ElasticsearchRestTemplate实现scroll分页

桃扇骨 2022-09-12 03:45 296阅读 0赞

UserInfo类：

package com.jd.vo;
    
    import org.springframework.data.annotation.Id;
    import org.springframework.data.elasticsearch.annotations.Document;
    import org.springframework.data.elasticsearch.annotations.Field;
    import org.springframework.data.elasticsearch.annotations.FieldType;
    
    /**
     * @Document 用来声明ES索引信息
     * indexName 索引名称
     * shards 主分区数量，默认5
     * replicas 副本分区数量，默认1
     * createIndex true：SpringBoot启动后自动创建索引，此时映射Mapping为空，默认为true；false：SpringBoot启动后不会自动创建索引，需要手动创建索引。
     */
    @Document(indexName = "userinfo_index", shards = 5, replicas = 1, createIndex = false)
    public class UserInfo {
    
        @Id
        private Integer id;
        @Field(type = FieldType.Keyword)
        private String name;
        //type : 字段数据类型
        //analyzer : 分词器类型
        //index : 是否索引，默认为true
        @Field(type = FieldType.Text, analyzer = "ik_max_word", index = true)
        private String address;
    
        public UserInfo(Integer id, String name, String address) {
            this.id = id;
            this.name = name;
            this.address = address;
        }
    
        public Integer getId() {
            return id;
        }
        public void setId(Integer id) {
            this.id = id;
        }
        public String getName() {
            return name;
        }
        public void setName(String name) {
            this.name = name;
        }
        public String getAddress() {
            return address;
        }
        public void setAddress(String address) {
            this.address = address;
        }
    }

PagingTests类：

package com.jd;
    
    import com.jd.vo.UserInfo;
    import org.elasticsearch.index.query.MatchAllQueryBuilder;
    import org.elasticsearch.index.query.QueryBuilders;
    import org.elasticsearch.search.sort.FieldSortBuilder;
    import org.elasticsearch.search.sort.SortOrder;
    import org.junit.jupiter.api.Test;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.boot.test.context.SpringBootTest;
    import org.springframework.data.elasticsearch.core.ElasticsearchRestTemplate;
    import org.springframework.data.elasticsearch.core.SearchHit;
    import org.springframework.data.elasticsearch.core.SearchScrollHits;
    import org.springframework.data.elasticsearch.core.mapping.IndexCoordinates;
    import org.springframework.data.elasticsearch.core.query.NativeSearchQuery;
    import org.springframework.data.elasticsearch.core.query.NativeSearchQueryBuilder;
    
    import java.io.IOException;
    import java.util.ArrayList;
    import java.util.List;
    
    @SpringBootTest
    public class PagingTests {
    
        @Autowired
        private ElasticsearchRestTemplate template;
    
        //批量操作，bulk [bʌlk] n. 巨大的体重(或重量、形状、身体等);
        @Test
        public void bulk() throws IOException {
            List<UserInfo> list = new ArrayList<>();
            list.add(new UserInfo(1, "Jim", "河南郑州市高新技术开发区朗月公园茂"));
            list.add(new UserInfo(2, "Lucy", "内蒙古自治区呼和浩特市回民区万嘉康城"));
            list.add(new UserInfo(3, "Kate", "江西省南昌市红谷滩区天赐良园"));
            list.add(new UserInfo(4, "Jhon", "福建省厦门市湖里区碧湖嘉园"));
            list.add(new UserInfo(5, "Tom", "吉林省长春市宽城区中正御华庭"));
            list.add(new UserInfo(6, "Jimmy", "广东省东莞市东城街道天宝花园"));
            list.add(new UserInfo(7, "Robert", "新疆自治区乌鲁木齐市头屯河区乌西五街小区"));
            Iterable iterable = template.save(list);
            System.out.println(iterable);
        }
        
        @Test
        public void scroll1() throws IOException {
            // 设置每页数据量
            int pageSize = 2;
            MatchAllQueryBuilder queryBuilder = QueryBuilders.matchAllQuery();//条件
            FieldSortBuilder sortBuilder = new FieldSortBuilder("id").order(SortOrder.ASC);//排序
            NativeSearchQuery nativeSearchQuery = new NativeSearchQueryBuilder().withQuery(queryBuilder).withSort(sortBuilder).build();
            nativeSearchQuery.setMaxResults(pageSize);// 设置每页数据量
    
            long scrollTimeInMillis = 60 * 1000;//设置缓存内数据的保留时间，不要把缓存时时间设置太长，否则占用内存。
            // 1、缓存第一页符合搜索条件的数据
            SearchScrollHits<UserInfo> searchScrollHits = template.searchScrollStart(scrollTimeInMillis, nativeSearchQuery, UserInfo.class, IndexCoordinates.of("userinfo_index"));
            String scrollId = searchScrollHits.getScrollId();
    
            int scrollTime=1;
            while (searchScrollHits.hasSearchHits()) {//2、判断searchScrollHits中是否有命中数据，如果为空，则表示已将符合查询条件的数据全部遍历完毕
                System.out.println("第"+scrollTime+"页数据，数据总数：" + searchScrollHits.getSearchHits().size());
    
                for (SearchHit<UserInfo> searchHit : searchScrollHits.getSearchHits()) {//3、 从缓存中读取数据
                    UserInfo book = searchHit.getContent();
                    System.out.println(book.getId()+" "+book.getName()+" "+book.getAddress());
                }
                //4、根据上次搜索结果scroll_id进入下一页数据搜索
                searchScrollHits = template.searchScrollContinue(scrollId, scrollTimeInMillis, UserInfo.class, IndexCoordinates.of("userinfo_index"));//该方法执行后将重新刷新快照保留时间
                scrollId = searchScrollHits.getScrollId();
                scrollTime=scrollTime+1;
            }
    
            List<String> scrollIds = new ArrayList<>();
            scrollIds.add(scrollId);
            template.searchScrollClear(scrollIds);// 清除 scroll
        }
    
        @Test
        public void scroll2() throws IOException {
            int pageNo=4;//设置第几页
            int pageSize = 2;// 设置每页数据量
    
            MatchAllQueryBuilder queryBuilder = QueryBuilders.matchAllQuery();//条件
            FieldSortBuilder sortBuilder = new FieldSortBuilder("id").order(SortOrder.ASC);//排序
            NativeSearchQuery nativeSearchQuery = new NativeSearchQueryBuilder().withQuery(queryBuilder).withSort(sortBuilder).build();
            nativeSearchQuery.setMaxResults(pageSize);// 设置每页数据量
    
            long scrollTimeInMillis = 60 * 1000;//设置缓存内数据的保留时间
            //1、缓存第一页符合搜索条件的数据
            SearchScrollHits<UserInfo> searchScrollHits = template.searchScrollStart(scrollTimeInMillis, nativeSearchQuery, UserInfo.class, IndexCoordinates.of("userinfo_index"));
            String scrollId = searchScrollHits.getScrollId();
    
            int scrollTime=1;
            while (searchScrollHits.hasSearchHits() && scrollTime<pageNo) {//2、判断searchScrollHits中是否有命中数据，如果为空，则表示已将符合查询条件的数据全部遍历完毕
                //3、根据上次搜索结果scroll_id进入下一页数据搜索
                searchScrollHits = template.searchScrollContinue(scrollId, scrollTimeInMillis, UserInfo.class, IndexCoordinates.of("userinfo_index"));//该方法执行后会重新刷新快照保留时间
                scrollId = searchScrollHits.getScrollId();
                scrollTime=scrollTime+1;
            }
    
            List<String> scrollIds = new ArrayList<>();
            scrollIds.add(scrollId);
            template.searchScrollClear(scrollIds);// 清除 scroll
    
            for (SearchHit<UserInfo> searchHit : searchScrollHits.getSearchHits()) {//4、 从缓存中读取数据
                UserInfo userInfo = searchHit.getContent();
                System.out.println(userInfo.getId()+" "+userInfo.getName()+" "+userInfo.getAddress());
            }
        }
    }