java-SpringBoot的学习心得（3）——分类管理与标签

分类管理

上次已实现分页功能，这次新增编辑，删除，增加操作

1. 编辑:通过id来更改分类内容

@RequestMapping("/types/{id}/toUpdate")
    public String toUpdate(@PathVariable Long id,Model model){
        model.addAttribute("type",typeService.getType(id));
        return "admin/types-input";
    }

    @RequestMapping("/types/update/{id}")
    public String update(@Valid Type type,@PathVariable Long id,BindingResult result,RedirectAttributes attributes){
        System.out.println("type"+type);
        Type type1 = typeService.getTypeByName(type.getName());
        if(type1!=null){
             result.rejectValue("name","nameError","不能添加重复的分类");
        }
        if(result.hasErrors()){
            return "admin/types-input";
        }
        Type type2 = typeService.updateType(id, type);
        if(type2==null){
            attributes.addFlashAttribute("message","更新失败");
        }else{
            attributes.addFlashAttribute("message","更新成功");
        }
        return "redirect:/admin/types";
    }

2. 删除：通过id来删除

@RequestMapping("/types/{id}/delete")
    public String delete(@PathVariable Long id,RedirectAttributes attributes){
        typeService.delete(id);
        attributes.addFlashAttribute("message","删除成功");
        return "redirect:/admin/types";
    }

3. 添加：直接添加内容，id自动增加

    @GetMapping("/types/input")
    public String input(Model model){
        model.addAttribute("type",new Type());
        return "admin/types-input";
    }

    @PostMapping("/types/add")
    public String add(@Valid Type type, BindingResult result, RedirectAttributes attributes){
        Type type1 = typeService.getTypeByName(type.getName());
        if(type1!=null){
          result.rejectValue("name","nameError","不能添加重复的分类");

        }
        if(result.hasErrors()){
            return "admin/types-input";
        }
        Type type2 = typeService.saveType(type);
        if(type2==null){
            attributes.addFlashAttribute("message","新增失败");
        }else{
            attributes.addFlashAttribute("message","新增成功");
        }
        return "redirect:/admin/types";
    }

效果演示

1. 编辑： 输入同样内容会提示，编辑失败
   
   
   
2. 删除：点击删除小雨记1就被删除了
   
   
3. 添加：用的界面跟编辑一样
   
   
   

标签

标签的实现与分类类似，都是同样的操作

@GetMapping("/tags/input")
    public String input(Model model){
        model.addAttribute("tag",new Tag());
        return "admin/tags-input";
    }

    @PostMapping("/tags/add")
    public String add(@Valid Tag tag, BindingResult result, RedirectAttributes attributes){
        Tag tag1 =tagService.getTagByName(tag.getName());
        if(tag1!=null){
            result.rejectValue("name","nameError","不能添加重复的标签");
            System.out.println(result);
        }
        if(result.hasErrors()){
            return "admin/tags-input";
        }
        Tag tag2 = tagService.saveTag(tag);
        if(tag2==null){
            attributes.addFlashAttribute("message","更新失败");
        }else{
            attributes.addFlashAttribute("message","更新成功");
        }
        return "redirect:/admin/tags";
    }

    @RequestMapping("/tags/{id}/toUpdate")
    public String toUpdate(@PathVariable Long id,Model model){
        model.addAttribute("tag",tagService.getTag(id));
        return "admin/tags-input";
    }

    @RequestMapping("/tags/update/{id}")
    public String update(@Valid Tag tag, @PathVariable Long id, BindingResult result, RedirectAttributes attributes){
        System.out.println("type"+tag);
        Tag tag1 = tagService.getTagByName(tag.getName());
        if(tag1!=null){
            result.rejectValue("name","nameError","不能添加重复的分类");
        }
        if(result.hasErrors()){
            return "admin/types-input";
        }
        Tag tag2 = tagService.updateTag(id, tag);
        if(tag2==null){
            attributes.addFlashAttribute("message","更新失败");
        }else{
            attributes.addFlashAttribute("message","更新成功");
        }
        return "redirect:/admin/tags";
    }

    @RequestMapping("/tags/{id}/delete")
    public String delete(@PathVariable Long id,RedirectAttributes attributes){
        tagService.deleteTag(id);
        attributes.addFlashAttribute("message","删除成功");
        return "redirect:/admin/tags";
    }