Java做客户端对Elasticsearch服务的一些操作(二)

怼烎@ 2022-05-28 14:10 177阅读 0赞

**代码:**

package com.east.operation;
    
    import org.elasticsearch.client.Client;
    import org.elasticsearch.common.unit.TimeValue;
    import org.elasticsearch.action.get.GetRequestBuilder;
    import org.elasticsearch.action.get.GetResponse;
    import org.elasticsearch.action.search.SearchResponse;
    import org.elasticsearch.action.search.SearchType;
    import org.elasticsearch.index.query.QueryBuilder;
    import org.elasticsearch.index.query.QueryBuilders;
    import org.elasticsearch.search.SearchHit;
    
    /**
     * 索引的几种查询方式
     * @author lhy
     * @date 2018.03.20
     */
    public class EsQuery {
        private Client client;
    
    	public EsQuery(Client client) {
    		super();
    		this.client = client;
    	}
        
    	/**
    	 * 使用get查询方式
    	 * @param index
    	 * @param type
    	 * @param id
    	 */
    	public void QueryGet(String index,String type,String id){
    		GetRequestBuilder builder = client.prepareGet(index, type, id);
    		GetResponse response = builder.execute().actionGet();
    //		GetResponse getResponse = builder.get();
    //        ListenableActionFuture<GetResponse> execute = (ListenableActionFuture<GetResponse>) builder.execute();
            System.out.println(response.getSourceAsString());
    	}
    	
    	/**
    	 * 使用QueryBuilder
         * termQuery("key", obj) 完全匹配
         * termsQuery("key", obj1, obj2..)   一次匹配多个值
         * matchQuery("key", Obj) 单个匹配, field不支持通配符, 前缀具高级特性
         * multiMatchQuery("text", "field1", "field2"..);  匹配多个字段, field有通配符忒行
         * matchAllQuery();         匹配所有文件
    	 */
    	public void QueryBuilderTest(){
    //		QueryBuilder query = QueryBuilders.termQuery("name", "杨旭9");
    //		QueryBuilder query = QueryBuilders.termsQuery("name", "海哥","杨旭","小花");
    		QueryBuilder queryBuilder = QueryBuilders.matchQuery("name", "杨旭");
    //		QueryBuilder builder = QueryBuilders.multiMatchQuery("name", "海哥","杨旭","小花");
    //		QueryBuilder allQuery = QueryBuilders.matchAllQuery();
    //		System.out.println("你的查询条件为" + queryBuilder);
    		SearchFunction(queryBuilder);
    	}
    	
    	/**
    	 * 模糊查询
    	 */
    	public void MoHuQuery(String name, String value){
    		QueryBuilder builder = QueryBuilders.fuzzyQuery(name, value);
    		SearchFunction(builder);
    	}
    	
    	/**
    	 * 字段非空查询
    	 */
    	public void NotNullQuery(String name){
    		QueryBuilder builder = QueryBuilders.existsQuery(name);
    		SearchFunction(builder);
    	}
    	
    	
    	/**
    	 * 根据文档id查询某个文档
    	 * @param id
    	 */
        public void QueryById(String id){
        	 QueryBuilder queryBuilder = QueryBuilders.idsQuery().addIds(id);
        	 SearchFunction(queryBuilder);
        }
        
        /**
         * 通配符查询, 支持 * 
         * 匹配任何字符序列, 包括空
         * 避免* 开始, 会检索大量内容造成效率缓慢
         */
        public void WildCardQuery(){
        	QueryBuilder builder = QueryBuilders.wildcardQuery("name", "杨*");
        	SearchFunction(builder);
        }
    	
    	/**
    	 * 组合查询 
    	 * must(QueryBuilders)   :   AND
         * mustNot(QueryBuilders): NOT
         * should:               : OR
    	 */
    	public void ZuHeQuery(){
    		QueryBuilder builder = QueryBuilders.boolQuery()
    				.must(QueryBuilders.termQuery("tel", "12345678"))
    				.mustNot(QueryBuilders.termQuery("age", "25"))
    				.should(QueryBuilders.termQuery("score", "88"));
    		SearchFunction(builder);
    	}
    	
    	/**
    	 * 查询遍历抽取
    	 * @param queryBuilder
    	 */
    	public void SearchFunction(QueryBuilder queryBuilder) {
    		SearchResponse response = client.prepareSearch("student").setTypes("student01")
    				.setSearchType(SearchType.DFS_QUERY_THEN_FETCH).setScroll(new TimeValue(6000)).setQuery(queryBuilder)
    				.setSize(10).execute().actionGet();
    		for (SearchHit hit : response.getHits()) {
    			System.out.println("相关度分值: " + hit.getScore());
    			System.out.println("文档内容: " + hit.getSourceAsString());
    		}
    	}
        
        
    }

package com.east.test;
    
    import org.elasticsearch.client.Client;
    
    import com.east.common.EsUtil;
    import com.east.operation.EsQuery;
    
    public class EsQueryTest {
    
    	public static void main(String[] args) {
    		// TODO Auto-generated method stub
    		Client client = EsUtil.EsConnect();
            EsQuery es = new EsQuery(client);
            es.QueryGet("student", "student01", "3");   //使用get查询方式
            es.QueryBuilderTest();      //使用QueryBuilder作用域匹配查询
            es.MoHuQuery("age", "22");  //模糊查询
            es.QueryById("3");          //查询id为3的文档
            es.ZuHeQuery();             //多条件组合查询
            es.WildCardQuery();           //通配符查询
            es.NotNullQuery("name");       //查询name不为空的字段
            
    	}
    
    }