Generate QR code function
Prospect summary: Recently, we need to implement a function of automatically downloading page data by scanning the QR code on the mobile terminal.
Idea: We can only implement the QR code function first, and then talk about the download. Put the address into the QR code. It also needs to be adapted.
Implementation: See the code below.
This part can be referred to
this link: link
Implemented QR code and written download address
@RequestMapping(value = "/appwanzas")
public void DownLoadApp(HttpServletRequest request, HttpServletResponse response) throws UnsupportedEncodingException {
//apk文件的路径 C:\Users\Administrator\Desktop\app\20210923
//String apkPath = "C:\\Users\\user\\Pictures\\微信图片_20220628135215.jpg";
String apkPath = "C:\Users\Administrator\Desktop\app\20210923";
String apkName ="检查记录表.doc";
//为了单独解决，安卓手机火狐浏览器下载不显示中文或者乱码
String fileName = "检查记录表";
// 获得请求头中的User-Agent
String agent = request.getHeader("User-Agent");
// 根据不同的客户端进行不同的编码
String filenameEncoder = "";
if (agent.contains("MSIE")) {
// IE浏览器
try {
filenameEncoder = URLEncoder.encode(apkName, "utf-8");
} catch (UnsupportedEncodingException e) {
}
filenameEncoder = filenameEncoder.replace("+", " ");
//为了单独解决火狐浏览器下载不显示中文或者乱码
response.setHeader("Content-Disposition", "attachment;filename=" + filenameEncoder);
} else if (agent.contains("Firefox")) {
// 火狐浏览器 编码
BASE64Encoder base64Encoder = new BASE64Encoder();
//BASE64 解码
//BASE64Decoder decoder = new BASE64Decoder();
filenameEncoder = "=?utf-8?B?" + base64Encoder.encode(apkName.getBytes("utf-8")) + "?=";
//为了单独安卓手机解决火狐浏览器下载不显示中文或者乱码========无语！！！！！！！
fileName = new String(fileName.getBytes("utf-8"), "iso8859-1");
response.setHeader("Content-Disposition", "attachment;filename=" + fileName + ".doc");
} else {
// 其它浏览器
filenameEncoder = URLEncoder.encode(apkName, "utf-8");
//为了单独解决火狐浏览器下载不显示中文或者乱码
response.setHeader("Content-Disposition", "attachment;filename=" + filenameEncoder);
}
//apk文件的绝对路径
String apkPathfile =apkPath;
//new 一个apk的文件对象
File file = new File(apkPathfile);
try {
if(file.exists()){
downloadFile(file,response);
}
}catch(Exception e) {
System.out.println("下载文件错误"+e.getMessage());
}
}
private static void downloadFile(File file, HttpServletResponse response ){
OutputStream os=null;
try {
// 取得输出流
os = response.getOutputStream();
String contentType = Files.probeContentType(Paths.get(file.getAbsolutePath()));
//当前只下载apk格式文件 contentType
response.setHeader("Content-Type", contentType);
response.addHeader("Content-Length", "" + file.length());
FileInputStream fileInputStream = new FileInputStream(file);
WritableByteChannel writableByteChannel = Channels.newChannel(os);
FileChannel fileChannel = fileInputStream.getChannel();
fileChannel.transferTo(0,fileChannel.size(),writableByteChannel);
fileChannel.close();
os.flush();
writableByteChannel.close();
} catch (IOException e) {
e.printStackTrace();
}
//文件的关闭放在finally中
finally {
try {
if (os != null) {
os.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
Just put the download address into the content of the QR code
String path="http://localhost:8081"//可更改为线上地址
String text=path+"/public/app/appwanzas?rfbUuid="+model.getRfbUuid()+"&auuid="+account.getCractUuid()+"&name="+rfgcWhglRwgl.getRfbXmglMc();
String str = QrConfigUtill.generateQRCodeImage(text, 200, 200);