how to return excel in Struts2 result?

Question

I am trying to return an Excel sheet from my struts2 action class.

I am not sure what result-type should I be using? Has anyone tried to return an excel from strut

Answer 1

If you need to dynamically generate an Excel file using POI/HSSF and return in Struts 2,

JSP

Click to Download

Action Method

@Action(value = "DownloadExcel")
public void download() throws Exception {
    
    HttpServletRequest request = ServletActionContext.getRequest();
    HttpServletResponse response = ServletActionContext.getResponse();
    
    String filename = "report.xlsx"; // or any other filename strategy
    String mimeType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
    String characterEncoding = response.getCharacterEncoding();
    if (characterEncoding != null) {
        mimeType += "; charset=" + characterEncoding;
    }
    response.setContentType("application/octet-stream");
    response.setHeader("Content-Disposition", "attachment;filename=" + filename);

    XSSFWorkbook workbook = new XSSFWorkbook();
    XSSFSheet sheet = workbook.getSheetAt(0);
    // Fill out workbook as necessary... (simple example)
    XSSFRow row = sheet.createRow(0);
    XSSFCell cell = row.createCell(0);
    cell.setCellValue("test");
    //...

    ServletOutputStream out = null;
    try {
        out = response.getOutputStream();
        workbook.write(out);
        workbook.close();
    } catch (IOException e) {
        log.error("Failed to write into response - fileName=" + filename + ", mimeType=" + mimeType, e);
    }
    finally {
        if (out != null) {
            out.flush();
            out.close();
        }
    }
}