Java implementation of a short address service method (with code) _java

If the following is a list of links to your video site, if people want to crawl your data is very easy, see the rules will know that the database is a sequential increase

Http://www.xxxx.com/video/1
Http://www.xxxx.com/video/2
Http://www.xxxx.com/video/3

So to solve this problem, we can use the short address, do not expose the real link, using symmetric encryption is a good solution.

Hashids is a good choice, it provides the implementation of Js/php/java/python and other programming languages, I use it here.

Below is the Java Short Address service I built based on the blade framework.

CREATE TABLE ' T_url ' (
 ' id ' int () NOT NULL auto_increment,
 ' url ' text not null,
 PRIMARY KEY (' id ')
) ENG Ine=innodb auto_increment=15 DEFAULT Charset=utf8;

Routing

@Path public class Indexroute {//Salt value 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 ("not Found");
    Return
    int id = (int) numbers[0];
    String result = Get (ID). GETURL ();
      if (result = = null) {Response.text ("not Found");
    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) {Strin
     
    G resjsp = "index";
     
    String Longurl = request.query ("url");
 if (!isurl (Longurl)) {Request.attribute ("error", "Invalid URL");     return resjsp;
    Integer id = this.save (longurl);
      if (id = = 0) {request.attribute ("error", "Save Failed");
    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; }
}

Implementation effect:

Code Location: Https://github.com/bladejava/blade-shorturl

The above is the entire content of this article, I hope to help you learn.