Elasticsearch结合spring的使用

一、spring项目能创建ES连接

  public static void main(String[] args) throws Exception {

        // 创建ES客户端
        RestHighLevelClient esClient = new RestHighLevelClient(
                RestClient.builder(new HttpHost("localhost", 9200, "http"))
        );
        // 关闭ES客户端
        esClient.close();
    }

二、向ES中新建索引并新增一条数据

public static void main(String[] args) throws Exception {

        RestHighLevelClient esClient = new RestHighLevelClient(
                RestClient.builder(new HttpHost("localhost", 9200, "http"))
        );

        // 插入数据
        IndexRequest request = new IndexRequest();
        request.index("user").id("101");

        User user = new User();
        user.setName("张三");
        user.setAge(25);
        user.setSex("男");

        // 向ES插入数据，必须将数据转换位JSON格式
        //这里使用的GSON，将Object对象转化为json字符串
        ObjectMapper mapper = new ObjectMapper();
        String userJson = mapper.writevalueAsString(user);
        request.source(userJson, XContentType.JSON);

        IndexResponse response = esClient.index(request, RequestOptions.DEFAULT);

        System.out.println(response.getResult());
         // 关闭ES客户端
        esClient.close();
    }

三、向ES中批量新增多条数据

 public static void main(String[] args) throws Exception {

        RestHighLevelClient esClient = new RestHighLevelClient(
                RestClient.builder(new HttpHost("localhost", 9200, "http"))
        );

        // 批量插入数据
        BulkRequest request = new BulkRequest();

        request.add(new IndexRequest().index("user").id("102").source(XContentType.JSON, "name", "李四", "age",30,"sex","女"));
        request.add(new IndexRequest().index("user").id("103").source(XContentType.JSON, "name", "王五", "age",35,"sex","男"));
        request.add(new IndexRequest().index("user").id("104").source(XContentType.JSON, "name", "赵六", "age",40,"sex","女"));
        request.add(new IndexRequest().index("user").id("105").source(XContentType.JSON, "name", "陈七", "age",55,"sex","男"));
   
        BulkResponse response = esClient.bulk(request, RequestOptions.DEFAULT);
      
        System.out.println(response.getItems());
         // 关闭ES客户端
        esClient.close();
    }

四、修改ES中索引中的数据信息

public static void main(String[] args) throws Exception {

        RestHighLevelClient esClient = new RestHighLevelClient(
                RestClient.builder(new HttpHost("localhost", 9200, "http"))
        );
        // 修改数据
        UpdateRequest request = new UpdateRequest();
        request.index("user").id("101");
        request.doc(XContentType.JSON, "sex", "女");
        UpdateResponse response = esClient.update(request, RequestOptions.DEFAULT);
        System.out.println(response.getResult());
         // 关闭ES客户端
        esClient.close();
    }

五、删除ES中索引中的数据

 public static void main(String[] args) throws Exception {

        RestHighLevelClient esClient = new RestHighLevelClient(
                RestClient.builder(new HttpHost("localhost", 9200, "http"))
        );
        DeleteRequest request = new DeleteRequest();
        request.index("user").id("101");
        DeleteResponse response = esClient.delete(request, RequestOptions.DEFAULT);
        System.out.println(response.toString());
         // 关闭ES客户端
        esClient.close();
    }

六、批量删除ES中索引的相关数据

 public static void main(String[] args) throws Exception {

        RestHighLevelClient esClient = new RestHighLevelClient(
                RestClient.builder(new HttpHost("localhost", 9200, "http"))
        );
        // 批量删除数据
        BulkRequest request = new BulkRequest();

        request.add(new DeleteRequest().index("user").id("101"));
        request.add(new DeleteRequest().index("user").id("102"));
        request.add(new DeleteRequest().index("user").id("103"));

        BulkResponse response = esClient.bulk(request, RequestOptions.DEFAULT);
       
        System.out.println(response.getItems());
         // 关闭ES客户端
        esClient.close();
    }

七、获取ES中索引的所有数据

   public static void main(String[] args) throws Exception {

        RestHighLevelClient esClient = new RestHighLevelClient(
                RestClient.builder(new HttpHost("localhost", 9200, "http"))
        );
        // 1. 查询索引的所有数据
        SearchRequest request = new SearchRequest();
        request.indices("user");
        // 构造查询条件
        SearchSourceBuilder builder = new SearchSourceBuilder();
        builder.query(QueryBuilders.matchAllQuery());
        request.source(builder);
        SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);

        SearchHits hits = response.getHits();
        System.out.println(hits.getTotalHits());
        Iterator iterator = hits.iterator();
        while (iterator.hasNext()) {
            SearchHit hit = iterator.next();
            System.out.println(hit.getSourceAsString());
        }
         // 关闭ES客户端
        esClient.close();
    }

八、根据条件查询ES中索引的数据

        // 2. 条件查询 : termQuery
  SearchRequest request = new SearchRequest();
        request.indices("user");
        request.source(new SearchSourceBuilder().query(QueryBuilders.termQuery("age", 30)));
        SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);

        SearchHits hits = response.getHits();
        System.out.println(hits.getTotalHits());
        for ( SearchHit hit : hits ) {
            System.out.println(hit.getSourceAsString());
        }

九、 根据分页查询ES中索引的数据

    // 3. 分页查询
   SearchRequest request = new SearchRequest();
        request.indices("user");

        SearchSourceBuilder builder = new SearchSourceBuilder().query(QueryBuilders.matchAllQuery());
        // (当前页码-1)*每页显示数据条数
        builder.from(2);
        builder.size(2);
        request.source(builder);
        SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);
        SearchHits hits = response.getHits();
        System.out.println(hits.getTotalHits());
        for ( SearchHit hit : hits ) {
            System.out.println(hit.getSourceAsString());
        }

十、根据模糊查询ES中索引的数据

   // 4. 模糊查询
SearchRequest request = new SearchRequest();
request.indices("user");

SearchSourceBuilder builder = new SearchSourceBuilder();
builder.query(QueryBuilders.fuzzyQuery("name", "王五").fuzziness(Fuzziness.TWO));

request.source(builder);
SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);
SearchHits hits = response.getHits();
System.out.println(hits.getTotalHits());
for ( SearchHit hit : hits ) {
    System.out.println(hit.getSourceAsString());
}