如何使用Java Client API检索数据。假设有一个名为sample.csv的.csv文档，其中包含以下内容。
001,9848022337,Hyderabad,Rajiv,Reddy 002,9848022338,Kolkata,Siddarth,Battacharya 003,9848022339,Delhi,Rajesh,Khanna可以使用
post命令在核心-solr_sample下对此数据编制索引。
[web3@ubuntu:/usr/local/solr]$ ./post -c solr_sample sample.csv以下是向Apache Solr索引添加文档的Java程序代码。将此代码保存在
RetrievingData.java的文件中。
import java.io.IOException;
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 RetrievingData {
public static void main(String args[]) throws SolrServerException, IOException {
//Preparing the Solr client
String urlString = "http://localhost:8983/Solr/my_core";
SolrClient Solr = new HttpSolrClient.Builder(urlString).build();
//Preparing Solr query
SolrQuery query = new SolrQuery();
query.setQuery("*:*");
//Adding the field to be retrieved
query.addField("*");
//Executing the query
QueryResponse queryResponse = Solr.query(query);
//Storing the results of the query
SolrDocumentList docs = queryResponse.getResults();
System.out.println(docs);
System.out.println(docs.get(0));
System.out.println(docs.get(1));
System.out.println(docs.get(2));
//Saving the operations
Solr.commit();
}
}
通过在终端中执行以下命令编译上述代码
[web3@ubuntu:/usr/local/solr]$ javac RetrievingData.java [web3@ubuntu:/usr/local/solr]$ java RetrievingData执行上述命令后，将得到以下输出。
{numFound = 3,start = 0,docs = [SolrDocument{id=001, phone = [9848022337],
city = [Hyderabad], first_name = [Rajiv], last_name = [Reddy],
_version_ = 1547262806014820352}, SolrDocument{id = 002, phone = [9848022338],
city = [Kolkata], first_name = [Siddarth], last_name = [Battacharya],
_version_ = 1547262806026354688}, SolrDocument{id = 003, phone = [9848022339],
city = [Delhi], first_name = [Rajesh], last_name = [Khanna],
_version_ = 1547262806029500416}]}
SolrDocument{id = 001, phone = [9848022337], city = [Hyderabad], first_name = [Rajiv],
last_name = [Reddy], _version_ = 1547262806014820352}
SolrDocument{id = 002, phone = [9848022338], city = [Kolkata], first_name = [Siddarth],
last_name = [Battacharya], _version_ = 1547262806026354688}
SolrDocument{id = 003, phone = [9848022339], city = [Delhi], first_name = [Rajesh],
last_name = [Khanna], _version_ = 1547262806029500416}
