Question

How can I rotate the text within an HSSFCell class of Apache POI?

Answer 1

Use HSSFCellStyle, that class has a method called setRotation(short rotation) which will rotate the text. All you do is apply the cell style to a cell:

HSSFCellStyle myStyle = workbook.createCellStyle();
myStyle.setRotation((short)90);

HSSFCell c = row.createCell(columnNumber);
c.setCellStyle(myStyle);