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/

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