1.客戶端client構建

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package com.pz998.app.service.utils;
import static org.elasticsearch.common.settings.Settings.settingsBuilder;
import java.net.InetSocketAddress;
import org.elasticsearch.client.Client; 
import org.elasticsearch.client.transport.TransportClient; 
import org.elasticsearch.common.settings.Settings; 
import org.elasticsearch.common.transport.InetSocketTransportAddress;
public class SearchHelp {
private static TransportClient client = null;
public static Client getSearchClient() { 
   if(client!=null){ 
     return client; 
   } 

   Settings setting = settingsBuilder() 
   //集群名稱     
   .put("cluster.name", "es-cluster") 
   .put("client.transport.sniff", true) 
   .put("client.transport.ignore_cluster_name", false) 
   .put("client.transport.ping_timeout", "5s") 
   .put("client.transport.nodes_sampler_interval", "5s") 
   .build(); 

   client = TransportClient.builder().settings(setting).build(); 
   ((TransportClient) client).addTransportAddress(new InetSocketTransportAddress(new InetSocketAddress("10.3.32.83", 9300))); 
   return client; 
}}

2.多字段檢索

public SearchResultVo queryDiseaseOrDoctor(SearchParam searchParam,Client client){   
   Integer from = searchParam.getFrom()==null?0:searchParam.getFrom(); 
   Integer size = searchParam.getPageSize()==null?0:searchParam.getPageSize(); 
   MultiSearchResponse response = client.prepareMultiSearch() 
       //搜索疾病索引 
       .add(client.prepareSearch(DISEASE_INDEX)// 檢索的目錄 
         .setSearchType(SearchType.DEFAULT)// Query type         
         .setQuery(QueryBuilders.disMaxQuery() 
              .add(QueryBuilders.matchQuery("name", searchParam.getKeyword())) 
              .add(QueryBuilders.matchQuery("intro", searchParam.getKeyword()) 
             ))   
         .addHighlightedField("name") 
         .addHighlightedField("intro") 

         .setHighlighterPreTags(FIELD_HIGHLIGHT_PRE_TAG) 
         .setHighlighterPostTags(FIELD_HIGHLIGHT_POST_TAG) 
         .setFrom(from).setSize(size).setExplain(true)) 
       //搜索醫生索引 
       .add(client.prepareSearch(DOCTOR_INDEX)// 檢索的目錄 
           .setSearchType(SearchType.DEFAULT)// Query type         
           .setQuery(QueryBuilders.disMaxQuery() 
                .add(QueryBuilders.matchQuery("name", searchParam.getKeyword())) 
                .add(QueryBuilders.matchQuery("disease_tag", searchParam.getKeyword())) 
                //城市

//                  .add(QueryBuilders.matchQuery("city", searchParam.getCity()))  
)   
.addHighlightedField("name")
.addHighlightedField("disease_tag")
.setHighlighterPreTags(FIELD_HIGHLIGHT_PRE_TAG)
.setHighlighterPostTags(FIELD_HIGHLIGHT_POST_TAG)
.setFrom(from).setSize(size).setExplain(true))
.execute().actionGet();// 執行

       SearchResultVo searchResultVo = new SearchResultVo(); 
       List<BdDiseaseRpc> diseaseList = new ArrayList<BdDiseaseRpc>(); 
       List<BdDoctorRpc> doctorList = new ArrayList<BdDoctorRpc>(); 
       if(response.getResponses() != null) {  
         MultiSearchResponse.Item diseaseItem = response.getResponses().length>0?(response.getResponses())[0]:null; 
         MultiSearchResponse.Item doctorItem = response.getResponses().length>1?(response.getResponses())[1]:null; 

         if(diseaseItem!=null){ 
           SearchResponse diseasResp = diseaseItem.getResponse(); 
           System.out.println("命中疾病條數: " + diseasResp.getHits().getTotalHits()); 

           searchResultVo.setDiseaseTotal(diseasResp.getHits().getTotalHits()); 
           for (SearchHit hits : diseasResp.getHits().getHits()) {       
             Map<String, Object> sourceAsMap = hits.sourceAsMap(); 
             //獲取對應的高亮域 
             Map<String, HighlightField> result = hits.highlightFields();  

             //從設定的高亮域中取得指定域 
             HighlightField highlightFieldText = result.get("name");  
             String code = (String)sourceAsMap.get("code"); 
             HighlightField introField = result.get("intro"); 

             String name = getHighlightFieldText(highlightFieldText); 
             name = StringUtils.isEmpty(name)?(String)sourceAsMap.get("name"):name; 
             String intro = getHighlightFieldText(introField); 
             intro = StringUtils.isEmpty(intro)?(String)sourceAsMap.get("intro"):intro; 

             BdDiseaseRpc bdDiseaseRpc = new BdDiseaseRpc(); 
             bdDiseaseRpc.setName(name); 
             bdDiseaseRpc.setCode(code); 
             bdDiseaseRpc.setIntro(intro);           
             diseaseList.add(bdDiseaseRpc); 
           } 

           searchResultVo.setDiseaseList(diseaseList); 
         } 

         if(doctorItem!=null){ 
           SearchResponse doctorResp = doctorItem.getResponse(); 
           System.out.println("命中醫生條數: " + doctorResp.getHits().getTotalHits()); 
           searchResultVo.setDoctorTotal(doctorResp.getHits().getTotalHits()); 
           for (SearchHit hits : doctorResp.getHits().getHits()) {       
             Map<String, Object> sourceAsMap = hits.sourceAsMap(); 
             //獲取對應的高亮域 
             Map<String, HighlightField> result = hits.highlightFields();  
             //從設定的高亮域中取得指定域 
             HighlightField highlightFieldText = result.get("name");  
             String code = (String)sourceAsMap.get("code"); 
             HighlightField diseaseTagField = result.get("disease_tag"); 

             String name = getHighlightFieldText(highlightFieldText); 
             name = StringUtils.isEmpty(name)?(String)sourceAsMap.get("name"):name; 

             String diseaseTag = getHighlightFieldText(diseaseTagField); 
             diseaseTag = StringUtils.isEmpty(diseaseTag)?(String)sourceAsMap.get("disease_tag"):diseaseTag; 

             BdDoctorRpc bdDoctorRpc = new BdDoctorRpc(); 
             bdDoctorRpc.setName(name); 
             bdDoctorRpc.setCode(code); 
             bdDoctorRpc.setDiseaseTag(diseaseTag); 
             doctorList.add(bdDoctorRpc); 
           } 
           searchResultVo.setDoctorList(doctorList); 
         } 

       } 

   return searchResultVo; 
}

以上代碼搜索疾病信息中的名字與簡介,同時搜索了疾病和醫生兩個索引

設置分頁查詢

.setFrom(from).setSize(size).setExplain(true))

3高亮信息

設置高亮顯示信息首尾包裹的標簽

public static final String FIELD_HIGHLIGHT_PRE_TAG = "<span style=\"color:red\">"; 

public static final String FIELD_HIGHLIGHT_POST_TAG = "</span>";

       .setHighlighterPreTags(FIELD_HIGHLIGHT_PRE_TAG) 
       .setHighlighterPostTags(FIELD_HIGHLIGHT_POST_TAG)

獲取高亮顯示的結果信息

//從設定的高亮域中取得指定域
HighlightField highlightFieldText = result.get("name");  
String code = (String)sourceAsMap.get("code");
HighlightField introField = result.get("intro");

     String highlight = getHighlightFieldText(highlightFieldText); 
     String intro = getHighlightFieldText(introField);

public String getHighlightFieldText(HighlightField highlightFieldText){ 
   if(highlightFieldText==null){ 
     return ""; 
   } 
   //取得定義的高亮標簽 
   Text[] higlightTexts =  highlightFieldText.fragments(); 

   //為title串值增加自定義的高亮標簽 
   String higlightText = "";  
   for(Text text : higlightTexts){   
     higlightText += text;  
   } 
   return higlightText; 
}

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本文標題：elasticsearch中java客戶端api的使用方法-創新互聯
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