Elasticsearch--javaAPI---全文检索_java api elasticsearch 全文搜索-优快云博客

本文介绍了一种基于Elasticsearch的公用查询类实现，通过具体示例展示了如何使用matchQuery、multiMatchQuery及操作符来精确检索数据。文章涵盖了查询构建、结果解析及打印过程，适合对Elasticsearch感兴趣的开发者阅读。

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公用查询类

import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.index.query.QueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;

import java.util.Map;

public class QueryUtil {
    private String index="my-index";
    private int size=3;
    private SearchHits hits;
    private TransportClient client = ESUtil.getClient();

    public QueryUtil(String index,int size){
        this.index=index;
        this.size=size;
    }

    public QueryUtil query(QueryBuilder query){
        //搜索结果存入SearchResponse
        SearchResponse response=client.prepareSearch(index)
                .setQuery(query) //设置查询器
                .setSize(size)      //一次查询文档数
                .get();
        this.hits=response.getHits();
        return this;
    }

    public void print(){
        if(hits==null){
            return ;
        }
        for(SearchHit hit:hits){
            System.out.println("source:"+hit.getSourceAsString());
            System.out.println("index:"+hit.getIndex());
            System.out.println("type:"+hit.getType());
            System.out.println("id:"+hit.getId());
            //遍历文档的每个字段
            Map<String,Object> map=hit.getSourceAsMap();
            for(String key:map.keySet()){
                System.out.println(key+"="+map.get(key));
            }
        }
    }
}

查询实例

 @Test
    public void testFullTestQuery(){
        QueryUtil util=new QueryUtil("my-index",5);
        //构造查询对象
        QueryBuilder qb=QueryBuilders.matchQuery(
                "gender",
                "女");
        util.query(qb).print();
    }

Operator

@Test
    public void testOperator() {
        QueryUtil util = new QueryUtil("website", 5);
        //构造查询对象
        //QueryBuilder qb=QueryBuilders.matchQuery("title", "centos");
        QueryBuilder qb = QueryBuilders
                .matchQuery("title", "centos升级")
                .operator(Operator.AND);
        util.query(qb).print();

    }

multiMatchQuery

@Test
    public void testMultiMatchQuery() {
        QueryUtil util = new QueryUtil("website", 5);
        QueryBuilder qb = QueryBuilders.multiMatchQuery("centos", "title", "abstract");
        util.query(qb).print();

    }