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需求:通过二维码下载apk文件
1,创建springboot项目(新建maven项目)
2.创建包和类
3.源码
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import sun.misc.BASE64Encoder;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.URLEncoder;
import java.nio.channels.Channels;
import java.nio.channels.FileChannel;
import java.nio.channels.WritableByteChannel;
@Controller
@RequestMapping(value = "/downwanz")
public class DownApk {
@RequestMapping(value = "/appwanzas")
public static void DownLoadApp(HttpServletRequest request, HttpServletResponse response) throws UnsupportedEncodingException {
//apk文件的路径 C:\Users\Administrator\Desktop\app\20210923
String apkPath = "C:\\webUpload\\apk\\20210923";
String apkName = "xxxxxappName.apk";
//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========无语!!!!!!!
String fileName = "xxxxxappName";
// 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
filenameEncoder = URLEncoder.encode(apkName, "utf-8");
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 + ".apk");
} 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 + "\\" + apkName;
//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", "application/octet-stream");
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();
}
}
}
}
4, 将 ip + (端口)=======> localhost:8079/downwanz/appwanzas/ 直接访问下载apk文件
在线生成二维码地址:草料二维码
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