java操作Elastic Search实现数据的处理

布满荆棘的人生 2024-03-24 16:03 15阅读 0赞

### 一、依赖导入 ###

在操作[Elastic][] Search首先需要导入依赖

<dependencies>
        <dependency>
            <groupId>org.elasticsearch</groupId>
            <artifactId>elasticsearch</artifactId>
            <version>7.8.0</version>
        </dependency>
        
        <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>

### 二、创建Elastic Search客户端 ###

### 三、索引相关操作 ###

#### 1、创建索引 ####

public static void main(String[] args) throws Exception {
    
         // 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("索引操作 ：" + acknowledged);
    
         esClient.close();
     }

#### 2、删除索引 ####

public static void main(String[] args) throws Exception {
    
        // 创建ES客户端
        RestHighLevelClient esClient = new RestHighLevelClient(
            RestClient.builder(new HttpHost("localhost", 9200, "http"))
        );
    
        // 删除索引
        DeleteIndexRequest request = new DeleteIndexRequest("user");
    
        AcknowledgedResponse response = esClient.indices().delete(request, RequestOptions.DEFAULT);
    
        // 响应状态
        System.out.println(response.isAcknowledged());
    
        esClient.close();
    }

#### 3、查询索引 ####

public static void main(String[] args) throws Exception {
    
        // 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();
    }

### 四、数据相关操作 ###

#### 1、插入数据 ####

//实体类
    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;
        }
    }
    //main方法
    public static void main(String[] args) throws Exception {
    
        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(30);
        user.setSex("男");
    
        // 向ES插入数据，必须将数据转换位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();
    }

#### 2、删除数据 ####

public static void main(String[] args) throws Exception {
    	
        //获取ES客户端
        RestHighLevelClient esClient = new RestHighLevelClient(
            RestClient.builder(new HttpHost("localhost", 9200, "http"))
        );
    
    	//指定删除对象
        DeleteRequest request = new DeleteRequest();
        request.index("user").id("1001");
    
        //删除数据
        DeleteResponse response = esClient.delete(request, RequestOptions.DEFAULT);
        System.out.println(response.toString());
    
        esClient.close();
    }

#### 3、获取数据 ####

public static void main(String[] args) throws Exception {
    
        //获取ES对象
        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());
    
        //关闭ES客户端
        esClient.close();
    }

#### 4、查询操作 ####

#### 5、条件查询 ####

public static void main(String[] args) throws Exception {
    
        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");
    
        request.source(new SearchSourceBuilder().query(QueryBuilders.matchAllQuery()));
    
        SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);
    
        SearchHits hits = response.getHits();
    
        System.out.println(hits.getTotalHits());
        System.out.println(response.getTook());
    
        for ( SearchHit hit : hits ) {
            System.out.println(hit.getSourceAsString());
        }
    
        //2. 条件查询 : termQuery
        SearchRequest request = new SearchRequest();
        request.indices("user");
    
        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());
        System.out.println(response.getTook());
    
        for ( SearchHit hit : hits ) {
            System.out.println(hit.getSourceAsString());
        }
    
        //3. 分页查询
        SearchRequest request = new SearchRequest();
        request.indices("user");
    
        SearchSourceBuilder builder = new SearchSourceBuilder().query(QueryBuilders.matchAllQuery());
        // (当前页码-1)*每页显示数据条数
        builder.from(2);
        builder.size(2);
        request.source(builder);
        SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);
    
        SearchHits hits = response.getHits();
    
        System.out.println(hits.getTotalHits());
        System.out.println(response.getTook());
    
        for ( SearchHit hit : hits ) {
            System.out.println(hit.getSourceAsString());
        }
    
        // 4. 查询排序
        SearchRequest request = new SearchRequest();
        request.indices("user");
    
        SearchSourceBuilder builder = new SearchSourceBuilder().query(QueryBuilders.matchAllQuery());
        //
        builder.sort("age", SortOrder.DESC);
    
        request.source(builder);
        SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);
    
        SearchHits hits = response.getHits();
    
        System.out.println(hits.getTotalHits());
        System.out.println(response.getTook());
    
        for ( SearchHit hit : hits ) {
            System.out.println(hit.getSourceAsString());
        }
    
        // 5. 过滤字段
        SearchRequest request = new SearchRequest();
        request.indices("user");
    
        SearchSourceBuilder builder = new SearchSourceBuilder().query(QueryBuilders.matchAllQuery());
        //
        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());
        System.out.println(response.getTook());
    
        for ( SearchHit hit : hits ) {
            System.out.println(hit.getSourceAsString());
        }
    
        // 6. 组合查询
        SearchRequest request = new SearchRequest();
        request.indices("user");
    
        SearchSourceBuilder builder = new SearchSourceBuilder();
        BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
    
        //boolQueryBuilder.must(QueryBuilders.matchQuery("age", 30));
        //boolQueryBuilder.must(QueryBuilders.matchQuery("sex", "男"));
        //boolQueryBuilder.mustNot(QueryBuilders.matchQuery("sex", "男"));
        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());
        System.out.println(response.getTook());
    
        for ( SearchHit hit : hits ) {
            System.out.println(hit.getSourceAsString());
        }
    
        // 7. 范围查询
        SearchRequest request = new SearchRequest();
        request.indices("user");
    
        SearchSourceBuilder builder = new SearchSourceBuilder();
        RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("age");
    
        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());
        System.out.println(response.getTook());
    
        for ( SearchHit hit : hits ) {
            System.out.println(hit.getSourceAsString());
        }
    
        //8. 模糊查询
        SearchRequest request = new SearchRequest();
        request.indices("user");
    
        SearchSourceBuilder builder = new SearchSourceBuilder();
        builder.query(QueryBuilders.fuzzyQuery("name", "wangwu").fuzziness(Fuzziness.TWO));
    
        request.source(builder);
        SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);
    
        SearchHits hits = response.getHits();
    
        System.out.println(hits.getTotalHits());
        System.out.println(response.getTook());
    
        for ( SearchHit hit : hits ) {
            System.out.println(hit.getSourceAsString());
        }
    
        // 9. 高亮查询
        SearchRequest request = new SearchRequest();
        request.indices("user");
    
        SearchSourceBuilder builder = new SearchSourceBuilder();
        TermsQueryBuilder termsQueryBuilder = QueryBuilders.termsQuery("name", "zhangsan");
    
        HighlightBuilder highlightBuilder = new HighlightBuilder();
        highlightBuilder.preTags("<font color='red'>");
        highlightBuilder.postTags("</font>");
        highlightBuilder.field("name");
    
        builder.highlighter(highlightBuilder);
        builder.query(termsQueryBuilder);
    
        request.source(builder);
        SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);
    
        SearchHits hits = response.getHits();
    
        System.out.println(hits.getTotalHits());
        System.out.println(response.getTook());
    
        for ( SearchHit hit : hits ) {
            System.out.println(hit.getSourceAsString());
        }
    
        // 10. 聚合查询
        SearchRequest request = new SearchRequest();
        request.indices("user");
    
        SearchSourceBuilder builder = new SearchSourceBuilder();
    
        AggregationBuilder aggregationBuilder = AggregationBuilders.max("maxAge").field("age");
        builder.aggregation(aggregationBuilder);
    
        request.source(builder);
        SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);
    
        SearchHits hits = response.getHits();
    
        System.out.println(hits.getTotalHits());
        System.out.println(response.getTook());
    
        for ( SearchHit hit : hits ) {
            System.out.println(hit.getSourceAsString());
        }
    
        // 11. 分组查询
        SearchRequest request = new SearchRequest();
        request.indices("user");
    
        SearchSourceBuilder builder = new SearchSourceBuilder();
    
        AggregationBuilder aggregationBuilder = AggregationBuilders.terms("ageGroup").field("age");
        builder.aggregation(aggregationBuilder);
    
        request.source(builder);
        SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);
    
        SearchHits hits = response.getHits();
    
        System.out.println(hits.getTotalHits());
        System.out.println(response.getTook());
    
        for ( SearchHit hit : hits ) {
            System.out.println(hit.getSourceAsString());
        }
    
        //关闭ES客户端
        esClient.close();
    }

#### 6、更新数据 ####

public static void main(String[] args) throws Exception {
    
        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();
    }

### 五、批处理 ###

#### 1、批量新增 ####

public static void main(String[] args) throws Exception {
    
        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", "age",30,"sex","男"));
        request.add(new IndexRequest().index("user").id("1002").source(XContentType.JSON, "name", "lisi", "age",30,"sex","女"));
        request.add(new IndexRequest().index("user").id("1003").source(XContentType.JSON, "name", "wangwu", "age",40,"sex","男"));
        request.add(new IndexRequest().index("user").id("1004").source(XContentType.JSON, "name", "wangwu1", "age",40,"sex","女"));
        request.add(new IndexRequest().index("user").id("1005").source(XContentType.JSON, "name", "wangwu2", "age",50,"sex","男"));
        request.add(new IndexRequest().index("user").id("1006").source(XContentType.JSON, "name", "wangwu3", "age",50,"sex","男"));
        request.add(new IndexRequest().index("user").id("1007").source(XContentType.JSON, "name", "wangwu44", "age",60,"sex","男"));
        request.add(new IndexRequest().index("user").id("1008").source(XContentType.JSON, "name", "wangwu555", "age",60,"sex","男"));
        request.add(new IndexRequest().index("user").id("1009").source(XContentType.JSON, "name", "wangwu66666", "age",60,"sex","男"));
    
        BulkResponse response = esClient.bulk(request, RequestOptions.DEFAULT);
        System.out.println(response.getTook());
        System.out.println(response.getItems());
    
        esClient.close();
    }

#### 2、批量删除 ####

public static void main(String[] args) throws Exception {
    
        RestHighLevelClient esClient = new RestHighLevelClient(
            RestClient.builder(new HttpHost("localhost", 9200, "http"))
        );
    
        // 批量删除数据
        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 response = esClient.bulk(request, RequestOptions.DEFAULT);
        System.out.println(response.getTook());
        System.out.println(response.getItems());
    
        esClient.close();
    }

[Elastic]: https://so.csdn.net/so/search?q=Elastic&spm=1001.2101.3001.7020