Java Solr SolrJ获取新索引文件的id值

import org.apache.solr.client.solrj.SolrClient;
import org.apache.solr.client.solrj.SolrQuery;
import org.apache.solr.client.solrj.SolrServerException;
import org.apache.solr.client.solrj.impl.HttpSolrClient;
import org.apache.solr.client.solrj.response.QueryResponse;
import org.apache.solr.common.SolrDocumentList;

public class SolrJExample {
    public static void main(String[] args) {
        String solrUrl = "http://localhost:8983/solr/mycore"; // Solr服务器的URL
        SolrClient solrClient = new HttpSolrClient.Builder(solrUrl).build();

        SolrQuery query = new SolrQuery("*:*"); // 查询所有文档
        query.setRows(1); // 设置返回结果数量为1

        try {
            QueryResponse response = solrClient.query(query);
            SolrDocumentList results = response.getResults();
            
            if (results.getNumFound() > 0) {
                String id = results.get(0).getFieldValue("id").toString();
                System.out.println("New index file id: " + id);
            } else {
                System.out.println("No new index file found.");
            }
        } catch (SolrServerException | IOException e) {
            e.printStackTrace();
        }
    }
}