CREATE TABLE `t_url` (
 `id` int(10) NOT NULL AUTO_INCREMENT,
 `url` text NOT NULL,
 PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=15 DEFAULT CHARSET=utf8;

路由

@Path
public class IndexRoute {
    // 鹽值
  private static final Hashids HASHIDS = new Hashids("blade-shorturl");
   
  private UrlModel urlModel = new UrlModel();
 
  @Route("/:key")
  public void get(Request req, Response response) {
    String key = req.pathParam(":key").replaceAll("[^A-Za-z0-9]", "");
    long[] numbers = HASHIDS.decode(key);
 
    if (null == numbers || numbers.length < 1) {
      response.text("沒有找到");
      return;
    }
    int id = (int) numbers[0];
    String result = get(id).getUrl();
    if (result == null) {
      response.text("沒有找到");
      return;
    }
    response.redirect(result);
  }
   
  @Route(value = "/", method = HttpMethod.GET)
  public String index() {
    return "index";
  }
   
  @Route(value = "/", method = HttpMethod.POST)
  public String save(Request request, Response response) {
    String resJsp = "index";
     
    String longUrl = request.query("url");
     
    if (!isURL(longUrl)) {
      request.attribute("error", "無效的URL");
      return resJsp;
    }
     
    Integer id = this.save(longUrl);
    if (id == 0) {
      request.attribute("error", "保存失敗");
      return resJsp;
    }
     
    String hash = HASHIDS.encode(id);
    request.attribute("url_hash", hash);
     
    System.out.println("id = " + id + ",url_hash=" + hash);
     
    return resJsp;
  }
 
  private Integer save(String url) {
    return urlModel.insert().param("url", url).executeAndCommit();
  }
   
  private UrlModel get(int id) {
    return urlModel.fetchByPk(id);
  }
   
  private final String REGEX = "\\b(https?|ftp|file)://[-a-zA-Z0-9+&@#/%?=~_|!:,.;]*[-a-zA-Z0-9+&@#/%=~_|]";
   
  private boolean isURL(String url) {
    if(StringKit.isNotBlank(url)){
      Pattern pattern = Pattern.compile(REGEX);
      Matcher matcher = pattern.matcher(url);
      if (matcher.find()) {
        return true;
      }
    }
    return false;
  }
}

實現效果：