SpringBoot注解实现下载功能

@Download(source = "classpath:/download/README.txt")
@GetMapping("/classpath")
public void classpath() {
}
@Download
@GetMapping("/file")
public File file() {
    return new File("/Users/Shared/README.txt");
}
@Download
@GetMapping("/http")
public String http() {
    return "http://127.0.0.1:8080/concept-download/image.jpg";
}

@Download(filename = "二维码.zip")
@GetMapping("/download")
public List<Device> download() {
    return deviceService.all();
}
public class Device {
    //设备名称
    private String name;
    //设备二维码
    //注解表示该http地址是需要下载的数据
    @SourceObject
    private String qrCodeUrl;
    //注解表示文件名称
    @SourceName
    public String getQrCodeName() {
        return name + ".png";
    }
    /