spring boot 项目中搭建 ElasticSearch 中间件二 Java api 操作 es

Java api 操作 es

- - [1. 准备](#1. 准备)
  - [2. 环境](#2. 环境)
  - [3. Java操作索引](#3. Java操作索引)
  - - [3.1 创建索引](#3.1 创建索引)
    - [3.2 查看索引](#3.2 查看索引)
    - [3.3 删除索引](#3.3 删除索引)
  - [4. java操作文档](#4. java操作文档)
  - - [4.1 添加文档](#4.1 添加文档)
    - [4.2 查询文档](#4.2 查询文档)
    - [4.3 查询全部文档](#4.3 查询全部文档)
    - [4.4 更新文档](#4.4 更新文档)
    - [4.5 删除文档](#4.5 删除文档)
    - [4.6 批量插入文档](#4.6 批量插入文档)
    - [4.7 批量删除文档](#4.7 批量删除文档)
    - [4.8 条件查询文档](#4.8 条件查询文档)
    - [4.9 组合查询文档](#4.9 组合查询文档)
    - [4.10 模糊查询文档](#4.10 模糊查询文档)

本文是进行ElasticSearch 的环境准备和基础操作（使用postman）之后，使用Java进行ElasticSearch 操作的文章。
ElasticSearch 系列文章目的是使用ElasticSearch结合spring boot项目实现项目的搜索功能。
系列文章：
spring boot 项目中搭建 ElasticSearch 中间件一 postman 操作 es
spring boot 项目中搭建 ElasticSearch 中间件三 spring data 操作 es

1. 准备

首先要创建一个Java maven工程

导入以下依赖：

xml 复制代码

 <!--es-->
 <dependency>
     <groupId>org.elasticsearch</groupId>
     <artifactId>elasticsearch</artifactId>
     <version>7.10.0</version>
 </dependency>
 <dependency>
     <groupId>org.elasticsearch.client</groupId>
     <artifactId>elasticsearch-rest-high-level-client</artifactId>
     <version>7.10.0</version>
 </dependency>
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.9.9</version>
</dependency>

创建一个es client 后面的操作都是使用这个RestHighLevelClient

java 复制代码

RestHighLevelClient client = new RestHighLevelClient(
                RestClient.builder(new HttpHost("localhost", 9200, "http"))
        );

写一个简单的实体类，用于与es结构对应

java 复制代码

public class Event {
    private Long id;
    private String name;
    private String type;
    private String place;
    private String phone;
    private String mail;
    public Long getId() {
        return id;
    }
    public void setId(Long id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getType() {
        return type;
    }
    public void setType(String type) {
        this.type = type;
    }
    public String getPlace() {
        return place;
    }
    public void setPlace(String place) {
        this.place = place;
    }
    public String getPhone() {
        return phone;
    }
    public void setPhone(String phone) {
        this.phone = phone;
    }
    public String getMail() {
        return mail;
    }
    public void setMail(String mail) {
        this.mail = mail;
    }
    @Override
    public String toString() {
        return "Event{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", type='" + type + '\'' +
                ", place='" + place + '\'' +
                ", phone='" + phone + '\'' +
                ", mail='" + mail + '\'' +
                '}';
    }
}

2. 环境

本文使用 elasticsearch-7.10.0

不同的jdk版本要使用适配的es版本
最新es与jdk适配图

shell 复制代码

elasticsearch-7.10.0-windows-x86_64\elasticsearch-7.10.0\bin

下载后在bin中点击 elasticsearch.bat 启动es

默认端口是9200

3. Java操作索引

3.1 创建索引

注：以下操作以索引名为event为例

注：入参client为前面创建的RestHighLevelClient

注：MyLog.logger是我自己的log插件，可以替换使用普通sout输出

java 复制代码

private void insertDoc(RestHighLevelClient client) throws IOException {
        //插入文档
        IndexRequest indexRequest = new IndexRequest();
        indexRequest.index("event").id("1001");

        Event event = new Event();
        event.setName("赛事");
        event.setType("攻击");
        ObjectMapper mapper = new ObjectMapper();
        String jsonArr = mapper.writeValueAsString(event);
        indexRequest.source(jsonArr, XContentType.JSON);
        IndexResponse indexResponse = client.index(indexRequest, RequestOptions.DEFAULT);
        //响应状态
        MyLog.logger.info("插入文档 状态 ：" + indexResponse.getResult() + " 响应 ：" + jsonArr);
    }

3.2 查看索引

java 复制代码

private void searchIndex(RestHighLevelClient client) throws IOException {
        //查询索引
        GetIndexRequest userRequest = new GetIndexRequest("event");
        GetIndexResponse getIndexResponse = client.indices().get(userRequest, RequestOptions.DEFAULT);
        //响应状态
        Map<String, List<AliasMetadata>> aliases = getIndexResponse.getAliases();
        Map<String, MappingMetadata> mappings = getIndexResponse.getMappings();
        Map<String, Settings> settings = getIndexResponse.getSettings();
        MyLog.logger.info("查询索引 响应 ：" + aliases + mappings + settings);
    }

3.3 删除索引

java 复制代码

  private void deleteIndex(RestHighLevelClient client) throws IOException {
        //删除索引
        DeleteIndexRequest userRequest = new DeleteIndexRequest("event");
        AcknowledgedResponse response = client.indices().delete(userRequest, RequestOptions.DEFAULT);
        //响应状态
        MyLog.logger.info("删除索引 状态 ：" + response.isAcknowledged());
    }

4. java操作文档

4.1 添加文档

注：以下操作以索引名为event为例

java 复制代码

private void insertDoc(RestHighLevelClient client) throws IOException {
        //插入文档
        IndexRequest indexRequest = new IndexRequest();
        indexRequest.index("event").id("1001");

        Event event = new Event();
        event.setName("赛事");
        event.setType("攻击");

        ObjectMapper mapper = new ObjectMapper();
        String jsonArr = mapper.writeValueAsString(event);
        indexRequest.source(jsonArr, XContentType.JSON);
        IndexResponse indexResponse = client.index(indexRequest, RequestOptions.DEFAULT);
        //响应状态
        MyLog.logger.info("插入文档 状态 ：" + indexResponse.getResult() + " 响应 ：" + jsonArr);
    }

4.2 查询文档

java 复制代码

 private void getDoc(RestHighLevelClient client, String id) throws IOException {
        //查询文档
        GetRequest getRequest = new GetRequest();
        getRequest.index("event").id(id);
        GetResponse getResponse = client.get(getRequest, RequestOptions.DEFAULT);
        //响应状态
        MyLog.logger.info("查询文档 响应 ：" + getResponse.getSourceAsString());
    }

4.3 查询全部文档

java 复制代码

private void searchDoc(RestHighLevelClient client) throws IOException {
        //查询全部文档
        SearchRequest searchRequest = new SearchRequest();
        searchRequest.indices("event");
        searchRequest.source(new SearchSourceBuilder().query(QueryBuilders.matchAllQuery()));
        SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);
        //响应状态
        SearchHits hits = searchResponse.getHits();
        MyLog.logger.info("查询全部文档 响应 ：" + hits.getTotalHits());
        for (SearchHit hit : hits) {
            MyLog.logger.info("查询全部文档 数据 ：" + hit.getSourceAsString());
        }

    }

4.4 更新文档

java 复制代码

 private void updateDoc(RestHighLevelClient client) throws IOException {
        //更新文档
        UpdateRequest updateRequest = new UpdateRequest();
        updateRequest.index("event").id("1001");

        Event event = new Event();
        event.setType("防御");

        ObjectMapper mapper = new ObjectMapper();
        String jsonArr = mapper.writeValueAsString(event);
        updateRequest.doc(XContentType.JSON, "type", "防御");

        UpdateResponse updateResponse = client.update(updateRequest, RequestOptions.DEFAULT);
        //响应状态
        MyLog.logger.info("更新文档 状态 ：" + updateResponse.getResult() + " 响应 ：" + jsonArr);
    }

4.5 删除文档

java 复制代码

 private void deleteDoc(RestHighLevelClient client) throws IOException {
        //删除文档
        DeleteRequest deleteRequest = new DeleteRequest();
        deleteRequest.index("event").id("1001");
        DeleteResponse deleteResponse = client.delete(deleteRequest, RequestOptions.DEFAULT);
        //响应状态
        MyLog.logger.info("删除文档 响应 ：" + deleteResponse.toString());
    }

4.6 批量插入文档

java 复制代码

private void insertBatchDoc(RestHighLevelClient client, List<Event> events) throws IOException {
        //批量插入文档
        BulkRequest bulkRequest = new BulkRequest();
        for (Event event : events) {
            IndexRequest indexRequest = new IndexRequest()
                    .index("event").id(event.getId().toString())
                    .source(new ObjectMapper().writeValueAsString(event), XContentType.JSON);
            bulkRequest.add(indexRequest);
            //插入完成后立即强制刷新索引
            bulkRequest.setRefreshPolicy(WriteRequest.RefreshPolicy.IMMEDIATE);
        }
        BulkResponse bulkResponse = client.bulk(bulkRequest, RequestOptions.DEFAULT);
        //响应状态
        MyLog.logger.info("批量插入文档 响应 ：" + Arrays.toString(bulkResponse.getItems()));
    }

4.7 批量删除文档

java 复制代码

  private void deleteBatchDoc(RestHighLevelClient client) throws IOException {
        //批量删除文档
        BulkRequest bulkRequest = new BulkRequest();
        DeleteRequest request1 = new DeleteRequest()
                .index("event").id("1002");
        DeleteRequest request2 = new DeleteRequest()
                .index("event").id("1003");
        bulkRequest.add(request1).add(request2);
        //删除完成后立即强制刷新索引
        bulkRequest.setRefreshPolicy(WriteRequest.RefreshPolicy.IMMEDIATE);
        BulkResponse bulkResponse = client.bulk(bulkRequest, RequestOptions.DEFAULT);
        //响应状态
        MyLog.logger.info("批量删除文档 响应 ：" + Arrays.toString(bulkResponse.getItems()));
    }

4.8 条件查询文档

java 复制代码

private void searchTermDoc(RestHighLevelClient client) throws IOException {
        //查询条件文档
        SearchRequest searchRequest = new SearchRequest();
        searchRequest.indices("event");
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        //条件
        searchSourceBuilder.query(QueryBuilders.termQuery("type", "128"));
        //分页
        searchSourceBuilder.size(5);
        searchSourceBuilder.from(0);
        //排序
        searchSourceBuilder.sort("id", SortOrder.DESC);
        //管理字段
        String[] excludes = {};
        String[] includes = {"name"};
        searchSourceBuilder.fetchSource(includes, excludes);

        searchRequest.source(searchSourceBuilder);
        SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);
        //响应状态
        SearchHits hits = searchResponse.getHits();
        MyLog.logger.info("查询条件文档 响应 ：" + hits.getTotalHits());
        for (SearchHit hit : hits) {
            MyLog.logger.info("查询条件文档 数据 ：" + hit.getSourceAsString());
        }

    }

4.9 组合查询文档

java 复制代码

private void searchGroupDoc(RestHighLevelClient client) throws IOException {
        //组合查询文档
        SearchRequest searchRequest = new SearchRequest();
        searchRequest.indices("event");
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
        boolQueryBuilder.must(QueryBuilders.matchQuery("type", 13.6));
        boolQueryBuilder.must(QueryBuilders.matchQuery("name", "北京"));
        searchSourceBuilder.query(boolQueryBuilder);
        searchRequest.source(searchSourceBuilder);
        SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);
        //响应状态
        SearchHits hits = searchResponse.getHits();
        MyLog.logger.info("查询组合条件文档 响应 ：" + hits.getTotalHits());
        for (SearchHit hit : hits) {
            MyLog.logger.info("查询组合条件文档 数据 ：" + hit.getSourceAsString());
        }
    }

4.10 模糊查询文档

java 复制代码

 private void searchFuzzyDoc(RestHighLevelClient client) throws IOException {
        //模糊查询文档
        SearchRequest searchRequest = new SearchRequest();
        searchRequest.indices("event");
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        FuzzyQueryBuilder fuzzyQueryBuilder = QueryBuilders.fuzzyQuery("name", "上海").fuzziness(Fuzziness.ONE);
        //高亮
        HighlightBuilder highlightBuilder = new HighlightBuilder();
        highlightBuilder.preTags("<font color = 'red'>");
        highlightBuilder.postTags("</font>");
        highlightBuilder.field("name");
        searchSourceBuilder.highlighter(highlightBuilder);

        searchSourceBuilder.query(fuzzyQueryBuilder);
        searchRequest.source(searchSourceBuilder);
        SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);
        //响应状态
        SearchHits hits = searchResponse.getHits();
        MyLog.logger.info("模糊查询文档 响应 ：" + hits.getTotalHits());
        for (SearchHit hit : hits) {
            MyLog.logger.info("模糊查询文档 数据 ：" + hit.getSourceAsString());
        }
    }

spring boot 项目中搭建 ElasticSearch 中间件 二 Java api 操作 es

Java api 操作 es

1. 准备

2. 环境

3. Java操作索引

3.1 创建索引

3.2 查看索引

3.3 删除索引

4. java操作文档

4.1 添加文档

4.2 查询文档

4.3 查询全部文档

4.4 更新文档

4.5 删除文档

4.6 批量插入文档

4.7 批量删除文档

4.8 条件查询文档

4.9 组合查询文档

4.10 模糊查询文档

spring boot 项目中搭建 ElasticSearch 中间件二 Java api 操作 es