在jsp中下载任何文件格式的内容类型应该是什么？

Question

我想提供下载所有文件类型的规定...有没有办法在jsp中下载任何文件格式...

我的代码片段:

    String filename = (String) request.getAttribute("fileName");        
    response.setContentType("APPLICATION/OCTET-STREAM");
    String disHeader = "Attachment";
    response.setHeader("Content-Disposition", disHeader);

    // transfer the file byte-by-byte to the response object
    File fileToDownload = new File(filename);
    response.setContentLength((int) fileToDownload.length());
    FileInputStream fileInputStream = new FileInputStream(fileToDownload);
    int i = 0;
    while ((i = fileInputStream.read()) != -1) {
        out.write(i);
    }
    fileInputStream.close();

如果我将setContentType指定为APPLICATION/OCTET-STREAM,则pdf,text,doc文件将被下载....但问题出在图像文件中......

图像文件有什么问题？我想下载所有图像文件类型...

我搜索了类似的问题,但找不到合适的答案...谢谢......

Answer 1

最后我设法做到了......问题在于JSP的"Out.write",它不能写字节流......

我用servlet替换了jsp文件...

代码段是:

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    try {
        String filename = (String) request.getAttribute("fileName");
        response.setContentType("application/octet-stream");
        response.setHeader("Content-Disposition",
                "attachment;filename="+filename);

        File file = new File(filename);
        FileInputStream fileIn = new FileInputStream(file);
        ServletOutputStream out = response.getOutputStream();

        byte[] outputByte = new byte[(int)file.length()];
        //copy binary contect to output stream
        while(fileIn.read(outputByte, 0, (int)file.length()) != -1)
        {
        out.write(outputByte, 0, (int)file.length());
        }
     }

现在我可以下载所有类型的文件....

谢谢你的回应:)