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  • Java连接Elasticsearch集群

    package cn.test;
    
    import java.net.InetAddress;
    import java.net.UnknownHostException;
    
    import org.elasticsearch.action.search.SearchResponse;
    import org.elasticsearch.action.search.SearchType;
    import org.elasticsearch.client.transport.TransportClient;
    import org.elasticsearch.common.settings.Settings;
    import org.elasticsearch.common.transport.InetSocketTransportAddress;
    import org.elasticsearch.index.query.QueryBuilders;
    import org.elasticsearch.search.SearchHit;
    public class ElkTest {
    //  private static final String CLUSTER_NAME = "cluster_name";  
        public static final String CLUSTER_NAME = "elasticsearch"; //实例名称
        private static final String IP = "127.0.0.1";  
         //private static final String IP = "192.168.0.29";  
        private static final int PORT = 9300;  //端口
        //1.设置集群名称:默认是elasticsearch,并设置client.transport.sniff为true,使客户端嗅探整个集群状态,把集群中的其他机器IP加入到客户端中  
        /* 
        //对ES1.6有效 
        private static Settings settings = ImmutableSettings 
                .settingsBuilder() 
                .put("cluster.name",CLUSTER_NAME) 
                .put("client.transport.sniff", true) 
                .build(); 
        */  
        //对ES2.0有效  
        private static Settings settings = Settings  
                .settingsBuilder()  
                .put("cluster.name",CLUSTER_NAME)  
                .put("client.transport.sniff", true)  
                .build();  
        //创建私有对象  
        private static TransportClient client;  
      
        //反射机制创建单例的TransportClient对象  ES1.6版本  
    //    static {  
    //        try {  
    //            Class<?> clazz = Class.forName(TransportClient.class.getName());  
    //            Constructor<?> constructor = clazz.getDeclaredConstructor(Settings.class);  
    //            constructor.setAccessible(true);  
    //            client = (TransportClient) constructor.newInstance(settings);  
    //            client.addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName(IP), PORT));  
    //        } catch (Exception e) {  
    //            e.printStackTrace();  
    //        }  
    //    }  
      
        //ES2.0版本  
        static {  
            try {  
                client = TransportClient.builder().settings(settings).build()  
                        .addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName(IP), PORT));  
            } catch (UnknownHostException e) {  
                e.printStackTrace();  
            }  
        }  
      
        //取得实例  
        public static synchronized TransportClient getTransportClient(){  
            return client;  
        }  
      
        //为集群添加新的节点  
        public static synchronized void addNode(String name){  
            try {  
                client.addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName(name),9300));  
            } catch (UnknownHostException e) {  
                e.printStackTrace();  
            }  
        }  
      
        //删除集群中的某个节点  
        public static synchronized void removeNode(String name){  
            try {  
                client.removeTransportAddress(new InetSocketTransportAddress(InetAddress.getByName(name),9300));  
            } catch (UnknownHostException e) {  
                e.printStackTrace();  
            }  
        }  
        public static void main(String args[]){
            String index="logstash-2016.02.16";    
            String type="logs"; 
            SearchResponse response=ElkTest.getTransportClient().prepareSearch(index)//设置要查询的索引(index)
            .setSearchType(SearchType.DFS_QUERY_THEN_FETCH)
            .setTypes(type)//设置type, 这个在建立索引的时候同时设置了, 或者可以使用head工具查看
            .setQuery(QueryBuilders.matchQuery("message", "Accept")) //在这里"message"是要查询的field,"Accept"是要查询的内容
            .setFrom(0)
            .setSize(10)
            .setExplain(true)
            .execute()
            .actionGet();
            for(SearchHit hit:response.getHits()){
                System.out.println(hit.getSourceAsString());
            }
        }  
    }
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  • 原文地址:https://www.cnblogs.com/skyblue/p/5216504.html
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