Jest操作

ゝ一纸荒年。 2022-04-12 13:57 177阅读 0赞

## 官方操作文档（很全） [Jest/jest at master · searchbox-io/Jest · GitHub][Jest_jest at master _ searchbox-io_Jest _ GitHub] ##

![SouthEast][]

### 1.创建index ###

//创建实体类，并赋值
    School school = new School();
    school.setId(4);
    school.setName("杨旭");
    school.setAddress("江苏南京");
    school.setAge(23);
    school.setDate("1994-04-12");
    
    //构建一个索引功能,type为student
    Index index = new Index.Builder(school).index("jest").type("student").build();
    try {
        jestClient.execute(index);
        System.out.println("数据索引成功！");
    } catch (IOException e) {
        e.printStackTrace();
    }

### 2.检索ES ###

#### 2.1最简单的模式，进行检索ES ####

@Autowired
    JestClient jestClient;
    
    String json = "{\n" +
                    " \"query\" : {\n" +
                    " \"match\" : {\n" +
                    " \"name\" : \"杨\"\n" +
                    " }\n" +
                    " }\n" +
                    "}";
    
    try{ 
         //构建搜索功能
         SearchResult result = jestClient.execute(
                        new Search.Builder(json).addIndex("school").addType("student").build());
         System.out.println(result.getJsonString());
         }
        catch (Exception e){ 
    }

#### 2.2 SearchSourceBuilder进行检索ES ####

@Autowired
    JestClient jestClient;
    
    SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
    QueryBuilder queryBuilder = QueryBuilders.wildcardQuery("name", "杨*");//通配符和正则表达式查询
    searchSourceBuilder.query(queryBuilder);
    searchSourceBuilder.size(10);
    searchSourceBuilder.from(0);
    String query = searchSourceBuilder.toString();
    System.out.println(query);
    
    try{ 
        //构建搜索功能
        SearchResult result = jestClient.execute(
               new Search.Builder(query).addIndex("school").addType("student").build());
        System.out.println(result.getJsonString());
    }
       catch (Exception e){ 
    }

## 3.AggregationBuilders,分类参考官方文档[Aggregations | Elasticsearch Reference \[5.6\] | Elastic][Aggregations _ Elasticsearch Reference _5.6_ _ Elastic] ##

1.聚合分析（通过间隔为1划分年龄段）
    
    HistogramAggregationBuilder histogramAggregationBuilder = AggregationBuilders.histogram("his_age")
                                                                                         .field("age")
                                                                                         .interval(1);
    searchSourceBuilder.aggregation(histogramAggregationBuilder);
    String aggregationQuery = searchSourceBuilder.toString();
    System.out.println("聚合语句"+aggregationQuery);
    try{ 
       //构建搜索功能
       SearchResult result = jestClient.execute(
                        new Search.Builder(aggregationQuery).addIndex("school").addType("student").build());
       System.out.println(result.getJsonString());
    }
    catch (Exception e){ 
       e.printStackTrace();
    }
    2.平均值
    
    AbstractAggregationBuilder abstractAggregationBuilder = null;
    abstractAggregationBuilder = AggregationBuilders.avg("avg_age").field("age");
    searchSourceBuilder.aggregation(abstractAggregationBuilder);
    String aggregationQuery = searchSourceBuilder.toString();
    System.out.println("平均值查询语句"+"\n"+aggregationQuery);
    try{ 
       //构建搜索功能
       SearchResult result = jestClient.execute(
                        new Search.Builder(aggregationQuery).addIndex("school").addType("student").build());
       System.out.println(result.getJsonString());
       }
    catch (Exception e){ 
        e.printStackTrace();
    }
    
    以下用法同2
    3.AggregationBuilders.sum 
    4.AggregationBuilders.count
    5.AggregationBuilders.max
    6.AggregationBuilders.min
    7.AggregationBuilders.cardinality 基于文档的某个值，计算文档非重复的个数（去重计数）

[Jest_jest at master _ searchbox-io_Jest _ GitHub]: https://github.com/searchbox-io/Jest/tree/master/jest
[SouthEast]: /images/20220412/da415ecc8b6242708c118b07049ca278.png
[Aggregations _ Elasticsearch Reference _5.6_ _ Elastic]: https://www.elastic.co/guide/en/elasticsearch/reference/5.6/search-aggregations.html