Form handling

gistfile1.txt

// list page
	@RequestMapping(value = "/users", method = RequestMethod.GET)
	public String showAllUsers(Model model) {

		logger.debug("showAllUsers()");
		model.addAttribute("users", userService.findAll());
		return "users/list";

	}

	// save or update user
	// 1. @ModelAttribute bind form value
	// 2. @Validated form validator
	// 3. RedirectAttributes for flash value
	@RequestMapping(value = "/users", method = RequestMethod.POST)
	public String saveOrUpdateUser(@ModelAttribute("userForm") @Validated User user,
			BindingResult result, Model model, 
			final RedirectAttributes redirectAttributes) {

		logger.debug("saveOrUpdateUser() : {}", user);

		if (result.hasErrors()) {
			populateDefaultModel(model);
			return "users/userform";
		} else {

			// Add message to flash scope
			redirectAttributes.addFlashAttribute("css", "success");
			if(user.isNew()){
			  redirectAttributes.addFlashAttribute("msg", "User added successfully!");
			}else{
			  redirectAttributes.addFlashAttribute("msg", "User updated successfully!");
			}
			
			userService.saveOrUpdate(user);
			
			// POST/REDIRECT/GET
			return "redirect:/users/" + user.getId();

			// POST/FORWARD/GET
			// return "user/list";

		}

	}