读取流文件文件名被更改

@RestController
public class ReadAppController {
    //文件的名字
    @Value("${app.name}")
    private String appName;
    
    @GetMapping("get/app")
    private void getAPP(HttpServletResponse response) throws IOException {
        
        File file = new File("src/main/resources/static/" + appName);
        InputStream br = new FileInputStream(file);
        OutputStream out = response.getOutputStream();
　　　　　　//设置返回文件的名字
        response.setHeader("Content-Disposition",
                "inline; filename=" + URLEncoder.encode(appName, "UTF-8"));
　　　　　　//设置返回值的类型
        response.setHeader("content-type", "application/octet-stream");
        
        byte[] buf = new byte[1024];
        int len = 0;
        while ((len = br.read(buf)) != -1) {
            out.write(buf, 0, len);
        }
        //关闭资源
        br.close();
        out.close();
        
    }
}