Spring Boot整合ElasticSearch实战 - 第511篇

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这一节来看下在SpringBoot中如何集成ElasticSearch。

一、Spring Boot整合ElasticSearch

这里有一个版本的对应情况，最好对应上会比较好，不然会出现莫名其妙的问题。

https://docs.spring.io/spring-data/elasticsearch/docs/current/reference/html/#new-features.5-1-0

1.1 创建项目

根据相应的版本，选择相应的Spring Boot版本，这里选择的是3.1.4版本。

1.2 添加依赖

在pom.xml文件添加依赖：

<dependencies>    <dependency>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-web</artifactId>    </dependency>
    <dependency>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-data-elasticsearch</artifactId>    </dependency>    <dependency>        <groupId>org.projectlombok</groupId>        <artifactId>lombok</artifactId>    </dependency>    <dependency>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-test</artifactId>        <scope>test</scope>    </dependency></dependencies>

1.3 添加配置

在配置文件application.properties中添加配置：

spring.elasticsearch.uris = http://localhost:9200spring.elasticsearch.connection-timeout = 3s

1.4 创建实体

创建实体，使用@Field注解，添加字段在ES中的类型以及使用的分词器：

@Data@AllArgsConstructor@Document(indexName = "employees")public class Employee {    @Id    private Long id;    @Field(type= FieldType.Keyword)    private String name;    private int sex;    private int age;    @Field(type= FieldType.Text,analyzer="ik_max_word")    private String address;    private String remark;}

1.5实现ElasticsearchRepository

该接口是框架封装的用于操作Elastsearch的高级接口：

@Repositorypublic interface EmployeeRepository extends ElasticsearchRepository<Employee, Long> {    List<Employee> findByName(String name);}

1.6测试

@AutowiredEmployeeRepository employeeRepository;
@Testvoid test() {    Employee employee = new Employee(1L,"悟纤",1,32,"福建福州","love coding");    //插入文档    employeeRepository.save(employee);
    //根据id查询    Optional<Employee> result = employeeRepository.findById(1L);    System.out.println(String.valueOf(result.get()));
    //根据name查询    List<Employee> list = employeeRepository.findByName("悟纤");    System.out.println(list.get(0));}

1.7使用ElasticsearchTemplate

@Resourceprivate ElasticsearchTemplate elasticsearchTemplate;
@Testpublic void testCreateIndex(){    //创建索引    IndexOperations indexOperations = elasticsearchTemplate.indexOps(IndexCoordinates.of("employee_index"));    if (indexOperations.exists()) {        System.out.println("索引已经存在");    }else {        //创建索引        indexOperations.create();    }}@Testpublic void testDeleteIndex(){    //删除索引    IndexOperations indexOperations = elasticsearchTemplate.indexOps(IndexCoordinates.of("employee_index"));    indexOperations.delete();}
@Testpublic void testQueryDocument(){    NativeSearchQueryBuilder builder = new NativeSearchQueryBuilder();    //查询    //builder.withQuery(QueryBuilders.matchQuery("address","公园"));    // 设置分页信息    builder.withPageable(PageRequest.of(0, 5));    // 设置排序    //builder.withSort(SortBuilders.fieldSort("age").order(SortOrder.DESC));
    SearchHits<Employee> search = elasticsearchTemplate.search(builder.build(), Employee.class);    List<SearchHit<Employee>> searchHits = search.getSearchHits();    for (SearchHit hit: searchHits){        System.out.println("返回结果："+hit.toString());    }
}

@Testpublic void testInsertBatch() throws JsonProcessingException {    List<Employee> employees = new ArrayList<>();    employees.add(new Employee(2l,"张三",1,25,"广州天河公园","java developer"));    employees.add(new Employee(3l,"李四",1,28,"广州荔湾大厦","java assistant"));    employees.add(new Employee(4l,"小红",0,26,"广州白云山公园","php developer"));
    List<IndexQuery> queries = new ArrayList<>();    for (Employee employee : employees) {        IndexQuery indexQuery = new IndexQuery();        indexQuery.setId(employee.getId().toString());
        ObjectMapper mapper = new ObjectMapper();        String json = mapper.writeValueAsString(employee);        indexQuery.setSource(json);        queries.add(indexQuery);    }    //bulk批量插入    elasticsearchTemplate.bulkIndex(queries,Employee.class);}

基本的集成用起来害死很简单的，关键在如何在实际的项目中进行合理的使用，这个是需要在具体的实战中进行自我摸索和探究的。

Spring Boot整合ElasticSearch实战 - 第511篇

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