Json Wikipedia contains code to convert the Wikipedia XML dump into a JSON dump.
compile the project running
mvn assembly:assembly
the command will produce a JAR file containing all the dependencies the target folder.
java -cp target/json-wikipedia-1.0.0-jar-with-dependencies.jar it.cnr.isti.hpc.wikipedia.cli.MediawikiToJsonCLI -input wikipedia-dump.xml.bz -output wikipedia-dump.json[.gz] -lang [en|it]
or
./scripts/convert-xml-dump-to-json.sh [en|it] wikipedia-dump.xml.bz wikipedia-dump.json[.gz]
produces in wikipedia-dump.json the JSON version of the dump. Each line of the file contains an article
of dump encoded in JSON. Each JSON line can be deserialized in an Article object,
which represents an
enriched version of the wikitext page.
Once you have created (or downloaded) the JSON dump (say wikipedia.json), you can iterate over the articles of the collection
easily using this snippet:
RecordReader<Article> reader = new RecordReader<Article>(
"wikipedia.json",new JsonRecordParser<Article>(Article.class)
).filter(TypeFilter.STD_FILTER);
for (Article a : reader) {
// do what you want with your articles
}
You can also add some filters in order to iterate only on certain articles (in the example we used only the standard type filter, which excludes meta pages e.g., Portal: or User: pages.).
The RecordReader and JsonRecordParser are part of the hpc-utils package.
In order to use these classes, you will have to install json-wikipedia in your maven repository:
mvn install
and import the project in your new maven project adding the dependency:
<dependency>
<groupId>it.cnr.isti.hpc</groupId>
<artifactId>json-wikipedia</artifactId>
<version>1.0.0</version>
</dependency>
root
|-- integerNamespace: long (nullable = true)
|-- lang: string (nullable = true)
|-- links: array (nullable = true)
| |-- element: struct (containsNull = true)
| | |-- description: string (nullable = true)
| | |-- end: long (nullable = true)
| | |-- id: string (nullable = true)
| | |-- start: long (nullable = true)
|-- namespace: string (nullable = true)
|-- paragraphsLink: array (nullable = true)
| |-- element: struct (containsNull = true)
| | |-- links: array (nullable = true)
| | | |-- element: struct (containsNull = true)
| | | | |-- description: string (nullable = true)
| | | | |-- end: long (nullable = true)
| | | | |-- id: string (nullable = true)
| | | | |-- start: long (nullable = true)
| | |-- paraText: string (nullable = true)
|-- redirect: string (nullable = true)
|-- title: string (nullable = true)
|-- type: string (nullable = true)
|-- wid: long (nullable = true)
|-- wikiText: string (nullable = true)
|-- wikiTitle: string (nullable = true)