我試圖索引使用SolrJ一些PDF文檔如http://wiki.apache.org/solr/ContentStreamUpdateRequestExample描述,下面有代碼:如何索引pdf的內容與SolrJ?
import static org.apache.solr.handler.extraction.ExtractingParams.LITERALS_PREFIX;
import static org.apache.solr.handler.extraction.ExtractingParams.MAP_PREFIX;
import static org.apache.solr.handler.extraction.ExtractingParams.UNKNOWN_FIELD_PREFIX;
import org.apache.solr.client.solrj.SolrServer;
import org.apache.solr.client.solrj.SolrServerException;
import org.apache.solr.client.solrj.impl.CommonsHttpSolrServer;
import org.apache.solr.client.solrj.request.AbstractUpdateRequest;
import org.apache.solr.client.solrj.request.ContentStreamUpdateRequest;
import org.apache.solr.common.util.NamedList;
...
public static void indexFilesSolrCell(String fileName) throws IOException, SolrServerException {
String urlString = "http://localhost:8080/solr";
SolrServer server = new CommonsHttpSolrServer(urlString);
ContentStreamUpdateRequest up = new ContentStreamUpdateRequest("/update/extract");
up.addFile(new File(fileName));
String id = fileName.substring(fileName.lastIndexOf('/')+1);
System.out.println(id);
up.setParam(LITERALS_PREFIX + "id", id);
up.setParam(LITERALS_PREFIX + "location", fileName); // this field doesn't exists in schema.xml, it'll be created as attr_location
up.setParam(UNKNOWN_FIELD_PREFIX, "attr_");
up.setParam(MAP_PREFIX + "content", "attr_content");
up.setAction(AbstractUpdateRequest.ACTION.COMMIT, true, true);
NamedList<Object> request = server.request(up);
for(Entry<String, Object> entry : request){
System.out.println(entry.getKey());
System.out.println(entry.getValue());
}
}
不幸的是在查詢時,*:*我獲得索引文件的列表中,但含量場空。如何更改上面的代碼以提取文檔的內容?
下面還有的XML frament描述this document:
<doc>
<arr name="attr_content">
<str> </str>
</arr>
<arr name="attr_location">
<str>/home/alex/Documents/lsp.pdf</str>
</arr>
<arr name="attr_meta">
<str>stream_size</str>
<str>31203</str>
<str>Content-Type</str>
<str>application/pdf</str>
</arr>
<arr name="attr_stream_size">
<str>31203</str>
</arr>
<arr name="content_type">
<str>application/pdf</str>
</arr>
<str name="id">lsp.pdf</str>
</doc>
我不認爲這個問題是關係到一個不正確的安裝Apache Tika的因爲以前我有幾個ServerException但現在我已經將所需的罐子安裝在正確的路徑中。此外,我試圖索引一個txt文件使用相同的類,但attr_content字段總是空的。