一尘不染

在jsp中下载任何文件格式的内容类型应该是什么?

jsp

我想规定要下载所有文件类型…有没有办法下载jsp中的任何文件格式…

我的代码段:

    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,则会下载pdf,文本,doc文件…。但是问题在于图像文件…

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,但找不到正确的答案…谢谢…


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2020-06-10

共1个答案

一尘不染

最后,我以某种方式设法做到了……问题出在JSP的“ Out.write”上,它无法写入字节流……

我用servlet替换了jsp文件…

该代码段是:

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了。

感谢您的回应:)

2020-06-10