該Scroll迭代方式，省去了反復(fù)設(shè)置scrollID的操作。（scroll查詢方法，目前不支持Aggregate,Distinct,Rank子句，僅支持單字段sort。）

搜索報(bào)錯(cuò)判斷：用戶需按code和message，進(jìn)行異常情況判斷，不要按status進(jìn)行判斷。code對(duì)應(yīng)的錯(cuò)誤信息查看——錯(cuò)誤碼文檔。

SDK樣例Demo:

package com.aliyun.opensearch;

import com.aliyun.opensearch.sdk.dependencies.com.google.common.collect.Lists;
import com.aliyun.opensearch.sdk.generated.OpenSearch;
import com.aliyun.opensearch.sdk.generated.search.*;
import com.aliyun.opensearch.search.DeepPageingIterator;
import java.nio.charset.Charset;

public class testScrollIterator {

    //Scroll不支持Aggregate,Distinct,Rank子句；支持單字段sort
    private static String appName = "替換為opensearch應(yīng)用名";
    private static String tableName = "替換opensearch應(yīng)用表名";
    private static String host = "替換應(yīng)用的API訪問地址";


    public static void main(String[] args) {
      
      	//用戶識(shí)別信息
      	//從環(huán)境變量讀取配置的AccessKey ID和AccessKey Secret，運(yùn)行代碼示例前必須先配置環(huán)境變量
        String accesskey = System.getenv("ALIBABA_CLOUD_ACCESS_KEY_ID");
        String secret = System.getenv("ALIBABA_CLOUD_ACCESS_KEY_SECRET");

        //查看文件和默認(rèn)編碼格式
        System.out.println(String.format("file.encoding: %s", System.getProperty("file.encoding")));
        System.out.println(String.format("defaultCharset: %s", Charset.defaultCharset().name()));


        //創(chuàng)建并構(gòu)造OpenSearch對(duì)象
        OpenSearch openSearch = new OpenSearch(accesskey, secret, host);

        //創(chuàng)建OpenSearchClient對(duì)象，并以O(shè)penSearch對(duì)象作為構(gòu)造參數(shù)
        OpenSearchClient serviceClient = new OpenSearchClient(openSearch);

        //創(chuàng)建SearcherClient對(duì)象，并以O(shè)penSearchClient對(duì)象作為構(gòu)造參數(shù)
        SearcherClient searcherClient = new SearcherClient(serviceClient);

        //定義Config對(duì)象，用于設(shè)定config子句參數(shù)，分頁(yè)，數(shù)據(jù)返回格式，應(yīng)用名等等
        Config config = new Config(Lists.newArrayList(appName));

        //config.setStart(start) scroll該參數(shù)不起作用，默認(rèn)為0
        config.setHits(5);//設(shè)置每頁(yè)為5條記錄

        //設(shè)置返回格式為FULLJSON,目前scroll只支持返回JSON和FULLJSON格式
        config.setSearchFormat(SearchFormat.FULLJSON);

        // 設(shè)置搜索結(jié)果返回應(yīng)用中哪些字段
        config.setFetchFields(Lists.newArrayList("id", "name", "phone", "int_arr", "literal_arr", "float_arr", "cate_id"));
        // 注意：config子句中的rerank_size參數(shù)，在Rank類對(duì)象中設(shè)置

        // 創(chuàng)建參數(shù)對(duì)象
        SearchParams searchParams = new SearchParams(config);

        // 設(shè)置查詢子句，若需多個(gè)索引組合查詢，需要setQuery處合并，否則若設(shè)置多個(gè)setQuery后面的會(huì)替換前面查詢
        searchParams.setQuery("name:'opensearch'");

        // 設(shè)置查詢過濾條件
        //searchParams.setFilter("cate_id<=3"); //此處也可改用后面的ParamsBuilder實(shí)現(xiàn)添加過濾條件

       	// 設(shè)置sort條件
        Sort sorter = new Sort();
        sorter.addToSortFields(new SortField("id", Order.DECREASE)); //設(shè)置id字段降序
 
         //添加Sort對(duì)象參數(shù)
        searchParams.setSort(sorter);     
      
        //設(shè)置scroll方式查詢
        DeepPaging deep =new DeepPaging();

        //添加DeepPaging對(duì)象參數(shù)
        searchParams.setDeepPaging(deep);

        //使用DeepPageingIterator迭代操作起來會(huì)方便很多，可以不用管scroll_id之類的東西.
        DeepPageingIterator pagesIterator = new DeepPageingIterator(searcherClient, searchParams);

        //迭代器默認(rèn)的迭代間隔是100毫秒. 此設(shè)計(jì)是為防止翻頁(yè)速度太快對(duì)我們這邊造成壓力. 當(dāng)然可以改變這個(gè)迭代間隔，如下所示.
        //pagesIterator.setPagingIntervals(80);//單位:ms

        //用戶需按errors中的code和message進(jìn)行異常情況判斷，不要按status進(jìn)行判斷。code對(duì)應(yīng)的錯(cuò)誤信息查看——錯(cuò)誤碼文檔。
        try{

            System.out.println("test");
            while (pagesIterator.hasNext()) {
                System.out.println("調(diào)試信息輸出："+pagesIterator.next());
            }

        }catch(Exception ex){
            System.out.println("調(diào)試報(bào)錯(cuò)信息:"+ex.getMessage());
        }

    }
}