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MARC4J provide an easy to use API for working with MARC, MARCXML, MARC JSON in Java. MARC stands for MAchine Readable Cataloging and is a widely used exchange format for bibliographic data. MARCXML provides a loss-less conversion between MARC (MARC21 but also other formats like UNIMARC) and XML.

Features

The MARC4J library includes:

...

• Leader leader;
• List<ControlField> controlFields
• List<DataField> dataFields
• List<MarcError> errors

Examples 

Code snippet on Java to parse MARC file and print all information to console

public class App {

    public static void main(String args[]) throws Exception {

       // path to .mrc file
 String path = "";

 // Input Stream from file
 InputStream in = new FileInputStream(path);
 MarcReader reader = new MarcStreamReader(in);
 while (reader.hasNext()) {
            Record record = reader.next();
 Leader leader = record.getLeader();

 List<ControlField> controlFields = record.getControlFields();
 List<DataField> dataFields = record.getDataFields();

 System.out.println();
 System.out.println("LEADER: " + leader);
 System.out.println("Control fields: ");
 controlFields.forEach(System.out::println);
 System.out.println("Data fields: ");
 dataFields.forEach(System.out::println);
 System.out.println();
 }
   }
}