SpringBoot整合ElasticSearch詳解及相關(guān)使用方法

作者：Springboot實(shí)戰(zhàn)案例錦集 2023-07-03 15:55:05

繼承ElasticsearchRepository后我們也可以像data-jpa一樣使用findBy*等語法來寫相關(guān)查詢方法。

環(huán)境：springboot2.3.10.RELEASE + ElasticSearch7.8.0

數(shù)據(jù)模型建立

@Document(createIndex = true, indexName = "products", shards = 3, replicas = 1)
public class Product {


  @Id
  private Long id ;
  @Field(analyzer = "ik_max_word", type = FieldType.Text)
  private String title ;
  @Field(type= FieldType.Keyword)
  private String category ;
  @Field(type = FieldType.Double)
  private Double price ;
  @Field(type = FieldType.Keyword, index = false)
  private String images ;
  @Override
  public String toString() {
    return "Product [id=" + id + ", title=" + title + ", category=" + category + ", price=" + price + ", images="
      + images + "]";
  }


}

ProductRepository

這里我們只需要繼承ElasticsearchRepository即可，是不是和data-jpa一樣一樣的的。

public interface ProductRepository extends ElasticsearchRepository<Product, Long> {
}

繼承ElasticsearchRepository后我們也可以像data-jpa一樣使用findBy*等語法來寫相關(guān)查詢方法。

方法名中支持的關(guān)鍵字

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方法返回值類型

List<T>
Stream<T>
SearchHits<T>
List<SearchHit<T>>
Stream<SearchHit<T>>
SearchPage<T>

Repository中也支持@Query注解的方式自定義查詢字符串。

public interface ProductRepository extends ElasticsearchRepository<Product, Long> {
  
  List<Product> findByTitle(String title) ;
  
  @Query("{\"fuzzy\": {\"title\": \"?0\"}}")
  Page<Product> findByTitle(String sex,Pageable pageable);
  // 自定義查詢
  @Query("{\"match\": {\"category\": \"?0\"}}")
  Page<Product> findByCategory(String category,Pageable pageable);
  
  // 高亮設(shè)置
  @Highlight(fields = {@HighlightField(name = "title"), @HighlightField(name = "category")})
  List<SearchHit<Product>> findByTitleOrCategory(String title, String category,Pageable pageable) ;
}

除了使用Repository方式，我們還可以使用ElasticsearchRestTemplate的方式請(qǐng)求服務(wù)。如下測(cè)試

測(cè)試

@Resource
private ProductRepository productRepository ;
@Resource
private ElasticsearchRestTemplate elasticTemplate ;
  
@Test
public void testCreate() {
  Product product = new Product() ;
  product.setId(3L) ;
  product.setCategory("配件") ;
  product.setPrice(299.5d) ;
  product.setImages("http://www.pack.com/memory.jpg") ;
  product.setTitle("很牛逼的內(nèi)存條") ;
  productRepository.save(product) ;
}
  
@Test
public void testQuery() {
  Product product = productRepository.findById(1L).orElse(null) ;
  System.out.println(product) ;
}
  
@Test
public void testFindAll() {
  Pageable pageable = PageRequest.of(1, 2) ;
  Page<Product> page = productRepository.findAll(pageable) ;
  System.out.println(page.getTotalPages() + "\n" + page.getContent()) ;
}
  
@Test
public void testTermSearch() {
  for (Product p : productRepository.findByTitle("Java從入門到精通")) {
    System.out.println(p) ;
  }
}
  
@Test
public void testFindByTitle() {
  Pageable pageable = PageRequest.of(0, 2) ;
  Page<Product> page = productRepository.findByTitle("Java", pageable) ;
  System.out.println(page.getTotalPages() + "\n" + page.getContent()) ;
}
  
@Test
public void testFindByCategory() {
  Pageable pageable = PageRequest.of(0, 2) ;
  Page<Product> page = productRepository.findByCategory("書籍", pageable) ;
  System.out.println(page.getTotalPages() + "\n" + page.getContent()) ;
}
  
@Test
public void testCriteriaQuery() {
  Criteria criteria = new Criteria("price").greaterThan(50).lessThan(80);
  Query query = new CriteriaQuery(criteria);
  SearchHits<Product> hits = elasticTemplate.search(query, Product.class, IndexCoordinates.of("products")) ;
  for (SearchHit<Product> hit : hits) {
    System.out.println(hit) ;
  }
}
  
@Test
public void testStringQuery() {
  Query query = new StringQuery("{ \"match\": { \"category\": { \"query\": \"配件\" } } } ");
  SearchHits<Product> hits = elasticTemplate.search(query, Product.class);
  for (SearchHit<Product> hit : hits) {
    System.out.println(hit) ;
  }
}


@Test
public void testStringQueryFuzzy() {
  Query query = new StringQuery("{ \"fuzzy\":{\"title\":{\"value\":\"Java\"}} }");
  HighlightQuery highlightQuery = null ;
  HighlightBuilder highBuilder = new HighlightBuilder().preTags("<font color='red'>").postTags("</font>").field("title") ;
  highlightQuery = new HighlightQuery(highBuilder) ;
  query.setHighlightQuery(highlightQuery) ;
  SearchHits<Product> hits = elasticTemplate.search(query, Product.class);
  for (SearchHit<Product> hit : hits) {
    System.out.println(hit + "\n" + hit.getHighlightField("title")) ;
  }
}

在啟動(dòng)服務(wù)時(shí)會(huì)自動(dòng)地為我們創(chuàng)建索引。

我們可以安裝Chrome插件 ElasticSearch Head非常方便地查看es的狀態(tài)及索引信息。

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