非常简单的elasticsearch增删改查操作

步骤如下

1 Maven进行jar包管理

pom文件

 <properties>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.elasticsearch</groupId>
            <artifactId>elasticsearch</artifactId>
            <version>5.6.8</version>
        </dependency>
        <dependency>
            <groupId>org.elasticsearch.client</groupId>
            <artifactId>transport</artifactId>
            <version>5.6.8</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.7.24</version>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-to-slf4j</artifactId>
            <version>2.9.1</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-simple</artifactId>
            <version>1.7.21</version>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.12</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>2.8.1</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.8.1</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-annotations</artifactId>
            <version>2.8.1</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-elasticsearch</artifactId>
            <version>3.0.5.RELEASE</version>
            <exclusions>
                <exclusion>
                    <groupId>org.elasticsearch.plugin</groupId>
                    <artifactId>transport-netty4-client</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>5.0.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-commons</artifactId>
            <version>2.0.5.RELEASE</version>
        </dependency>
    </dependencies>

2 配置springData的applicationContext.xml

（1）客户端：es集群名字，es集群包含的节点

（2）包扫描器：对定义的接口进行扫描，使用该接口调用springData提供的增删改查方法

（3）模板对象：springData提供了对es操作的模板

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:elasticsearch="http://www.springframework.org/schema/data/elasticsearch"
       xsi:schemaLocation=" http://www.springframework.org/schema/beans
                            http://www.springframework.org/schema/beans/spring-beans.xsd
                            http://www.springframework.org/schema/context
                            http://www.springframework.org/schema/context/spring-context.xsd
                            http://www.springframework.org/schema/data/elasticsearch
                            http://www.springframework.org/schema/data/elasticsearch/spring-elasticsearch-1.0.xsd
                          ">
    <!--客户端对象-->
    <elasticsearch:transport-client id="esClient" cluster-name="my-elasticsearch"
                                    cluster-nodes="127.0.0.1:9301,127.0.0.1:9302,127.0.0.1:9303"/>
    <!--包扫描器-->
    <elasticsearch:repositories base-package="com.itheima.repositories"/>
    <!--模板对象-->
    <bean id="elasticsearchTemplate" class="org.springframework.data.elasticsearch.core.ElasticsearchTemplate">
        <constructor-arg name="client" ref="esClient"></constructor-arg>
    </bean>
</beans>

3  定义文档

包括索引库，映射，文档，域

@Document(indexName = "sdes_blog", type = "article")
public class Article {
    @Id
    private long id;
    @Field(type = FieldType.Long, store = true)
    private String aid;
    @Field(type = FieldType.text, store = true, analyzer = "ik_smart")
    private String title;
    @Field(type = FieldType.text, store = true, analyzer = "ik_smart")
    private String content;

4 定义接口

接口不用任何注解也能被扫描到，因为它继承自ElasticsearchRepository

public interface ArticleRespository extends ElasticsearchRepository<Article, Long> {
}

5 增删改查操作

使用Spring提供的测试方法，需要注入接口代理对象以及模板对象

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class SpringDataElasticSearchTest {
    @Autowired
    private ArticleRespository articleRespository;
    @Autowired
    private ElasticsearchTemplate template;

（1）创建索引库

 public void createIndex() throws Exception {
        template.createIndex(Article.class);
    }

（2）插入记录

    public void addDocument() throws Exception {
        for (int i = 10; i < 20; i++) {
            Article article = new Article();
            article.setId(i);
            article.setAid("0" + i);
            article.setTitle("裁员200人后，他为何把自己也裁了？互联网HR自曝裁员内幕");
            article.setContent("上海一家互联网公司的HR柯文，裁掉两百人后，把自己也裁掉了。");
            articleRespository.save(article);
        }

    }

查看

 （3）删除记录

   public void deleteDocumentById() throws Exception {
        articleRespository.deleteById(1l);
    }

（4）修改记录

修改是先删除，再添加

    public void updateDocumentById() throws Exception {
        Article article = new Article();
        article.setId(0);
        article.setAid("01");
        article.setTitle("修改第" + article.getAid() + "条记录");
        article.setContent("修改第" + article.getAid() + "条记录的内容");
        articleRespository.save(article);
    }

（5）查询记录

    //查询全部
    public void findAll() throws Exception {
        Iterable<Article> articles = articleRespository.findAll();
        articles.forEach(article -> System.out.println(article));
    }

    //根据id查询
    public void findById() throws Exception {
        Optional<Article> optional = articleRespository.findById(1l);
        Article article = optional.get();
        System.out.println(article);
    }

（6）自定义查询

完全按照springData的格式写，不需要写额外的代码

public interface ArticleRespository extends ElasticsearchRepository<Article, Long> {
    List<Article> findByTitle(String title);
    List<Article> findByTitleOrContent(String title,String content);
    List<Article> findByTitleOrContent(String title, String content, Pageable pageable);
}

    //根据title查询
    public void findByTitle() throws Exception {
        List<Article> list = articleRespository.findByTitle("制裁");
        list.stream().forEach(article -> System.out.println(article));
    }

    //带有分页的查询
    public void findByTitleOrContent() throws Exception {
        PageRequest pageable = PageRequest.of(0, 20);
        List<Article> list = articleRespository.findByTitleOrContent("制裁", "互联网公司", pageable);
        list.stream().forEach(article -> System.out.println(article));
    }

（7）原生查询

使用自定义的查询，查询语句是and的形式，而且是有序的。使用下面的自定义查询，虽然包含关键词，但是查询不出任何结果。因为它顺序和索引库中词的顺序不一致。

    public void findByTitle() throws Exception {
        List<Article> list = articleRespository.findByTitle("伊朗被美国制裁");
        list.stream().forEach(article -> System.out.println(article));
    }

使用原生查询，词的顺序是可以不一致的。

    public void testNativeSearchQuery() throws Exception {
        NativeSearchQuery query = new NativeSearchQueryBuilder()
                .withQuery(QueryBuilders.queryStringQuery("伊朗被美国制裁").defaultField("title"))
                .withPageable(PageRequest.of(0, 5))
                .build();
        List<Article> list = template.queryForList(query, Article.class);
        list.stream().forEach(article -> System.out.println(article));
    }