fix code

hutool-poi/src/main/java/cn/hutool/poi/excel/WorkbookUtil.java

@@ -159,13 +159,11 @@ public class WorkbookUtil {
 	 * @since 4.1.0
 	 */
 	public static Workbook createBook(boolean isXlsx) {
-		Workbook workbook;
-		if (isXlsx) {
-			workbook = new XSSFWorkbook();
-		} else {
-			workbook = new org.apache.poi.hssf.usermodel.HSSFWorkbook();
+		try {
+			return WorkbookFactory.create(isXlsx);
+		} catch (IOException e) {
+			throw new IORuntimeException(e);
 		}
-		return workbook;
 	}
 
 	/**

hutool-poi/src/test/java/cn/hutool/poi/excel/WorkbookUtilTest.java

@@ -0,0 +1,17 @@
+package cn.hutool.poi.excel;
+
+import org.apache.poi.ss.usermodel.Workbook;
+import org.junit.Assert;
+import org.junit.Test;
+
+public class WorkbookUtilTest {
+
+	@Test
+	public void createBookTest(){
+		Workbook book = WorkbookUtil.createBook(true);
+		Assert.assertNotNull(book);
+
+		book = WorkbookUtil.createBook(false);
+		Assert.assertNotNull(book);
+	}
+}