springboot整合es客户端操作elasticsearch（五）

springboot整合es客户端操作elasticsearch的总结：

客户端可以进行可以对所有文档进行查询，就是不加任何条件：

   SearchRequest searchRequest = new SearchRequest("cxy");
        //指定类型
        searchRequest.types("doc");
        //搜索源构建对象
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        //搜索方式
        //matchAllQuery搜索全部
        searchSourceBuilder.query(QueryBuilders.matchAllQuery());
        //设置源字段过虑,第一个参数结果集包括哪些字段，第二个参数表示结果集不包括哪些字段
        searchSourceBuilder.fetchSource(new String[]{"name","studymodel","price","timestamp"},new String[]{});
        //向搜索请求对象中设置搜索源
        searchRequest.source(searchSourceBuilder);
        //执行搜索,向ES发起http请求
        SearchResponse searchResponse = client.search(searchRequest);
        //搜索结果
        SearchHits hits = searchResponse.getHits();
        //匹配到的总记录数
        long totalHits = hits.getTotalHits();
        //得到匹配度高的文档
        SearchHit[] searchHits = hits.getHits();

可以进行分页查询：

 SearchRequest searchRequest = new SearchRequest("cxy");
        //指定类型
        searchRequest.types("doc");
        //搜索源构建对象
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        //设置分页参数
        //页码
        int page = ;
        //每页记录数
        int size = ;
        //计算出记录起始下标
        int from  = (page-)*size;
        searchSourceBuilder.from(from);//起始记录下标，从0开始
        searchSourceBuilder.size(size);//每页显示的记录数
        //搜索方式
        //matchAllQuery搜索全部
        searchSourceBuilder.query(QueryBuilders.matchAllQuery());
        //设置源字段过虑,第一个参数结果集包括哪些字段，第二个参数表示结果集不包括哪些字段
        searchSourceBuilder.fetchSource(new String[]{"name","studymodel","price","timestamp"},new String[]{});
        //向搜索请求对象中设置搜索源
        searchRequest.source(searchSourceBuilder);
        //执行搜索,向ES发起http请求
        SearchResponse searchResponse = client.search(searchRequest);
        //搜索结果
        SearchHits hits = searchResponse.getHits();
        //匹配到的总记录数
        long totalHits = hits.getTotalHits();
        //得到匹配度高的文档
        SearchHit[] searchHits = hits.getHits();

可以进行精确查询：

  SearchRequest searchRequest = new SearchRequest("cxy");
        //指定类型
        searchRequest.types("doc");
        //搜索源构建对象
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        //设置分页参数
        //页码
        int page = ;
        //每页记录数
        int size = ;
        //计算出记录起始下标
        int from  = (page-)*size;
        searchSourceBuilder.from(from);//起始记录下标，从0开始
        searchSourceBuilder.size(size);//每页显示的记录数
        //搜索方式
        //termQuery
        searchSourceBuilder.query(QueryBuilders.termQuery("name","spring"));
        //设置源字段过虑,第一个参数结果集包括哪些字段，第二个参数表示结果集不包括哪些字段
        searchSourceBuilder.fetchSource(new String[]{"name","studymodel","price","timestamp"},new String[]{});
        //向搜索请求对象中设置搜索源
        searchRequest.source(searchSourceBuilder);
        //执行搜索,向ES发起http请求
        SearchResponse searchResponse = client.search(searchRequest);
        //搜索结果
        SearchHits hits = searchResponse.getHits();
        //匹配到的总记录数
        long totalHits = hits.getTotalHits();
        //得到匹配度高的文档
        SearchHit[] searchHits = hits.getHits();

可以根据id进行精确查询

 SearchRequest searchRequest = new SearchRequest("cxy");
        //指定类型
        searchRequest.types("doc");
        //搜索源构建对象
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        //搜索方式
        //根据id查询
        //定义id
        String[] ids = new String[]{"",""};
        searchSourceBuilder.query(QueryBuilders.termsQuery("_id",ids));
        //设置源字段过虑,第一个参数结果集包括哪些字段，第二个参数表示结果集不包括哪些字段
        searchSourceBuilder.fetchSource(new String[]{"name","studymodel","price","timestamp"},new String[]{});
        //向搜索请求对象中设置搜索源
        searchRequest.source(searchSourceBuilder);
        //执行搜索,向ES发起http请求
        SearchResponse searchResponse = client.search(searchRequest);
        //搜索结果
        SearchHits hits = searchResponse.getHits();
        //匹配到的总记录数
        long totalHits = hits.getTotalHits();
        //得到匹配度高的文档
        SearchHit[] searchHits = hits.getHits();

也可以进行多字段匹配差选：

//搜索请求对象
        SearchRequest searchRequest = new SearchRequest("cxy");
        //指定类型
        searchRequest.types("doc");
        //搜索源构建对象
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();

        //搜索方式
        //MultiMatchQuery
        searchSourceBuilder.query(QueryBuilders.multiMatchQuery("spring css","name","description")
                .minimumShouldMatch("50%")
                .field("name",));
        //设置源字段过虑,第一个参数结果集包括哪些字段，第二个参数表示结果集不包括哪些字段
        searchSourceBuilder.fetchSource(new String[]{"name","studymodel","price","timestamp"},new String[]{});
        //向搜索请求对象中设置搜索源
        searchRequest.source(searchSourceBuilder);
        //执行搜索,向ES发起http请求
        SearchResponse searchResponse = client.search(searchRequest);
        //搜索结果
        SearchHits hits = searchResponse.getHits();
        //匹配到的总记录数
        long totalHits = hits.getTotalHits();
        //得到匹配度高的文档
        SearchHit[] searchHits = hits.getHits();

也可以添加Boolean要求：

  SearchRequest searchRequest = new SearchRequest("cxy");
        //指定类型
        searchRequest.types("doc");
        //搜索源构建对象
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();

        //boolQuery搜索方式
        //先定义一个MultiMatchQuery
        MultiMatchQueryBuilder multiMatchQueryBuilder = QueryBuilders.multiMatchQuery("spring css", "name", "description")
                .minimumShouldMatch("50%")
                .field("name", );
        //再定义一个termQuery
        TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("studymodel", "");

        //定义一个boolQuery
        BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
        boolQueryBuilder.must(multiMatchQueryBuilder);
        boolQueryBuilder.must(termQueryBuilder);

        searchSourceBuilder.query(boolQueryBuilder);
        //设置源字段过虑,第一个参数结果集包括哪些字段，第二个参数表示结果集不包括哪些字段
        searchSourceBuilder.fetchSource(new String[]{"name","studymodel","price","timestamp"},new String[]{});
        //向搜索请求对象中设置搜索源
        searchRequest.source(searchSourceBuilder);
        //执行搜索,向ES发起http请求
        SearchResponse searchResponse = client.search(searchRequest);
        //搜索结果
        SearchHits hits = searchResponse.getHits();
        //匹配到的总记录数
        long totalHits = hits.getTotalHits();
        //得到匹配度高的文档
        SearchHit[] searchHits = hits.getHits();

也可以添加过滤器：

  SearchRequest searchRequest = new SearchRequest("cxy");
        //指定类型
        searchRequest.types("doc");
        //搜索源构建对象
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();

        //boolQuery搜索方式
        //先定义一个MultiMatchQuery
        MultiMatchQueryBuilder multiMatchQueryBuilder = QueryBuilders.multiMatchQuery("spring css", "name", "description")
                .minimumShouldMatch("50%")
                .field("name", );

        //定义一个boolQuery
        BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
        boolQueryBuilder.must(multiMatchQueryBuilder);
        //定义过虑器
        boolQueryBuilder.filter(QueryBuilders.termQuery("studymodel",""));
        boolQueryBuilder.filter(QueryBuilders.rangeQuery("price").gte().lte());

        searchSourceBuilder.query(boolQueryBuilder);
        //设置源字段过虑,第一个参数结果集包括哪些字段，第二个参数表示结果集不包括哪些字段
        searchSourceBuilder.fetchSource(new String[]{"name","studymodel","price","timestamp"},new String[]{});
        //向搜索请求对象中设置搜索源
        searchRequest.source(searchSourceBuilder);
        //执行搜索,向ES发起http请求
        SearchResponse searchResponse = client.search(searchRequest);
        //搜索结果
        SearchHits hits = searchResponse.getHits();
        //匹配到的总记录数
        long totalHits = hits.getTotalHits();
        //得到匹配度高的文档
        SearchHit[] searchHits = hits.getHits();
        //日期格式化对象

也可以进行高亮查询：原理是这样的，给高亮字段添加标签，到时候展示即可：

//搜索请求对象
        SearchRequest searchRequest = new SearchRequest("cxy");
        //指定类型
        searchRequest.types("doc");
        //搜索源构建对象
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();

        //boolQuery搜索方式
        //先定义一个MultiMatchQuery
        MultiMatchQueryBuilder multiMatchQueryBuilder = QueryBuilders.multiMatchQuery("开发框架", "name", "description")
                .minimumShouldMatch("50%")
                .field("name", );

        //定义一个boolQuery
        BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
        boolQueryBuilder.must(multiMatchQueryBuilder);
        //定义过虑器
        boolQueryBuilder.filter(QueryBuilders.rangeQuery("price").gte().lte());

        searchSourceBuilder.query(boolQueryBuilder);
        //设置源字段过虑,第一个参数结果集包括哪些字段，第二个参数表示结果集不包括哪些字段
        searchSourceBuilder.fetchSource(new String[]{"name","studymodel","price","timestamp"},new String[]{});

        //设置高亮
        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);

        //向搜索请求对象中设置搜索源
        searchRequest.source(searchSourceBuilder);
        //执行搜索,向ES发起http请求
        SearchResponse searchResponse = client.search(searchRequest);
        //搜索结果
        SearchHits hits = searchResponse.getHits();
        //匹配到的总记录数
        long totalHits = hits.getTotalHits();
        //得到匹配度高的文档
        SearchHit[] searchHits = hits.getHits();

取高亮：

  //源文档的name字段内容
            String name = (String) sourceAsMap.get("name");
            //取出高亮字段
            Map<String, HighlightField> highlightFields = hit.getHighlightFields();
            if(highlightFields!=null){
                //取出name高亮字段
                HighlightField nameHighlightField = highlightFields.get("name");
                if(nameHighlightField!=null){
                    Text[] fragments = nameHighlightField.getFragments();
                    StringBuffer stringBuffer = new StringBuffer();
                    for(Text text:fragments){
                        stringBuffer.append(text);
                    }
                    name = stringBuffer.toString();
                }
            }

排序查询：

  SearchRequest searchRequest = new SearchRequest("cxy");
        //指定类型
        searchRequest.types("doc");
        //搜索源构建对象
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();

        //boolQuery搜索方式
        //定义一个boolQuery
        BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
        //定义过虑器
        boolQueryBuilder.filter(QueryBuilders.rangeQuery("price").gte().lte());

        searchSourceBuilder.query(boolQueryBuilder);
        //添加排序
        searchSourceBuilder.sort("studymodel", SortOrder.DESC);
        searchSourceBuilder.sort("price", SortOrder.ASC);
        //设置源字段过虑,第一个参数结果集包括哪些字段，第二个参数表示结果集不包括哪些字段
        searchSourceBuilder.fetchSource(new String[]{"name","studymodel","price","timestamp"},new String[]{});
        //向搜索请求对象中设置搜索源
        searchRequest.source(searchSourceBuilder);
        //执行搜索,向ES发起http请求
        SearchResponse searchResponse = client.search(searchRequest);
        //搜索结果
        SearchHits hits = searchResponse.getHits();
        //匹配到的总记录数
        long totalHits = hits.getTotalHits();
        //得到匹配度高的文档
        SearchHit[] searchHits = hits.getHits();

keyword可以通过前端传输参数进行

这个地方，参数是由前端传输进来的。

返回参数，可以在：

  SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        for(SearchHit hit:searchHits){
            //文档的主键
            String id = hit.getId();
            //源文档内容
            Map<String, Object> sourceAsMap = hit.getSourceAsMap();
            String name = (String) sourceAsMap.get("name");
            //由于前边设置了源文档字段过虑，这时description是取不到的
            String description = (String) sourceAsMap.get("description");
            //学习模式
            String studymodel = (String) sourceAsMap.get("studymodel");
            //价格
            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);
        }

在这里构建结果返回给前端

多数情况开发中，是将这些都会用到。在基础篇中讲到了es的相关概念，在第二篇中解决了各种版本问题，那么es的本身会有什么问题吗，等待下篇继续介绍，脑裂，索引优化等