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import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import org.apache.http.NameValuePair;
import org.apache.http.client.CookieStore;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.BasicCookieStore;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.message.BasicNameValuePair;

public class SolrDataImportClient {
 
    private CloseableHttpClient httpclient = null;
    private CookieStore cookieStore = null;
    private final String baseSolrUrl;
     
    


    private static final String FULL_IMPORT = "full-import";
    


    private static final String DELTA_IMPORT = "delta-import";
     
    public SolrDataImportClient(String baseSolrUrl) {
        if(!baseSolrUrl.endsWith("/")){
            baseSolrUrl += "/";
        }
        this.baseSolrUrl = baseSolrUrl;
    }
     
    private synchronized void init(){
        if(httpclient == null){
            cookieStore = new BasicCookieStore();
            httpclient = HttpClientBuilder.create().setDefaultCookieStore(cookieStore).build();
        }
    }
 
    public void fullImport(String coreName) throws IOException {
        init();
         
        HttpPost post = getDataImportPost(coreName, FULL_IMPORT);
        httpclient.execute(post);
    }
     
    public void deltaImport(String coreName) throws IOException {
        init();
         
        HttpPost post = getDataImportPost(coreName, DELTA_IMPORT);
        httpclient.execute(post);
    }
     
    private HttpPost getDataImportPost(String coreName,String command) throws UnsupportedEncodingException{
        HttpPost post = new HttpPost(baseSolrUrl + coreName + "/dataimport?indent=on&wt=json&_=" + new Date().getTime());
        List<NameValuePair> params = new ArrayList<NameValuePair>();
        params.add(new BasicNameValuePair("command", command));
        params.add(new BasicNameValuePair("verbose", "false"));
        if(command.equals(FULL_IMPORT)){
            params.add(new BasicNameValuePair("clean", "true"));
        }
        params.add(new BasicNameValuePair("commit", "true"));
        params.add(new BasicNameValuePair("optimize", "false"));
        params.add(new BasicNameValuePair("core", coreName));
        params.add(new BasicNameValuePair("name", "dataimport"));
        post.setEntity(new UrlEncodedFormEntity(params, "UTF-8"));
        return post;
    }
     
    public void close() throws IOException{
        httpclient.close();
        httpclient = null;
        cookieStore = null;
    }
     
}

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@Test
public void fullImport() throws Exception{
    SolrDataImportClient dataClient = new SolrDataImportClient("http://192.168.100.27:8983/solr/");
    dataClient.fullImport("testcore");
    dataClient.close();
}




@Test
public void deltaImport() throws Exception{
    SolrDataImportClient dataClient = new SolrDataImportClient("http://192.168.100.27:8983/solr/");
    dataClient.deltaImport("testcore");
    dataClient.close();
}