如何使用SolrJ索引pdf内容?

时间:2011-04-17 13:06:44

标签: java solr solr-cell

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,我获得了索引文档的列表,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this document的xml框架:

<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,因为之前我有一些ServerException,但现在我已经在正确的路径中安装了所需的jar。此外,我尝试使用相同的类索引txt文件,但 attr_content 字段始终为空。

1 个答案:

答案 0 :(得分:1)

在schema.xml文件中,您是否在内容字段中设置了“stored = true”,这是我的schema.xml文件的一个示例,我用它来存储pdf和其他二进制文件的内容。

<field name="text" type="textgen" indexed="true" stored="true" required="false" multiValued="true"/>

对你有帮助吗?

埃克托