csv - 下载 CSV 文件时出错

Question

当我在我的应用程序中添加数据时，它会保存在 CSV 文件中。我还有另一种选择来下载相同的 CSV 文件。但它给出了错误。我的代码是：

String csvPath = Utility.getTestCSVFilePath();

        response.setContentType("application/x-download");

        response.setHeader("Content-Disposition", "attachment;filename=\"" +test.getTestName()+".csv"+ "\"");

        PrintWriter responseOut = null;

        try {
            responseOut = response.getWriter();
            InputStream inputStream = new FileInputStream(csvPath);
            OutputStream out = response.getOutputStream();
            IOUtils.copy(inputStream, out);
            out.flush();
            out.close();
            inputStream.close();
        } catch (IOException e) {
            responseOut.write("Some error has occurred while preparing the file for download.");
        }   

当我调试代码时，它在该行中给出错误：

OutputStream out = response.getOutputStream();

什么问题，请帮忙。

Answer 1

尝试移动这条线 responseOut = response.getWriter();

后

inputStream.close();看看它是否有效