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Elasticsearch-Java操作篇

2023-08-10 104
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简介： Elasticsearch-Java操作篇

通常情况下，都是使用编程语言来操作es，本篇带来如何用java操作es。

创建maven项目导入依赖

        <dependency>
            <groupId>org.elasticsearch</groupId>
            <artifactId>elasticsearch</artifactId>
            <version>7.17.5</version>
        </dependency>
        <!-- elasticsearch 的客户端 -->
        <dependency>
            <groupId>org.elasticsearch.client</groupId>
            <artifactId>elasticsearch-rest-high-level-client</artifactId>
            <version>7.17.5</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>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.80</version>
        </dependency>

准备

POST /student/_doc/1001
{
"name":"zhangsan",
"nickname":"zhangsan",
 "sex":"男",
 "age":30
}
POST /student/_doc/1002
{
"name":"lisi",
"nickname":"lisi",
 "sex":"男",
 "age":20 
}
POST /student/_doc/1003
{
"name":"wangwu",
 "nickname":"wangwu",
 "sex":"女",
 "age":40 
}
POST /student/_doc/1004
{
"name":"zhangsan1",
"nickname":"zhangsan1",
 "sex":"女",
 "age":50 
}
POST /student/_doc/1005
{
"name":"zhangsan2",
"nickname":"zhangsan2",
 "sex":"女",
 "age":30 
}

public class User {
    private String name;
    private Integer age;
    private String sex;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Integer getAge() {
        return age;
    }
    public void setAge(Integer age) {
        this.age = age;
    }
    public String getSex() {
        return sex;
    }
    public void setSex(String sex) {
        this.sex = sex;
    }
    public User(String name, Integer age, String sex) {
        this.name = name;
        this.age = age;
        this.sex = sex;
    }
    public User() {
    }
}

连接操作

  @Before
    public void init() {
        client = new RestHighLevelClient(RestClient.builder(
                new HttpHost("q1", 9200, "http"),
                new HttpHost("q1", 9200, "http"),
                new HttpHost("q1", 9200, "http")));
    }
    @After
    public void close() throws IOException {
        client.close();
    }

索引操作

创建索引

@Test
    public void createIndex() throws IOException {
        CreateIndexRequest request = new CreateIndexRequest("user");
        //在这里可以对索引创建时候进行一些细化设置，例如下行设置索引分片为5
        //request.settings(Settings.builder().put("number_of_shards", "5").build());
        CreateIndexResponse response = client.indices().create(request, RequestOptions.DEFAULT);
        System.out.println("操作状态：" + response.isAcknowledged());
    }

查询索引

   @Test
    public void searchIndex() throws IOException {
        //* 查看所有,也可以指定具体索引名称
        GetIndexRequest request = new GetIndexRequest("*");
        GetIndexResponse response = client.indices().get(request, RequestOptions.DEFAULT);
        //下面的key都代表索引
        System.out.println("aliases:" + response.getAliases());
        System.out.println("mappings:" + response.getMappings());
        System.out.println("settings:" + response.getSettings());
    }

删除索引

    @Test
    public void deleteIndex() throws IOException {
        DeleteIndexRequest request = new DeleteIndexRequest("user");
        AcknowledgedResponse response = client.indices().delete(request, RequestOptions.DEFAULT);
        System.out.println("操作结果 ： " + response.isAcknowledged());
    }

文档操作

创建文档

   @Test
    public void createDocument() throws IOException {
        //重复新增相当于修改
        IndexRequest request = new IndexRequest();
        //如果id不指定就是用默认随机字符串
        request.index("user").id("1");
        User user = new User("法外狂徒张三", 35, "男");
        //这里将user写成json字符串进行导入，任何转json包都可以使用
        request.source(JSONObject.toJSONString(user), XContentType.JSON);
        IndexResponse response = client.index(request, RequestOptions.DEFAULT);
        System.out.println("_index:" + response.getIndex());
        System.out.println("_id:" + response.getId());
        System.out.println("_result:" + response.getResult());
    }

批量创建文档

  @Test
    public void batchCreateDocuments() throws IOException {
        //批量新增，但是可以重复新增，相当于修改
        BulkRequest request = new BulkRequest();
        request.add(new IndexRequest().index("user").id("1004").source(XContentType.JSON, "name", "zhangsan"));
        request.add(new IndexRequest().index("user").id("1005").source(XContentType.JSON, "name", "lisi"));
        request.add(new IndexRequest().index("user").id("1006").source(XContentType.JSON, "name", "wangwu"));
        BulkResponse responses = client.bulk(request, RequestOptions.DEFAULT);
        System.out.println("took:" + responses.getTook());
        BulkItemResponse[] items = responses.getItems();
        for (BulkItemResponse item : items) {
            System.out.println("items:" + item.getResponse());
        }
    }

更新文档

@Test
    public void updateDocument() throws IOException {
        UpdateRequest request = new UpdateRequest();
        request.index("user").id("gXjB94EBIFfPOUf19kof");
        //后面跟key,value 按照顺序
        request.doc(XContentType.JSON, "sex", "男", "age", 14);
        UpdateResponse response = client.update(request, RequestOptions.DEFAULT);
        System.out.println("_index:" + response.getIndex());
        System.out.println("_id:" + response.getId());
        System.out.println("_result:" + response.getResult());
    }

查询文档

    @Test
    public void searchDocument() throws IOException {
        //查询单条文档
        GetRequest request = new GetRequest().index("user").id("gXjB94EBIFfPOUf19kof");
        GetResponse response = client.get(request, RequestOptions.DEFAULT);
        System.out.println("_index:" + response.getIndex());
        System.out.println("_type:" + response.getType());
        System.out.println("_id:" + response.getId());
        System.out.println("source:" + response.getSourceAsString());
    }

删除文档

@Test
    public void deleteDocument() throws IOException {
        DeleteRequest request = new DeleteRequest().index("user").id("1");
        DeleteResponse response = client.delete(request, RequestOptions.DEFAULT);
        System.out.println(response.toString());
    }

批量删除文档

 @Test
    public void batchDeleteDocuments() throws IOException {
        BulkRequest request = new BulkRequest();
        request.add(new DeleteRequest().index("user").id("1001"));
        request.add(new DeleteRequest().index("user").id("1002"));
        request.add(new DeleteRequest().index("user").id("1003"));
        BulkResponse responses = client.bulk(request, RequestOptions.DEFAULT);
        System.out.println("took:" + responses.getTook());
        System.out.println("items:" + responses.getItems());
    }

查询操作

查询所有索引数据

@Test
    public void searchAllIndexes() throws IOException {
        SearchRequest request = new SearchRequest();
        request.indices("fluid,earthquake_basic_info");
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        sourceBuilder.query(QueryBuilders.matchAllQuery());
        //7版本默认只查询10000条，设置true查询所有，否则 hits.getTotalHits() 只有10000
        sourceBuilder.trackTotalHits(true);
        //默认十条
        sourceBuilder.size(20);
        request.source(sourceBuilder);
        SearchResponse response = client.search(request, RequestOptions.DEFAULT);
        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("hits========>>");
        for (SearchHit hit : hits) {
            System.out.println(hit.getSourceAsString());
        }
        System.out.println("<<========");
    }

查询关键字

@Test
    public void termQuery() throws IOException {
        SearchRequest request = new SearchRequest();
        request.indices("student");
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        sourceBuilder.query(QueryBuilders.termQuery("name", "zhangsan"));
        request.source(sourceBuilder);
        SearchResponse response = client.search(request, RequestOptions.DEFAULT);
        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("hits========>>");
        for (SearchHit hit : hits) {
            System.out.println(hit.getSourceAsString());
        }
        System.out.println("<<========");
    }

分页查询

 @Test
    public void limitQuery() throws IOException {
        SearchRequest request = new SearchRequest();
        request.indices("student");
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        sourceBuilder.query(QueryBuilders.matchAllQuery());
        sourceBuilder.from(0);
        sourceBuilder.size(2);
        request.source(sourceBuilder);
        SearchResponse response = client.search(request, RequestOptions.DEFAULT);
        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("hits========>>");
        for (SearchHit hit : hits) {
            System.out.println(hit.getSourceAsString());
        }
        System.out.println("<<========");
    }

排序

 @Test
    public void sortQuery() throws IOException {
        SearchRequest request = new SearchRequest();
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        sourceBuilder.query(QueryBuilders.matchAllQuery());
        sourceBuilder.sort("age", SortOrder.ASC);
        request.source(sourceBuilder);
        SearchResponse response = client.search(request, RequestOptions.DEFAULT);
        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("hits========>>");
        for (SearchHit hit : hits) {
            System.out.println(hit.getSourceAsString());
        }
        System.out.println("<<========");
    }

过滤

@Test
    public void filterAttributes() throws IOException {
        SearchRequest request = new SearchRequest();
        request.indices("student");
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        sourceBuilder.query(QueryBuilders.matchAllQuery());
        String[] excludes = {}; //不想要的字段
        String[] includes = {"name", "age"}; //想要的字段
        sourceBuilder.fetchSource(includes, excludes);
        request.source(sourceBuilder);
        SearchResponse response = client.search(request, RequestOptions.DEFAULT);
        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("hits========>>");
        for (SearchHit hit : hits) {
            System.out.println(hit.getSourceAsString());
        }
        System.out.println("<<========");
    }

bool查询

@Test
    public void boolQuery() throws IOException {
        SearchRequest request = new SearchRequest();
        request.indices("student");
        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("name", "zhangsan"));
        //可能包含
        boolQueryBuilder.should(QueryBuilders.matchQuery("sex", "男"));
        sourceBuilder.query(boolQueryBuilder);
        request.source(sourceBuilder);
        SearchResponse response = client.search(request, RequestOptions.DEFAULT);
        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("hits========>>");
        for (SearchHit hit : hits) {
            System.out.println(hit.getSourceAsString());
        }
        System.out.println("<<========");
    }

范围查询

@Test
    public void scopeQuery() throws IOException {
        SearchRequest request = new SearchRequest();
        request.indices("student");
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("age");
        // 大于等于
        rangeQuery.gte("30");
        // 小于等于
        rangeQuery.lte("40");
        sourceBuilder.query(rangeQuery);
        request.source(sourceBuilder);
        SearchResponse response = client.search(request, RequestOptions.DEFAULT);
        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("hits========>>");
        for (SearchHit hit : hits) {
            System.out.println(hit.getSourceAsString());
        }
        System.out.println("<<========");
    }

模糊查询

@Test
    public void fuzzQuery() throws IOException {
        SearchRequest request = new SearchRequest();
        request.indices("student");
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        sourceBuilder.query(QueryBuilders.fuzzyQuery("name", "zhangsan").fuzziness(Fuzziness.ONE));
        request.source(sourceBuilder);
        SearchResponse response = client.search(request, RequestOptions.DEFAULT);
        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("hits========>>");
        for (SearchHit hit : hits) {
            System.out.println(hit.getSourceAsString());
        }
        System.out.println("<<========");
    }

高亮查询

@Test
    public void highLightQuery() throws IOException {
        SearchRequest request = new SearchRequest().indices("student");
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        TermsQueryBuilder termsQueryBuilder = QueryBuilders.termsQuery("name", "zhangsan");
        sourceBuilder.query(termsQueryBuilder);
        HighlightBuilder highlightBuilder = new HighlightBuilder();
        highlightBuilder.preTags("<font color='red'>");//设置标签前缀
        highlightBuilder.postTags("</font>");//设置标签后缀
        highlightBuilder.field("name");//设置高亮字段
        sourceBuilder.highlighter(highlightBuilder);
        request.source(sourceBuilder);
        SearchResponse response = client.search(request, RequestOptions.DEFAULT);
        SearchHits hits = response.getHits();
        System.out.println("took::" + response.getTook());
        System.out.println("time_out::" + response.isTimedOut());
        System.out.println("total::" + hits.getTotalHits());
        System.out.println("max_score::" + hits.getMaxScore());
        System.out.println("hits::::>>");
        for (SearchHit hit : hits) {
            String sourceAsString = hit.getSourceAsString();
            System.out.println(sourceAsString);
            Map<String, HighlightField> highlightFields = hit.getHighlightFields();
            System.out.println(highlightFields);
        }
        System.out.println("<<::::");
    }

聚合查询

@Test
    public void maxAge() throws IOException {
        SearchRequest request = new SearchRequest().indices("student");
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        sourceBuilder.aggregation(AggregationBuilders.max("maxAge").field("age"));
        request.source(sourceBuilder);
        SearchResponse response = client.search(request, RequestOptions.DEFAULT);
        SearchHits hits = response.getHits();
        System.out.println(response);
    }

分组查询

@Test
    public void Group() throws IOException {
        SearchRequest request = new SearchRequest().indices("student");
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        sourceBuilder.aggregation(AggregationBuilders.terms("age_groupby").field("age"));
        request.source(sourceBuilder);
        SearchResponse response = client.search(request, RequestOptions.DEFAULT);
        SearchHits hits = response.getHits();
        System.out.println(response);
    }


文章标签：
检索分析服务 Elasticsearch版
Java
索引
Maven
相关实践学习
使用阿里云Elasticsearch体验信息检索加速
通过创建登录阿里云Elasticsearch集群，使用DataWorks将MySQL数据同步至Elasticsearch，体验多条件检索效果，简单展示数据同步和信息检索加速的过程和操作。
ElasticSearch 入门精讲
ElasticSearch是一个开源的、基于Lucene的、分布式、高扩展、高实时的搜索与数据分析引擎。根据DB-Engines的排名显示，Elasticsearch是最受欢迎的企业搜索引擎，其次是Apache Solr（也是基于Lucene）。 ElasticSearch的实现原理主要分为以下几个步骤： 用户将数据提交到Elastic Search 数据库中 通过分词控制器去将对应的语句分词，将其权重和分词结果一并存入数据 当用户搜索数据时候，再根据权重将结果排名、打分 将返回结果呈现给用户 Elasticsearch可以用于搜索各种文档。它提供可扩展的搜索，具有接近实时的搜索，并支持多租户。
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