一、ElasticSearch介绍
分布式高可用，例如将一个系统部署在一台服务器上面，某一天崩溃了，该系统就无法使用了，但是当分布式部署到多台服务器上面之后，其中几个服务器崩溃掉了，但是不会影响整体的运作，从而实现高可用。
二、ElasticSearch项目集成
1、build.gradle添加es依赖和jna依赖，application.properties配置文件添加es服务地址和连接超时时间
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dependencies {
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compile('org.springframework.boot:spring-boot-starter-web')
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compile('org.springframework.boot:spring-boot-starter-thymeleaf')
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compile('org.springframework.boot:spring-boot-starter-data-jpa')
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compile('org.springframework.boot:spring-boot-starter-data-elasticsearch')
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runtime('com.h2database:h2:1.4.196')
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testCompile('org.springframework.boot:spring-boot-starter-test')
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compile('mysql:mysql-connector-java:6.0.5')
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compile('net.java.dev.jna:jna:4.5.1')
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}
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#elasticSearch服务地址
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spring.data.elasticsearch.cluster-nodes=localhost:9300
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#设置连接超时时间
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spring.data.elasticsearch.properties.transport.tcp.connect_timeout=120s
2、下载elasticsearch-6.3.0，解压到d:盘下，打开D:\elasticsearch-6.3.0\bin ，点击elasticsearch.bat 启动es服务，
3、编写测试用例
新建EsBlog实体类
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*/
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@Document(indexName="blog",type="blog")
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public class EsBlog implements Serializable {
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/**
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*
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*/
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private static final long serialVersionUID = 159383211493905568L;
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@Id
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private String id;
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private String title;
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private String summary;
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private String content;
编写接口继承ElasticsearchRepository
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public interface EsBlogRepository extends ElasticsearchRepository<EsBlog, String> {
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/**
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* 分页查询博客去重
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* @param title
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* @param summary
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* @param content
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* @param pageable
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* @return Page<EsBlog>
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*/
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Page<EsBlog> findDistinctEsBlogByTitleContainingOrSummaryContainingOrContentContaining(String title,String summary,String content,Pageable pageable);
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}
编写测试test代码
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@RunWith(SpringRunner.class)
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@SpringBootTest
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public class EsBlogRepositoryTest {
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@Autowired
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private EsBlogRepository esBlogRepository;
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public void initRepositoryData() {
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/**
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* 删除所有数据
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*/
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esBlogRepository.deleteAll();
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/**
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* 初始化三个blog
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*/
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esBlogRepository.save(new EsBlog("1", "段", "段朝旭"));
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esBlogRepository.save(new EsBlog("2", "朝", "段朝旭"));
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esBlogRepository.save(new EsBlog("3", "旭", "段朝旭"));
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}
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/**
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* 分页查询博客去重
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*
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* @param title
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* @param summary
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* @param content
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* @param pageable
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* @return Page<EsBlog>
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*/
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@Test
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public void findDistinctEsBlogByTitleContaingOrSummaryContaingOrContentContaing() {
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initRepositoryData();
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Pageable pageable = PageRequest.of(0, 20);
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Page<EsBlog> page = esBlogRepository
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.findDistinctEsBlogByTitleContainingOrSummaryContainingOrContentContaining("1", "旭", "王", pageable);
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System.out.println(page.getTotalElements());
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for (EsBlog blog : page.getContent()) {
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System.out.println(blog);
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}
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}
运行测试代码之后看到控制台打印出
说明执行成功。
4、编写controller层
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@RestController
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@RequestMapping("/blog")
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public class EsBlogController {
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@Autowired
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private EsBlogRepository esBlogRepository;
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@GetMapping
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public List<EsBlog> list(@RequestParam(value="title")String title,
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@RequestParam(value="summary")String summary,
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@RequestParam(value="content")String content,
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@RequestParam(value="pageIndex",defaultValue="0")int pageIndex,
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@RequestParam(value="pageSize",defaultValue="10")int pageSize){
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Pageable pageable = PageRequest.of(pageIndex,pageSize);
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Page<EsBlog> page = esBlogRepository.findDistinctEsBlogByTitleContainingOrSummaryContainingOrContentContaining(title,summary,content,pageable);
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return page.getContent();
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}
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}
访问如图所示的地址，可看到返回的json格式数据
文章来源: blog.csdn.net，作者：血煞风雨城2018，版权归原作者所有，如需转载，请联系作者。
原文链接：blog.csdn.net/qq_31905135/article/details/80856073