elasticsearch 高亮搜索字段

系统管理员 2023-06-28 08:39 1阅读 0赞

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### elasticsearch 高亮搜索字段 ###

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**相关类与接口**

**HighlightBuilder：高亮构造器**

public class HighlightBuilder extends AbstractHighlighterBuilder<HighlightBuilder> {
 
 *********
 构造方法
 
 public HighlightBuilder() {
 public HighlightBuilder(HighlightBuilder template, QueryBuilder highlightQuery, List<HighlightBuilder.Field> fields) {
 public HighlightBuilder(StreamInput in) throws IOException {
 
 
 *********
 常用方法
 
 public HighlightBuilder field(String name) {
 public HighlightBuilder field(String name, int fragmentSize) {
 public HighlightBuilder field(String name, int fragmentSize, int numberOfFragments) {
 public HighlightBuilder field(String name, int fragmentSize, int numberOfFragments, int fragmentOffset) {
 public HighlightBuilder field(HighlightBuilder.Field field) {
 
 void fields(List<HighlightBuilder.Field> fields) {
 public List<HighlightBuilder.Field> fields() {

**AbstractHighlighterBuilder**

public abstract class AbstractHighlighterBuilder<HB extends AbstractHighlighterBuilder<?>> implements Writeable, Rewriteable<HB>, ToXContentObject {
 
 *********
 常用方法
 
 public HB preTags(String... preTags) { //设置前缀
 public String[] preTags() {
 
 public HB postTags(String... postTags) { //设置后缀
 public String[] postTags() {

**ElasticsearchRestTemplate：操作类**

public class ElasticsearchRestTemplate extends AbstractElasticsearchTemplate implements ElasticsearchOperations, EsClient<RestHighLevelClient>, ApplicationContextAware {
 
 public <T> AggregatedPage<T> queryForPage(SearchQuery query, Class<T> clazz, SearchResultMapper mapper) {

**SearchResultMapper：搜索结果映射类**

public interface SearchResultMapper {
 <T> AggregatedPage<T> mapResults(SearchResponse var1, Class<T> var2, Pageable var3);
 
 @Nullable
 <T> T mapSearchHit(SearchHit var1, Class<T> var2);
 }

**SearchResponse**

public class SearchResponse extends ActionResponse implements StatusToXContentObject {
    
        public SearchHits getHits() {

**SearchHit**

public final class SearchHit implements Streamable, ToXContentObject, Iterable<DocumentField> {
 
 public Map<String, HighlightField> getHighlightFields() {

**HightField**

public class HighlightField implements ToXContentFragment, Streamable {
    
        public Text[] fragments() {
        public Text[] getFragments() {

**Text**

public final class Text implements Comparable<Text>, ToXContentFragment {
 
 public String string() {
 public String toString() {

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**示例**

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**conroller 层**

@RestController
 public class PersonController {
 
 @Resource
 private PersonRepository personRepository;
 
 @Resource
 private ElasticsearchRestTemplate elasticsearchRestTemplate;
 
 @RequestMapping("/save")
 public String save(){
 for (int i=0;i<100;i++){
 Person person=new Person();
 person.setId(i);
 person.setName("瓜田李下 "+i);
 person.setAge(i/10+10);
 
 personRepository.save(person);
 }
 
 return "success";
 }
 
 @RequestMapping("/highlight")
 @SuppressWarnings("unchecked")
 public List<Person> highlight(){
 QueryBuilder queryBuilder=QueryBuilders.regexpQuery("name","瓜田李下 1.");
 HighlightBuilder highlightBuilder=new HighlightBuilder().field("name")
 .preTags("").postTags("")
 .requireFieldMatch(false);
 
 NativeSearchQuery nativeSearchQuery=new NativeSearchQueryBuilder()
 .withQuery(queryBuilder)
 .withHighlightBuilder(highlightBuilder).build();
 
 AggregatedPage<Person> aggregatedPage=elasticsearchRestTemplate.queryForPage(nativeSearchQuery,
 Person.class, new SearchResultMapper() {
 @Override
 public <T> AggregatedPage<T> mapResults(SearchResponse searchResponse, Class<T> aClass, Pageable pageable) {
 List<Person> list=new ArrayList<>();
 
 SearchHits searchHits=searchResponse.getHits();
 if (searchHits.getHits().length!=0){
 for (SearchHit searchHit:searchHits){
 Person person=new Person();
 
 Map<String,Object> map=searchHit.getSourceAsMap();
 person.setId(Integer.parseInt(map.get("id").toString()));
 person.setAge(Integer.parseInt(map.get("age").toString()));
 
 HighlightField nameField=searchHit.getHighlightFields().get("name");
 if (nameField!=null){
 person.setName(nameField.getFragments()[0].toString());
 }else {
 person.setName(map.get("name").toString());
 }
 
 list.add(person);
 }
 }
 
 if (list.size()!=0){
 return new AggregatedPageImpl<>((List<T>)list);
 }
 
 return null;
 }
 
 @Override
 public <T> T mapSearchHit(SearchHit searchHit, Class<T> aClass) {
 return null;
 }
 });
 
 List<Person> list=aggregatedPage.getContent();
 list.forEach(System.out::println);
 
 return list;
 }
 }

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**使用测试**

**/highlight**

Person(id=11, name=瓜田李下 11, age=11)
 Person(id=13, name=瓜田李下 13, age=11)
 Person(id=16, name=瓜田李下 16, age=11)
 Person(id=17, name=瓜田李下 17, age=11)
 Person(id=19, name=瓜田李下 19, age=11)
 Person(id=10, name=瓜田李下 10, age=11)
 Person(id=14, name=瓜田李下 14, age=11)
 Person(id=12, name=瓜田李下 12, age=11)
 Person(id=15, name=瓜田李下 15, age=11)
 Person(id=18, name=瓜田李下 18, age=11)