elasticsearch2.2之javaApi

原创
2016/05/31 13:09
阅读数 7.7K

前言:elasticsearch虽然自带rest接口,但是在真正使用过程中可能更多的是通过不同编程语言的客户端进行交互。

因为代码里有或多或少的注释,所以直接贴代码:

package elasticsearcha;

import com.alibaba.fastjson.JSON;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import entity.User;
import org.elasticsearch.action.delete.DeleteResponse;
import org.elasticsearch.action.get.GetResponse;
import org.elasticsearch.action.get.MultiGetItemResponse;
import org.elasticsearch.action.get.MultiGetResponse;
import org.elasticsearch.action.index.IndexResponse;
import org.elasticsearch.action.search.MultiSearchResponse;
import org.elasticsearch.action.search.SearchRequestBuilder;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.action.search.SearchType;
import org.elasticsearch.action.update.UpdateResponse;
import org.elasticsearch.client.Client;
import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.common.transport.InetSocketTransportAddress;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.SearchHit;
import org.junit.Test;
import java.net.InetAddress;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

import static org.elasticsearch.common.xcontent.XContentFactory.jsonBuilder;

/**
 * Created by wangnian on 2016/5/29.
 */
public class EsTest {

    Client client = getClient("192.168.1.55");

    //创建客户端
    public Client getClient(String host) {
        try {
            Client client = TransportClient.builder().build()
                    .addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName(host), 9300));
            return client;
        } catch (Exception ex) {
            System.out.println(ex);
        }
        return null;
    }

    /**
     * 将对象通过jackson.databind转换成byte[]
     * 注意一下date类型需要格式化处理  默认是 时间戳
     *
     * @return
     */
    public byte[] convertByteArray(Object obj) {
        ObjectMapper mapper = new ObjectMapper(); // create once, reuse
        try {
            byte[] json = mapper.writeValueAsBytes(obj);
            return json;
        } catch (JsonProcessingException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 将对象通过JSONtoString转换成JSON字符串
     * 使用fastjson 格式化注解  在属性上加入 @JSONField(format="yyyy-MM-dd HH:mm:ss")
     *
     * @return
     */
    public String jsonStr(Object obj) {
        return JSON.toJSONString(obj);
    }

    /**
     * 增删改查
     *
     * @throws Exception
     */
    @Test
    public void test() throws Exception {
        Map<String, Object> json = new HashMap<String, Object>();
        json.put("name", "wangnian11");
        json.put("postDate", new Date());
        json.put("message", "trying out Elasticsearch");

        User user = new User();
        user.setId(2);
        user.setName("更新第一条");
        user.setPostDate(new Date());
        user.setMessage("这是一个测试的数据");

        IndexResponse response = client.prepareIndex("index", "user", user.getId().toString())//参数说明: 索引,类型 ,_id
                .setSource(jsonStr(user))//setSource可以传以上map string  byte[] 几种方式
                .get();
        boolean created = response.isCreated();
        System.out.println("创建一条记录:" + created);

        //删除_id为1的类型
        DeleteResponse response2 = client.prepareDelete("index", "user", "2").get();
        System.out.println("删除一条数据:" + response2.isFound());

        //更新
        UpdateResponse updateResponse = client.prepareUpdate("index", "user", "1").setDoc(jsonBuilder()
                .startObject()
                .field("name", "王念")
                .endObject())
                .get();
        System.out.println("更新一条数据:" + updateResponse.isCreated());


        //获取_id为1的类型
        GetResponse response1 = client.prepareGet("index", "user", "1").get();
        response1.getSourceAsMap();//获取值转换成map
        System.out.println("查询一条数据:" + JSON.toJSON(response1.getSourceAsMap()));
    }

    @Test
    public void test2() {
        //查询多个id的值
        MultiGetResponse multiGetItemResponses = client.prepareMultiGet()
                .add("index", "user", "1")
                .add("index", "user", "2", "3", "4")
                .get();
        for (MultiGetItemResponse itemResponse : multiGetItemResponses) {
            GetResponse response = itemResponse.getResponse();
            if (response.isExists()) {
                String json = response.getSourceAsString();
                System.out.println(json);
            }
        }
        //搜索
        SearchResponse response = client.prepareSearch("index")//可以同时搜索多个索引prepareSearch("index","index2")
                .setTypes("user")//可以同时搜索多个类型
                .setSearchType(SearchType.DFS_QUERY_THEN_FETCH)
                .setQuery(QueryBuilders.termQuery("name", "张三"))                 // Query
                .setPostFilter(QueryBuilders.rangeQuery("age").from(12).to(18))     // Filter
                .setFrom(0).setSize(2).setExplain(true)
                .execute()
                .actionGet();
        forSearchResponse(response);
        System.out.println("总共查询到有:" + response.getHits().getTotalHits());


        //多查询结果
        SearchRequestBuilder srb1 = client
                .prepareSearch().setQuery(QueryBuilders.queryStringQuery("张三")).setSize(1);
        SearchRequestBuilder srb2 = client
                .prepareSearch().setQuery(QueryBuilders.matchQuery("name", "张三")).setSize(1);

        MultiSearchResponse sr = client.prepareMultiSearch()
                .add(srb1)
                .add(srb2)
                .execute().actionGet();

        long nbHits = 0;
        for (MultiSearchResponse.Item item : sr.getResponses()) {
            SearchResponse response1 = item.getResponse();
            forSearchResponse(response1);
            nbHits += response1.getHits().getTotalHits();
        }
        System.out.println("多查询总共查询到有:" + nbHits);
    }

    public void forSearchResponse(SearchResponse response) {
        for (SearchHit hit1 : response.getHits()) {
            Map<String, Object> source1 = hit1.getSource();
            if (!source1.isEmpty()) {
                for (Iterator<Map.Entry<String, Object>> it = source1.entrySet().iterator(); it.hasNext(); ) {
                    Map.Entry<String, Object> entry = it.next();
                    System.out.println(entry.getKey() + "=======" + entry.getValue());
                }
            }
        }
    }
}

博客地址:http://my.oschina.net/wangnian

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qmt
2
2016/08/22 19:33
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