分布式搜索引擎ElasticSearch------搜索功能
文章目录
DSL查询文档
DSL查询分类
全文检索查询
精确查询
地理查询
复合查询
Function Score Query
Boolean Query
搜索结果处理
排序
分页
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高亮
RestClient查询文档
快速入门
java
public class HotelSearchTest {
private RestHighLevelClient client;
@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. 解析响应
SearchHits searchHits = response.getHits();
// 4.1 获取总条数
long total = searchHits.getTotalHits().value;
System.out.println("共搜索到" + total + "条数据");
// 4.2 文档数组
SearchHit[] hits = searchHits.getHits();
// 4.3 遍历
for (SearchHit hit : hits) {
// 获取文档source
String json = hit.getSourceAsString();
// 反序列化
HotelDoc hotelDoc = JSON.parseObject(json, HotelDoc.class);
System.out.println("hotelDoc = " + hotelDoc);
}
System.out.println(response);
}
@BeforeEach
void setUp(){
this.client = new RestHighLevelClient(RestClient.builder(
HttpHost.create("http://192.168.10.88:9200")
));
}
@AfterEach
void tearDown() throws IOException {
this.client.close();
}
}
match，term，range，bool查询
java
// 全文检索查询
@Test
void testMatch() throws IOException {
// 1. 准备Request
SearchRequest request = new SearchRequest("hotel");
// 2. 准备DSL
request.source().query(QueryBuilders.matchQuery("all","皇冠"));
// 3. 发送请求
SearchResponse response = client.search(request, RequestOptions.DEFAULT);
handleResponse(response);
System.out.println(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","杭州"));
// 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);
System.out.println(response);
}
// 抽取解析的代码
private static void handleResponse(SearchResponse response) {
// 4. 解析响应
SearchHits searchHits = response.getHits();
// 4.1 获取总条数
long total = searchHits.getTotalHits().value;
System.out.println("共搜索到" + total + "条数据");
// 4.2 文档数组
SearchHit[] hits = searchHits.getHits();
// 4.3 遍历
for (SearchHit hit : hits) {
// 获取文档source
String json = hit.getSourceAsString();
// 反序列化
HotelDoc hotelDoc = JSON.parseObject(json, HotelDoc.class);
System.out.println("hotelDoc = " + hotelDoc);
}
}
排序和分页
java
// 排序和分页
@Test
void testPageAndSort() throws IOException {
// 页码。每页大小
int page = 2, size = 5;
// 1. 准备Request
SearchRequest request = new SearchRequest("hotel");
// 2. 准备DSL
// 2.1 query
request.source().query(QueryBuilders.matchAllQuery());
// 2.2 配许sort
request.source().sort("price", SortOrder.ASC);
// 2.3 分页from， size
request.source().from((page-1)*size).size(5);
// 3. 发送请求
SearchResponse response = client.search(request, RequestOptions.DEFAULT);
// 4. 解析响应
handleResponse(response);
}高亮显示
java
// 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);
// 4. 解析响应
handleResponse(response);
}
就是在前面抽取的解析代码中进一步添加关于高亮的解析部分，因为highlight和source是同级目录的，所以采用的方法类似。
java
// 抽取解析的代码
private static void handleResponse(SearchResponse response) {
// 4. 解析响应
SearchHits searchHits = response.getHits();
// 4.1 获取总条数
long total = searchHits.getTotalHits().value;
System.out.println("共搜索到" + total + "条数据");
// 4.2 文档数组
SearchHit[] hits = searchHits.getHits();
// 4.3 遍历
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 = " + hotelDoc);
}
}
黑马旅游案例
基本的搜索和分页
java
@RestController
@RequestMapping("/hotel")
public class HotelController {
@Autowired
private IHotelService hotelService;
@PostMapping("/list")
public PageResult search(@RequestBody RequestParams params){
return hotelService.search(params);
}
}
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
// 2.1 query
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(size);
// 3. 发送请求
SearchResponse response = client.search(request, RequestOptions.DEFAULT);
// 4. 解析响应
return handleResponse(response);
}catch (IOException e){
throw new RuntimeException(e);
}
}
// 抽取解析的代码
private PageResult handleResponse(SearchResponse response) {
// 4. 解析响应
SearchHits searchHits = response.getHits();
// 4.1 获取总条数
long total = searchHits.getTotalHits().value;
// 4.2 文档数组
SearchHit[] hits = searchHits.getHits();
// 4.3 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);
hotels.add(hotelDoc);
}
// 4.4 封装返回
return new PageResult(total,hotels);
}
}条件过滤
java
@Override
public PageResult search(RequestParams params) {
try {// 1. 准备Request
SearchRequest request = new SearchRequest("hotel");
// 2. 准备DSL
// 2.1 query
// 构建BooleanQuery
buildBasicQuery(params, request);
// 2.2 分页
int page = params.getPage();
int size = params.getSize();
request.source().from((page - 1) * size).size(size);
// 3. 发送请求
SearchResponse response = client.search(request, RequestOptions.DEFAULT);
// 4. 解析响应
return handleResponse(response);
}catch (IOException e){
throw new RuntimeException(e);
}
}
private static void buildBasicQuery(RequestParams params, SearchRequest request) {
BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
// 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));
}
// 条件过滤
// 城市
if(params.getCity() != null && !"".equals(params.getCity())){
boolQuery.filter(QueryBuilders.termQuery("city", params.getCity()));
}
// 品牌
if(params.getBrand() != null && !"".equals(params.getBrand())){
boolQuery.filter(QueryBuilders.termQuery("brand", params.getBrand()));
}
// 星级
if(params.getStarName() != null && !"".equals(params.getStarName())){
boolQuery.filter(QueryBuilders.termQuery("starName", params.getStarName()));
}
// 价格------范围过滤
if(params.getMinPrice() != null && params.getMaxPrice() != null){
boolQuery.filter(QueryBuilders.rangeQuery("price").gte(params.getMinPrice()).lte(params.getMaxPrice()));
}
request.source().query(boolQuery);
}找周边的酒店
广告置顶
java
// 2. 算分控制
FunctionScoreQueryBuilder functionScoreQuery =
QueryBuilders.functionScoreQuery(
// 原始查询，相关性算分的查询
boolQuery,
// function score的数组
new FunctionScoreQueryBuilder.FilterFunctionBuilder[]{
// 其中的一个function score元素
new FunctionScoreQueryBuilder.FilterFunctionBuilder(
// 过滤条件
QueryBuilders.termQuery("isAD",true),
// 算分函数
ScoreFunctionBuilders.weightFactorFunction(10)
)
});