[Java知识库]SpringBoot 集成Elasticsearch

?????????Elasticsearch是一个开源的高扩展的分布式全文检索引擎，它可以近乎实时的存储、检索数据；本身扩展性很好，可以扩展到上百台服务器，处理PB级别的数据。?
Elasticsearch也使用Java开发并使用Lucene作为其核心来实现所有索引和搜索的功能，但是它的目的是通过简单的RESTful API来隐藏Lucene的复杂性，从而让全文搜索变得简单。

1.安装Elasticsearch服务并进行相关配置，启动Elasticsearch服务

2. 安装Elasticsearch Header? 可视查看相关记录信息

3. pom.xml

<!-- elasticsearch -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
</dependency>
<dependency>
    <groupId>io.searchbox</groupId>
    <artifactId>jest</artifactId>
</dependency

1.application.yml

spring:
  elasticsearch:
    jest:
      uris:
        - http://124.222.108.169:9200
      read-timeout: 5000

2.StudentController

**
 *
 */
@Slf4j
@RestController
@RequestMapping("/student")
@Api(tags = "学生信息")
public class StudentController {
    @Autowired
    private StudentService studentService;


    @ApiOperation(value = "保存学生数据")
    @RequestMapping(path="/saveStudent")
    public JSONResult saveStudent( HttpServletRequest request, HttpServletResponse response){

        List<Student> list=new ArrayList<Student>();
        Student student=new Student( 1L,"张三",5);
        list.add(student);
        student=new Student( 2L,"王五",8);
        list.add(student);
        student=new Student( 4L,"赵六",10);
        list.add(student);
        studentService.saveEntity(list);
        return  JSONResult.ok();
    }


    @ApiOperation(value = "删除学生数据")
    @RequestMapping(path="/delStudent")
    public JSONResult delStudent( HttpServletRequest request, HttpServletResponse response){
       String id=request.getParameter("id");
        studentService.delEntity(id);
        return  JSONResult.ok();
    }



    @ApiOperation(value = "搜索")
    @RequestMapping(path="/searchStudent")
    public JSONResult searchStudent( HttpServletRequest request){
        List<Student>  result=studentService.searchEntity("张");
        return  JSONResult.ok(result);
    }


    /**
     * 创建索引
     * @param indexName
     * @throws Exception
     */
    @ApiOperation(value = "创建索引")
    @RequestMapping(path="/createIndex")
    public JSONResult createIndex(@RequestParam("indexName")String indexName) throws Exception{
        studentService.createIndex(indexName);
        return JSONResult.ok();
    }

    /**
     * 删除索引
     * @param indexName
     * @throws Exception
     */
    @ApiOperation(value = "刪除索引")
    @RequestMapping(path="/deleteIndex")
    public JSONResult deleteIndex(@RequestParam("indexName")String indexName) throws Exception{
        studentService.deleteIndex(indexName);
        return JSONResult.ok();
    }
}

3.StudentServiceImpl

@Service
public class StudentServiceImpl implements StudentService {

    private static final Logger LOGGER = LoggerFactory.getLogger(StudentServiceImpl.class);

    @Autowired
    private JestClient jestClient;

    @Override
    public void saveEntity(Student entity) {
        Index index = new Index.Builder(entity).index(Student.INDEX_NAME).type(Student.TYPE).build();
        try {
            jestClient.execute(index);
            LOGGER.info("插入完成");
        } catch (IOException e) {
            e.printStackTrace();
            LOGGER.error(e.getMessage());
        }
    }

    @Override
    public void delEntity(String id) {
        Delete index = new Delete.Builder(id).index(Student.INDEX_NAME).type(Student.TYPE).build();
        try {
            jestClient.execute(index);
            LOGGER.info("删除完成");
        } catch (IOException e) {
            e.printStackTrace();
            LOGGER.error(e.getMessage());
        }
    }




    @Override
    public void saveEntity(List<Student> entityList) {
        Bulk.Builder bulk = new Bulk.Builder();
        for(Student entity : entityList) {
            Index index = new Index.Builder(entity).id(String.valueOf(entity.getId())).index(Student.INDEX_NAME).type(Student.TYPE).build();
            bulk.addAction(index);
        }
        try {
            jestClient.execute(bulk.build());
            LOGGER.info("批量插入完成");
        } catch (IOException e) {
            e.printStackTrace();
            LOGGER.error(e.getMessage());
        }
    }

    /**
     * 在ES中搜索内容
     */
    @Override
    public List<Student> searchEntity(String searchContent){
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        searchSourceBuilder.query(QueryBuilders.matchQuery("studentName",searchContent));
        Search search = new Search.Builder(searchSourceBuilder.toString())
                .addIndex(Student.INDEX_NAME).addType(Student.TYPE).build();
        try {
            JestResult result = jestClient.execute(search);
            return result.getSourceAsObjectList(Student.class);
        } catch (IOException e) {
            LOGGER.error(e.getMessage());
            e.printStackTrace();
        }
        return null;
    }


    /**
     * 创建索引
     * @param indexName
     *
     */
    @Override
    public void createIndex(String indexName) {
        try{
            CreateIndex createIndex = new CreateIndex.Builder(indexName).build();
            JestResult result = jestClient.execute(createIndex);
            LOGGER.info("result",result.getJsonString());
        }catch (Exception e){
            LOGGER.error(e.getMessage());
            e.printStackTrace();
        }
    }

    /**
     * 删除索引
     * @param indexName
     *
     */
    @Override
    public void deleteIndex(String indexName) {
        try{
            DeleteIndex deleteIndex = new DeleteIndex.Builder(indexName).build();
            JestResult result = jestClient.execute(deleteIndex);
            LOGGER.info("result",result.getJsonString());
        }catch (Exception e){
            LOGGER.error(e.getMessage());
            e.printStackTrace();
        }

    }