Solr检索数据

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Solr检索数据

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。

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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}

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