MARC4J 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:

...

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

Writers

Marc4j lib testing experience

...

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();
 }
    }
}

Transform MARCJson to MARCXML.

...

Code Block
language java title From Json to Dublin Core data
String stylesheetUrl = "https://www.loc.gov/standards/marcxml/xslt/MARC21slim2OAIDC.xsl"; Source stylesheet = new StreamSource(stylesheetUrl); Result result = new StreamResult(System.out); InputStream input = new FileInputStream(INPUT_JSON_FILE); MarcReader reader = new MarcJsonReader(input); MarcXmlWriter writer = new MarcXmlWriter(result, stylesheet); writer.setConverter(new AnselToUnicode()); while (reader.hasNext()) { Record record = (Record) reader.next(); writer.write(record); } writer.close();

Code Block
title Dublin Core xml result collapse true
<?xml version="1.0" encoding="UTF-8"?> <oai_dc:dcCollection xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/"> <oai_dc:dc> <dc:title>Futures, biometrics and neuroscience research</dc:title> <dc:creator>Moutinho, LuizHerausgeberInedt(DE-601)509450954(DE-588)131450204</dc:creator> <dc:creator>Sokele, MladenHerausgeberInedt</dc:creator> <dc:type>text</dc:type> <dc:language>eng</dc:language> <dc:format>application/pdf</dc:format> <dc:description>Enthl̃t 9 Beitrg̃e</dc:description> <dc:subject>Betriebswirtschaftslehre</dc:subject> <dc:subject>Management</dc:subject> <dc:subject>Wissenschaftliche Methode</dc:subject> <dc:identifier>http://www.gbv.de/dms/zbw/101073931X.pdf</dc:identifier> <dc:identifier>URN:ISBN:3319643991</dc:identifier> <dc:identifier>URN:ISBN:9783319643991</dc:identifier> <dc:identifier>URN:ISBN:9783319644004 (electronic)</dc:identifier> </oai_dc:dc> </oai_dc:dcCollection>

Testing Marc4j writer

1. Reading a Marc Json and printing in MARC format. Observation was that if encoding was not used, the MARC generated was invalid

import java.io.FileInputStream;
import java.io.InputStream;
import org.marc4j.*;
import org.marc4j.marc.Record;

public class TestMarc4jWriter {

  public static void main(String args[]) throws Exception {
    InputStream input = new FileInputStream("MarcFileinjsonFormat");
    MarcReader reader = new MarcJsonReader(input);
    MarcWriter writer = new MarcStreamWriter(System.out, "UTF8");


    while (reader.hasNext()) {
        Record record = reader.next();
        writer.write(record);
    }

    writer.close();
}
}

Validating a MARC file locally

An opensource tool MARCEDIT can be used for validating MARC files, and also for conversion
Reference: https://marcedit.reeset.net/

REFERENCES:

https://github.com/marc4j/marc4j

Formateed Tutorial: http://projects.freelibrary.info/freelib-marc4j/tutorial.html