Redirect to an external URL from controller action in Spring MVC

Question

I have noticed the following code is redirecting the User to a URL inside the project,

@RequestMapping(method = RequestMethod.POST) public String processForm(HttpServletRequest request, LoginForm loginForm,                            BindingResult result, ModelMap model)  {     String redirectUrl = "yahoo.com";     return "redirect:" + redirectUrl; } 

whereas, the following is redirecting properly as intended, but requires http:// or https://

@RequestMapping(method = RequestMethod.POST)     public String processForm(HttpServletRequest request, LoginForm loginForm,                                BindingResult result, ModelMap model)      {         String redirectUrl = "http://www.yahoo.com";         return "redirect:" + redirectUrl;     } 

I want the redirect to always redirect to the URL specified, whether it has a valid protocol in it or not and do not want to redirect to a view. How can I do that?

Thanks,

Answer 1

You can do it with two ways.

First:

@RequestMapping(value = "/redirect", method = RequestMethod.GET) public void method(HttpServletResponse httpServletResponse) {     httpServletResponse.setHeader("Location", projectUrl);     httpServletResponse.setStatus(302); } 

Second:

@RequestMapping(value = "/redirect", method = RequestMethod.GET) public ModelAndView method() {     return new ModelAndView("redirect:" + projectUrl); } 

Answer 2

You can use the RedirectView. Copied from the JavaDoc:

View that redirects to an absolute, context relative, or current request relative URL

Example:

@RequestMapping("/to-be-redirected") public RedirectView localRedirect() {     RedirectView redirectView = new RedirectView();     redirectView.setUrl("http://www.yahoo.com");     return redirectView; } 

You can also use a ResponseEntity, e.g.

@RequestMapping("/to-be-redirected") public ResponseEntity<Object> redirectToExternalUrl() throws URISyntaxException {     URI yahoo = new URI("http://www.yahoo.com");     HttpHeaders httpHeaders = new HttpHeaders();     httpHeaders.setLocation(yahoo);     return new ResponseEntity<>(httpHeaders, HttpStatus.SEE_OTHER); } 

And of course, return redirect:http://www.yahoo.com as mentioned by others.