SpringBoot2 集成 ElasticSearch 实现搜索引擎

我就是我 2022-08-29 05:53 175阅读 0赞

# 一 简介 #

ElasticSearch是一个基于Lucene的搜索服务器。它提供了一个分布式多用户能力的全文搜索引擎，基于RESTful web接口。Elasticsearch是用Java开发的，并作为Apache许可条款下的开放源码发布，是当前流行的企业级搜索引擎。

# 二 安装 #

[Linux系统：centos7下搭建 ElasticSearch 环境。][Linux_centos7_ ElasticSearch]

# 三 与 Spring boot2 集成 #

## 3.1 pxm.xml依赖 ##

<dependency>
    		    <groupId>org.elasticsearch.client</groupId>
    		    <artifactId>elasticsearch-rest-high-level-client</artifactId>
    		    <version>6.5.4</version>
                <exclusions>
                    <exclusion>
                        <groupId>org.elasticsearch.client</groupId>
                        <artifactId>elasticsearch-rest-client</artifactId>
                    </exclusion>
                </exclusions>
    		</dependency>
    
            
            <dependency>
                <groupId>org.elasticsearch</groupId>
                <artifactId>elasticsearch</artifactId>
                <version>6.5.4</version>
            </dependency>
    
            <dependency>
                <groupId>org.elasticsearch.client</groupId>
                <artifactId>elasticsearch-rest-client</artifactId>
                <version>6.5.4</version>
            </dependency>

## 3.2 配置文件 ##

# es 配置
    spring.elasticsearch.host=172.16.20.101
    spring.elasticsearch.port=9200

## 3.3 config 配置类 ##

package com.modules.common.config;
    
    import org.apache.http.HttpHost;
    import org.elasticsearch.client.RestClient;
    import org.elasticsearch.client.RestHighLevelClient;
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    
    /**
     * elasticsearch 配置类
     *
     * @author lc
     */
    @Configuration
    public class ElasticsearchConfig {
    
        @Value(value = "${spring.elasticsearch.host}")
        private String host;
    
        @Value(value = "${spring.elasticsearch.port}")
        private int port;
    
        /**
         * 初始化
         * @return
         */
        @Bean
        public RestHighLevelClient restHighLevelClient(){
            RestHighLevelClient client = new RestHighLevelClient(
                    RestClient.builder(
    //                        new HttpHost("localhost", 9200, "http"),
                            new HttpHost(host, port, "http")));
            return client;
        }
    }

## 3.4 代码实现 ##

@Autowired
    private RestHighLevelClient client;

### 3.4.1 添加文档 ###

/**
         * 添加文档
         *
         * @throws
         * @author lc
         */
        @ApiOperation(value = "添加文档", notes = "添加文档")
        @PostMapping(value ="addIndex")
        public Result addIndex(Goods info, String indexName, String type) throws IOException {
            // IndexRequest
            IndexRequest indexRequest = new IndexRequest(indexName, type);
            String source = JSON.toJSONString(info);
            indexRequest.source(source, XContentType.JSON);
            // 操作ES
            IndexResponse indexResponse = client.index(indexRequest, RequestOptions.DEFAULT);
            return success(indexResponse);
        }

### 3.4.2 修改文档 ###

/**
         * 修改文档
         *
         * @author lc
         */
        @ApiOperation(value = "修改文档", notes = "修改文档")
        @PutMapping(value = "updateIndex")
        public Result updateIndex(Goods info, String indexName, String type) throws IOException {
            // UpdateRequest
            UpdateRequest updateRequest = new UpdateRequest(indexName, type, info.getId());
            updateRequest.doc(JSON.toJSONString(info), XContentType.JSON);
            // 操作ES
            UpdateResponse updateResponse = client.update(updateRequest, RequestOptions.DEFAULT);
            return success(updateResponse);
        }

### 3.4.3 删除文档 ###

/**
         * 删除文档
         *
         * @author lc
         */
        @ApiOperation(value = "删除文档", notes = "删除文档")
        @DeleteMapping(value = "deleteById")
        public Result deleteById(String id, String indexName, String type) throws IOException {
            // DeleteRequest
            DeleteRequest deleteRequest = new DeleteRequest(indexName,type,id);
            // 操作ES
            DeleteResponse deleteResponse = client.delete(deleteRequest, RequestOptions.DEFAULT);
            return success(deleteResponse);
        }

### 3.4.4 获取ES信息 ###

/**
         * 获取ES信息
         *
         * @throws IOException
         * @author lc
         */
        @ApiOperation(value = "获取ES信息", notes = "获取ES信息")
        @GetMapping(value = "getEsInfo")
        public Result getEsInfo() throws IOException {
            SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
            // SearchRequest
            SearchRequest searchRequest = new SearchRequest();
            searchRequest.source(searchSourceBuilder);
            // 查询ES
            SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);
            return success(searchResponse);
        }

### 3.4.5 根据ID查询 ###

/**
         * 根据ID查询
         *
         * @author lc
         */
        @ApiOperation(value = "根据ID查询", notes = "根据ID查询")
        @GetMapping(value = "getInfoById")
        public Result getInfoById(String id, String indexName, String type) throws IOException {
            // GetRequest
            GetRequest getRequest = new GetRequest(indexName, type, id);
            // 查询ES
            GetResponse getResponse = client.get(getRequest, RequestOptions.DEFAULT);
            Goods info = JSON.parseObject(getResponse.getSourceAsString(), Goods.class);
            return success(info);
        }

### 3.4.6 条件分页简单列表搜索 ###

/**
         * 简单分页条件列表搜索
         *
         * @param page
         * @param size
         * @param keyword
         * @throws
         * @author lc
         */
        @ApiOperation(value = "简单分页条件列表搜索", notes = "简单分页条件列表搜索")
        @GetMapping(value = "search")
        public Result search(@RequestParam(defaultValue = "1") Integer page,
                           @RequestParam(defaultValue = "10") Integer size,
                           String keyword) throws IOException {
            SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
            // 分页采用简单的from + size分页，适用数据量小的，了解更多分页方式可自行查阅资料
            searchSourceBuilder.from((page - 1) * size);
            searchSourceBuilder.size(size);
            //  matchQuery：会将搜索词分词，再与目标查询字段进行匹配，若分词中的任意一个词与目标字段匹配上，则可查询到。
            //  termQuery：不会对搜索词进行分词处理，而是作为一个整体与目标字段进行匹配，若完全匹配，则可查询到。
            // 查询条件，只有查询关键字不为空才带查询条件
            if (StringUtils.isNoneBlank(keyword)) {
                QueryBuilder queryBuilder = QueryBuilders.multiMatchQuery(keyword, "title");
                searchSourceBuilder.query(queryBuilder);
            }
            QueryBuilders.fuzzyQuery("","").fuzziness(Fuzziness.ONE);
            // 排序，根据ID倒叙
            // searchSourceBuilder.sort("id", SortOrder.DESC);
            // SearchRequest
            SearchRequest searchRequest = new SearchRequest("index_goods");
            searchRequest.types("_doc");
            searchRequest.source(searchSourceBuilder);
            // 查询ES
            SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);
            SearchHits hits = searchResponse.getHits();
            // 获取总数
            Long total = hits.getTotalHits();
            // 遍历封装列表对象
            List<Goods> list = new ArrayList<>();
            SearchHit[] searchHits = hits.getHits();
            for (SearchHit searchHit : searchHits) {
                list.add(JSON.parseObject(searchHit.getSourceAsString(), Goods.class));
            }
            // 封装Map参数返回
            Map<String, Object> result = new HashMap<String, Object>(16);
            result.put("total", total);
            result.put("list", list);
            return success(result);
        }

[Linux_centos7_ ElasticSearch]: https://blog.csdn.net/lovelichao12/article/details/103755503