java es date类型设置

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我心依旧 2024-09-26 22:22:22

文章标签 java es date类型设置 elasticsearch java 搜索引擎 System 文章分类 Java 后端开发

Elasticsearch基本操作

文章目录

Elasticsearch基本操作

一、访问ES服务器
二、索引操作

2.1 创建索引
2.2 查看索引
2.3 删除索引

三、文档操作

3.1 创建文档
3.2 修改文档
3.3 查询文档
3.4 删除文档

四、批量操作

4.1 批量插入文档
4.2 批量删除文档
4.3 查询操作

一、访问ES服务器

1. 导入依赖

<!-- elasticsearch的客户端 -->
<dependency>
    <groupId>org.elasticsearch.client</groupId>
    <artifactId>elasticsearch-rest-high-level-client</artifactId>
    <version>7.8.0</version>
</dependency>
<!--操作过程需要JSON转换-->
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.9.9</version>
</dependency>

2. 访问ES服务器

//开启ES客户端
RestHighLevelClient client = new RestHighLevelClient(
    RestClient.builder(new HttpHost("localhost", 9200, "http"))
);

//关闭ES客户端
client.close();

二、索引操作

2.1 创建索引

//开启ES客户端
RestHighLevelClient client = new RestHighLevelClient(
    RestClient.builder(new HttpHost("localhost", 9200, "http"))
);

//创建索引请求，参数中指定索引的名称
CreateIndexRequest indexRequest = new CreateIndexRequest("person");
//发起请求得到响应
CreateIndexResponse response = client.indices().create(indexRequest, RequestOptions.DEFAULT);

//获取响应状态
boolean acknowledged = response.isAcknowledged();
System.out.println("创建索引结果：" + acknowledged); //true

//关闭ES客户端
client.close();

2.2 查看索引

//开启ES客户端
RestHighLevelClient client = new RestHighLevelClient(RestClient.builder(new HttpHost("localhost", 9200, "http")));

//查询索引请求
GetIndexRequest indexRequest = new GetIndexRequest("person");
GetIndexResponse response = client.indices().get(indexRequest, RequestOptions.DEFAULT);

//获取响应状态
System.out.println(Arrays.toString(response.getIndices())); //[person]

//关闭ES客户端
client.close();

2.3 删除索引

//开启ES客户端
RestHighLevelClient esClient = new RestHighLevelClient(
    RestClient.builder(new HttpHost("localhost", 9200, "http"))
);

//发起删除索引请求
DeleteIndexRequest request = new DeleteIndexRequest("person");
AcknowledgedResponse response = esClient.indices().delete(request, RequestOptions.DEFAULT);

//得到响应状态
System.out.println(response.isAcknowledged()); //true

//关闭客户端
esClient.close();

三、文档操作

3.1 创建文档

1. 创建所要插入的文档对象

public class Person {
    private String name;
    private String sex;
    private Integer age;
    //以及Java Bean的其他结构
}

2. 插入文档到对应的索引

import com.fasterxml.jackson.databind.ObjectMapper;

//开启ES服务器
RestHighLevelClient esClient = new RestHighLevelClient(
    RestClient.builder(new HttpHost("localhost", 9200, "http"))
);

//插入数据
IndexRequest request = new IndexRequest();
//参数1表示所要插入的索引，参数2指定插入文档的id值
request.index("person").id("1001");

//给文档对象属性赋值
Person person = new Person();
person.setName("zhangsan");
person.setAge(30);
person.setSex("男");

//向ES插入数据，必须将其转换成JSON格式
ObjectMapper mapper = new ObjectMapper();
String value = mapper.writeValueAsString(person);
//可以理解为携带的JSON格式的请求体
request.source(value, XContentType.JSON);

//得到响应结果
IndexResponse indexResponse = esClient.index(request, RequestOptions.DEFAULT);
System.out.println(indexResponse.getResult()); //CREATED

//关闭ES客户端
esClient.close();

3.2 修改文档

//开启ES服务器
RestHighLevelClient esClient = new RestHighLevelClient(
    RestClient.builder(new HttpHost("localhost", 9200, "http"))
);

//创建修改请求
UpdateRequest request = new UpdateRequest();
//参数1表示所要修改的索引，参数2指定修改文档的id值
request.index("person").id("1001");
//设置请求体，对数据进行修改，参数2表示字段名，参数3表示所要修改的值
request.doc(XContentType.JSON, "sex", "女");

//得到响应结果
UpdateResponse response = esClient.update(request, RequestOptions.DEFAULT);

//关闭ES客户端
esClient.close();

3.3 查询文档

//创建查询请求
GetRequest getRequest = new GetRequest().index("person").id("1001");
GetResponse response = esClient.get(getRequest, RequestOptions.DEFAULT);

//打印结果信息
System.out.println(response.getIndex()); //person
System.out.println(response.getId()); //1001
System.out.println(response.getSourceAsString()); //{"name":"zhangsan","sex":"男","age":"22"}

3.4 删除文档

//开启ES服务器
RestHighLevelClient esClient = new RestHighLevelClient(
    RestClient.builder(new HttpHost("localhost", 9200, "http"))
);

//创建查询请求
DeleteRequest deleteRequest = new DeleteRequest().index("person").id("1001");
DeleteResponse response = esClient.delete(deleteRequest, RequestOptions.DEFAULT);

//打印结果信息
System.out.println(response.getIndex()); //person
System.out.println(response.getId()); //1001

//关闭ES客户端
esClient.close();

四、批量操作

4.1 批量插入文档

// 创建批量操作的请求对象
BulkRequest request = new BulkRequest();

// 一次创建多个文档
request.add(new IndexRequest().index("person").id("1002").source(XContentType.JSON, "name", "lisi", "age", 30, "sex", "女"));
request.add(new IndexRequest().index("person").id("1003").source(XContentType.JSON, "name", "wangwu", "age", 40, "sex", "男"));
request.add(new IndexRequest().index("person").id("1004").source(XContentType.JSON, "name", "wangwu1", "age", 40, "sex", "女"));
request.add(new IndexRequest().index("person").id("1005").source(XContentType.JSON, "name", "wangwu2", "age", 50, "sex", "男"));
request.add(new IndexRequest().index("person").id("1006").source(XContentType.JSON, "name", "wangwu3", "age", 50, "sex", "男"));
request.add(new IndexRequest().index("person").id("1007").source(XContentType.JSON, "name", "wangwu44", "age", 60, "sex", "男"));
request.add(new IndexRequest().index("person").id("1008").source(XContentType.JSON, "name", "wangwu555", "age", 60, "sex", "男"));
request.add(new IndexRequest().index("person").id("1009").source(XContentType.JSON, "name", "wangwu66666", "age", 60, "sex", "男"));

// bulk表示批量操作
BulkResponse response = esClient.bulk(request, RequestOptions.DEFAULT);

// 得到操作的时长
System.out.println(response.getTook()); //14ms

4.2 批量删除文档

// 创建批量操作对象
BulkRequest request = new BulkRequest();

// 添加批量操作
request.add(new DeleteRequest().index("user").id("1002"));
request.add(new DeleteRequest().index("user").id("1003"));

// 执行批量操作
BulkResponse response = esClient.bulk(request, RequestOptions.DEFAULT);

System.out.println(response.getTook()); //12ms

4.3 查询操作

4.3.1 查询索引中的全部文档

// 创建查询请求
SearchRequest request = new SearchRequest();
// 指定查询索引
request.indices("person");

// 指定查询条件，matchAllQuery表示查询所有文档
request.source(new SearchSourceBuilder().query(QueryBuilders.matchAllQuery()));

//执行查询
SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);

// 得到查询结果
SearchHits hits = response.getHits();
System.out.println(hits.getTotalHits());

// 得到查询结果
for ( SearchHit hit : hits ) {
    System.out.println(hit.getSourceAsString());
}

运行结果：

java es date类型设置_System

4.3.2 条件查询

SearchRequest request = new SearchRequest();
request.indices("person");

//只查询出age等于30的文档
request.source(new SearchSourceBuilder().query(QueryBuilders.termQuery("age", 30)));
SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);

SearchHits hits = response.getHits();

System.out.println(hits.getTotalHits());
for ( SearchHit hit : hits ) {
    System.out.println(hit.getSourceAsString());
}

4.3.3 分页查询

SearchRequest request = new SearchRequest();
request.indices("person");

// 查询所有文档
SearchSourceBuilder builder = new SearchSourceBuilder().query(QueryBuilders.matchAllQuery());

//设定页码条件
builder.from(2);
builder.size(2);

request.source(builder);

// 得到响应结果
SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);

SearchHits hits = response.getHits();
System.out.println(hits.getTotalHits());
for ( SearchHit hit : hits ) {
    System.out.println(hit.getSourceAsString());
}

4.3.4 查询排序

SearchRequest request = new SearchRequest();
request.indices("person");

SearchSourceBuilder builder = new SearchSourceBuilder().query(QueryBuilders.matchAllQuery());

// 查询结果按照age字段排序
builder.sort("age", SortOrder.DESC);
request.source(builder);

SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);

SearchHits hits = response.getHits();

System.out.println(hits.getTotalHits());
for ( SearchHit hit : hits ) {
    System.out.println(hit.getSourceAsString());
}

java es date类型设置_java es date类型设置_02

4.3.5 过滤字段

SearchRequest request = new SearchRequest();
request.indices("person");

SearchSourceBuilder builder = new SearchSourceBuilder().query(QueryBuilders.matchAllQuery());

// 结果不包含age字段
String[] excludes = {"age"};
String[] includes = {};
builder.fetchSource(includes, excludes);

request.source(builder);
SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);

SearchHits hits = response.getHits();
System.out.println(hits.getTotalHits());
for ( SearchHit hit : hits ) {
    System.out.println(hit.getSourceAsString());
}

java es date类型设置_java_03

4.3.6 多个条件组合查询

SearchRequest request = new SearchRequest();
request.indices("person");

SearchSourceBuilder builder = new SearchSourceBuilder();

// boolQuery表示组合查询
BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();

//must表示且
//boolQueryBuilder.must(QueryBuilders.matchQuery("age", 30));
//boolQueryBuilder.must(QueryBuilders.matchQuery("sex", "男"));

//should表示或，也就是说age等于30或40的人都可以查询出来
boolQueryBuilder.should(QueryBuilders.matchQuery("age", 30));
boolQueryBuilder.should(QueryBuilders.matchQuery("age", 40));

builder.query(boolQueryBuilder);

request.source(builder);
SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);

SearchHits hits = response.getHits();

System.out.println(hits.getTotalHits());

for ( SearchHit hit : hits ) {
    System.out.println(hit.getSourceAsString());
}

4.3.7 范围查询

SearchRequest request = new SearchRequest();
request.indices("person");

SearchSourceBuilder builder = new SearchSourceBuilder();

// 对age字段进行范围查询
RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("age");

// age大于等于30，小于50
rangeQuery.gte(30);
rangeQuery.lt(50);

builder.query(rangeQuery);

request.source(builder);
SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);

SearchHits hits = response.getHits();
System.out.println(hits.getTotalHits());
for ( SearchHit hit : hits ) {
    System.out.println(hit.getSourceAsString());
}

4.3.8 模糊查询

SearchRequest request = new SearchRequest();
request.indices("person");

SearchSourceBuilder builder = new SearchSourceBuilder();

//fuzzyQuery表示模糊查询
//Fuzziness.TWO表示范围查询的步长，此处表示可以查询到与wangwu两个位置不同的结果
builder.query(QueryBuilders.fuzzyQuery("name", "wangwu").fuzziness(Fuzziness.TWO));

request.source(builder);
SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);

java es date类型设置_搜索引擎_04

4.3.9 聚合查询

求最大值

SearchRequest request = new SearchRequest();
request.indices("person");

SearchSourceBuilder builder = new SearchSourceBuilder();

//求age字段的最大值，结果名称是maxAge
AggregationBuilder aggregationBuilder = AggregationBuilders.max("maxAge").field("age");
builder.aggregation(aggregationBuilder);

request.source(builder);
SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);

分组查询

SearchRequest request = new SearchRequest();
request.indices("person");

SearchSourceBuilder builder = new SearchSourceBuilder();

//对age字段进行分组
AggregationBuilder aggregationBuilder = AggregationBuilders.terms("ageGroup").field("age");
builder.aggregation(aggregationBuilder);

request.source(builder);
SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);

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java es date类型设置

java es date类型设置

Elasticsearch基本操作

文章目录

一、访问ES服务器

二、索引操作

2.1 创建索引

2.2 查看索引

2.3 删除索引

三、文档操作

3.1 创建文档

3.2 修改文档

3.3 查询文档

3.4 删除文档

四、批量操作

4.1 批量插入文档

4.2 批量删除文档

4.3 查询操作

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