coldfusion - Apache POI XSSF header 未创建

Question

当我尝试创建 xlsx 时，我一直在创建 header 。我能够创建一个包含行和合并单元格的文件，但标题似乎永远不起作用。这是我所拥有的:

var WorkBook = CreateObject( 
    "java",
    "org.apache.poi.xssf.usermodel.XSSFWorkbook"
).Init();

var Sheet = WorkBook.CreateSheet(
    JavaCast( "string", 'my sheetname' )
);

// create the default header if it doesn't exist
var header = sheet.getHeader(); // have also tried getEvenHeader() and getOddHeader()

header.setText('&LLeft Section');
// have also tried the following:
//header.setLeft('left header');
//header.setCenter('CENTER');
//header.setRight('right header');

// open the file stream
var FileOutputStream = CreateObject(
    "java",
    "java.io.FileOutputStream"
).Init(
    JavaCast( "string", filename )
);

// Write the workbook data to the file stream.
WorkBook.Write( 
    FileOutputStream 
);

// Close the file output stream.
FileOutputStream.Close();

当我运行此代码时，没有抛出任何错误。文件已创建并且可以打开而不会引发任何错误，但不会出现标题。就像我说的，如果我创建行/单元格而不是标题，那么它们就会正确创建。我错过了什么？

编辑:正如 Leigh 在下面指出的那样，页眉/页脚在 Excel 中的含义与我对它们的理解(如在 PDF 中)不同。我对在 Excel 中添加标题将其显示在第一行上方的方式感到困惑，并认为通过 POI 添加标题会做同样的事情。

Answer 1

(从评论中推广，以防答案对下一个人有帮助)

愚蠢的问题，但是你如何验证 header 不存在？在 Excel 中，headers and footers should only be visible when printing (or in print preview mode) 。

...Headers and footers are not displayed on the worksheet in Normal view — they are displayed only in Page Layout view and on the printed pages.

FWIW，在我填充至少一个单元格后(因此有一些东西要打印)，该代码在 CF10 和 11 下对我来说工作得很好。

Runnable Example on trycf.com

<cfscript>
    workBook = CreateObject( "java", "org.apache.poi.xssf.usermodel.XSSFWorkbook").Init();
    sheet = WorkBook.CreateSheet( JavaCast( "string", 'my sheetname' ) );
    header = sheet.getHeader(); // have also tried getEvenHeader() and getOddHeader()
    header.setText('&LLeft Section');
    // add some data so there is something to print
    sheet.createRow(0).createCell(0).setCellValue("sample value");
    // Using binary stream because trycf.com does not support files for security reasons
    baos = createObject("java", "java.io.ByteArrayOutputStream").init();
    // Write the workbook data to the binary stream
    workBook.write( baos );
    baos.close();
</cfscript>

<!--- CF10 lacks support for script version of cfcontent --->
<cfcontent type="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
    variable="#baos.toByteArray()#">