文章目录
DSL查询文档
RestClient查询文档
快速入门
java
@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 search = client.search(request, RequestOptions.DEFAULT);
System.out.println(search);
}
java
@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", "杭州"));
//2.3添加range
boolQuery.filter(QueryBuilders.rangeQuery("price").lte(250));
request.source().query(boolQuery);
//3.发送请求
SearchResponse search = client.search(request, RequestOptions.DEFAULT);
//4.解析响应
handleResponse(search);
}
旅游案例
Controller层
java
@RestController
@RequestMapping("/hotel")
public class HotelController {
@Autowired
private IHotelService hotelService;
@PostMapping("/list")
public PageResult search(@RequestBody RequestParams params){
return hotelService.search(params);
}
}Service实现类
java
@Service
public class HotelService extends ServiceImpl<HotelMapper, Hotel> implements IHotelService {
@Autowired
private RestHighLevelClient client;
@Override
public PageResult search(RequestParams params) {
try {
//1.准备Request
SearchRequest request = new SearchRequest("hotel");
//2.准备DSL
//2.1query
String key = params.getKey();
if (key == null||"".equals(key)){
request.source().query(QueryBuilders.matchAllQuery());
}else{
request.source().query(QueryBuilders.matchQuery("all",key));
}
//2.2分页
int page = params.getPage();
int size = params.getSize();
request.source().from(page-1).size(size);
//3.发送请求，得到响应
SearchResponse response = client.search(request, RequestOptions.DEFAULT);
//4.解析响应
return handleResponse(response);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
private PageResult handleResponse(SearchResponse response) {
//解析响应
SearchHits searchHits = response.getHits();
//获取总条数
long total = searchHits.getTotalHits().value;
System.out.println("共有:"+total);
//文档数组
SearchHit[] hits = searchHits.getHits();
//遍历
List<HotelDoc> hote ls = new ArrayList<>();
for (SearchHit hit : hits) {
//获取文档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)){
//根据字段名称获取高亮结果
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);
}
}
hotels.add(hotelDoc);
}
return new PageResult(total,hotels);
}
}
修改Service实现类
java
@Service
public class HotelService extends ServiceImpl<HotelMapper, Hotel> implements IHotelService {
@Autowired
private RestHighLevelClient client;
@Override
public PageResult search(RequestParams params) {
try {
//1.准备Request
SearchRequest request = new SearchRequest("hotel");
//2.准备DSL
//2.1query
//构建BooleanQuery
BoolQueryBuilder boolQuery = buildBasicQuery(params, request);
request.source().query(boolQuery);
//2.2分页
int page = params.getPage();
int size = params.getSize();
request.source().from(page-1).size(size);
//3.发送请求，得到响应
SearchResponse response = client.search(request, RequestOptions.DEFAULT);
//4.解析响应
return handleResponse(response);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
private BoolQueryBuilder buildBasicQuery(RequestParams params, SearchRequest request) {
BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
//全文检索 must关键字搜索
String key = params.getKey();
if (key == null||"".equals(key)){
boolQuery.must(QueryBuilders.matchAllQuery());
}else{
boolQuery.must(QueryBuilders.matchQuery("all",key));
}
// 城市条件
if (params.getCity() != null && !params.getCity().equals("")){
boolQuery.filter(QueryBuilders.termQuery("city", params.getCity()));
}
request.source().query(boolQuery);
// 品牌条件
if (params.getBrand() != null && !params.getBrand().equals("")){
boolQuery.filter(QueryBuilders.termQuery("brand", params.getBrand()));
}
// 星级条件
if (params.getStarName() != null && !params.getStarName().equals("")){
boolQuery.filter(QueryBuilders.termQuery("starName", params.getStarName()));
}
//价格
if (params.getMinPrice() != null && !params.getMinPrice().equals("")){
boolQuery.filter(QueryBuilders
.rangeQuery("price").gte(params.getMinPrice()).lte(params.getMaxPrice()));
}
return boolQuery;
}
private PageResult handleResponse(SearchResponse response) {
//解析响应
SearchHits searchHits = response.getHits();
//获取总条数
long total = searchHits.getTotalHits().value;
System.out.println("共有:"+total);
//文档数组
SearchHit[] hits = searchHits.getHits();
//遍历
List<HotelDoc> hotels = new ArrayList<>();
for (SearchHit hit : hits) {
//获取文档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)){
//根据字段名称获取高亮结果
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);
}
}
hotels.add(hotelDoc);
}
return new PageResult(total,hotels);
}
}
修改Service中代码
java
//2.3排序
String location = params.getLocation();
if (location != null && !location.equals("")){
request.source().sort(SortBuilders
.geoDistanceSort("location", new GeoPoint(location))
.order(SortOrder.ASC)
.unit(DistanceUnit.KILOMETERS)
);
}在解析响应中添加
java
//获取排序值
Object[] sortValues = hit.getSortValues();
if (sortValues.length>0){
Object sortValue = sortValues[0];
hotelDoc.setDistance(sortValue);
}
在BooleanSearch中添代码
java
//2.算分控制
FunctionScoreQueryBuilder functionScoreQuery = QueryBuilders.functionScoreQuery(boolQuery,
// function score的数组
new FunctionScoreQueryBuilder.FilterFunctionBuilder[]{
//其中一个function score元素
new FunctionScoreQueryBuilder.FilterFunctionBuilder(
// 过滤条件
QueryBuilders.termQuery("isAD", true),
//算分函数
ScoreFunctionBuilders.weightFactorFunction(10)
)
});
request.source().query(functionScoreQuery);