十、ELASTICSEARCH JAVAAPI-索引管理

 

版本

 
不同版本的java api和 elasticsearch之间存在兼容风险，当前教程使用的 java api用于链接 Elastic Search 6.2，请确保版本一致，否则会出现无法预计的错误

TestElasticSearch4J

 
代码很简单，无非就是获取连接，然后调用对应的API进行 增加和删除。
需要指出来的是，通过 RestHighLevelClient 查看索引是否存在在当前 java api版本(6.2) 里是不提供了，使用的是通过捕捉异常来判断是否存在。
jar 包什么的在右上角的可运行项目里已经包含了，不再赘述
 
 
 
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package com.how2java;
 
import java.io.IOException;
 
import org.apache.http.HttpHost;
import org.elasticsearch.ElasticsearchStatusException;
import org.elasticsearch.action.admin.indices.create.CreateIndexRequest;
import org.elasticsearch.action.admin.indices.delete.DeleteIndexRequest;
import org.elasticsearch.action.admin.indices.open.OpenIndexRequest;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestHighLevelClient;
 
public class TestElasticSearch4J {
    private static RestHighLevelClient client = new RestHighLevelClient(
            RestClient.builder(
                    new HttpHost("localhost", 9200, "http")
            ));
     
    public static void main(String[] args) throws IOException {
 
        String indexName = "how2java";
         
        if(!checkExistIndex(indexName)){
            createIndex(indexName);        
        }
 
        if(checkExistIndex(indexName)){
            deleteIndex(indexName);
        }
        checkExistIndex(indexName);
        client.close();
    }
 
    private static boolean checkExistIndex(String indexName) throws IOException {
        boolean result =true;
        try {
 
            OpenIndexRequest openIndexRequest = new OpenIndexRequest(indexName);
            client.indices().open(openIndexRequest).isAcknowledged();
 
        } catch (ElasticsearchStatusException ex) {
            String m = "Elasticsearch exception [type=index_not_found_exception, reason=no such index]";
            if (m.equals(ex.getMessage())) {
                result = false;
            }
        }
        if(result)
            System.out.println("索引:" +indexName + " 是存在的");
        else
            System.out.println("索引:" +indexName + " 不存在");
         
        return result;
         
    }
 
    private static void deleteIndex(String indexName) throws IOException {
        DeleteIndexRequest request = new DeleteIndexRequest(indexName);
        client.indices().delete(request);
        System.out.println("删除了索引："+indexName);
 
    }
 
    private static void createIndex(String indexName) throws IOException {
        // TODO Auto-generated method stub
        CreateIndexRequest request = new CreateIndexRequest(indexName);
        client.indices().create(request);
        System.out.println("创建了索引："+indexName);
    }
      
}
实例下载路径：elasticsearch4j .rar ： http://download.how2j.cn/1700/elasticsearch4j.rar

posted on 2019-01-04 13:18  我是司  阅读(938)  评论(0)    收藏  举报

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