java操作elasticsearch实现查询删除和查询所有

Posted 2021-02-04 陈远波

后期博客本人都只给出代码，具体的说明在代码中也有注释。

　　1、查询删除

    //查询删除：将查询到的数据进行删除
    @Test
    public void test8() throws UnknownHostException {
        //1、指定es集群  cluster.name 是固定的key值，my-application是ES集群的名称
                Settings settings = Settings.builder().put("cluster.name", "my-application").build();
                //2.创建访问ES服务器的客户端
                TransportClient client = new PreBuiltTransportClient(settings)
                        //获取es主机中节点的ip地址及端口号(以下是单个节点案例)
                                        .addTransportAddress(new TransportAddress(InetAddress.getByName("192.168.1.94"), 9300));
                BulkByScrollResponse response = DeleteByQueryAction.INSTANCE
                        .newRequestBuilder(client)
                        .filter(QueryBuilders.matchQuery("title", "工厂"))
                        .source("index1")
                        .get();
                //删除并返回删除的个数
                long counts =response.getDeleted();
                System.out.println(counts);
    }

2、查询所有（match_all）

　　

//match_all查询所有
    @Test
    public void test9() throws UnknownHostException {
        //1、指定es集群  cluster.name 是固定的key值，my-application是ES集群的名称
        Settings settings = Settings.builder().put("cluster.name", "my-application").build();
        //2.创建访问ES服务器的客户端
        TransportClient client = new PreBuiltTransportClient(settings)
                //获取es主机中节点的ip地址及端口号(以下是单个节点案例)
                                .addTransportAddress(new TransportAddress(InetAddress.getByName("192.168.1.94"), 9300));
        QueryBuilder qBuilder = QueryBuilders.matchAllQuery();
        SearchResponse sResponse = client.prepareSearch("lib3")
                .setQuery(qBuilder)
                .get();
        SearchHits hits = sResponse.getHits();
        for(SearchHit hit:hits) {
            System.out.println(hit.getSourceAsString());
            //将获取的值转换成map的形式
            Map<String, Object> map = hit.getSourceAsMap();
            for(String key:map.keySet()) {
                System.out.println(key +" key对应的值为：" +map.get(key));
            }
        }

 

下一篇博客本人将书写java操作elasticsearch实现部分的条件查询（mutch/multimatch /term/terms/reange）。对后期博客感兴趣的朋友可以关注交流，转发请说明出处，本人的博客地址为：https://www.cnblogs.com/chenyuanbo/

技术在于交流！