Spring provides the following option to pass attributes(params) to the redirect page by using RedirectAttributes.
#Controller
#RequestMapping("/")
public class RedirectController {
#GetMapping("/redirectWithRedirectView")
public ModelAndView redirectWithUsingRedirectView(RedirectAttributes attributes) {
attributes.addAttribute("attribute", "redirectWithRedirectView");
return new ModelAndView("redirect:redirectedUrl");
}
}
The same can be achieved even if we simply append attribute to redirect URL, like the following
#Controller
#RequestMapping("/")
public class RedirectController {
#GetMapping("/redirectWithRedirectView")
public ModelAndView redirectWithUsingRedirectView() {
return new ModelAndView("redirect:redirectedUrl?attribute=redirectWithRedirectView");
}
}
Both do the same job. Do we get any benefits in terms of memory if we use RedirectAttributes? I am guessing, in the second case, we would be constructing separate ModelAndView object if the attribute value changes for each request.
Related
I am trying to route url with and without parameter to two different methods but for some reason it always start first one.
Here is controller code:
public class ProductController : Controller
{
[Route("")]
[Route("Product")] //If i delete this one then it works how it is intended
public IActionResult Index()
{
//It always start this one
....
}
[Route("Product/{GroupID?}")]
public IActionResult Index(int GroupID)
{
....
}
}
What I basically want to know is this:
Suppose I have a method annotated with #RequestMapping and the value "/test/ajax". Can I make that specific method accessible only to internal calls but not to the client? If I run an ajax request on that url from within the server it should work normally, but if I run it directly from the browser it should return a 403.
Is that in any way possible?
add the spring annotation #CrossOrigin on controller layer for example
also, follow the given link https://spring.io/blog/2015/06/08/cors-support-in-spring-framework
#CrossOrigin
#RestController
#RequestMapping("/account")
public class AccountController {
#GetMapping("/{id}")
public Account retrieve(#PathVariable Long id) {
// ...
}
#DeleteMapping("/{id}")
public void remove(#PathVariable Long id) {
// ...
}
}
If you allow only a method pass like this
#RestController
#RequestMapping("/account")
public class AccountController {
#CrossOrigin
#GetMapping("/{id}")
public Account retrieve(#PathVariable Long id) {
// ...
}
#DeleteMapping("/{id}")
public void remove(#PathVariable Long id) {
// ...
}
}
I imported the Getting Started - Securing a Web Application in STS and added a controller for navigation, the request gets called and the return value instead of redirecting gets displayed in the browser. Any idea why it does this and how to fix it?
Here is the code:
#RestController
public class BetController {
#RequestMapping("/")
public String username(Model model) {
System.out.println("Test");
model.addAttribute("username", WebSecurityConfig.getUsername());
return "statpage";
}
The page start page is registered in this manner:
#Configuration
public class MvcConfig extends WebMvcConfigurerAdapter {
#Override
public void addViewControllers(ViewControllerRegistry registry) {
registry.addViewController("/").setViewName("startpage");
registry.addViewController("/login").setViewName("login");
}
All I get in the browser is a blank page with "startpage" on it, looking at the page's source there is no html just "startpage"
Returning ModelAndView instead of a String in the RequestMapping method solved the problem:
#RequestMapping("/")
public ModelAndView username(Model m) {
ModelAndView mav = new ModelAndView();
mav.addObject("username", WebSecurityConfig.getUsername());
mav.setViewName("betting");
return mav;
}
Another solution is changing #RestController to #Controller and making sure all the names match
spring mvc
#ModelAttribute("classname"),
How to make the argument "classname" a dynamic one ?
Whatever comes from view can get appended there.
Instantiation of the command object is the only place where Spring needs to know a command class. However, you can override it with #ModelAttribute annotated method:
#RequestMapping(method = RequestMethod.POST)
public void show(HttpServletRequest request,
#ModelAttribute("objectToShow") Object objectToShow)
{
...
}
#ModelAttribute("objectToShow")
public Object createCommandObject() {
return getCommandClass().newInstance();
}
By the way, Spring also works fine with the real generics:
public abstract class GenericController<T> {
#RequestMapping("/edit")
public ModelAndView edit(#ModelAttribute("t") T t) { ... }
}
#Controller #RequestMapping("/foo")
public class FooController extends GenericController<Foo> { ... }
Using Spring 3.2.3, I'm trying to implement a simple CRUD controller that handles REST-ful URLs. It relies on a PropertyEditor to convert a path variable to a BusinessService entity by loading it from an application service. Code is as follows:
#Controller
public class BusinessServiceController {
#Autowired
private BusinessServiceService businessSvcService;
public BusinessServiceController() {
}
#InitBinder
public void initBinder(final WebDataBinder binder) {
binder.registerCustomEditor(BusinessService.class, new BusinessServicePropertyEditor(businessSvcService));
}
#RequestMapping(value = "/ui/account/business-services/{businessSvc}", method = RequestMethod.POST, consumes = MediaType.APPLICATION_FORM_URLENCODED_VALUE)
public ModelAndView update(#ModelAttribute("businessSvc") #Valid final BusinessService businessSvc, final BindingResult result,
final RedirectAttributes redirectAttribs) throws UnknownBusinessServiceException {
ModelAndView mav;
if (result.hasErrors()) {
mav = new ModelAndView("/business-service/edit");
}
else {
businessSvcService.updateBusinessService(XSecurity.principal().getId(), businessSvc);
mav = new ModelAndView("redirect:/ui/account/business-services");
redirectAttribs.addFlashAttribute("message", Message.info("businessService.updated", businessSvc.getTitle()));
}
return mav;
}
}
public class BusinessServicePropertyEditor extends PropertyEditorSupport {
private final BusinessServiceService businessSvcService;
public BusinessServicePropertyEditor(final BusinessServiceService businessSvcService) {
this.businessSvcService = businessSvcService;
}
#Override
public String getAsText() {
final BusinessService svc = (BusinessService) getValue();
return Long.toString(svc.getId());
}
#Override
public void setAsText(final String text) {
final BusinessService svc = businessSvcService.getBusinessService(Long.parseLong(text));
setValue(svc);
}
}
According to SPR-7608, starting from Spring 3.2, #ModelAttribute method argument resolution checks if a path variable by the same name exists (it does here), in which case it tries to convert that path variable's value to the target parameter type through registered Converters and PropertyEditors. This is not what I'm experiencing. When I inspect what ServletModelAttributeMethodProcessor does, it clearly uses the request DataBinder's ConversionService to perform type conversion, which does not consider registered PropertyEditors, and hence BusinessServicePropertyEditor#setAsText is never called.
Is this a configuration problem or an actual bug?
Thanks for your help!
Spring's ConversionService and Converters are replacement for standard Java Beans PropertyEditors.
You need to implement Converter instead of PropertyEditor if this feature is based purely on conversion service.
To register your custom converters in WebDataBinder you might use ConfigurableWebBindingInitializer or #InitBinder method.