ES6.6.2 使用小结 - 全量查询数据

1.通过这篇文章来讲讲如何进行全量查询。

2.假设当前ES存在如下数据(两条)。

3.全量查询源码如下： 

package com.bas.demo;

import com.bas.util.ESUtil;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.index.query.QueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;

import java.util.Map;

public class MatchQueryDemo {
    public static void main(String[] args) {
        TransportClient client = ESUtil.getClient();
        //构造查询对象
        QueryBuilder query = QueryBuilders.matchAllQuery();
        //搜索结果存入SearchResponse
        SearchResponse response = client.prepareSearch("app_account")
                .setQuery(query) //设置查询器
                .setSize(3)      //一次查询文档数
                .get();
        SearchHits hits = response.getHits();
        int count = 1;
        for (SearchHit hit : hits) {
            System.out.println("--------------------" + count++);
            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 map = hit.getSourceAsMap();
            for (String key : map.keySet()) {
                System.out.println(key + "=" + map.get(key));
            }
            System.out.println("--------------------\n");
        }
    }
}

其中，ES工具类位于：ES6.6.2 使用小结 - ES工具类使用  

4.执行MatchQueryDemo.main()，如图：