Elastic Search是一个开源的,分布式,实时搜索和分析引擎。Spring Boot为Elasticsearch及Spring Data Elasticsearch提供的基于它的抽象提供了基本的配置。Spring Boot提供了一个用于聚集依赖的spring-boot-starter-data-elasticsearch 'StarterPOM'。
引入spring-boot-starter-data-elasticsearch依赖,在pom.xml配置文件中增加如下内容(基于之前章节“Spring Boot 构建框架”中的pom.xml文件):
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-data-elasticsearchartifactId>
dependency>
可以像其他Spring beans那样注入一个自动配置的ElasticsearchTemplate或Elasticsearch客户端实例。默认情况下,该实例将尝试连接到一个本地内存服务器(在Elasticsearch项目中的一个NodeClient),但可以通过设置spring.data.elasticsearch.clusterNodes为一个以逗号分割的host:port列表来将其切换到一个远程服务器(比如,TransportClient)。
@Component
public class MyBean {
private ElasticsearchTemplate template;
@Autowired
public MyBean(ElasticsearchTemplate template) {
this.template = template;
}
// ...
}
如果添加一个自己的ElasticsearchTemplate类型的@Bean,它将替换默认的。
应用集成ElasticSearch案例
新建elasticsearch.properties配置文件,添加如下配置内容:
elasticsearch.host=localhost
elasticsearch.port=9300
ElasticSearch配置,读取elasticsearch.properties配置文件信息,具体代码如下:
@Configuration@PropertySource(value = "classpath:elasticsearch.properties")
@EnableElasticsearchRepositories(basePackages = "co.paan.repository")
public class ElasticsearchConfiguration {
@Resource
private Environment environment;
@Bean
public Client client() {
TransportClient client = new TransportClient();
TransportAddress address = new InetSocketTransportAddress(environment.getProperty("elasticsearch.host"), Integer.parseInt(environment.getProperty("elasticsearch.port")));
client.addTransportAddress(address);
return client;
}
@Beanpublic ElasticsearchOperations elasticsearchTemplate() {
return new ElasticsearchTemplate(client());
}
}
两个实体类,具体代码如下:
@Document(indexName = "post", type = "post", shards = 1, replicas = 0)
public class Post {
@Id
private String id;
private String title;
@Field(type= FieldType.Nested)
private List tags;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public List getTags() {
return tags;
}
public void setTags(List tags) {
this.tags = tags;
}
}
public class Tag {
private String id;
private String name;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
数据源继承ElasticsearchRepository类,封装接口代码如下:
public interface PostRepository extends ElasticsearchRepository<Post, String>{
Page findByTagsName(String name, Pageable pageable) ;
}
数据服务接口及实现类,代码如下:
public interface PostService {
Post save(Post post);
Post findOne(String id);
Iterable findAll() ;
Page findByTagsName(String tagName, PageRequest pageRequest) ;
}
@Servicepublic class PostServiceImpl implements PostService{
@Autowired
private PostRepository postRepository;
@Override
public Post save(Post post) {
postRepository.save(post);
return post;
}
@Overridepublic Post findOne(String id) {
return postRepository.findOne(id);
}
@Overridepublic Iterable findAll() {
return postRepository.findAll();
}
@Overridepublic Page findByTagsName(String tagName, PageRequest pageRequest) {
return postRepository.findByTagsName(tagName, pageRequest);
}
}
测试代码如下:
@Test
public void testFindByTagsName() throws Exception {
Tag tag = new Tag();
tag.setId("1");
tag.setName("tech");
Tag tag2 = new Tag();
tag2.setId("2");
tag2.setName("elasticsearch");
Post post = new Post();
post.setId("1");
post.setTitle("Bigining with spring boot application and elasticsearch");
post.setTags(Arrays.asList(tag, tag2));
postService.save(post);
Post post2 = new Post();
post2.setId("1");
post2.setTitle("Bigining with spring boot application");
post2.setTags(Arrays.asList(tag));
postService.save(post);
Page posts = postService.findByTagsName("tech", new PageRequest(0,10));
Page posts2 = postService.findByTagsName("tech", new PageRequest(0,10));
Page posts3 = postService.findByTagsName("maz", new PageRequest(0,10));
assertThat(posts.getTotalElements(), is(1L));
assertThat(posts2.getTotalElements(), is(1L));
assertThat(posts3.getTotalElements(), is(0L));
}
来源:素文宅博客
链接:https://blog.yoodb.com/yoodb/article/detail/1412