Java从服务器端下载文件保存到本地,不是下载的图片?

public static void downloadFile(String urlPath, String filePath) throws IOException {
        URL url = new URL(urlPath);
        String name = urlPath.substring(urlPath.lastIndexOf("=")+1);
        String filePaths = filePath+"/"+name;
        File dirFile = new File(filePath);
        if (!dirFile.exists()) {
            dirFile.mkdir();
        }
        URLConnection connection = url.openConnection();
        InputStream in = connection.getInputStream();
        FileOutputStream os = new FileOutputStream(filePaths);
        byte[] buffer = new byte[4 * 1024];
        int read;
        while ((read = in.read(buffer)) > 0) {
            os.write(buffer, 0, read);
        }
        os.close();
        in.close();
    }

    public static void main(String[] args) {
        String urlPath = "http://10.192.32.111:80/production-jcw/getDownload.do?fileName=49e23d3a-5e11-432d-9f33-91c93130b37b.dwg";
        String filePath = "C:/Users/MrLi/Desktop/";
        try {
            downloadFile(urlPath, filePath);
            System.out.println("下载成功");
        } catch (IOException e) {
            e.printStackTrace();
            System.out.println("下载失败");
        }
    }
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