SpringBoot整合Elasticsearch并实现CRUD操作

 配置准备

在build.gradle文件中添加如下依赖：

  compile "org.elasticsearch.client:transport:5.5.2"
  compile "org.elasticsearch:elasticsearch:5.5.2"
  //es 5.x的内部使用的 apache log4日志
  compile "org.apache.logging.log4j:log4j-core:2.7"
  compile "org.apache.logging.log4j:log4j-api:2.7"

这里spring boot使用的是1.5.4版，前些天spring boot 2正式版已经发布，spring boot 2新特性中有一条是支持kotlin，spring boot 2基于spring 5，spring 5也支持了koltin，所以spring也开始支持函数式编程。

关于版本兼容

配置访问Elasticsearch的客户端，这里都使用原生es JavaAPI。

@Configuration
public class ElasticSearchConfig {
  @Bean(name = "client")
  public TransportClient getClient() {
    InetSocketTransportAddress node = null;
    try {
      node = new InetSocketTransportAddress(InetAddress.getByName("192.168.124.128"), 9300);
    } catch (UnknownHostException e) {
      e.printStackTrace();
    }
    Settings settings = Settings.builder().put("cluster.name", "my-es").build();
    TransportClient client = new PreBuiltTransportClient(settings);
    client.addTransportAddress(node);
    return client;
  }
}

SocketTransport端口可以使用http://ip:9200/_nodes方式查看，这里默认使用的是9300端口。

CRUD操作

新建一个控制器ElasticSearchController，使用原生的es JavaAPI。

@RestController
public class ElasticSearchController {
  @Autowired
  TransportClient client;
}

在控制器中添加增删查改方法

增加操作

@PostMapping("add/book/novel")
  public ResponseEntity add(
      @RequestParam(name = "title") String title, @RequestParam(name = "authro") String author,
      @RequestParam(name = "word_count") int wordCount,
      @RequestParam(name = "publish_date") @DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")Date publishDate
      )
  {
    try {
      XContentBuilder content = XContentFactory.jsonBuilder().startObject()
          .field("title", title)
          .field("author", author)
          .field("word_count", wordCount)
          .field("publish_date", publishDate.getTime())
          .endObject();
      IndexResponse result = this.client.prepareIndex("book", "novel").setSource(content).get();
      return new ResponseEntity(result.getId(), HttpStatus.OK);
    } catch (IOException e) {
      e.printStackTrace();
      return new ResponseEntity(HttpStatus.INTERNAL_SERVER_ERROR);
    }
  }

删除操作

@DeleteMapping("/delete/book/novel")
  public ResponseEntity delete(@RequestParam(name = "id") String id)
  {
    DeleteResponse result = client.prepareDelete("book", "novel", id).get();
    return new ResponseEntity(result.getResult().toString(), HttpStatus.OK);
  }

查找操作

@GetMapping("/get/book/novel")
  public ResponseEntity get(@RequestParam(name = "id", defaultValue="") String id)
  {
    if (id.isEmpty())
    {
      return new ResponseEntity(HttpStatus.NOT_FOUND);
    }
    GetResponse result = this.client.prepareGet("book", "novel", id).get();
    if (!result.isExists())
    {
      return new ResponseEntity(HttpStatus.NOT_FOUND);
    }
    return new ResponseEntity(result.getSource(), HttpStatus.OK);
  }

更新操作

@PutMapping("/put/book/novel")
  public ResponseEntity update(@RequestParam(name = "id") String id, @RequestParam(name = "title", required = false) String title,
    @RequestParam(name = "author", required = false) String author
  )
  {
    try {
      XContentBuilder builder = XContentFactory.jsonBuilder().startObject();
      if (title!= null)
      {
        builder.field("title", title);
      }
      if (author != null)
      {
        builder.field("author", author);
      }
      builder.endObject();
      UpdateRequest updateRequest = new UpdateRequest("book", "novel", id);
      updateRequest.doc(builder);
      UpdateResponse result = client.update(updateRequest).get();
      return new ResponseEntity(result.getResult().toString(), HttpStatus.OK);
    } catch (Exception e) {
      e.printStackTrace();
      return new ResponseEntity(HttpStatus.INTERNAL_SERVER_ERROR);
    }
  }

复合查找

@GetMapping("/query/book/novel")
  public ResponseEntity query(@RequestParam(name = "author", required = false) String author,
                   @RequestParam(name = "title", required = false) String title,
                   @RequestParam(name = "gt_word_count", defaultValue = "0") int gtWordCount,
                   @RequestParam(name = "lt_word_count", required = false) Integer ltWordCount)
  {
    BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
    if (author != null)
    {
      boolQueryBuilder.must(QueryBuilders.matchQuery("author",author));
    }
    if (title != null)
    {
      boolQueryBuilder.must(QueryBuilders.matchQuery("title", title));
    }
    RangeQueryBuilder rangeQueryBuilder = QueryBuilders.rangeQuery("word_count").from(gtWordCount);
    if (ltWordCount != null && ltWordCount > 0)
    {
      rangeQueryBuilder.to(ltWordCount);
    }
    boolQueryBuilder.filter(rangeQueryBuilder);
    SearchRequestBuilder searchRequestBuilder = this.client.prepareSearch("book")
        .setTypes("novel")
        .setSearchType(SearchType.DFS_QUERY_THEN_FETCH)
        .setQuery(boolQueryBuilder)
        .setFrom(0)
        .setSize(10);
    System.out.println(searchRequestBuilder); //调试用
    SearchResponse response = searchRequestBuilder.get();
    List<Map<String, Object>> result = new ArrayList<>();
    for (SearchHit hit : response.getHits())
    {
      result.add(hit.getSource());
    }
    return new ResponseEntity(result, HttpStatus.OK);
  }

上面的代码组织的复合查询类似下面的Query DSL：

{
  "query":{
    "bool":{
      "must":[
        {"match":{"author":"张三"}},
        {"match":{"title":"Elasticsearch"}}
      ],
      "filter":[
        {"range":
          {"word_count":{
              "gt":"0",
              "lt":"3000"
            }
          }
        }
      ]
    }
  }
}

总结

以上所述是小编给大家介绍的SpringBoot整合Elasticsearch并实现CRUD操作，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对我们网站的支持！

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