use redirect to void duplicate submission

《Spring in Action3》笔记：

@RequestMapping(method=RequestMethod.POST)
public StringaddSpitterFromForm(@Valid　Spitter　spitter,　BindingResult bindingResult){
　　if(bindingResult.hasErrors()){
　　     return"spitters/edit";
　　}
　　spitterService.saveSpitter(spitter);
　　return "redirect:/spitters/"+spitter.getUsername();
}

 

By　redirecting to another page, we can avoid duplicate submission of the form if the user
clicks the Refresh button in their browser.