java - @RequestParam不同的URI

Question

@RequestMapping("/recipe/new")
public String newRecipe(Model model){

  model.addAttribute("recipe",new RecipeCommand());
  return "recipe/recipeform";   
}

@PostMapping("recipe")
public String  saveOrUpdate(@ModelAttribute RecipeCommand command){

  RecipeCommand recipeCommand=recipeService.saveRecipeCommand(command);
  return "redirect:/recipe/show/"+recipeCommand.getId();
}

我不明白为什么在 post 中只有一个正确的 URI @PostMapping("recipe") ，当我尝试例如 @PostMapping("/recipe/new") 时它不起作用

我想我不太明白在 @Mappings 中编写正确 URI 的规则，为什么只有 @PostMapping("recipe") 有效？'

这是正常的 Controller ，没有休息

Answer 1

Spring will consider @RequestMapping URI without method property as multiple mappings like POST: /recipe/new , GET: /recipe/new , PATCH:
/recipe/new ..

由于上述原因，@PostMapping("/recipe/new") 被视为重复映射，因此不起作用。

要解决此问题，请将请求方法属性添加到您的 newRecipe 方法

@RequestMapping("/recipe/new", method=RequestMethod.GET)
    public String newRecipe(Model model){
        model.addAttribute("recipe",new RecipeCommand());
        return "recipe/recipeform";
    }

@PostMapping("/recipe/new")
    public String  saveOrUpdate(@ModelAttribute RecipeCommand command){
       RecipeCommand recipeCommand=recipeService.saveRecipeCommand(command);
       return "redirect:/recipe/show/"+recipeCommand.getId();
    }