HSSFWorkbook 지원 추가

src/main/java/cokr/xit/base/docs/xls/XLS.java

@@ -30,7 +30,9 @@ public abstract class XLS extends AbstractComponent {
 	protected Row row;
 	/**현재 처리 중인 cell*/
 	protected Cell cell;
-	protected boolean sxssf;
+	protected boolean
+		sxssf,
+		eager;
 
 	/**주어진 InputStream을 로드한다.
 	 * @param <T> XLS 유형
@@ -96,9 +98,10 @@ public abstract class XLS extends AbstractComponent {
 		try {
 			sheet = workbook().getSheetAt(index);
 		} catch (Exception e) {
-			if (sxssf) {
+			if (eager) {
 				sheet = workbook().createSheet();
-				((SXSSFSheet)sheet).setRandomAccessWindowSize(rowAccessWindowSize);
+				if (sxssf)
+					((SXSSFSheet)sheet).setRandomAccessWindowSize(rowAccessWindowSize);
 			}
 		}
 
@@ -120,9 +123,10 @@ public abstract class XLS extends AbstractComponent {
 		try {
 			Workbook wb = workbook();
 			sheet = wb.getSheet(name);
-			if (sheet == null && sxssf) {
+			if (sheet == null && eager) {
 				sheet = wb.createSheet(name);
-				((SXSSFSheet)sheet).setRandomAccessWindowSize(rowAccessWindowSize);
+				if (sxssf)
+					((SXSSFSheet)sheet).setRandomAccessWindowSize(rowAccessWindowSize);
 			}
 
 			if (!equals(sheet, worksheet)) {
@@ -143,7 +147,7 @@ public abstract class XLS extends AbstractComponent {
 	 */
 	public XLS row(int index) {
 		row = worksheet.getRow(index);
-		if (row == null && sxssf)
+		if (row == null && eager)
 			row = worksheet.createRow(index);
 		return this;
 	}
@@ -155,7 +159,7 @@ public abstract class XLS extends AbstractComponent {
 	 */
 	public XLS col(int index) {
 		cell = row != null ? row.getCell(index) : null;
-		if (cell == null && sxssf)
+		if (cell == null && eager)
 			cell = row.createCell(index);
 		return this;
 	}

src/main/java/cokr/xit/base/docs/xls/XLSWriter.java

@@ -16,6 +16,7 @@ import java.util.stream.IntStream;
 
 import org.apache.poi.ss.usermodel.CellStyle;
 import org.apache.poi.ss.usermodel.Workbook;
+import org.apache.poi.ss.usermodel.WorkbookFactory;
 import org.apache.poi.ss.util.CellRangeAddress;
 import org.apache.poi.xssf.streaming.SXSSFSheet;
 import org.apache.poi.xssf.streaming.SXSSFWorkbook;
@@ -49,9 +50,16 @@ public class XLSWriter extends XLS {
 
 	@Override
 	protected Workbook newWorkbook(InputStream input) throws Exception {
-		return input == null ?
-			new SXSSFWorkbook(rowAccessWindowSize) :
-			new SXSSFWorkbook(new XSSFWorkbook(input), rowAccessWindowSize);
+		eager = true;
+		if (input == null)
+			return new SXSSFWorkbook(rowAccessWindowSize);
+
+		Workbook created = WorkbookFactory.create(input);
+
+		if (created instanceof XSSFWorkbook xssf)
+			return new SXSSFWorkbook(xssf, rowAccessWindowSize);
+
+		return created;
 	}
 
 	@Override