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MARC4J provide provides an easy to use API for working with MARC (binary), 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:

...

MARC4J provides readers and writers for MARC and MARCXML. A org.marc4j.MarcReader implementation parses input data and provides an iterator over a collection of org.marc4j.marc.Record objects. The record object model is also suitable for in-memory editing of MARC records, just as DOM is used for XML editing purposes. Using a org.marc4j.MarcWriter implementation it is possible to create MARC or MARCXML. Once MARC data has been converted to XML, you can further process the result with XSLT, for example to convert MARC to MODS .

Although MARC4J is primarily designed for Java development, you can use the command-line utilities org.marc4j.util.MarcXmlDriver and org.marc4j.util.XmlMarcDriver to convert between MARC and MARCXML. It is also possible to pre- or postprocess the result using XSLT, for example to convert directly from MODS to MARC or from MARC to MODS.

...

For parse records and interact with them you need to use to two main Interfaces:

• MarcReader
• Record

...

Records

The main entity that describe describes all types of records is org.marc4j.marc.Record. It represent represents a MARC document as a plain java object with fields. Each MARC record after parsing have has such fields:

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

...

JSON representation of marc record entity

{
  "leader": "00508cjm a22001813 4500",
 "fields": [
    {
      "001": "10062588"
 },
 {
      "005": "20171013073237.0"
 },
 {
      "007": "sd fsngnnmmneu"
 },
 {
      "008": "170825s2017 xx nn n zxx d"
 },
 {
      "024": {
        "subfields": [
          {
            "a": "00190295755553"
 },
 {
            "2": "gtin-14"
 }
        ],
 "ind1": "7",
 "ind2": " "
 }
    },
 {
      "024": {
        "subfields": [
          {
            "a": "190295755553"
 }
        ],
 "ind1": "1",
 "ind2": " "
 }
    },
 {
      "035": {
        "subfields": [
          {
            "a": "(OCoLC)1002130878"
 }
        ],
 "ind1": " ",
 "ind2": " "
 }
    },
 {
      "035": {
        "subfields": [
          {
            "a": "10062588"
 }
        ],
 "ind1": " ",
 "ind2": " "
 }
    },
 {
      "040": {
        "subfields": [
          {
            "a": "BTCTA"
 },
 {
            "b": "eng"
 },
 {
            "c": "BTCTA"
 }
        ],
 "ind1": " ",
 "ind2": " "
 }
    },
 {
      "100": {
        "subfields": [
          {
            "a": "Rossi, Daniele"
 }
        ],
 "ind1": "1",
 "ind2": " "
 }
    },
 {
      "245": {
        "subfields": [
          {
            "a": "Saint-Saens: Organ Symphony and Carnival of The Animals"
 }
        ],
 "ind1": "0",
 "ind2": "0"
 }
    },
 {
      "260": {
        "subfields": [
          {
            "b": "Wea Corp"
 },
 {
            "c": "2017."
 }
        ],
 "ind1": " ",
 "ind2": " "
 }
    },
 {
      "948": {
        "subfields": [
          {
            "a": "20171013"
 },
 {
            "b": "m"
 },
 {
            "d": "batch"
 },
 {
            "e": "lts"
 },
 {
            "x": "deloclcprefix"
 }
        ],
 "ind1": "2",
 "ind2": " "
 }
    }
  ]
}

Code snippet

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();
 }
    }
}