ES查詢 Java RestHighLevelClient API方法

matchQuery multiMatchQuery BoolQuery filter過濾器 sort排序高亮

took：本次操作花費的時間，單位爲毫秒。 timed_out：請求是否超時 _shards：說明本次操作共搜索了哪些分片
hits：搜索命中的記錄 hits.total ：符合條件的文檔總數 hits.hits ：匹配度較高的前N個文檔
hits.max_score：文檔匹配得分，這裏爲最高分 _score：每個文檔都有一個匹配度得分，按照降序排列。
_source：顯示了文檔的原始內容。

測試環境準備

1.創建xc_course 索引庫 2.創建映射配置 3.插入三條文檔

@SpringBootTest
@RunWith(SpringRunner.class)
public class TestSearch {
    @Autowired
    RestHighLevelClient client;
    @Autowired
    RestClient restClient;
}

查詢所有文檔

1.構建 searchRequest 搜索請求對象 2.設置請求對象的搜索對象的類型

3.構建搜索源對象searchSourceBuilder 4.設置搜索源對象的搜索方式 5.設置搜索源對象的過濾條件

6.向搜索請求對象中設置搜索源對象 7.執行搜索,獲得搜索結果對象searchResponse

8.獲得搜索結果數組 SearchHits [ ]

     @Test
    public void testSearchAll() throws Exception {
        //構建搜索請求對象
        SearchRequest searchRequest = new SearchRequest("xc_course");
        //設置搜索對象的類型
        searchRequest.types("doc");
        //構建搜索源對象
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        //搜索源搜索方式
        searchSourceBuilder.query(QueryBuilders.matchAllQuery());
        //過濾條件 第一個要顯示的字段,第二個不顯示的
        searchSourceBuilder.fetchSource(new String[]{"name","studymodel","price","timestamp"},new String[]{});
        //向搜索請求對象中設置搜索源
        searchRequest.source(searchSourceBuilder);
        //執行搜索,向ES發起Http請求,獲得結果對象
        SearchResponse searchResponse = client.search(searchRequest);
        //搜索結果
        SearchHits hits = searchResponse.getHits();
        //獲得匹配總記錄
        long totalHits = hits.getTotalHits();
        //得到匹配度高的文檔
        SearchHit[] searchHits = hits.getHits();
        //日期格式化對象
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        for(SearchHit hit:searchHits){
            //文檔的主鍵
            String id = hit.getId();
            //源文檔內容
            Map<String, Object> sourceAsMap = hit.getSourceAsMap();
            String name = (String) sourceAsMap.get("name");
            //由於前邊設置了源文檔字段過慮，這時description是取不到的
            String description = (String) sourceAsMap.get("description");
            //學習模式
            String studymodel = (String) sourceAsMap.get("studymodel");
            //價格
            Double price = (Double) sourceAsMap.get("price");
            //日期
            Date timestamp = dateFormat.parse((String) sourceAsMap.get("timestamp"));
            System.out.println(name);
            System.out.println(studymodel);
            System.out.println(description);
        }

    }

分頁查詢

只用在構建搜索源對象後設置參數即可

        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        int page = 1;
        //每頁記錄數
        int size = 1;
        //計算出記錄起始下標
        int from  = (page-1)*size;
        searchSourceBuilder.from(from);//起始記錄下標，從0開始
        searchSourceBuilder.size(size);//每頁顯示的記錄數
        //搜索源搜索方式
        searchSourceBuilder.query(QueryBuilders.matchAllQuery());

關鍵字查詢

設置搜索源對象的查詢方式爲 termQuery("name","Spring") 表示查詢字段爲name的關鍵字爲Spring

        searchSourceBuilder.query(QueryBuilders.termQuery("name","spring"));
        //設置源字段過慮,第一個參數結果集包括哪些字段，第二個參數表示結果集不包括哪些字段
        searchSourceBuilder.fetchSource(new String[]{"name","studymodel","price","timestamp"},new String[]{});
        //向搜索請求對象中設置搜索源
        searchRequest.source(searchSourceBuilder);
        //執行搜索,向ES發起http請求
        SearchResponse searchResponse = client.search(searchRequest);
        //搜索結果
        SearchHits hits = searchResponse.getHits();
        //匹配到的總記錄數
        long totalHits = hits.getTotalHits();
        //得到匹配度高的文檔
        SearchHit[] searchHits = hits.getHits();

根據id查詢

可以根據多個id查詢所以searchSourceBuilder.query(QueryBuilders.termsQuery("_id",ids)); 中傳入一個數組

        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        //搜索方式  根據id查詢
        String[] ids = new String[]{"1","2"};
        searchSourceBuilder.query(QueryBuilders.termsQuery("_id",ids));
        //設置源字段過慮,第一個參數結果集包括哪些字段，第二個參數表示結果集不包括哪些字段
        searchSourceBuilder.fetchSource(new String[]{"name","studymodel","price","timestamp"},new String[]{});
        //向搜索請求對象中設置搜索源
        searchRequest.source(searchSourceBuilder);

matchQuery

匹配查詢匹配字段 description 搜索關鍵字 spring 開發框架會被分詞爲三個

minimumShouldMatch 爲匹配度 0.8*3 =2.4 向下取整 2 所以在 description字段中只要有兩個詞就算匹配成功

QueryBuilders.matchQuery("description","spring開發框架").minimumShouldMatch("80%"))

        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        //搜索方式MatchQuery
        searchSourceBuilder.query(QueryBuilders.matchQuery("description","spring開發框架")
                .minimumShouldMatch("80%"));
        //設置源字段過慮,第一個參數結果集包括哪些字段，第二個參數表示結果集不包括哪些字段
        searchSourceBuilder.fetchSource(new String[]{"name","studymodel","price","timestamp"},new String[]{});
        //向搜索請求對象中設置搜索源
        searchRequest.source(searchSourceBuilder);

multiMatchQuery

匹配搜索多個字段

QueryBuilders.multiMatchQuery("spring css","name","description") .minimumShouldMatch("50%") .field("name",10)

設置搜索方式時,使用multiMatchQuery 第一個參數: 搜索的關鍵字第二個參數可以爲多個: 要搜索的字段(filed)

使用minimumShouldMatch 設置匹配度這裏是只要有一個詞就算

field 提升name 字段的得分權限每個結果搜索出來後都會有一個得分這裏設置name屬性提升10倍的得分

        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        //搜索方式
        //MultiMatchQuery
        searchSourceBuilder.query(QueryBuilders.multiMatchQuery("spring css","name","description")
                .minimumShouldMatch("50%")
                .field("name",10));
        //設置源字段過慮,第一個參數結果集包括哪些字段，第二個參數表示結果集不包括哪些字段
        searchSourceBuilder.fetchSource(new String[]{"name","studymodel","price","timestamp"},new String[]{});
        //向搜索請求對象中設置搜索源
        searchRequest.source(searchSourceBuilder);

BoolQuery

用於組合查詢上述的查詢方式

1.定義一個 MultiMatchQueryBuilder 2.定一個 TermQueryBuilder 3.定一個BoolQueryBuilder

4.使用 BoolQueryBuilder 將他們組合起來

boolQueryBuilder.must(multiMatchQueryBuilder); boolQueryBuilder.must(termQueryBuilder);

5.將 BoolQueryBuilder 放入searchSourceBuilder() 設置查詢方式

    @Test
    public void testBoolQuery() throws IOException, ParseException {
        //搜索請求對象
        SearchRequest searchRequest = new SearchRequest("xc_course");
        //指定類型
        searchRequest.types("doc");
        //搜索源構建對象
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();

        //boolQuery搜索方式
        //先定義一個MultiMatchQuery
        MultiMatchQueryBuilder multiMatchQueryBuilder = QueryBuilders.multiMatchQuery("spring css", "name", "description")
                .minimumShouldMatch("50%")
                .field("name", 10);
        //再定義一個termQuery
        TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("studymodel", "201001");

        //定義一個boolQuery
        BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
        boolQueryBuilder.must(multiMatchQueryBuilder);
        boolQueryBuilder.must(termQueryBuilder);

        searchSourceBuilder.query(boolQueryBuilder);
    }

filter過濾器

BoolQueryBuilder 不僅可以組合普通的查詢還可以組合過濾器 性能更高對查詢出來的結果進行過濾

boolQueryBuilder.filter(QueryBuilders.termQuery("studymodel","201001")); 表示只需要 studymodel字段爲 201001的
boolQueryBuilder.filter(QueryBuilders.rangeQuery("price").gte(90).lte(100)); 表示過濾價格大於等於90 小於等於100的

        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        //boolQuery搜索方式  先定義一個MultiMatchQuery
        MultiMatchQueryBuilder multiMatchQueryBuilder = QueryBuilders.multiMatchQuery("spring css", "name", "description")
                .minimumShouldMatch("50%")
                .field("name", 10);

        //定義一個boolQuery
        BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
        boolQueryBuilder.must(multiMatchQueryBuilder);
        //定義過慮器
        boolQueryBuilder.filter(QueryBuilders.termQuery("studymodel","201001"));
        boolQueryBuilder.filter(QueryBuilders.rangeQuery("price").gte(90).lte(100));

        searchSourceBuilder.query(boolQueryBuilder);

sort排序

對查詢後結果進行排序, searchSourceBuilder 使用

searchSourceBuilder.sort("studymodel", SortOrder.DESC);
searchSourceBuilder.sort("price", SortOrder.ASC);

        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        //boolQuery搜索方式
        //定義一個boolQuery
        BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
        //定義過慮器
        boolQueryBuilder.filter(QueryBuilders.rangeQuery("price").gte(0).lte(100));

        searchSourceBuilder.query(boolQueryBuilder);
        //添加排序
        searchSourceBuilder.sort("studymodel", SortOrder.DESC);
        searchSourceBuilder.sort("price", SortOrder.ASC);

高亮

1. 定義高亮對象 HighlightBuilder( )

2.在關鍵字前,後設置標籤 highlightBuilder.preTags("<span style="color="red">"); highlightBuilder.postTags("<span style="color="red">");

3.設置需要高亮的字段 highlightBuilder.fields().add(new HighlightBuilder.Field("name"));

4.設置源數據高亮 searchSourceBuilder.highlighter(highlightBuilder);

        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        //boolQuery搜索方式先定義一個MultiMatchQuery
        MultiMatchQueryBuilder multiMatchQueryBuilder = QueryBuilders.multiMatchQuery("開發框架", "name", "description")
                .minimumShouldMatch("50%")
                .field("name", 10);

        //定義一個boolQuery
        BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
        boolQueryBuilder.must(multiMatchQueryBuilder);
        //定義過慮器
        boolQueryBuilder.filter(QueryBuilders.rangeQuery("price").gte(0).lte(100));

        searchSourceBuilder.query(boolQueryBuilder);
        //設置源字段過慮,第一個參數結果集包括哪些字段，第二個參數表示結果集不包括哪些字段
        searchSourceBuilder.fetchSource(new String[]{"name","studymodel","price","timestamp"},new String[]{});

        //設置高亮
        HighlightBuilder highlightBuilder = new HighlightBuilder();
        highlightBuilder.preTags("<tag>");
        highlightBuilder.postTags("</tag>");
        highlightBuilder.fields().add(new HighlightBuilder.Field("name"));
//        highlightBuilder.fields().add(new HighlightBuilder.Field("description"));
        searchSourceBuilder.highlighter(highlightBuilder);

        //向搜索請求對象中設置搜索源
        searchRequest.source(searchSourceBuilder);
        //執行搜索,向ES發起http請求
        SearchResponse searchResponse = client.search(searchRequest);

綜合結構圖

{ 
 
"_source" : [ "name", "studymodel", "description","price"], 
   "query": { 
 "bool" : { 
     "must":[  
         { 
    
        "multi_match" : { 
             
    "query" : "開發框架", 
                 
    "minimum_should_match": "50%", 
             
    "fields": [ "name^10", "description" ], 
             
    "type":"best_fields" 
    } 
    } 
             ], 
 
    "filter": [  
         
    { "range": { "price": { "gte": 0 ,"lte" : 100}}}  
        ]   
 } 
    }, 
   "sort" : [ 
        { 
        "price" : "asc" 
          } 
            ], 

"highlight": { 
    "pre_tags": ["<tag1>"], 
    "post_tags": ["</tag2>"],  
    "fields": { 
      "name": {}, 
      "description":{} 
    } 
  } 
}

ES查詢 Java RestHighLevelClient API方法

測試環境準備

查詢所有文檔

分頁查詢

關鍵字查詢

根據id查詢

matchQuery

multiMatchQuery

BoolQuery

filter過濾器

sort排序

高亮

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