What to do if java ie has garbled characters

java What to do if ie is garbled? Java Use IE browser to download files, the file name is garbled

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When using Servlet to implement the file download function, the file name appears garbled when using IE to download;

A common solution on the Internet is to use "user-agen" "To determine the browser:

if (req.getHeader("user-agent").toLowerCase().contains("msie")) {  
        // IE  
    filename = URLEncoder.encode(filename, "UTF-8");  
} else {  
        // 非IE  
    filename = new String(filename.getBytes("UTF-8"), "iso-8859-1");  
}

But in Windows 10, the user agent string has been modified and is no longer "msie"

Compatible ("compatible") and browser ("MSIE" ) token has been deleted.

"like Gecko" token has been added (to be consistent with other browsers).

Browser versions are now reported by the new version ("rv") token.

win 10 ie user-agent
Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; rv:11.0) like Gecko ie 11
win 10 edge user-agent
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.79 Safari/537.36 Edge/14.14393 edge

So you cannot use msie to determine whether it is an IE browser.

String userAgent = req.getHeader("user-agent").toLowerCase();  
  
if (userAgent.contains("msie") || userAgent.contains("like gecko") ) {  
        // win10 ie edge 浏览器 和其他系统的ie  
    fileName = URLEncoder.encode(fileName, "UTF-8");  
} else {  
        // fe  
    fileName = new String(fileName.getBytes("UTF-8"), "iso-8859-1");  
}

Project sample code:

try {
                String fileName = attachmentFile.originalName();
                String userAgent = request.getHeader("user-agent").toLowerCase();  
                if (userAgent.contains("msie") || userAgent.contains("like gecko") ) {  
                        // win10 ie edge 浏览器 和其他系统的ie  
                    fileName = URLEncoder.encode(fileName, "UTF-8");  
                } else {  
                        // fe  
                    fileName = new String(fileName.getBytes("utf-8"), "iso-8859-1");  
                }  
                response.setCharacterEncoding("utf-8");
                response.setContentType("multipart/form-data");
                response.setHeader("Content-Disposition",
                        "attachment;fileName=" + fileName);
                String path = attachmentFile.path();
                InputStream inputStream = new FileInputStream(new File(path));
                OutputStream os = response.getOutputStream();
                byte[] b = new byte[2048];
                int length;
                while ((length = inputStream.read(b)) > 0) {
                    os.write(b, 0, length);
                }
                // 这里主要关闭。
                os.close();
                inputStream.close();
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }

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