Java--druidAPI查询

maven依赖
<dependency>
   <groupId>in.zapr.druid</groupId>
   <artifactId>druidry</artifactId>
   <version>2.1</version>
</dependency>

1 组装json

//时间范围：Interval

DateTime start = new DateTime(DateUtils.getToday()+"T00:00:00.000+08:00");
DateTime end = new DateTime();
Interval interval = new Interval(start,end);
// 粒度
Granularity granularity = new SimpleGranularity(PredefinedGranularity.ALL);
// 过滤
DruidFilter todayUvEventFilter = new SelectorFilter("event","3001");
DruidFilter todayUvPageIdFilter = new SelectorFilter("page_id","101");
// and过滤
DruidFilter todayUvFilters = new AndFilter(Arrays.asList(todayUvEventFilter,todayUvPageIdFilter));
// HyperUnique 聚合
DruidAggregator todayUvAggregator = new HyperUniqueAggregator("today_uv","user_id");
// Filteres聚合
DruidAggregator todayUvAggregators = new FilteredAggregator(todayUvFilters,todayUvAggregator);

DruidFilter articleUvEventFilter = new SelectorFilter("event","3001");
DruidFilter articleUvPageIdFilter = new SelectorFilter("page_id","102");
DruidFilter articleUvFilters = new AndFilter(Arrays.asList(articleUvEventFilter,articleUvPageIdFilter));
DruidAggregator articleUvAggregator = new HyperUniqueAggregator("article_uv","user_id");
DruidAggregator articleUvAggregators = new FilteredAggregator(articleUvFilters,articleUvAggregator);

DruidFilter ypsUvEventFilter = new SelectorFilter("event","3001");
DruidFilter ypsUvPageIdFilter = new SelectorFilter("page_id","201");
DruidFilter ypsUvFilters = new AndFilter(Arrays.asList(ypsUvEventFilter,ypsUvPageIdFilter));
DruidAggregator ypsUvAggregator = new HyperUniqueAggregator("yps_uv","user_id");
DruidAggregator ypsUvAggregators = new FilteredAggregator(ypsUvFilters,ypsUvAggregator);

DruidFilter messageUvButtonIdFilter = new SelectorFilter("button_id","10102");
DruidFilter messageUvFilters = new AndFilter(Arrays.asList(messageUvButtonIdFilter));
DruidAggregator messageUvAggregator = new HyperUniqueAggregator("message_uv","user_id");
DruidAggregator messageUvAggregators = new FilteredAggregator(messageUvFilters,messageUvAggregator);

// PostAggregator
DruidPostAggregator articleUvArticleField = new HyperUniqueCardinalityPostAggregator("article_uv","article_uv");
DruidPostAggregator todayUvArticleField = new HyperUniqueCardinalityPostAggregator("today_uv","today_uv");
DruidPostAggregator articleRatePostAgg = ArithmeticPostAggregator.builder().name("article_rate").function(ArithmeticFunction.DIVIDE).fields(Arrays.asList(articleUvArticleField,todayUvArticleField)).build();

DruidPostAggregator ypsUvYpsField = new HyperUniqueCardinalityPostAggregator("yps_uv","yps_uv");
DruidPostAggregator todayUvYpsField = new HyperUniqueCardinalityPostAggregator("today_uv","today_uv");
DruidPostAggregator ypsRatePostAgg = ArithmeticPostAggregator.builder().name("yps_rate").function(ArithmeticFunction.DIVIDE).fields(Arrays.asList(ypsUvYpsField,todayUvYpsField)).build();

DruidPostAggregator messageUvMessageField = new HyperUniqueCardinalityPostAggregator("message_uv","message_uv");
DruidPostAggregator todayUvMessageField = new HyperUniqueCardinalityPostAggregator("today_uv","today_uv");
DruidPostAggregator messageRatePostAgg = ArithmeticPostAggregator.builder().name("message_rate").function(ArithmeticFunction.DIVIDE).fields(Arrays.asList(messageUvMessageField,todayUvMessageField)).build();

//组装DruidQuery
DruidTimeSeriesQuery query = DruidTimeSeriesQuery.builder()
                    .dataSource(druidProperties.getDataSourceOpenPlatform())
                    .granularity(granularity)
                    .intervals(Collections.singletonList(interval))
                    .aggregators(Arrays.asList(todayUvAggregators,articleUvAggregators,ypsUvAggregators,messageUvAggregators))
                    .postAggregators(Arrays.asList(articleRatePostAgg,ypsRatePostAgg,messageRatePostAgg))
                    .build();

2 查询
public List<HashMap>  queryResult( DruidQuery query) throws ConnectionException, JsonProcessingException, QueryException {
    ObjectMapper mapper = new ObjectMapper();
    String requiredJson = mapper.writeValueAsString(query);
    log.info(requiredJson);
    DruidClient client = dataSourceDruidConfig.druidClient();
    client.connect();
    List<HashMap> responses = client.query(query, HashMap.class);
    client.close();
    return responses;
}

3 分析并组装结果

try {
    List<HashMap> res = queryResult(query);
    if(res!=null){
        DecimalFormat df = new DecimalFormat("0.00%");
        for (HashMap hashMap : res){
            Map<String,Object> event = (Map<String,Object>)hashMap.get("result");
　　　　　　　　//小数-》百分比
            String yps_rate = String.valueOf(event.get("yps_rate"));
            entiretUvRateParam.setYps_rate(df.format(Double.parseDouble(yps_rate)));
        }
    }
} catch (ConnectionException e) {
    e.printStackTrace();
    return null;
} catch (QueryException e) {
    e.printStackTrace();
    return null;
} catch (JsonProcessingException e) {
    e.printStackTrace();
    return null;
} catch (Exception e) {
    e.printStackTrace();
    return null;
}