ES使用

ElasticaSearch

导包

   <dependency>
             <groupId>org.elasticsearch</groupId>
             <artifactId>elasticsearch</artifactId>
             <version>6.2.1</version>
         </dependency>
         <dependency>
             <groupId>org.elasticsearch.client</groupId>
             <artifactId>elasticsearch-rest-high-level-client</artifactId>
             <version>6.2.1</version>
         </dependency>

配置

  @Bean
     public RestHighLevelClient client(){
         RestHighLevelClient client = new RestHighLevelClient(RestClient.builder(
                 new HttpHost("localhost", 9200, "http")));
         return client;
     }

使用

创建索引表

 //创建建库索引对象
 CreateIndexRequest createIndexRequest = new CreateIndexRequest();
         //索引库名 相当于数据库表名
         createIndexRequest.index("cyt");
 //设置分片和副本       createIndexRequest.settings(Settings.builder().put("number_of_shards",1).put("number_of_replicas",0));
        //创建映射 相当于数据库字段
        createIndexRequest.mapping()
   //使用高版本客户端对象
   IndicesClient indices = client.indices();
   //创建
  CreateIndexResponse createIndexResponse = indices.create(createIndexRequest);
  //输出响应结果
  System.out.println(createIndexResponse.isAcknowledged());

删除索引表

 //创建删库索引对象
 DeleteIndexRequest deleteIndexRequest = new DeleteIndexRequest();
         //索引库名
         deleteIndexRequest.indices("cyt");
          //使用高版本客户端对象
         IndicesClient indices = client.indices();
         //删除
         DeleteIndexResponse delete = indices.delete(deleteIndexRequest);
         //输出结果集
         System.out.println(delete.isAcknowledged());

添加数据

 //创建添加对象
 IndexRequest indexRequest = new IndexRequest();
         //添加的索引库
          indexRequest.index("cyt");
         //类型
         indexRequest.type("doc");
         //id
         indexRequest.id("1");
         //map中存数据
         HashMap map = new HashMap();
         map.put("username","陈云天");
         map.put("age",18);
         map.put("price",9999.99);
         map.put("phone",10001);
         map.put("pic","http://1.png");
         //存入
          IndexRequest source = indexRequest.source(map);
          //使用高版本客户端存入
          IndexResponse index = client.index(indexRequest);
          //打印结果集
          System.out.println(index.getResult());

修改数据

 //创建修改对象并给入表名、类型、id
 UpdateRequest updateRequest = new UpdateRequest("ggg","doc","7");
         //使用map修改值
         HashMap map = new HashMap();
         map.put("username","赵小七");
         //修改
         updateRequest.doc(map);
          //使用高版本客户端修改
  UpdateResponse update = client.update(updateRequest);
         //打印结果集
         System.out.println(update.getResult());

删除数据

 //创建删除对象
 DeleteRequest deleteRequest = new DeleteRequest();
         //表名
         deleteRequest.index("ggg");
         //id
         deleteRequest.id("6");
         //类型
         deleteRequest.type("doc");
          //使用高版本客户端修改
         DeleteResponse delete = client.delete(deleteRequest);
         //打印结果集
         System.out.println(delete.getResult());

查询数据

  //创建查询对象
  GetRequest getRequest = new GetRequest();
         //表名
         getRequest.index("gzs");
         //类型
         getRequest.type("doc");
         //id
         getRequest.id("kkwZlIABKcpxytiOyzVV");
         //使用高版本客户端查询
         GetResponse documentFields = client.get(getRequest);
         //打印结果集
         System.out.println(documentFields.getSourceAsMap());

搜索7种

 @Test
    public void testSearch() throws IOException {
    	//起始页数
        Integer page = 1;
        //每页条数
        Integer size = 3;
        //搜索请求对象
        SearchRequest searchRequest = new SearchRequest();
        //搜索表名
        searchRequest.indices("food");
        //搜索表类型
        searchRequest.types("doc");
        //搜索源对象构建
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        //1.matchAllQuery 查所有
//        searchSourceBuilder.query(QueryBuilders.matchAllQuery());
        //2.termQuery 根据字段不分词查询
//        searchSourceBuilder.query(QueryBuilders.termQuery("username","张"));
        //3.termsQuery 根据多个字段不分词查询
//        searchSourceBuilder.query(QueryBuilders.termsQuery("username","1","老李"));
        //4.matchQuery 根据字段分词查询
//        searchSourceBuilder.query(QueryBuilders.matchQuery("username","张"));
        //5.multiQuery 多字段分词查询
//            searchSourceBuilder.query(QueryBuilders.multiMatchQuery("南窑头汉堡臭豆腐","name","address").field("name",10));
        //6.RangeQuery 范围查询+排序
//            searchSourceBuilder.query(QueryBuilders.rangeQuery("price").gte(10).lte(50));
//            searchSourceBuilder.sort("price", SortOrder.DESC);
        //7.boolQuery组合查询
        TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("name", "臭豆腐");
        RangeQueryBuilder rangeQueryBuilder = QueryBuilders.rangeQuery("price").gte(10).lte(50);
        BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
        boolQueryBuilder.must(termQueryBuilder);
        boolQueryBuilder.must(rangeQueryBuilder);
        searchSourceBuilder.query(boolQueryBuilder);
      
      
      	
      	//高亮设置
        HighlightBuilder highlightBuilder = new HighlightBuilder();
        //前缀
        highlightBuilder.preTags("<font style='color:red'>");
        highlightBuilder.postTags("</font>");
        highlightBuilder.field("name");
        searchSourceBuilder.highlighter(highlightBuilder);
       
       
       //分页
        //起始下标
        searchSourceBuilder.from((page-1)*size);
        //每页条数
        searchSourceBuilder.size(size);
        //设置搜索源
        searchRequest.source(searchSourceBuilder);
        //执行搜索
        SearchResponse search = client.search(searchRequest);
        //结果集
        SearchHits hits = search.getHits();
        //查询总数
        long totalHits = hits.getTotalHits();
        float score1 = hits.getMaxScore();
        System.out.println(totalHits);
        System.out.println(score1);
          SearchHit[] hits1 = hits.getHits();
        for (SearchHit hit : hits1) {
            Map<String, Object> sourceAsMap = hit.getSourceAsMap();
            String username = (String) sourceAsMap.get("name");
            //取出高亮字段
            Map<String, HighlightField> highlightFields = hit.getHighlightFields();
            if(!highlightFields.isEmpty()){
                //取出高亮
                HighlightField name = highlightFields.get("name");
                if(name!=null){
                    StringBuffer stringBuffer = new StringBuffer();
                    for (Text fragment : name.fragments()) {
                        stringBuffer.append(fragment);
                    }
                username = stringBuffer.toString();
                }
            }
            String id = hit.getId();


            Object address = sourceAsMap.get("address");
            Object price = sourceAsMap.get("price");
            float score = hit.getScore();
            System.out.println(id);
            System.out.println(username);
            System.out.println(address.toString());
            System.out.println(score);
            System.out.println(price);

        }


    }