Spring Boot + Elasticsearch

spring data elasticsearch	elasticsearch
2.0.0.RELEASE	2.2.0
1.4.0.M1	1.7.3
1.3.0.RELEASE	1.5.2
1.2.0.RELEASE	1.4.4
1.1.0.RELEASE	1.3.2
1.0.0.RELEASE

https://github.com/helloworldtang/spring-data-elasticsearch

1、None of the configured nodes are available 或者

　　org.elasticsearch.transport.RemoteTransportException: Failed to deserialize exception response from stream

　原因：spring data elasticSearch 的版本与Spring boot、Elasticsearch版本不匹配。

　解决：

Spring Boot Version (x)	Spring Data Elasticsearch Version (y)	Elasticsearch Version (z)
x <= 1.3.5	y <= 1.3.4	z <= 1.7.2*
x >= 1.4.x	2.0.0 <=y < 5.0.0**	2.0.0 <= z < 5.0.0**

　　　　这是版本之间的对应关系。Spring boot 1.3.5默认的elasticsearch版本是1.5.2，此时启动1.7.2版本以下的Elasticsearch客户端连接正常。

　　注：注意java的es默认连接端口是9300，9200是http端口，这两个在使用中应注意区分。

2、Caused by: java.lang.IllegalArgumentException: @ConditionalOnMissingBean annotations must specify at least one bean (type, name or annotation)

　　原因：spring boot是1.3.x版本，而es采用了2.x版本。在es的2.x版本去除了一些类，而这些类在spring boot的1.3.x版本中仍然被使用，导致此错误。

　　解决：依照问题1中的版本对应关系，启动特定版本的es即可。

http://www.cnblogs.com/slimer/p/5643820.html

 

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We often use Elasticsearch to improve performance in our application, especially searching and caching, to make our application scale and adapt in real-time.

Elasticsearch is a flexible and powerful open source, distributed, real-time search and analytics engine. In this article, I would like to introduce how to use Elasticsearch in java applications: by using Spring Boot data Elasticsearch. Spring Boot now easy and powerful, and we can build fast Java and web applications with a simple configuration.

By following the steps below, you can start writing your first application.

Source code: https://github.com/herotl2005/spring-data-elasticsearch-sample

Requirement enviroment

1. Install Elasticsearch

2. Install Gradle

3. IDE Eclipse or Intellij  IDEA

Step by Step Coding

1. Gradle build

dependencies {
testCompile group: 'junit', name: 'junit', version: '4.11'
compile 'org.springframework.boot:spring-boot-starter-data-elasticsearch:1.2.0.RELEASE'
compile 'org.springframework.data:spring-data-cassandra:1.1.1.RELEASE'
compile 'org.springframework:spring-test:4.1.2.RELEASE'
compile 'org.springframework.boot:spring-boot-starter-logging:1.2.0.RELEASE'
compile 'org.springframework.boot:spring-boot-starter-web:1.2.0.RELEASE'
compile 'org.springframework.boot:spring-boot-starter-actuator:1.2.0.RELEASE'
}

2. Elasticsearch configuration

@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());
     }
}

You put elasticsearch host and post in your application properties file.

elasticsearch.host = localhost
 # if you use you local elasticsearch host
elasticsearch.port = 9300

3. Data mapping object:

In this application, we have 2 entities data object mapping: Post and Tag

@Document(indexName = "post", type = "post", shards = 1, replicas = 0)
public class Post {
@Idprivate String id;    private String title;//
@Field(type= FieldType.Nested)
private List<Tag> 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<Tag> getTags() {
        return tags;
}

    public void setTags(List<Tag> 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;
  }
}

4. Repository: we extends from ElasticsearchRepository

public interface PostRepository extends ElasticsearchRepository<Post, String>{

    Page<Post> findByTagsName(String name, Pageable pageable);
}

5. Data access service

public interface PostService {
    Post save(Post post);
    Post findOne(String id);
    Iterable<Post> findAll();
    Page<Post> 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<Post> findAll() {
        return postRepository.findAll();
   }

    @Overridepublic Page<Post> findByTagsName(String tagName, PageRequest pageRequest) {
        return postRepository.findByTagsName(tagName, pageRequest);
   }
}

6. Testing and the result

@Testpublic 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<Post> posts  = postService.findByTagsName("tech", new PageRequest(0,10));Page<Post> posts2  = postService.findByTagsName("tech", new PageRequest(0,10));Page<Post> posts3  = postService.findByTagsName("maz", new PageRequest(0,10));assertThat(posts.getTotalElements(), is(1L));
assertThat(posts2.getTotalElements(), is(1L));
assertThat(posts3.getTotalElements(), is(0L));
}

7. You can find detail project at github: https://github.com/herotl2005/spring-data-elasticsearch-sample

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转载地址：https://dzone.com/articles/first-step-spring-boot-and

http://blog.csdn.net/hong0220/article/details/50583409

spring data elasticsearch 查询方式：

1、通过名字解析

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public interface BookRepository extends Repository<Book, String> {     List<Book> findByNameAndPrice(String name, Integer price); } 根据上面的方法名会生成下面的Elasticsearch查询语句 { "bool" :     { "must" :         [             { "field" : {"name" : "?"} },             { "field" : {"price" : "?"} }         ]     } }

2、@query注解

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public interface BookRepository extends ElasticsearchRepository<Book, String> {     @Query("{"bool" : {"must" : {"field" : {"name" : "?0"}}}}")     Page<Book> findByName(String name,Pageable pageable); }

3、构建Filter

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使用过滤器可以提高查询速度+   private ElasticsearchTemplate elasticsearchTemplate;   SearchQuery searchQuery = new NativeSearchQueryBuilder()     .withQuery(matchAllQuery())     .withFilter(boolFilter().must(termFilter("id", documentId)))     .build();   Page<SampleEntity> sampleEntities =     elasticsearchTemplate.queryForPage(searchQuery,SampleEntity.class);

利用Scan和Scroll处理大结果集

Elasticsearch在处理大结果集时可以使用scan和scroll。在Spring Data Elasticsearch中，可以向下面那样使用ElasticsearchTemplate来使用scan和scroll处理大结果集。

Example 39. Using Scan and Scroll(使用scan和scroll)

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SearchQuery searchQuery = new NativeSearchQueryBuilder()     .withQuery(matchAllQuery())     .withIndices("test-index")     .withTypes("test-type")     .withPageable(new PageRequest(0,1))     .build(); String scrollId = elasticsearchTemplate.scan(searchQuery,1000,false); List<SampleEntity> sampleEntities = new ArrayList<SampleEntity>(); boolean hasRecords = true; while (hasRecords){     Page<SampleEntity> page = elasticsearchTemplate.scroll(scrollId, 5000L , new ResultsMapper<SampleEntity>()     {         @Override         public Page<SampleEntity> mapResults(SearchResponse response) {             List<SampleEntity> chunk = new ArrayList<SampleEntity>();             for(SearchHit searchHit : response.getHits()){                 if(response.getHits().getHits().length <= 0) {                     return null;                 }                 SampleEntity user = new SampleEntity();                 user.setId(searchHit.getId());                 user.setMessage((String)searchHit.getSource().get("message"));                 chunk.add(user);             }             return new PageImpl<SampleEntity>(chunk);         }     });     if(page != null) {         sampleEntities.addAll(page.getContent());         hasRecords = page.hasNextPage();     }     else{         hasRecords = false;     }     } }

http://www.cnblogs.com/rainwang/p/5725214.html