遍历lucene索引库的字段名

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try {
		Collection<String> fn = null;
		String[] idxFields = null;
		IndexReader reader = IndexReader.open(ramDir);
		System.out.println("索引文档列表……");
		fn = reader.getFieldNames(IndexReader.FieldOption.ALL);
		if (fn.size() == 0) {
		       System.out.println("Empty index.");
		}
		TreeSet<String> fields = new TreeSet<String>(fn);
		idxFields = (String[])fields.toArray(new String[fields.size()]);
		for (int i = 0; i < idxFields.length; i++) {
			System.out.println(idxFields[i]);
		}
} catch (Exception e) {
	e.printStackTrace();
}