首先在pom.xml里面导入es相关依赖：

  


 


      org.elasticsearch


      elasticsearch


      7.2.0


    

















    


      org.elasticsearch.client


      elasticsearch-rest-high-level-client


      7.2.0


    


    


      org.elasticsearch.client


      elasticsearch-rest-client


      7.2.0


    


    

代码如下：

import com.alibaba.fastjson.JSON; import com.alibaba.fastjson.JSONObject; import org.apache.http.HttpHost; //import org.elasticsearch.action.get.GetRequest; //import org.elasticsearch.action.get.GetResponse; import org.elasticsearch.action.admin.indices.delete.DeleteIndexRequest; import org.elasticsearch.action.delete.DeleteRequest; import org.elasticsearch.action.index.IndexRequest; import org.elasticsearch.action.index.IndexResponse; import org.elasticsearch.action.search.SearchRequest; import org.elasticsearch.action.search.SearchResponse; import org.elasticsearch.action.update.UpdateRequest; import org.elasticsearch.client.RequestOptions; import org.elasticsearch.client.RestClient; import org.elasticsearch.client.RestHighLevelClient; import org.elasticsearch.index.query.BoolQueryBuilder; //import org.elasticsearch.index.query.QueryBuilder; import org.elasticsearch.index.query.QueryBuilders; import org.elasticsearch.search.SearchHit; import org.elasticsearch.search.builder.SearchSourceBuilder; import java.io.IOException; import java.util.*;

public class Demo1 {    private static RestHighLevelClient client;    private static final String ip="170.60.140.120";    private static final int port=9200;

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


    client=new RestHighLevelClient(RestClient.builder(


            new HttpHost(ip, port, "http")));


            


//      indexincrement();


        indexsearch();


//      indexdelete();


//      indexupdate();






        client.close();


    }

创建索引

 private static void indexincrement() throws Exception{


        HashMap jsonmap = new HashMap<>();


        jsonmap.put("name","王五");


        jsonmap.put("age",32);


        IndexRequest indexRequest = new IndexRequest("post").source(jsonmap);


        IndexResponse indexResponse = client.index(indexRequest, RequestOptions.DEFAULT);


        System.out.println("indexresponse = "+indexResponse);


        System.out.println("indexResponse.status() = "+indexResponse.status());






}

删除索引

 private static void indexdelete() throws Exception{


         //第一种，按索引id删除某个文档。


/*      DeleteRequest deleteRequest = new DeleteRequest("post", "m56EDXIBK5FuWnazQHHa");


        client.delete(deleteRequest,RequestOptions.DEFAULT);*/






       //第二种，一次性删除整个索引


/*       DeleteIndexRequest deleteIndexRequest = new DeleteIndexRequest("post");


         client.indices().delete(deleteIndexRequest,RequestOptions.DEFAULT);  */






        //第三种，先按条件查询出某范围内所有Id，再一个一个删除


        BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();


        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();


        sourceBuilder.query(boolQueryBuilder);


        sourceBuilder.size(100);


        SearchRequest searchRequest = new SearchRequest().indices("post");


        searchRequest.source(sourceBuilder);


        SearchResponse response1 = client.search(searchRequest, RequestOptions.DEFAULT);


        SearchHit[] hits = response1.getHits().getHits();


        for(SearchHit hit:hits){


            String id = hit.getId();


            DeleteRequest deleteRequest = new DeleteRequest("post", id);


            client.delete(deleteRequest,RequestOptions.DEFAULT);


        }

更新文档 ，（以map方式为例）

private static void indexupdate() throws Exception{


    UpdateRequest updateRequest = new UpdateRequest("post","kCfJHHIBCUDx2GUCB0Dk");


    HashMap jsonmap = new HashMap<>();


    jsonmap.put("name","赵六");


    jsonmap.put("age",16);


    updateRequest.doc(jsonmap);


    client.update(updateRequest,RequestOptions.DEFAULT);


}

查询索引

  private static void indexsearch(Connection conn) throws Exception{


/*      第一种，按某个id号查询方式


        GetRequest getRequest = new GetRequest("risklog", "rpBmNnIB76i_tBrAwvlC");


        GetResponse getResponse = client.get(getRequest, RequestOptions.DEFAULT);*/


        


/*


    第二种，按条件查询整个索引表方式


*/


    BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();


    SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();


    sourceBuilder.query(boolQueryBuilder);


 //这里设置查询7万条数据


    sourceBuilder.size(70000);






//        SearchRequest searchRequest=new SearchRequest();


        SearchRequest searchRequest = new SearchRequest().indices("middleware_apache_server_access");


        searchRequest.source(sourceBuilder);


        SearchResponse response1 = client.search(searchRequest, RequestOptions.DEFAULT);


        List list = new ArrayList<>();


        response1.getHits().forEach(item ->            list.add(JSON.parseObject(item.getSourceAsString())));


        System.out.println("list.size() = "+list.size());


//        Iterator iterator = list.iterator();


        for(int i=0;i


            JSONObject jsonObject = list.get(i);


            System.out.println("jsonObject = "+jsonObject);   


        }


  }

}