Spring Data ElasticSearch入门案例

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a772304419 2022-01-21 10:43:45 ©著作权

文章标签 spring elasticsearch springdata maven xml 文章分类 代码人生

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Spring Data ElasticSearch入门案例

创建maven工程elasticsearch_springdata
基于maven导入坐标
导入spring data elasticsearch，它是对elasticsearch API的简化封装。

<dependency>
    <groupId>org.elasticsearch</groupId>
    <artifactId>elasticsearch</artifactId>
    <version>2.4.0</version>
</dependency>
<dependency>
    <groupId>org.springframework.data</groupId>
    <artifactId>spring-data-elasticsearch</artifactId>
    <version>2.0.4.RELEASE</version>
</dependency>

导入spring test和junit，编写测试用力需要进行测试。

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-test</artifactId>
    <version>4.3.3.RELEASE</version>
</dependency>
<dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>4.12</version>
</dependency>

导入slf4j-log4j日志包。

<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-log4j12</artifactId>
    <version>1.7.12</version>
</dependency>

创建applicationContext.xml和log4j.properties配置文件，在applicationContext.xml配置文件中引入spring data elasticsearch名称空间。

xmlns:elasticsearch="http://www.springframework.org/schema/data/elasticsearch"
xsi:schemaLocation="
    http://www.springframework.org/schema/data/elasticsearch
    http://www.springframework.org/schema/data/elasticsearch/spring-elasticsearch-1.0.xsd"

log4j配置文件

### direct log messages to stdout ###
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

### direct messages to file mylog.log ###
log4j.appender.file=org.apache.log4j.FileAppender
log4j.appender.file.File=c:/mylog.log
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

### set log levels - for more verbose logging change 'info' to 'debug' ###

log4j.rootLogger=info, stdout

创建domain,dao,service包
编写dao，继承ElasticSearchRepository接口

public interface ArticleRepository extends ElasticsearchRepository<Article, Integer> { }

配置applicationContext.xml，扫描dao包自动创建dao的实现。

<!-- 扫描dao包  自动创建实现 -->
<elasticsearch:repositories base-package="cn.niwotaxuexiba.dao" />

编写service

@Service
public class ArticleServiceImpl implements ArticleService {
    @Autowired
    private ArticleRepository articleRepository;
    public void save(Article article){
        articleRepository.save(article);
    }
}

配置applicationContext.xml，扫描service包

<!-- 扫描service包 -->
<context:component-scan base-package="cn.niwotaxuexiba.service" />

配置applicationContext.xml连接elasticsearch.

<!-- 配置elasticsearch连接 -->
<elasticsearch:transport-client id="client" cluster-nodes="localhost:9300"/>
<!-- spring data elasticsearch DAO必须依赖elasticsearchTemplate -->
<bean id="elasticsearchTemplate" class="org.springframework.data.elasticsearch.core.ElasticsearchTemplate">
    <constructor-arg name="client" ref="client" />
</bean>

在使用spring data elasticsearch创建索引和映射时，需要将索引和映射信息配置在实体类上面。
@Document文档对象（索引信息、文档类型）
@Id文档主键，是唯一标识
@Field每个文档的字段配置（类型、是否分词、是否存储、分词器）

@Document(indexName = "blog3",type="article")
public class Article {
    @Id
    @Field(index=FieldIndex.not_analyzed,store=true,type=FieldType.Integer)
    private Integer id;
    @Field(index=FieldIndex.analyzed,analyzer="ik",store=true,searchAnalyzer="ik",type=FieldType.String)
    private String title;
    @Field(index=FieldIndex.analyzed,analyzer="ik",store=true,searchAnalyzer="ik",type=FieldType.String)
    private String content;
}

通过ElasticsearchTemplate创建索引和添加映射

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations="classpath:applicationContext.xml")
public class ArticleServiceImplTest {
    @Autowired
    private ArticleService articleService;
    @Autowired
    private Client client;
    @Autowired
    private ElasticsearchTemplate elasticsearchTemplate;
    @Test
    public void createIndex() {
        elasticsearchTemplate.createIndex(Article.class);
        elasticsearchTemplate.putMapping(Article.class);
    }
}

spring data search CRUD操作：
CrudRepository提供增删改查save/delete/findAll/findOne的方法；
PagingAndSortingRepository提供分页和排序的方法。

@Service
public class ArticleServiceImpl implements ArticleService {
    @Autowired
    private ArticleRepository articleRepository;
    @Override
    public void save(Article article){
        articleRepository.save(article);
    }
    @Override
    public void delete(Article article) {
        // TODO Auto-generated method stub
        articleRepository.delete(article);
    }
    @Override
    public Article findOne(Integer id) {
        // TODO Auto-generated method stub
        return articleRepository.findOne(id);
    }
    @Override
    public Iterable<Article> findAll() {
        // TODO Auto-generated method stub
        return articleRepository.findAll();
    }
}

查询标题的方法
service

@Override
public List<Article> findByTitle(String title) {
    // TODO Auto-generated method stub
    return articleRepository.findByTitle(title);
}

dao

public interface ArticleRepository extends ElasticsearchRepository<Article, Integer> {

    List<Article> findByTitle(String title);
}

分页条件查询，需要在查询方法中，传入Pageable对象。
service

public Page<Article> findByTitle(String title, Pageable pageable) {
    // TODO Auto-generated method stub
    return articleRepository.findByTitle(title,pageable);
}

dao

public interface ArticleRepository extends ElasticsearchRepository<Article, Integer> {

    Page<Article> findByTitle(String title, Pageable pageable);

}