StringField: String field is indexed but not analyzed. Entire string value is stored as single token. It is useful to store ids, phone numbers, country fields etc.,
TextField: Text field is indexed and tokenized, without term vectors. If you want full-text searching use this field.
StoredField: It is a stored field that is not indexed at all (and so, is not searchable).
Example
Document doc = new Document();
doc.add(new StringField("id", id, Field.Store.YES));
doc.add(new TextField("title", title, Field.Store.YES));
doc.add(new TextField("description", description, Field.Store.NO));
doc.add(new TextField("blog", blog, Field.Store.YES));
doc.add(new StoredField("version", VERSION));
Find the below working application.
DocumentUtil.java
package com.sample.app.util;
import java.util.Arrays;
import java.util.List;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.StoredField;
import org.apache.lucene.document.StringField;
import org.apache.lucene.document.TextField;
public class DocumentUtil {
private static final String VERSION = "1.23";
public static Document getDocument(String id, String title, String description, String blog) {
Document doc = new Document();
doc.add(new StringField("id", id, Field.Store.YES));
doc.add(new TextField("title", title, Field.Store.YES));
doc.add(new TextField("description", description, Field.Store.NO));
doc.add(new TextField("blog", blog, Field.Store.YES));
doc.add(new StoredField("version", VERSION));
return doc;
}
public static List<Document> getDocuments() {
Document doc1 = getDocument("1", "JavaWorld",
"The original independent resource for Java developers, architects, and managers.", " javaworld.com");
Document doc2 = getDocument("2", "Oracle Blogs | The Java Source",
" Java powers more than 4.5 billion devices including 800 million computers and 1.5 billion cell phones. If you love Java, this is the blog you must follow.",
"blogs.oracle.com/java");
Document doc3 = getDocument("3", "A Java geek",
"Nicolas Fränkel's blog. IT architect focusing on Java, Java EE, and their surrounding ecosystems. He is a trainer, book writer, speaker & blogger.",
"blog.frankel.ch");
Document doc4 = getDocument("4", "Self Learning Java", "Learn Java fundamentals and other java libraries",
"self-learning-java-tutorial.blogspot.com");
return Arrays.asList(doc1, doc2, doc3, doc4);
}
}
App.java
package com.sample.app;
import java.io.File;
import java.io.IOException;
import java.util.List;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.index.MultiBits;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.MMapDirectory;
import org.apache.lucene.store.NoLockFactory;
import org.apache.lucene.util.Bits;
import com.sample.app.util.DocumentUtil;
public class App {
private static void printAllDocuments(Directory directory) throws IOException {
try (IndexReader indexReader = DirectoryReader.open(directory)) {
System.out.println("All Documents in Lucene Index");
Bits liveDocs = MultiBits.getLiveDocs(indexReader);
for (int i = 0; i < indexReader.maxDoc(); i++) {
if (liveDocs != null && !liveDocs.get(i))
continue;
Document doc = indexReader.document(i);
System.out.println(doc.get("id") + ", " + doc.get("title") + ", " + doc.get("version"));
}
System.out.println();
}
}
public static void main(String args[]) throws IOException {
Analyzer analyzer = new StandardAnalyzer();
IndexWriterConfig indexWriterConfig1 = new IndexWriterConfig(analyzer);
Directory directory = new MMapDirectory(new File("/Users/Shared/lucene").toPath(), NoLockFactory.INSTANCE);
try (IndexWriter indexWriter = new IndexWriter(directory, indexWriterConfig1)) {
List<Document> documents = DocumentUtil.getDocuments();
indexWriter.addDocuments(documents);
indexWriter.commit();
printAllDocuments(directory);
}
}
}
Output
All Documents in Lucene Index 1, JavaWorld, 1.23 2, Oracle Blogs | The Java Source, 1.23 3, A Java geek, 1.23 4, Self Learning Java, 1.23
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