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By default, Solr responses are returned in XML format. However, Solr can provide several other output formats including JSON and CSV. Discovery uses the javabin format. The Solr request parameter is wt (e.g. &wt=json). For more information, see Response Writers, QueryResponseWriters.
An interesting option is to specify an XSLT stylesheet that can transform the XML response (server-side) to any format you choose, typically HTML. Append &wt=xslt&tr=example.xsl to the Solr request URL. The .xsl files must be provided in the [dspace]/solr/search/conf/xslt/ directory.
For more information, see XsltResponseWriter.

PHP example

$solr_baseurl_dspace = "http://localhost:8080/solr/search/query?";
$solr_query = "test";
$solr_URL_dspace = $solr_baseurl_dspace."wt=phps&q=".urlencode($solr_query." AND withdrawn:false"); // use withdrawn:false with DSpace newer than 1.8
$response_dspace = file_get_contents($solr_URL_dspace, false, stream_context_create(array('http' => array('timeout' => 10))));
$result_dspace = unserialize($response_dspace);
$num_dspace = $result_dspace['response']['numFound'];
echo $num_dspace;

Examples

Date of last deposited item

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• Solr: How can I delete all documents from my index?
• DSpace: deleted wrong directory

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Set up Solritas (VelocityResponseWriter)

Solritas is a generic search interface on top of a Solr index. It can be useful if you want to explore the contents of a Solr index (core) using facets.

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