实现Java ES分页查询排序

一、流程表格

步骤 描述
1 创建Elasticsearch客户端
2 构建查询请求
3 设置分页和排序参数
4 执行查询请求
5 处理查询结果

二、具体步骤及代码示例

步骤一：创建Elasticsearch客户端

// 创建Elasticsearch客户端
RestHighLevelClient client = new RestHighLevelClient(
    RestClient.builder(
            new HttpHost("localhost", 9200, "http")));

步骤二：构建查询请求

// 构建查询请求
SearchRequest searchRequest = new SearchRequest("index_name");
SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();

步骤三：设置分页和排序参数

// 设置分页参数
sourceBuilder.from(0); // 起始记录
sourceBuilder.size(10); // 每页记录数

// 设置排序参数
sourceBuilder.sort("field_name", SortOrder.ASC); // 按字段升序排序

步骤四：执行查询请求

// 执行查询请求
searchRequest.source(sourceBuilder);
SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);

步骤五：处理查询结果

// 处理查询结果
SearchHits hits = searchResponse.getHits();
for (SearchHit hit : hits.getHits()) {
    // 处理每条查询结果
}

三、类图示例

classDiagram
    class RestHighLevelClient {
        - RestClient client
        + RestHighLevelClient(HttpHost[] hosts)
        + void close()
        + SearchResponse search(SearchRequest request, RequestOptions options)
    }
    class SearchRequest {
        - String index
        - SearchSourceBuilder source
        + SearchRequest(String index)
        + void source(SearchSourceBuilder source)
    }
    class SearchSourceBuilder {
        - int from
        - int size
        - List<SortBuilder> sorts
        + void from(int from)
        + void size(int size)
        + void sort(String field, SortOrder order)
    }
    class SearchResponse {
        - SearchHits hits
        + SearchHits getHits()
    }
    class SearchHits {
        - List<SearchHit> hits
        + List<SearchHit> getHits()
    }
    class SearchHit {
        // 查询结果字段
    }
    class SortBuilder {
        - String field
        - SortOrder order
    }
    class SortOrder {
        + ASC
        + DESC
    }

通过以上步骤和代码示例，你可以成功实现Java ES分页查询排序。希望对你有所帮助！如果有任何疑问，欢迎随时向我提问。