es高亮查询符号 es搜索高亮

7.3.10 高亮显示
高亮显示可以将搜索结果一个或多个字突出显示，以便向用户展示匹配关键字的位置。
在搜索语句中添加highlight即可实现，如下：
Post： http://127.0.0.1:9200/xc_course/doc/_search

{
	"_source" : [ "name", "studymodel", "description","price"],
	"query": {
		"bool" : {
			"must":[
				{
					"multi_match" : {
						"query" : "开发框架",
						"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":{}
		}
	}
}

运行结果：

{
    "took": 182,
    "timed_out": false,
    "_shards": {
        "total": 1,
        "successful": 1,
        "skipped": 0,
        "failed": 0
    },
    "hits": {
        "total": 3,
        "max_score": null,
        "hits": [
            {
                "_index": "xc_course",
                "_type": "doc",
                "_id": "1",
                "_score": null,
                "_source": {
                    "price": 38.6,
                    "studymodel": "201002",
                    "name": "Bootstrap开发",
                    "description": "Bootstrap是由Twitter推出的一个前台页面开发框架，是一个非常流行的开发框架，此框架集成了多种页面效果。此开发框架包含了大量的CSS、JS程序代码，可以帮助开发者（尤其是不擅长页面开发的程序人员）轻松的实现一个不受浏览器限制的精美界面效果。"
                },
                "highlight": {
                    "name": [
                        "Bootstrap<tag1>开发</tag2>"
                    ],
                    "description": [
                        "Bootstrap是由Twitter推出的一个前台页面<tag1>开发</tag2><tag1>框架</tag2>，是一个非常流行的<tag1>开发</tag2><tag1>框架</tag2>，此<tag1>框架</tag2>集成了多种页面效果。",
                        "此<tag1>开发</tag2><tag1>框架</tag2>包含了大量的CSS、JS程序代码，可以帮助<tag1>开发</tag2>者（尤其是不擅长页面<tag1>开发</tag2>的程序人员）轻松的实现一个不受浏览器限制的精美界面效果。"
                    ]
                },
                "sort": [
                    38.6
                ]
            },
            {
                "_index": "xc_course",
                "_type": "doc",
                "_id": "2",
                "_score": null,
                "_source": {
                    "price": 68.6,
                    "studymodel": "201001",
                    "name": "java编程基础",
                    "description": "java语言是世界第一编程语言，在软件开发领域使用人数最多。"
                },
                "highlight": {
                    "description": [
                        "java语言是世界第一编程语言，在软件<tag1>开发</tag2>领域使用人数最多。"
                    ]
                },
                "sort": [
                    68.6
                ]
            },
            {
                "_index": "xc_course",
                "_type": "doc",
                "_id": "3",
                "_score": null,
                "_source": {
                    "price": 88.6,
                    "studymodel": "201001",
                    "name": "spring开发基础",
                    "description": "spring 在java领域非常流行，java程序员都在用。"
                },
                "highlight": {
                    "name": [
                        "spring<tag1>开发</tag2>基础"
                    ]
                },
                "sort": [
                    88.6
                ]
            }
        ]
    }
}

client代码如下：

//Highlight
    @Test
    public void testHighlight() throws IOException, ParseException {
        //搜索请求对象
        SearchRequest searchRequest = new SearchRequest("xc_course");
        //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", 10);

        //定义一个boolQuery
        BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
        boolQueryBuilder.must(multiMatchQueryBuilder);
        //定义过虑器
        boolQueryBuilder.filter(QueryBuilders.rangeQuery("price").gte(0).lte(100));

        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();
        //日期格式化对象
        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();
            //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();
                }
            }

            //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);
        }

    }