69、Java API初步使用_员工管理案例：基于Java对员工信息进行复杂的搜索操作

搜索需求：
（1）搜索职位中包含technique的员工
（2）同时要求age在30到40岁之间
（3）分页查询，查找第一页

1、在restful api中

GET /company/employee/_search
{
  "query": {
    "bool": {
      "must": [
        {
          "match": {
            "position": "technique"
          }
        }
      ],
      "filter": {
        "range": {
          "age": {
            "gte": 30,
            "lte": 40
          }
        }
      }
    }
  },
  "from": 0,
  "size": 1
}

2、在java api中

package com.roncoo.es.score.first;

import java.net.InetAddress;

import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.transport.InetSocketTransportAddress;
import org.elasticsearch.common.xcontent.XContentFactory;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.transport.client.PreBuiltTransportClient;

/**
 * 员工搜索应用程序
 * @author Administrator
 *
 */
public class EmployeeSearchApp {

    @SuppressWarnings({ "unchecked", "resource" })
    public static void main(String[] args) throws Exception {
        Settings settings = Settings.builder()
                .put("cluster.name", "elasticsearch")
                .build();
        
        TransportClient client = new PreBuiltTransportClient(settings)
                .addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("localhost"), 9300)); 
        
//      prepareData(client);
        executeSearch(client);
        
        client.close();
    
    }

    /**
     * 执行搜索操作
     * @param client
     */
    private static void executeSearch(TransportClient client) {
        SearchResponse response = client.prepareSearch("company")
                .setTypes("employee")
                .setQuery(QueryBuilders.matchQuery("position", "technique"))
                .setPostFilter(QueryBuilders.rangeQuery("age").from(30).to(40))
                .setFrom(0).setSize(1)
                .get();
        
        SearchHit[] searchHits = response.getHits().getHits();
        for(int i = 0; i < searchHits.length; i++) {
            System.out.println(searchHits[i].getSourceAsString()); 
        }
    }

    /**
     * 准备数据
     * @param client
     */
    private static void prepareData(TransportClient client) throws Exception {
        client.prepareIndex("company", "employee", "1") 
                .setSource(XContentFactory.jsonBuilder()
                        .startObject()
                            .field("name", "jack")
                            .field("age", 27)
                            .field("position", "technique software")
                            .field("country", "china")
                            .field("join_date", "2017-01-01")
                            .field("salary", 10000)
                        .endObject())
                .get();
        
        client.prepareIndex("company", "employee", "2") 
                .setSource(XContentFactory.jsonBuilder()
                        .startObject()
                            .field("name", "marry")
                            .field("age", 35)
                            .field("position", "technique manager")
                            .field("country", "china")
                            .field("join_date", "2017-01-01")
                            .field("salary", 12000)
                        .endObject())
                .get();
        
        client.prepareIndex("company", "employee", "3") 
        .setSource(XContentFactory.jsonBuilder()
                .startObject()
                    .field("name", "tom")
                    .field("age", 32)
                    .field("position", "senior technique software")
                    .field("country", "china")
                    .field("join_date", "2016-01-01")
                    .field("salary", 11000)
                .endObject())
        .get();
        
        client.prepareIndex("company", "employee", "4") 
        .setSource(XContentFactory.jsonBuilder()
                .startObject()
                    .field("name", "jen")
                    .field("age", 25)
                    .field("position", "junior finance")
                    .field("country", "usa")
                    .field("join_date", "2016-01-01")
                    .field("salary", 7000)
                .endObject())
        .get();
        
        client.prepareIndex("company", "employee", "5") 
        .setSource(XContentFactory.jsonBuilder()
                .startObject()
                    .field("name", "mike")
                    .field("age", 37)
                    .field("position", "finance manager")
                    .field("country", "usa")
                    .field("join_date", "2015-01-01")
                    .field("salary", 15000)
                .endObject())
        .get();
    }
    
}