Java开发学习.Day8

基于Springboot实现 分类管理+标签管理

本文内容是基于Java开发学习.Day7内容上所实现的

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分类管理

该功能主要包括对Type对象的增删改查

代码实现

在dao.TypeRepository中添加findByName方法，根据name查找到对应的Type对象

package com.xxxxbt.news.dao;


import com.xxxxbt.news.po.Type;
import org.springframework.data.jpa.repository.JpaRepository;

public interface TypeRepository extends JpaRepository<Type,Long> {
	Type findByName(String name);

}

查找分类

在service.TypeService中添加查找分类getTypeByName的函数声明

public interface TypeService {

    Page<Type> listType(Pageable pageable);
    
    //查
    Type getTypeByName(String name);

}

在service.impl.TypeServiceImpl 中实现修改后的TypeService

@Service
public class TypeServiceImpl implements TypeService {

    @Autowired
    private TypeRepository typeRepository;

    @Override
    public Page<Type> listType(Pageable pageable) {
        return typeRepository.findAll(pageable); //findAll方法来自jpa
    }

    @Override
    public Type getTypeByName(String name) {
        return typeRepository.findByName(name);
    }

}

新增分类

在service.TypeService中添加新增分类的函数声明

public interface TypeService {

	//增
    Type saveType(Type type);


}

在service.impl.TypeServiceImpl 中实现修改后的TypeService

package com.xxxxbt.news.service.impl;


import com.xxxxbt.news.dao.TypeRepository;
import com.xxxxbt.news.po.Type;
import com.xxxxbt.news.service.TypeService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.stereotype.Service;

@Service
public class TypeServiceImpl implements TypeService {
    @Autowired
    private TypeService typeService;

    @Override
    public Type getTypeByName(String name) {
        return typeRepository.findByName(name);
    }

    @Override
    public Type saveType(Type type) {
        return typeRepository.save(type);
    }

}

最后在web.admin.TypeController添加新增分类的路由
用户在types/input路由中创建待提交的type对象，在type/add中执行新增操作

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

    @Autowired
    private TypeService typeService;

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

    @RequestMapping("/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";
    }

}

删除分类

在service.TypeService中添加删除分类的函数声明

public interface TypeService {


	//删
    void delete(Long id);



}

在service.impl.TypeServiceImpl 中实现修改后的TypeService

@Service
public class TypeServiceImpl implements TypeService {

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

}

最后在web.admin.TypeController添加删除类型路由
后台将根据type的id从数据库中执行删除

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

    @Autowired
    private TypeService typeService;


    @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";
    }

}

修改分类

在service.TypeService中添加修改分类的函数声明
修改包括两部分操作，先获取待修改Type的id，再执行修改操作

public interface TypeService {

    //改
    Type getType(Long id);

    Type updateType(Long id, Type type);


}

在service.impl.TypeServiceImpl 中实现修改后的TypeService

@Service
public class TypeServiceImpl implements TypeService {

    @Autowired
    private TypeRepository typeRepository;

    @Override
    public Type getType(Long id) {
        return typeRepository.findById(id).orElse(null);
    }

    @Override
    public Type updateType(Long id, Type type) {
        Type type1 = typeRepository.findById(id).orElse(null);
        if(type1==null){
            System.out.println("未获得更新对象");
            return null;
        }
        BeanUtils.copyProperties(type,type1);
        return typeRepository.save(type1);
    }
}

最后在web.admin.TypeController添加修改分类的新路由，
先获取用户待修改的type操作，再由后台将修改后的数据更新数据库

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

    @Autowired
    private TypeService typeService;

    @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,BindingResult result,@PathVariable Long id,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.updateType(id,type);
        if(type2!=null){
            attributes.addFlashAttribute("message","更新成功");
        }
        else {

            attributes.addFlashAttribute("message","更新失败");
        }
        return "redirect:/admin/types";
    }

}

功能展示

查询

新增

修改

删除

标签管理

代码实现

由于代码实现思路方面和类型管理大致相同，在此就不在分功能赘述
现在po中创建tag实体类

@Entity
@Table(name = "t_tag")
public class Tag {

    @Id
    @GeneratedValue(strategy =  GenerationType.IDENTITY)  //自增
    private Long id;
    @NotBlank(message = "标签名称不能为空")
    private String name;

//    @ManyToMany


    public Tag() {
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    @Override
    public String toString() {
        return "Tag{" +
                "id=" + id +
                ", name='" + name + '\'' +
                '}';
    }
}

再在dao中创建TagRepository 接口

public interface TagRepository extends JpaRepository<Tag,Long> {
    Tag findByName(String name);
}

在service中创建TagService 接口

public interface TagService {

    //查询
    Page<Tag> listTag(Pageable pageable);

    //新增
    Tag saveTag(Tag tag);

    Tag getTagByName(String name);

    //删除
    void deleteTag(Long id);

    //编辑
    Tag getTag(Long id);

    Tag update(Long id, Tag tag);
}

在Service.impl中实现TagService 接口

@Service
public class TagServiceImpl implements TagService {

    @Autowired
    private TagRepository tagRepository;

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

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


    @Override
    public Tag getTagByName(String name) {
        return tagRepository.findByName(name);
    }

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

    @Override
    public Tag getTag(Long id) {
        return tagRepository.findById(id).orElse(null);
    }

    @Override
    public Tag update(Long id, Tag tag) {
        Tag tag1 = tagRepository.findById(id).orElse(null);
        if(tag1==null){
            System.out.println("获取更新对象出错");
            return null;
        }
        BeanUtils.copyProperties(tag,tag1);
        return tagRepository.save(tag1);
    }
}

最后在web.admin中添加控制器TagController

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

    @Autowired
    private TagService tagService;

    @RequestMapping("/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";
    }

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

    @RequestMapping("/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","不能添加重复的分类");
        }
        if(result.hasErrors()){
            return "admin/tags-input";
        }
        Tag tag2 = tagService.saveTag(tag);
        if(tag2==null){
            attributes.addFlashAttribute("message","新增失败");
        }else{
            attributes.addFlashAttribute("message","新增成功");
        }

        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";
    }

    @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, BindingResult result, @PathVariable Long id, RedirectAttributes attributes){
        Tag tag1 = tagService.getTagByName(tag.getName());
        if(tag1!=null){
            result.rejectValue("name","nameError","不能添加重复的分类");
        }
        if(result.hasErrors()){
            return "admin/tags-input";
        }
        Tag tag2 = tagService.update(id,tag);
        if(tag2!=null){
            attributes.addFlashAttribute("message","更新成功");
        }
        else {

            attributes.addFlashAttribute("message","更新失败");
        }
        return "redirect:/admin/tags";
    }

}

功能展示

查询及分页

新增

修改

删除

本文地址：https://blog.csdn.net/xxxxxbt/article/details/107656385