ES6.6.2 使用小结 - ES工具类使用

深藏阁楼爱情的钟 2022-02-28 03:42 357阅读 0赞

1.以下是封装了ES常用的基本方法，可以用来做一些简单的测试。

如：获取ES的TransportClient/IndicesAdminClient、判定索引是否存在、创建索引、设置mapping、删除索引、插入文档。

package com.bas.util;
    
    import org.elasticsearch.action.admin.indices.create.CreateIndexResponse;
    import org.elasticsearch.action.admin.indices.delete.DeleteIndexResponse;
    import org.elasticsearch.action.admin.indices.exists.indices.IndicesExistsResponse;
    import org.elasticsearch.action.delete.DeleteResponse;
    import org.elasticsearch.action.get.GetResponse;
    import org.elasticsearch.action.index.IndexRequest;
    import org.elasticsearch.action.index.IndexResponse;
    import org.elasticsearch.action.update.UpdateRequest;
    import org.elasticsearch.action.update.UpdateResponse;
    import org.elasticsearch.client.IndicesAdminClient;
    import org.elasticsearch.client.transport.TransportClient;
    import org.elasticsearch.common.settings.Settings;
    import org.elasticsearch.common.transport.TransportAddress;
    import org.elasticsearch.common.xcontent.XContentBuilder;
    import org.elasticsearch.common.xcontent.XContentType;
    import org.elasticsearch.transport.client.PreBuiltTransportClient;
    
    import java.net.InetAddress;
    import java.net.UnknownHostException;
    import java.util.concurrent.ExecutionException;
    
    /**
     * ES工具类
     */
    public class ESUtil {
        //集群名,默认值elasticsearch
        private static final String CLUSTER_NAME = "TestCluster";
        //ES集群中某个节点
        private static final String HOSTNAME = "localhost";
        //连接端口号
        private static final int TCP_PORT = 9300;
        //构建Settings对象
        private static Settings settings = Settings.builder().put("cluster.name", CLUSTER_NAME).build();
        //TransportClient对象，用于连接ES集群
        private static volatile TransportClient client;
    
        /**
         * 同步synchronized(*.class)代码块的作用和synchronized static方法作用一样,
         * 对当前对应的*.class进行持锁,static方法和.class一样都是锁的该类本身,同一个监听器
         *
         * @return
         * @throws UnknownHostException
         */
        public static TransportClient getClient() {
            if (client == null) {
                synchronized (TransportClient.class) {
                    try {
                        client = new PreBuiltTransportClient(settings)
                                .addTransportAddress(new TransportAddress(InetAddress.getByName(HOSTNAME), TCP_PORT));
                    } catch (UnknownHostException e) {
                        e.printStackTrace();
                    }
                }
            }
            return client;
        }
    
        /**
         * 获取索引管理的IndicesAdminClient
         */
        public static IndicesAdminClient getAdminClient() {
            return getClient().admin().indices();
        }
    
        /**
         * 判定索引是否存在
         *
         * @param indexName
         * @return
         */
        public static boolean isExists(String indexName) {
            IndicesExistsResponse response = getAdminClient().prepareExists(indexName).get();
            return response.isExists() ? true : false;
        }
    
        /**
         * 创建索引
         *
         * @param indexName
         * @return
         */
        public static boolean createIndex(String indexName) {
            CreateIndexResponse createIndexResponse = getAdminClient()
                    .prepareCreate(indexName.toLowerCase())
                    .get();
            return createIndexResponse.isAcknowledged() ? true : false;
        }
    
        /**
         * 创建索引
         *
         * @param indexName 索引名
         * @param shards    分片数
         * @param replicas  副本数
         * @return
         */
        public static boolean createIndex(String indexName, int shards, int replicas) {
            Settings settings = Settings.builder()
                    .put("index.number_of_shards", shards)
                    .put("index.number_of_replicas", replicas)
                    .build();
            CreateIndexResponse createIndexResponse = getAdminClient()
                    .prepareCreate(indexName.toLowerCase())
                    .setSettings(settings)
                    .execute().actionGet();
            return createIndexResponse.isAcknowledged() ? true : false;
        }
    
        /**
         * 为索引indexName设置mapping
         *
         * @param indexName
         * @param typeName
         * @param mapping
         */
        public static void setMapping(String indexName, String typeName, String mapping) {
            getAdminClient().preparePutMapping(indexName)
                    .setType(typeName)
                    .setSource(mapping, XContentType.JSON)
                    .get();
        }
    
        /**
         * 删除索引
         *
         * @param indexName
         * @return
         */
        public static boolean deleteIndex(String indexName) {
            DeleteIndexResponse deleteResponse = getAdminClient()
                    .prepareDelete(indexName.toLowerCase())
                    .execute()
                    .actionGet();
            return deleteResponse.isAcknowledged() ? true : false;
        }
    
        /**
         * 插入文档
         *
         * @param indexName 索引名
         * @param type      类型
         * @param doc       XContentBuilder
         */
        public static void insertDocument(String indexName, String type, XContentBuilder doc) {
            IndexResponse response = getClient().prepareIndex(indexName, type)
                    .setSource(doc)
                    .get();
            System.out.println(response.status());
        }
    
        /**
         * 插入文档
         *
         * @param indexName 索引名
         * @param type      类型
         * @param json      Json格式串
         */
        public static void insertDocument(String indexName, String type, String json) {
            IndexResponse response = getClient().prepareIndex(indexName, type)
                    .setSource(json, XContentType.JSON)
                    .get();
            System.out.println(response.status());
        }
    
        /**
         * 查询文档
         *
         * @param indexName 索引名
         * @param type      类型
         * @param id        文档id
         * @return
         */
        public static String selectDocument(String indexName, String type, String id) {
            GetResponse response = getClient().prepareGet(indexName, type, id).get();
            System.out.println(response.isExists());
            System.out.println(response.getIndex());
            System.out.println(response.getType());
            System.out.println(response.getId());
            System.out.println(response.getVersion());
            return response.getSourceAsString();
        }
    
        /**
         * 删除文档
         *
         * @param indexName 索引名
         * @param type      类型
         * @param id        文档id
         */
        public static void deleteDocument(String indexName, String type, String id) {
            DeleteResponse response = getClient().prepareDelete(indexName, type, id).get();
            //删除成功返回OK，否则返回NOT_FOUND
            System.out.println(response.status());
            //返回被删除文档的类型
            System.out.println(response.getType());
            //返回被删除文档的ID
            System.out.println(response.getId());
            //返回被删除文档的版本信息
            System.out.println(response.getVersion());
        }
    
        /**
         * 修改文档
         *
         * @param indexName 索引名
         * @param type      类型
         * @param id        文档id
         * @param doc       Json
         * @throws ExecutionException
         * @throws InterruptedException
         */
        public static void updateDocument(String indexName, String type, String id, XContentBuilder doc) throws ExecutionException, InterruptedException {
            UpdateRequest request = new UpdateRequest();
            request.index(indexName).type(type).id(id).doc(doc);
            UpdateResponse response = getClient().update(request).get();
            //更新成功返回OK，否则返回NOT_FOUND
            System.out.println(response.status());
            //返回被更新文档的类型
            System.out.println(response.getType());
            //返回被更新文档的ID
            System.out.println(response.getId());
            //返回被更新文档的版本信息
            System.out.println(response.getVersion());
        }
    
        /**
         * 更新数据，存在文档则使用updateDoc，不存在则使用insertDoc
         *
         * @param indexName 索引名
         * @param type      类型
         * @param id        文档id
         * @param insertDoc 新文档
         * @param updateDoc 更新文档
         */
        public static void upsertDocument(String indexName, String type, String id, XContentBuilder insertDoc, XContentBuilder updateDoc) throws ExecutionException, InterruptedException {
            IndexRequest indexRequest = new IndexRequest(indexName, type, id)
                    .source(insertDoc);
            UpdateRequest updateRequest = new UpdateRequest(indexName, type, id)
                    .doc(updateDoc).upsert(indexRequest);
            UpdateResponse response = getClient().update(updateRequest).get();
            //upsert操作成功返回OK，否则返回NOT_FOUND
            System.out.println(response.status());
            //返回被操作文档的类型
            System.out.println(response.getType());
            //返回被操作文档的ID
            System.out.println(response.getId());
            //返回被操作文档的版本信息
            System.out.println(response.getVersion());
        }
    
    }

2.结合ESUtil.java ，来做一些测试。首先是创建type为"blog"的Mapping，运行CreateDemo.test()：

package com.bas.demo;
    
    import com.bas.util.ESUtil;
    import org.elasticsearch.action.admin.indices.create.CreateIndexResponse;
    import org.elasticsearch.client.IndicesAdminClient;
    import org.elasticsearch.client.transport.TransportClient;
    import org.elasticsearch.common.settings.Settings;
    import org.elasticsearch.common.transport.TransportAddress;
    import org.elasticsearch.transport.client.PreBuiltTransportClient;
    import org.junit.jupiter.api.Test;
    
    import java.net.InetAddress;
    import java.net.UnknownHostException;
    
    import org.elasticsearch.common.xcontent.XContentBuilder;
    import java.io.IOException;
    
    import static org.elasticsearch.common.xcontent.XContentFactory.jsonBuilder;
    
    public class CreateDemo {
    
        /**
         * 创建Index
         * @param args
         * @throws UnknownHostException
         */
        public static void main(String[] args) throws UnknownHostException {
            //1.设置集群名称
            Settings settings = Settings.builder().put("cluster.name", "TestCluster").build();
            //2.创建client
            TransportClient client = new PreBuiltTransportClient(settings)
                    .addTransportAddress(new TransportAddress(InetAddress.getByName("localhost"), 9300));
            //3.获取IndicesAdminClient对象
            IndicesAdminClient indicesAdminClient = client.admin().indices();
            //4.创建索引
            CreateIndexResponse ciReponse=indicesAdminClient.prepareCreate("app_account").get();
            System.out.println(ciReponse.isAcknowledged());
        }
    
        /**
         * 创建Mapping
         */
        @Test
        public void test(){
            try {
                XContentBuilder builder = jsonBuilder()
                        .startObject()
                        .startObject("properties")
                        .startObject("id")
                        .field("type", "long")
                        .endObject()
                        .startObject("title")
                        .field("type", "text")
                        .field("analyzer", "ik_max_word")
                        .field("search_analyzer", "ik_max_word")
                        .field("boost", 2)
                        .endObject()
                        .startObject("content")
                        .field("type", "text")
                        .field("analyzer", "ik_max_word")
                        .field("search_analyzer", "ik_max_word")
                        .endObject()
                        .startObject("postdate")
                        .field("type", "date")
                        .field("format", "yyyy-MM-dd HH:mm:ss")
                        .endObject()
                        .startObject("url")
                        .field("type", "keyword")
                        .endObject()
                        .endObject()
                        .endObject();
                System.out.println(builder.string());
                ESUtil.setMapping("app_account", "blog", builder.string());
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

、3.接下来，以两种方式插入文档到blog：

package com.bas.demo;
    
    import com.bas.util.ESUtil;
    import org.elasticsearch.common.xcontent.XContentBuilder;
    
    import java.io.IOException;
    
    import static org.elasticsearch.common.xcontent.XContentFactory.jsonBuilder;
    
    public class InsertDemo {
        public static void main(String[] args) throws IOException {
            // 方式一
            String json = "{" +
                    "\"id\":\"1\"," +
                    "\"title\":\"Java連接ES\"," +
                    "\"content\":\"abcdefg。\"," +
                    "\"postdate\":\"2019-03-24 14:38:00\"," +
                    "\"url\":\"bas.com\"" +
                    "}";
            System.out.println(json);
    
            ESUtil.insertDocument("app_account", "blog", json);
    
            // 方式二
            XContentBuilder doc = jsonBuilder()
                    .startObject()
                    .field("id","2")
                    .field("title","Java插入数据到ES")
                    .field("content","abcedfasdasd")
                    .field("postdate","2019-03-24 14:38:00")
                    .field("url","bas.com")
                    .endObject();
            ESUtil.insertDocument("app_account", "blog", doc);
    
        }
    }

结果如图：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBU3RyaXZlcg_size_16_color_FFFFFF_t_70][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBU3RyaXZlcg_size_16_color_FFFFFF_t_70]: /images/20220228/795c4526ec2d441d9f187e7de5568ec2.png