lucene 4.10 basic indexer

PostIndexer.java

package hpcde;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Map;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.StoredField;
import org.apache.lucene.document.TextField;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
import org.apache.lucene.util.Version;

import com.google.gson.Gson;
import com.google.gson.stream.JsonReader;

public class PostIndexer {

	public static void main(String[] args) throws IOException {
		String docsPath = "G:\\input";
		File docDir = new File(docsPath);
		String indexPath = "G:\\luceneIndex";
		Directory dir = FSDirectory.open(new File(indexPath));
		Analyzer analyzer = new StandardAnalyzer();
		IndexWriterConfig config = new IndexWriterConfig(Version.LUCENE_4_10_0,
				analyzer);
		IndexWriter w = new IndexWriter(dir, config);
		indexDocs(w, docDir);
		w.close();

	}

	public static void indexDocs(IndexWriter writer, File file)
			throws IOException {
		if (file.isDirectory()) {
			String[] files = file.list();
			if (files != null) {
				for (int i = 0; i < files.length; i++) {
					indexDocs(writer, new File(file, files[i]));
				}
			}
		} else {
			FileInputStream fis = new FileInputStream(file);
			JsonReader reader = new JsonReader(new InputStreamReader(fis,
					"UTF-8"));
			Gson gson = new Gson();
			Map<String, Object> map = new HashMap<String, Object>();
			map = (Map<String, Object>) gson.fromJson(reader, map.getClass());
			String content = (String) map.get("content");
			String mid = (String) map.get("mid");
			String time = (String) map.get("time");
			String user_sname = (String) map.get("user_sname");
			System.out.println("content: " + map.get("content"));
			Document doc = new Document();
			Field contentField = new TextField("content", content,
					Field.Store.YES);
			doc.add(contentField);
			doc.add(new StoredField("mid", mid));
			doc.add(new StoredField("time", time));
			doc.add(new StoredField("user_sname", user_sname));
			// doc.add
			writer.addDocument(doc);
			fis.close();
		}
	}
}