuilder.field("age");
request.source(sourceBuilder);
SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);
//查询匹配
SearchHits hits = response.getHits();
System.out.println("took:" + response.getTook());
System.out.println("timeout:" + response.isTimedOut());
System.out.println("total:" + hits.getTotalHits());
System.out.println("MaxScore:" + hits.getMaxScore());
System.out.println("详细数据：");
for (SearchHit hit : hits) {
// 输出每条查询的结果信息
System.out.println(hit.getSourceAsString());
}
//关闭ES客户端
esClient.close();
}
}结果:
聚合查询
最大年龄
public class EsArrgQuery {
public static void main(String[] args) throws IOException {
// 连接 ES 客户端
RestHighLevelClient esClient = new RestHighLevelClient(
RestClient.builder(new HttpHost("localhost",9200,"http")));
// 高亮查询
SearchRequest request = new SearchRequest().indices("user");
SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
sourceBuilder.aggregation(AggregationBuilders.max("maxAge").field("age"));
// 3.客户端发送请求，获取响应对象
SearchResponse response = esClient.search(request.source(sourceBuilder), RequestOptions.DEFAULT);
// 4.打印响应结果
System.out.println(response);
// 关闭 ES 客户端
esClient.close();
}
}分组统计
public class EsArrgQuery {
public static void main(String[] args) throws IOException {
// 连接 ES 客户端
RestHighLevelClient esClient = new RestHighLevelClient(
RestClient.builder(new HttpHost("localhost",9200,"http")));
// 高亮查询
SearchRequest request = new SearchRequest().indices("user");
SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
sourceBuilder.aggregation(AggregationBuilders.terms("ageGroupby").field("age"));
// 3.客户端发送请求，获取响应对象
SearchResponse response = esClient.search(request.source(sourceBuilder), RequestOptions.DEFAULT);
// 4.打印响应结果
SearchHits hits = response.getHits();
System.out.println(response);
// 关闭 ES 客户端
esClient.close();
}
}
