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  • java操作elasticsearch实现前缀查询、wildcard、fuzzy模糊查询、ids查询

    1、前缀查询(prefix)

    //prefix前缀查询
            @Test
            public void test15() 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));
                //prefixQuery 第一个参数为字段名,后面是以zhao开头的条件进行查询
                QueryBuilder builder = QueryBuilders.prefixQuery("name", "zhao");
                SearchResponse response = client.prepareSearch("lib3").setQuery(builder).get();
                SearchHits hits = response.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));
                    }
                }
            }

    2、wildcard模糊查询

    //wildcard模糊查询
        @Test
        public void test16() 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));
            //wildcardQuery模糊查询
            QueryBuilder builder = QueryBuilders.wildcardQuery("name", "zhao*");
            SearchResponse response = client.prepareSearch("lib3").setQuery(builder).get();
            SearchHits hits = response.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));
            }
        }
    }        

    3、fuzzy模糊查询

      说明:fuzzy才是实现真正的模糊查询,我们输入的字符可以是个大概,他可以根据我们输入的文字大概进行匹配查询,具体可看文章中的解释和代码,注意与wildcard模糊查询的区别

    //fuzzy模糊查询(输入的值输入个大概也可以查询出来)
            @Test
            public void test17() 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));
                //fuzzyQuery模糊查询
                QueryBuilder builder = QueryBuilders.fuzzyQuery("name", "chagge");
                SearchResponse response = client.prepareSearch("lib3").setQuery(builder).get();
                SearchHits hits = response.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));
                }
            }
        }            
        
            //typeQuery类型查询
            @Test
            public void test18() 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));
                //typeQuery类型查询
                QueryBuilder builder = QueryBuilders.typeQuery("blog");
                SearchResponse response = client.prepareSearch("index1").setQuery(builder).get();
                SearchHits hits = response.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));
                }
            }
        }        

    4、ids查询

      说明:根据多个id值进行查询

    //idsQuery id查询(可以同时根据多个id进行查询)
            @Test
            public void test19() 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));
                //idsQuery id查询
                QueryBuilder builder = QueryBuilders.idsQuery("1","2");
                SearchResponse response = client.prepareSearch("lib3").setQuery(builder).get();
                SearchHits hits = response.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实现聚合查询。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!

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  • 原文地址:https://www.cnblogs.com/chenyuanbo/p/10296845.html
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