spring boot项目标签管理+分类管理

1 分类管理
表现层设计如下

@Controller
@RequestMapping("/admin")
public class TypeController {

    @Autowired
    TypeService typeService;

    @GetMapping("/types")
    public String types(@PageableDefault(size = 5, sort = {"id"}, direction = Sort.Direction.DESC) Pageable pageable, Model model){
        model.addAttribute("page",typeService.listType(pageable));
        return "/admin/types";
    }
}

业务层中listType()实现如下所示

public interface TypeService {

     // 分页查询
    List<Type> listType(Pageable pageable);
}

@Service
public class TypeServiceImpl implements TypeService {

    @Autowired
    TypeRepository typeRepository;
    
    @Transactional
    @Override
    public Page<Type> listType(Pageable pageable) {
        return typeRepository.findAll(pageable);
    }
}

编辑操作对应的后端逻辑为

@PostMapping("/types/{id}")
public String editPost(@Valid Type type, BindingResult result,@PathVariable Long id, RedirectAttributes attributes) {
    // 根据前端传来的Type对象的name字段来验证是否是当前已有的类别
    Type type1 = typeService.getTypeByName(type.getName());
    if (type1 != null) {
        result.rejectValue("name","nameError","不能添加重复的分类");
    }
    // 如果输入不合法，重新跳转到输入页
    if (result.hasErrors()) {
        return "admin/types-input";
    }
    // 否则更新数据库中给定id的类别信息
    Type t = typeService.updateType(id,type);
    // 根据更新操作的结果给出提示信息
    if (t == null ) {
        attributes.addFlashAttribute("message", "更新失败");
    } else {
        attributes.addFlashAttribute("message", "更新成功");
    }
    
    // 最后重定向回类别管理页，显示最新的类别列表
    return "redirect:/admin/types";

更新操作的业务层实现为

public interface TypeService {

    // 更新类别
    Type updateType(Long id, Type type);
}

@Transactional
@Override
public Type updateType(Long id, Type type) {
    // 首先验证给定id对应的类别是否存在，如果不存在直接抛异常
    Type type1 = typeRepository.getOne(id);
    if (type1 == null){
        throw new NotFoundException("不存在该类型");
    }
    // 否则执行更新操作
    BeanUtils.copyProperties(type, type1);
    return typeRepository.save(type1);
}

删除操作的实现

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

public interface TypeService {
    
    // 删除类别
    void deleteType(Long id);
}

@Service
public class TypeServiceImpl implements TypeService {

    @Autowired
    TypeRepository typeRepository;

    @Transactional
    @Override
    public void deleteType(Long id) {
        typeRepository.deleteById(id);
    }
}

2 标签管理
表现层：

@Controller
@RequestMapping("/admin")
public class TagController {

    @Autowired
    private TagService tagService;

    @GetMapping("/tags")
    public String tags(@PageableDefault(size = 3,sort = {"id"},direction = Sort.Direction.DESC)
                               Pageable pageable, Model model) {
        model.addAttribute("page",tagService.listTag(pageable));
        return "admin/tags";
    }

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

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


    @PostMapping("/tags")
    public String post(@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");
        }
        if (result.hasErrors()) {
            return "admin/tags-input";
        }
        Tag t = tagService.saveTag(tag);
        if (t == null ) {
            attributes.addFlashAttribute("message", "新增失败");
        } else {
            attributes.addFlashAttribute("message", "新增成功");
        }
        return "redirect:/admin/tags";
    }


    @PostMapping("/tags/{id}")
    public String editPost(@Valid Tag tag, BindingResult result,@PathVariable Long id, RedirectAttributes attributes) {
        Tag tag1 = tagService.getTagByName(tag.getName());
        if (tag1 != null) {
            result.rejectValue("name","nameError","不能添加重复标签");
        }
        if (result.hasErrors()) {
            return "admin/tags-input";
        }
        Tag t = tagService.updateTag(id,tag);
        if (t == null ) {
            attributes.addFlashAttribute("message", "更新失败");
        } else {
            attributes.addFlashAttribute("message", "更新成功");
        }
        return "redirect:/admin/tags";
    }

    @GetMapping("/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";
    }
}

业务层:

@Service
public class TagServiceImpl implements TagService {

    @Autowired
    private TagRepository tagRepository;

    @Transactional
    @Override
    public Tag saveTag(Tag tag) {
        return tagRepository.save(tag);
    }

    @Transactional
    @Override
    public Tag getTag(Long id) {
        return tagRepository.getOne(id);
    }

    @Transactional
    @Override
    public Page<Tag> listTag(Pageable pageable) {
        return tagRepository.findAll(pageable);
    }


    @Transactional
    @Override
    public Tag updateTag(Long id, Tag tag) {
        Tag t = tagRepository.getOne(id);
        if (t == null) {
            throw new NotFoundException("不存在该标签");
        }
        BeanUtils.copyProperties(tag,t);
        return tagRepository.save(t);
    }

    @Transactional
    @Override
    public void deleteTag(Long id) {
        tagRepository.deleteById(id);
    }
}

效果展示