1. client building
​

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() 
    //Cluster name         
    .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. Multi-Field Retrieval
​

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() 
            //Search Disease Index 
            .add(client.prepareSearch(DISEASE_INDEX)// Retrieved Directory 
                .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)) 
            //Search Doctor Index 
            .add(client.prepareSearch(DOCTOR_INDEX)// Retrieved Directory 
                    .setSearchType(SearchType.DEFAULT)// Query type                 
                    .setQuery(QueryBuilders.disMaxQuery() 
                              .add(QueryBuilders.matchQuery("name", searchParam.getKeyword())) 
                              .add(QueryBuilders.matchQuery("disease_tag", searchParam.getKeyword())) 
                              //City 

// .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();//execute

            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("Number of hit diseases: " + diseasResp.getHits().getTotalHits()); 

                    searchResultVo.setDiseaseTotal(diseasResp.getHits().getTotalHits()); 
                    for (SearchHit hits : diseasResp.getHits().getHits()) {             
                        Map<String, Object> sourceAsMap = hits.sourceAsMap(); 
                         //Get the corresponding highlight field 
                        Map<String, HighlightField> result = hits.highlightFields();   

                        //Gets the specified field from the set highlight field 
                        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("Number of hits to a doctor: " + doctorResp.getHits().getTotalHits()); 
                    searchResultVo.setDoctorTotal(doctorResp.getHits().getTotalHits()); 
                    for (SearchHit hits : doctorResp.getHits().getHits()) {             
                        Map<String, Object> sourceAsMap = hits.sourceAsMap(); 
                         //Get the corresponding highlight field 
                        Map<String, HighlightField> result = hits.highlightFields();   
                        //Gets the specified field from the set highlight field 
                        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; 
}

​

The above code searches for names and descriptions in disease information, and searches both disease and physician indexes

Set Paging Query

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

3 Highlight Information

​

Set a label to highlight the package at the beginning and end of the message

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)

~
​

​

Get highlighted result information

//Get the specified field from the set highlight field
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 ""; 
    } 
    //Get Defined Highlight Label 
    Text[] higlightTexts =  highlightFieldText.fragments(); 

    //Add custom highlight tags for title string values 
    String higlightText = "";   
    for(Text text : higlightTexts){     
        higlightText += text;   
    } 
    return higlightText; 
}

​

Learning Video

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