如何在“另存为”对话框中打印文本在servlet中显示

时间：2021-03-01 20:46:34

I am having a program which picks a pdf file and let user download it. I do use OutputStream for that and it works fine.

我有一个程序,它选择一个pdf文件,让用户下载它。我确实使用OutputStream,它工作正常。

However, on the same page, I want to display a text (on an actual website, for the user).

但是,在同一页面上,我想显示一个文本(在实际网站上,为用户)。

I have tried the PrintWriter but that was in contrary with the OutputStream, throwing an error saying I can't use them at the same time. So I decided to use ServletOutputStream's print() which didn't work. For some reason nothing was printed on the screen.

我尝试过PrintWriter,但这与OutputStream相反,抛出一个错误,说我不能同时使用它们。所以我决定使用ServletOutputStream的print(),它不起作用。出于某种原因,屏幕上没有打印出任何内容。

CODE:

File pdfFile = new File(filePath);

    response.setContentType("application/pdf");
    response.addHeader("Content-Disposition", "attachment; filename="
            + "EloquaEmail.pdf");
    response.setContentLength((int) pdfFile.length());

    FileInputStream fileInputStream = new FileInputStream(pdfFile);
    OutputStream responseOutputStream = response.getOutputStream();
    int bytes;
    while ((bytes = fileInputStream.read()) != -1) {
        responseOutputStream.write(bytes);
    }
// SOMEWHERE HERE I WOULD LIKE TO PRINT OUT THE TEXT (Some variable)
// I've tried:
//      ServletOutputStream responseOutputStream = response.getOutputStream();
//      PrintWriter responseOutputStream = response.getWriter();
//      responseOutputStream.print(Main.htmlCode);
//      responseOutputStream.close();

EDIT: Or would it be possible to open a new JSP page (besides the one with the save as dialog), passing the text variable? You know to simulate target=_blank from within the servlet class?

编辑:或者是否可以打开一个新的JSP页面(除了带有另存为对话框的页面),传递文本变量?你知道从servlet类中模拟target = _blank吗?

I have tried this:

我试过这个:

String message = Main.htmlCode;
request.setAttribute("message", message); // This will be available as ${message}
request.getRequestDispatcher("../WebContent/DownloadHtmlCode.jsp").forward(request, response);

Throws this error:

抛出此错误:

java.lang.IllegalStateException: Cannot forward after response has been committed

1 个解决方案

#1

You normally do that, by adding to your a jsp page which contains your text in meta tag:

您通常会这样做,通过添加到包含元标记中文本的jsp页面:

 String message = Main.htmlCode;
 response.setHeader("Refresh", "5;url=Display.jsp?message="+message);

#1

You normally do that, by adding to your a jsp page which contains your text in meta tag:

您通常会这样做,通过添加到包含元标记中文本的jsp页面:

 String message = Main.htmlCode;
 response.setHeader("Refresh", "5;url=Display.jsp?message="+message);
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