SpringBoot集成elasticseach入门实战

elasticseach作为一个高度可拓展的开源全文搜索和分析引擎，可用于快速地对大数据进行存储，搜索和分析。
主要有以下几个特点：分布式，高可用，异步写入，多API，面向文档
elasticseach的核心概念：近实时，集群，节点（保存数据），索引，分片（将索引分片），副本（分片可设置多个副本）
首先要下载elasticseach，然后运行它，点击bin文件里的elasricseach.bat，出现started说明安装成功：

接下来在我们的SpringBoot中集成elasticseach
首先要添加依赖：
pom.xml

<dependency>            <groupId> org.springframework.boot </groupId>            <artifactId> spring-boot-starter-data-elasticsearch </artifactId>        </dependency>

修改配置文件
application.yml

spring:   data:        elasticsearch:             cluster-name: #默认为elasticsearch            cluster-nodes: #配置es节点信息，逗号分隔，如果没有指定，则启动ClientNode            properties:                path:                  logs: ./elasticsearch/log #elasticsearch日志存储目录                  data: ./elasticsearch/data #elasticsearch数据存储目录

这里的cluster-name和cluster-nodes可不配置，默认值就行

这样就引入springboot中elasticseach的依赖了，接下来要通过一个博客小例子来运用它，需要以下几个步骤：
1.编写文档类：EsBlog
2.资源库 ：EsBlogRepository
3.控制器：BlogController
4.测试用例：EsBlogRepository

EsBlog

@Document(indexName = "blog",type = "blog")public class EsBlog implements Serializable {    private static final long serialVersionUID = 1L;    @Id    private String id;    private String title;    private String summary;    private String content;    protected EsBlog(){}    public EsBlog( String title, String summary, String content) {        this.title = title;        this.summary = summary;        this.content = content;    }    //省略getset方法}

默认情况下，添加@Document注解会对实体中的所有属性建立索引

EsBlogRepository

import com.example.oldbig.domain.EsBlog;import org.springframework.data.domain.Page;import org.springframework.data.domain.Pageable;import org.springframework.data.elasticsearch.repository.ElasticsearchRepository;public interface EsBlogRepository extends ElasticsearchRepository<EsBlog,String> {    /*    * 分页查询博客（去重功能）    * 继承ElasticsearchRepository，泛型的参数分别是实体类型和主键类型    * */    Page<EsBlog> findDistinctEsBlogByTitleContainingOrSummaryContainingOrContentContaining(String title,String summary,String content,Pageable pageable);}

BlogController类

@RestController@RequestMapping("/blogsTest")public class BlogCotrollerTest {    @Autowired    private EsBlogRepository esBlogRepository;    @GetMapping    public List<EsBlog> list (@RequestParam(value = "title") String title,                              @RequestParam(value = "summary") String summary,                              @RequestParam(value = "content") String content,                              @RequestParam(value = "pageIndex",defaultValue = "0") int pageIndex,                              @RequestParam(value = "pageSize",defaultValue = "10") int pageSize ) {        Pageable pageable = new PageRequest(pageIndex, pageSize);        Page<EsBlog> page = esBlogRepository.findDistinctEsBlogByTitleContainingOrSummaryContainingOrContentContaining                ( title, summary, content, pageable);        return  page.getContent();    }}

测试用例：EsBlogRepository

@RunWith(SpringRunner.class)@SpringBootTestpublic class EsBlogRepositoryTest {    @Autowired    private EsBlogRepository esBlogRepository;    @Before    public void initRepository(){        //清除所有数据//        esBlogRepository.deleteAll();        esBlogRepository.save(new EsBlog("登鹳雀楼","王之涣",                "白日依山尽,黄河入海流,欲穷千里目,更上一层楼"));        esBlogRepository.save(new EsBlog("相思","王维",                "红豆生南国，春来发几枝。愿君多采撷，此物最相思。"));        esBlogRepository.save(new EsBlog("静夜思","李白",                "床前明月光，疑是地上霜。举头望明月，低头思故乡。"));    }    @Test    public void findDistinctEsBlogByTitleContainingOrSummaryContainingOrContentContaining() throws Exception {        org.springframework.data.domain.Pageable pageable = new PageRequest(0,20);        String title = "思";        String summary = "相思";        String content = "相思";        Page<EsBlog> page = esBlogRepository.findDistinctEsBlogByTitleContainingOrSummaryContainingOrContentContaining(title,summary,content,pageable);//        assertThat(page.getTotalElements()).isEqualTo(4);        System.out.println("----------------start-------------");        for (EsBlog blog :page.getContent()){            System.out.println(blog.toString());        }        System.out.println("--------------end--------------------");    }}

在运行测试用例之前要启动我们的elasricseach，下载elasricseach后运行bin文件里的elasricseach.bat
运行测试用例即可初始化文档库：添加了三首古诗，这时候运行项目，并且在浏览器输入http://127.0.0.1:8080/blogsTest?title=%E6%80%9D&content=%E7%9B%B8%E6%80%9D&summary=%E7%9B%B8%E6%80%9D
便可获取文档库中搜索结果：
说明搜索成功，可以尝试其他的搜索关键字进行搜索