java 连接操作Elasticsearch（一）

• 导入Elasticsearch依赖包

    <!-- Elasticsearch6.4.3 依赖 -->
        <dependency>
            <groupId>org.elasticsearch</groupId>
            <artifactId>elasticsearch</artifactId>
            <version>${elasticsearch.version}</version>
        </dependency>
        <dependency>
            <groupId>org.elasticsearch.client</groupId>
            <artifactId>transport</artifactId>
            <version>${elasticsearch.version}</version>
        </dependency>
        <dependency>
            <groupId>org.elasticsearch.plugin</groupId>
            <artifactId>transport-netty4-client</artifactId>
            <version>${elasticsearch.version}</version>
        </dependency>
        <dependency>
            <groupId>org.elasticsearch.client</groupId>
            <artifactId>elasticsearch-rest-high-level-client</artifactId>
            <version>${elasticsearch.version}</version>
        </dependency>

• properties配置文件

elasticsearch.ip=es库ip
elasticsearch.port=9300（es对外连接端口）
elasticsearch.cluster.name=elasticsearch
elasticsearch.shards=3
elasticsearch.replicas=1
elasticsearch.pool=3
elasticsearch.regenerateIndexEnabled=false
elasticsearch.syncDataEnabled=true
elasticsearch.sniff=true

 

• 获取连接

public static Connection getConn(){
        Properties properties = new Properties();
        // 使用ClassLoader加载properties配置文件生成对应的输入流
        InputStream in = ES_Utils.class.getClassLoader().getResourceAsStream("elasticsearch.properties");
        // 使用properties对象加载输入流
        try {
            properties.load(in);
        } catch (IOException e1) {
            e1.printStackTrace();
        }
        String url = properties.getProperty("postgresql.url");
        String driver = properties.getProperty("postgresql.driver");
        String user = properties.getProperty("postgresql.user");
        String password = properties.getProperty("postgresql.password");
        
        try {
            Class.forName(driver);
            conn = DriverManager.getConnection(url, user, password); //获取连接
        } catch (ClassNotFoundException e){
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        
        return conn;
    }    

• 获取单例客户端

public static TransportClient getSingleClient() {
        Properties properties = new Properties();
        // 使用ClassLoader加载properties配置文件生成对应的输入流
        InputStream in = ES_Utils.class.getClassLoader().getResourceAsStream("elasticsearch.properties");
        // 使用properties对象加载输入流
        try {
            properties.load(in);
        } catch (IOException e1) {
            e1.printStackTrace();
        }

        String host = properties.getProperty("elasticsearch.ip");
        String cluster_name = properties.getProperty("elasticsearch.cluster.name");
        int port = Integer.parseInt(properties.getProperty("elasticsearch.port"));
        
        /*
         * int shards =
         * Integer.parseInt(properties.getProperty("elasticsearch.shards")); int
         * replicas =
         * Integer.parseInt(properties.getProperty("elasticsearch.replicas"));
         * String sniff = properties.getProperty("elasticsearch.sniff");
         */

        if (client == null) {
            synchronized (TransportClient.class) {
            }
            if (client == null) {
                try {
                    /**
                     * 配置信息 client.transport.sniff 增加嗅探机制，找到ES集群
                     * thread_pool.search.size 增加线程池个数，暂时设为3
                     */
                    Settings esSetting = Settings.builder().put("cluster.name", cluster_name).build();
                    // 配置信息Settings自定义
                    client = new PreBuiltTransportClient(esSetting);
                    TransportAddress transportAddress = new TransportAddress(InetAddress.getByName(host), port);
                    client.addTransportAddress(transportAddress);
                } catch (Exception e) {
                    LOGGER.error("elasticsearch TransportClient create error!!!", e);
                }
            }
        }
        return client;
    }
    

• 获取es库客户端

@SuppressWarnings("resource")
    public static ElasticsearchClient getEsClient(){
        Properties properties = new Properties();
        // 使用ClassLoader加载properties配置文件生成对应的输入流
        InputStream in = ES_Utils.class.getClassLoader().getResourceAsStream("elasticsearch.properties");
        // 使用properties对象加载输入流
        try {
            properties.load(in);
        } catch (IOException e1) {
            e1.printStackTrace();
        }

        String host = properties.getProperty("elasticsearch.ip");
        int port = Integer.parseInt(properties.getProperty("elasticsearch.port"));

        try {
            es_client = new PreBuiltTransportClient(Settings.EMPTY)
                    .addTransportAddress(new TransportAddress(InetAddress.getByName(host), port));
        } catch (Exception e) {
            e.printStackTrace();
        }
        
        return es_client;
    }