我正在尝试使用 SolrJ 索引一些 pdf 文档,如http://wiki.apache.org/solr/ContentStreamUpdateRequestExample所述,下面是代码:
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,在查询 *:* 时,我得到了索引文档列表,但内容字段为空。如何更改上面的代码以提取文档的内容?
下面是描述该文档的 xml frament :
<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>
我不认为这个问题与 Apache Tika 的错误安装有关,因为以前我有一些 ServerException 但现在我已经在正确的路径中安装了所需的 jar。此外,我尝试使用同一类索引 txt 文件,但attr_content字段始终为空。