[FIXED] How to make REST api that can redirect to url in SpringBoot

Issue

I have created a REST api which can used to save different urls those url have auto-increment feature that assign them an id one endpoint is to add urls and other is to fetch urls from id I want to do something like if I pass localhost:8080/getUrlById?id=4/ my browser should redirect me to that url which is there at 4th no.

my controller code -

@GetMapping("/addUrl")
public ResponseEntity<?> addUrlByGet(String url) {
    return new ResponseEntity<>(sortnerService.addUrlByGet(url),HttpStatus.OK);
}


@GetMapping("/findUrlById")
    public ResponseEntity<?> findSortnerById(Integer id){
    return new ResponseEntity<>(sortnerService.findUrlById(id), HttpStatus.OK);
}

service class -

@Service
public class SortnerService {
    @Autowired
    private  SortnerRepo sortnerRepo;

    public Sortner addUrlByGet(String url) {
        Sortner sortner = new Sortner();
        sortner.setUrl(url);
        return  sortnerRepo.save(sortner);
    }

//   finding by particular Id

   public List<Sortner> findUrlById(Integer id){
        return sortnerRepo.findSortnerById(id);
   }
}

Can anyone suggest me any way to do it I am really new to SpringBoot Sorry if I have made any silly mistake.

Solution

Based on the information from the comments, I suggest that the Sortner class looks like this:

  public class Sortner {
    Long id;
    URL url;
  }

So to redirect to the URL by the Id from your service you need to rewrite your controller to look like this:

  @GetMapping("/findUrlById")
  public void findSortnerById(Integer id, HttpServletResponse response) throws IOException {
    List<Sortner> urls = sortnerService.findUrlById(id);
    if(urls != null && urls.size() > 0) {
        response.sendRedirect(urls.get(0).getUrl().toString());
    }
    response.sendError(HttpServletResponse.SC_NOT_FOUND)
  }

• response.sendRedirect redirects to the required URL
• response.sendError returns 404 as the URL cannot be found in the database

Answered By - VadymVL