Question

我有一个GWTP应用程序，可以使用Apache POI将一些数据导出到.xlsx文件。这是我的演示者代码。

protected void exportTable(String selectedPublisher, String selectedTarget, Drilldown drilldown) {
    this.excelServiceAsync.generateDataEnrichmentExport(selectedPublisher, new AsyncCallback<Void>() {
        @Override
        public void onSuccess(Void result) {
            Window.open(GWT.getModuleBaseURL() + "rpc/excelDownload", "_blank", "");    
        }

        @Override
        public void onFailure(Throwable caught) {
            Window.alert("Error!"); 
        }
    });

}

这是我的excel生成代码，由演示者异步调用。

workbook = new XSSFWorkbook();
sheetOne = workbook.createSheet("Export One");

// TODO Typical POI coding stuff

FileOutputStream out = null;

try {
    out = new FileOutputStream(new File("file.xlsx"));
    workbook.write(out);    
} catch (FileNotFoundException e) { 
    e.printStackTrace();
} catch (IOException e) {
    e.printStackTrace();
}

这是我用来下载excel文件的控制器。

@ResponseBody
@RequestMapping(value = "/excelDownload")
public String downloadExcel(HttpServletRequest request, HttpServletResponse response){

    File file = new File("file.xlsx");

    response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
    response.setHeader("Content-Disposition", "attachment; filename="
            + "file.xlsx");
    response.setHeader("Content-Length", String.valueOf(file.length()));

    FileInputStream is = null;

    try {
        is = new FileInputStream(file);
        IOUtils.copy(is, response.getOutputStream());

        response.flushBuffer();
        response.getOutputStream().close();
    } catch (FileNotFoundException e) {
         logger.error(e.getMessage(), e.getCause());
    } catch (IOException e) {
         logger.error(e.getMessage(), e.getCause());
    } finally {
        try {
            is.close();
        } catch (Exception ex) {
            return "redirect:/error/internal";
        }
    }

    return "";
}

我正在生成excel文件并输出输出流。然后在控制器中，我从输出流中获取数据以作为.xlsx文件下载。这不起作用。生成工作文件并将其保存在服务器上。但是浏览器下载的文件是损坏的文件。我不确定为什么。请帮忙！

Answer 1

您忘了关闭FileOutputStream out。也许尝试使用try (resource) {...} syntax of Java7？

Answer 2

尝试设置response.setContentLength((int) file.length());

Spring + GWTP：从OutputStream下载Excel文件无法正常工作

2 个答案: