目录
12.8 RestClient查询文档
12.8.1 快速入门
12.8.2 match， term，bool，range查询
12.8.3 排序和分页
12.8.4 高亮
12.8 RestClient查询文档
12.8.1 快速入门
@Test
void testMatchALL() throws IOException {
// 1. 准备request
SearchRequest request = new SearchRequest("hotel");
// 2. 准备DSL
request.source()
.query(QueryBuilders.matchAllQuery());
// 3. 发送请求
SearchResponse response = client.search(request, RequestOptions.DEFAULT);
System.out.println(response);
}
结果解析:
@Test
void testMatchALL() throws IOException {
// 1. 准备request
SearchRequest request = new SearchRequest("hotel");
// 2. 准备DSL
request.source()
.query(QueryBuilders.matchAllQuery());
// 3. 发送请求
SearchResponse response = client.search(request, RequestOptions.DEFAULT);
// 4. 结果解析
SearchHits searchHits = response.getHits();
// 4.1 获取总条数
long total = searchHits.getTotalHits().value;
System.out.println(total);
// 4.2 获取文档数组
SearchHit[] hits = searchHits.getHits();
for (SearchHit hit : hits) {
// 取文档source
String json = hit.getSourceAsString();
// 反序列化
HotelDoc hotelDoc = JSON.parseObject(json, HotelDoc.class);
System.out.println(hotelDoc);
}
}
12.8.2 match， term，bool，range查询
把结果解析的代码抽取成方法
private void HandleResponse(SearchResponse response){
// 4. 结果解析
SearchHits searchHits = response.getHits();
// 4.1 获取总条数
long total = searchHits.getTotalHits().value;
System.out.println(total);
// 4.2 文档数组
SearchHit[] hits = searchHits.getHits();
for (SearchHit hit : hits) {
// 取文档source
String json = hit.getSourceAsString();
// 反序列化
HotelDoc hotelDoc = JSON.parseObject(json, HotelDoc.class);
System.out.println(hotelDoc);
}
}
match查询
@Test
void testMatch() throws IOException {
// 1. 准备request
SearchRequest request = new SearchRequest("hotel");
// 2. 准备DSL
request.source()
.query(QueryBuilders.matchQuery("all","如家"));
// 3. 发送请求
SearchResponse response = client.search(request, RequestOptions.DEFAULT);
HandleResponse(response);
}
bool查询:
@Test
void testBool() throws IOException {
// 1. 准备request
SearchRequest request = new SearchRequest("hotel");
// 2. 准备DSL
// 2.1 准备BooleanQuery
BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
// 2.2 添加term
boolQuery.must(QueryBuilders.termQuery("city","上海"));
// 2.3 添加range
boolQuery.filter(QueryBuilders.rangeQuery("price").lte(250));
request.source().query(boolQuery);
// 3. 发送请求
SearchResponse response = client.search(request, RequestOptions.DEFAULT);
HandleResponse(response);
}
12.8.3 排序和分页
@Test
void testPageAndSort() throws IOException {
// 1. 准备request
SearchRequest request = new SearchRequest("hotel");
// 2. 准备DSL
// 2.1 query
request.source().query(QueryBuilders.matchAllQuery());
// 2.2 排序sort
request.source().sort("price", SortOrder.ASC);
// 2.3 分页 from size
request.source().from(56).size(10); // 第56条开始展示10条
// 3. 发送请求
SearchResponse response = client.search(request, RequestOptions.DEFAULT);
HandleResponse(response);
}
12.8.4 高亮
@Test
void testHighLight() throws IOException {
// 1. 准备request
SearchRequest request = new SearchRequest("hotel");
// 2. 准备DSL
// 2.1 query
request.source().query(QueryBuilders.matchQuery("all","如家"));
// 2.2 高亮
request.source().highlighter(new HighlightBuilder().field("name").requireFieldMatch(false));
// 3. 发送请求
SearchResponse response = client.search(request, RequestOptions.DEFAULT);
HandleHighLightResponse(response);
}
高亮结果解析 :
private void HandleHighLightResponse(SearchResponse response){
// 4. 结果解析
SearchHits searchHits = response.getHits();
// 4.1 获取总条数
long total = searchHits.getTotalHits().value;
System.out.println(total);
// 4.2 文档数组
SearchHit[] hits = searchHits.getHits();
for (SearchHit hit : hits) {
// 取文档source
String json = hit.getSourceAsString();
// 反序列化
HotelDoc hotelDoc = JSON.parseObject(json, HotelDoc.class);
// 获取高亮结果
Map<String, HighlightField> highlightFields = hit.getHighlightFields();
if(!CollectionUtils.isEmpty(highlightFields)){
// 根据名字获取高亮结果
HighlightField highlightField = highlightFields.get("name");
if(highlightField != null){
// 获取高亮值
String name = highlightField.getFragments()[0].string();
// 覆盖非高亮结果
hotelDoc.setName(name);
}
}
System.out.println(hotelDoc);
}
}
