elasticSearch(一)java链接elasticsearch

1.pom配置

 <!-- https://mvnrepository.com/artifact/org.elasticsearch.client/transport -->
        <dependency>
            <groupId>org.elasticsearch.client</groupId>
            <artifactId>transport</artifactId>
            <version>6.3.1</version>
        </dependency>

2.链接代码

public class patternBean {

    private Long flowId;
    private String pattern;
    private String question;
    private Date createDate;


    public Long getFlowId() {
        return flowId;
    }

    public void setFlowId(Long flowId) {
        this.flowId = flowId;
    }

    public String getPattern() {
        return pattern;
    }

    public void setPattern(String pattern) {
        this.pattern = pattern;
    }

    public String getQuestion() {
        return question;
    }

    public void setQuestion(String question) {
        this.question = question;
    }

    public Date getCreateDate() {
        return createDate;
    }

    public void setCreateDate(Date createDate) {
        this.createDate = createDate;
    }

    @Override
    public String toString() {
        return "patternBean{" +
                "flowId=" + flowId +
                ", pattern='" + pattern + '\'' +
                ", question='" + question + '\'' +
                ", createDate=" + createDate +
                '}';
    }
}

public class esClientUtils {

    public static final String indexName="patternrepos";
    public static final String typeName="patterns";

    private static TransportClient client = null;

    static{
        try {
            client = new PreBuiltTransportClient(Settings.EMPTY)
                    .addTransportAddress(new TransportAddress(InetAddress.getByName("localhost"), 9300));
        } catch (UnknownHostException e) {
            e.printStackTrace();
        }
    }

    /**
     * 插入文档
     * @param indexName
     * @param type
     * @param json
     */
    public static void addDocument(String indexName,String type,JSONObject json){
        client.prepareIndex(indexName,type).setSource(json, XContentType.JSON).get();
    }

    /**
     * 查询文档
     * @param indexName
     * @param indexType
     * @param query
     * @return
     */
    public static SearchHits queryDocument(String indexName,String indexType,QueryBuilder query){

        //1.get the serachEngine
        SearchRequestBuilder searchBuilder=client.prepareSearch(indexName).setTypes(indexType);
        //2.set query condition

        //3.excute the query
        SearchResponse result=searchBuilder.setQuery(query)
//                .setFrom(0).setSize(20)
//                .addSort("time",SortOrder.ASC)
//                .setExplain(true)
                .execute().actionGet();

        //4.get the result
        SearchHits hits=result.getHits();

        return hits;
    }

    public static void deleteDocument(String indexName,String indexType,String id){
        client.prepareDelete(indexName,indexType,id).execute().actionGet();
    }


    public static void main(String[] args){

        //1.测试插入
        patternBean pb=new patternBean();
        pb.setFlowId(101L);
        pb.setPattern("今天.*(天气｜温度)");
        pb.setQuestion("天气很晴朗");
        pb.setCreateDate(new Date());
        //esClientUtils.addDocument(indexName,typeName,(JSONObject) JSONObject.toJSON(pb));

        //2.测试查询
        MatchPhraseQueryBuilder query1= QueryBuilders.matchPhraseQuery("flowId",101L);
        SearchHits result=esClientUtils.queryDocument(indexName,typeName,query1);
        for(int i=0;i<result.getHits().length;i++){
            Map<String,Object> itemMap=result.getHits()[i].getSourceAsMap();
            String pattern=(String)itemMap.get("pattern");
            String question=(String)itemMap.get("question");
            System.out.println(pattern);
            System.out.println(question);
        }

        //3.测试删除
        esClientUtils.deleteDocument(indexName,typeName,"6s437GYBthV9DQCpGEg5");


    }