ES基本操作（JavaAPI篇）-Toy模板网

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引入jar包依赖

    <dependencies>
        <dependency>
            <groupId>org.elasticsearch</groupId>
            <artifactId>elasticsearch</artifactId>
            <version>7.8.0</version>
        </dependency>
        <!-- es客户端 -->
        <dependency>
            <groupId>org.elasticsearch.client</groupId>
            <artifactId>elasticsearch-rest-high-level-client</artifactId>
            <version>7.8.0</version>
        </dependency>
        <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>2.9.9</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
    </dependencies>

调用API创建Index

ES基本操作（JavaAPI篇）,elasticsearch,大数据,搜索引擎

查询和删除Index

        GetIndexRequest request = new GetIndexRequest("user");
        GetIndexResponse response = client.indices().get(request, RequestOptions.DEFAULT);

        System.out.println("Aliases = " + response.getAliases());
        System.out.println("Mappings = " + response.getMappings());

        // 删除
        DeleteIndexRequest deleteRequest = new DeleteIndexRequest("user");
        AcknowledgedResponse deleteResp = client.indices().delete(deleteRequest, RequestOptions.DEFAULT);
        System.out.println("deleteResp = " + deleteResp.toString());

创建和修改文档

User user = new User();
user.setName("刘德华");
user.setAge(60L);
user.setSex("男");
IndexRequest request = new IndexRequest();
request.index("user").id("1");
// 插入es需要转成json格式
request.source(JSON.toJSONString(user), XContentType.JSON);
IndexResponse index = client.index(request, RequestOptions.DEFAULT);

// 修改
UpdateRequest updateRequest = new UpdateRequest();
updateRequest.index("user").id("1");
updateRequest.doc(XContentType.JSON, "age", 65L);
UpdateResponse updateResponse = client.update(updateRequest, RequestOptions.DEFAULT);
        System.out.println(updateResponse.getResult());

查询文档和删除

// 查询
GetRequest request = new GetRequest();
request.index("user").id("1");
GetResponse documentFields = client.get(request, RequestOptions.DEFAULT);
System.out.println(documentFields.getSource());

// 删除
DeleteRequest deleteRequest = new DeleteRequest();
deleteRequest.index("user").id("1");
DeleteResponse deleteResponse = client.delete(deleteRequest, RequestOptions.DEFAULT);
System.out.println(deleteResponse.getResult());

批量新增和删除

        BulkRequest bulkRequest = new BulkRequest();
        bulkRequest.add(new IndexRequest().index("user").id("2").source(JSON.toJSONString(new User("梁朝伟", "男", 62L)), XContentType.JSON));
        bulkRequest.add(new IndexRequest().index("user").id("3").source(JSON.toJSONString(new User("黎明", "男", 58L)), XContentType.JSON));
        bulkRequest.add(new IndexRequest().index("user").id("4").source(JSON.toJSONString(new User("郭富城", "男", 55L)),XContentType.JSON));
        bulkRequest.add(new IndexRequest().index("user").id("5").source(JSON.toJSONString(new User("刘亦菲", "女", 28L)), XContentType.JSON));
        BulkResponse bulkResponse = client.bulk(bulkRequest, RequestOptions.DEFAULT);

// 批量删除
        BulkRequest bulkRequest = new BulkRequest();
        bulkRequest.add(new DeleteRequest().index("user").id("2"));
        bulkRequest.add(new DeleteRequest().index("user").id("3"));
        bulkRequest.add(new DeleteRequest().index("user").id("4"));
        bulkRequest.add(new DeleteRequest().index("user").id("5"));
        BulkResponse response = client.bulk(bulkRequest, RequestOptions.DEFAULT);

全量查询

        SearchRequest searchRequest = new SearchRequest();
        searchRequest.indices("user")
                .source(new SearchSourceBuilder().query(QueryBuilders.matchAllQuery()));
        SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);
        for (SearchHit hit : searchResponse.getHits()) {
            System.out.println(hit.getSourceAsString());
        }

对于其他的查询，需要修改“QueryBuilders.matchAllQuery()”

条件查询、排序、分页、指定查询字段

        SearchRequest searchRequest = new SearchRequest();
        searchRequest.indices("user");

        // 排除的字段
        String[] excludes = {};
        // 查询的字段
        String[] includes = {"name"};
        searchRequest.source(new SearchSourceBuilder()
                // 条件查询
                .query(QueryBuilders.termQuery("sex", "男"))
                // 指定查询的字段
                .fetchSource(includes, excludes)
                // 排序
                .sort("age", SortOrder.DESC)
                // 分页
                .from(0).size(2));
        SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);
        for (SearchHit hit : searchResponse.getHits()) {
            System.out.println(hit.getSourceAsString());
        }

组合查询、高亮显示

注意：中文自动分词，可模糊搜索。如：文章来源地址https://www.toymoban.com/news/detail-597015.html

must(QueryBuilders.matchQuery("name", "亦菲"))

        SearchRequest searchRequest = new SearchRequest();
        searchRequest.indices("user");
        searchRequest.source(
                new SearchSourceBuilder().query(
                        QueryBuilders.boolQuery()
                                // and条件
                                //.must(QueryBuilders.matchQuery("age", 28))
                                //.must(QueryBuilders.matchQuery("sex", "女"))
                                //.must(QueryBuilders.matchQuery("name", "亦菲"))
                                // or条件
                                .should(QueryBuilders.matchQuery("age", 28))
                                .should(QueryBuilders.matchQuery("age", 58))
                ).highlighter(
                        new HighlightBuilder()
                                .preTags("<font color='red'>")
                                .postTags("</font>")
                                .field("name")
                )
        );
        SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);
        for (SearchHit hit : searchResponse.getHits()) {
            System.out.println(hit.getSourceAsString());
        }

范围查询

        SearchRequest searchRequest = new SearchRequest();
        searchRequest.indices("user");
        searchRequest.source(
                new SearchSourceBuilder().query(
                        QueryBuilders.rangeQuery("age").gte(18).lt(30)
                )
        );
        SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);
        for (SearchHit hit : searchResponse.getHits()) {
            System.out.println(hit.getSourceAsString());
        }

聚合查询

        // 聚合查询
        SearchRequest searchRequest = new SearchRequest();
        searchRequest.indices("user");
        searchRequest.source(
                new SearchSourceBuilder().aggregation(
                        // 最小值
                        //AggregationBuilders.min("minAge").field("age")
                        // 分组统计
                        AggregationBuilders.terms("ageGroup").field("age")
                )
        );
        SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);

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