【个人博客系统】后端管理功能开发

2021/8/5 23:37:34

编程Tag： 开发 string 功能 return id admin 博客 Blog public

本文主要是介绍【个人博客系统】后端管理功能开发，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

文章目录

  • 1.功能规划
  • 5.后台管理功能实现
    • 5.1后台登录
      • 1.构建登录页面和后台管理页面
      • 2.Service，Dao
      • 3.Controller
      • 4.MD5加密
      • 5.登录拦截器
    • 5.2分类管理
      • 1. 构建分类列表和编辑页面
      • 2.Service和Dao
      • 3.Controller
    • 5.3标签管理
      • 1.构建标签列表和编辑页面
      • 2.Service和Dao
      • 3.Controller
    • 5.4博客管理
      • 1.构建博客列表和编辑页面
      • 2.Service和Dao
      • 3.Controller

1.功能规划

image-20210805110427227

5.后台管理功能实现

5.1后台登录

实现后台管理员的登入功能

1.构建登录页面和后台管理页面

image-20210628144307859 image-20210628172108008

2.Service，Dao

UserRepository

public interface UserRepository extends JpaRepository<User, Long> {
    User findByUsernameAndPassword(String username, String password);
}

UserService

public interface UserService {
    User checkUser(String username, String password);
}

UserServiceImpl

@Service
public class UserServiceImpl implements UserService{

    @Autowired
    private UserRepository userRepository;

    @Override
    public User checkUser(String username, String password) {
        User user = userRepository.findByUsernameAndPassword(username, password);
        return user;
    }
}

3.Controller

将user放入session需要将重要信息消除，以防被截取，例如第18行中将密码消除再放入session中

LoginController

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

    @Autowired
    private UserService userService;

    @GetMapping
    public String loginPage() {
        return "admin/login";
    }

    @PostMapping("/login")
    public String login(@RequestParam String username, @RequestParam String password,
                        HttpSession session, RedirectAttributes redirectAttributes) {
        User user = userService.checkUser(username, password);
        if(user != null) {
            user.setPassword(null);
            session.setAttribute("user", user);
            return "admin/index";
        }
        redirectAttributes.addFlashAttribute("message", "用户名或密码错误");
        return "redirect:/admin";
    }

    @GetMapping("/logout")
    public String logout(HttpSession session) {
        session.removeAttribute("user");
        return "redirect:/admin";
    }
}

4.MD5加密

防止有人撞库获取我们管理员的用户密码，我们采取MD5对我们的密码进行加密后存入数据库中

MD5Util

public class MD5Util {
    public static String code(String str){
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            md.update(str.getBytes());
            byte[] byteDigest = md.digest();
            int i;
            StringBuffer buf = new StringBuffer("");
            for (int offset = 0; offset < byteDigest.length; offset++){
                i = byteDigest[offset];
                if (i<0)
                    i += 256;
                if (i<16)
                    buf.append("0");
                buf.append(Integer.toHexString(i));
            }
            //32位加密
            return buf.toString();
            //64位加密
            //return buf.toString().substring(8,24);
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
            return null;
        }
    }
}

@Service
public class UserServiceImpl implements UserService{

    @Autowired
    private UserRepository userRepository;

    @Override
    public User checkUser(String username, String password) {
        User user = userRepository.findByUsernameAndPassword(username, MD5Util.code(password));
        return user;
    }
}

5.登录拦截器

如果有用户获取了我们的管理员管理界面路径，即使未登录时也可以使用对应的路径名访问我们的管理员界面，显然是不安全的。所以我们要使用登录拦截器来防止这种情况发生，当用户未登录时，访问我们的管理员管理界面都会被重定向到管理员登录界面。

LoginInterceptor

public class LoginInterceptor extends HandlerInterceptorAdapter {
    @Override
    public boolean preHandle(HttpServletRequest request,
                             HttpServletResponse response,
                             Object handler) throws Exception {
        if (request.getSession().getAttribute("user") == null){
            response.sendRedirect("/admin");
            return false;
        }
        return true;
    }
}

WebConfig

@Configuration
public class WebConfig implements WebMvcConfigurer {
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new LoginInterceptor())
                .addPathPatterns("/admin/**")
                .excludePathPatterns("/admin")
                .excludePathPatterns("/admin/login");

    }
}

5.2分类管理

1. 构建分类列表和编辑页面

image-20210804193117067

image-20210804190336478

2.Service和Dao

TypeService

public interface TypeService {
    Type saveType(Type type);

    Type getType(Long id);

    Page<Type> listType(Pageable pageable);

    Type updateType(Long id, Type type);

    void deleteType(Long id);

    Type getTypeByName(String name);
}

TypeServiceImpl

@Service
public class TypeServiceImpl implements TypeService{

    @Autowired
    private TypeRepository typeRepository;

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

    @Transactional
    @Override
    public Type getType(Long id) {
        return typeRepository.getOne(id);
    }

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

    @Transactional
    @Override
    public Type updateType(Long id, Type type) {
        Type t = typeRepository.getOne(id);
        if(t == null) throw new NotFoundException("不存在该类型");
        BeanUtils.copyProperties(type, t);
        return typeRepository.save(t);
    }

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

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

TypeRepository

public interface TypeRepository extends JpaRepository<Type, Long> {

    Type findByName(String name);
}

3.Controller

TypeController

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

    @Autowired
    private TypeService typeService;

    @GetMapping("/types")
    public String list(@PageableDefault(size = 10, sort = {"id"}, direction = Sort.Direction.DESC)
                                   Pageable pageable, Model model) {
        model.addAttribute("page", typeService.listType(pageable));
        return "/admin/types";
    }

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

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

    @Transactional
    @PostMapping("/types")
    public String post(@Valid Type type, BindingResult result, RedirectAttributes attributes) {
        Type type1 = typeService.getTypeByName(type.getName());
        if(type1 != null) {
            result.rejectValue("name", "nameError", "该分类已存在");
        }
        if(result.hasErrors()) {
            return "/admin/types-input";
        }

        Type t = typeService.saveType(type);
        if (t == null){
            attributes.addFlashAttribute("message","新增失败");
        }else {
            attributes.addFlashAttribute("message","新增成功");
        }

        return "redirect:/admin/types";
    }

    @Transactional
    @PostMapping("/types/{id}")
    public String editPost(@Valid Type type, @PathVariable Long id,
                           BindingResult result, RedirectAttributes attributes) {
        Type type1 = typeService.getTypeByName(type.getName());
        if(type1 != null) {
            result.rejectValue("name", "nameError", "该分类已存在");
        }
        if(result.hasErrors()) {
            return "/admin/types-input";
        }

        Type t = typeService.updateType(id, type);
        if (t == null){
            attributes.addFlashAttribute("message","更新失败");
        }else {
            attributes.addFlashAttribute("message","更新成功");
        }

        return "redirect:/admin/types";
    }


    @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";
    }
}

5.3标签管理

1.构建标签列表和编辑页面

image-20210805105508929

image-20210805105633415

2.Service和Dao

TagRepository

public interface TagRepository extends JpaRepository<Tag, Long> {

    Tag findByName(String name);
}

TagService

public interface TagService {

    Tag saveTag(Tag tag);

    Tag getTag(Long id);

    Page<Tag> listTag(Pageable pageable);

    Tag updateTag(Long id, Tag tag);

    void deleteTag(Long id);

    Tag getTagByName(String name);
}

TagServiceImpl

@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);
    }

    @Transactional
    @Override
    public Tag getTagByName(String name) {
        return null;
    }
}

3.Controller

TagController

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

    @Autowired
    private TagService tagService;

    @GetMapping("/tags")
    public String tags(@PageableDefault(size = 10, 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 edit(@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", "该标签已存在");
        }
        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, @PathVariable Long id,
                           BindingResult result, RedirectAttributes attributes) {
        Tag tag1 = tagService.getTagByName(tag.getName());
        if (tag1 != null) {
            result.rejectValue("name", "nameError", "该标签已存在");
        }
        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";
    }

}

5.4博客管理

1.构建博客列表和编辑页面

image-20210805222804673

image-20210805223157124

2.Service和Dao

BlogService

public interface BlogService {

    Blog getBlog(Long id);

    Page<Blog> listBlog(Pageable pageable, BlogQuery blog);

    Blog saveBlog(Blog blog);

    Blog updateBlog(Long id, Blog blog);

    void deleteBlog(Long id);
}

因为博客查询功能中提供了按指定条件查询，所以需要实现模糊查询。

其实本质上就是对本身select全部博客的sql语句添加了where条件进行筛选结果。

  1. 在这里先要使Dao层的BlogRepository继承JpaSpecificationExecutor类

BlogRepository

public interface BlogRepository extends JpaRepository<Blog, Long>, JpaSpecificationExecutor<Blog> {

}
  1. 将查询的条件封装成类
public class BlogQuery {
    private String title;
    private Long TypeId;
    private boolean recommend;

    public BlogQuery() {
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public Long getTypeId() {
        return TypeId;
    }

    public void setTypeId(Long typeId) {
        TypeId = typeId;
    }

    public boolean isRecommend() {
        return recommend;
    }

    public void setRecommend(boolean recommend) {
        this.recommend = recommend;
    }
}
  1. BlogServiceImpl的listBlog方法实现如下
    @Override
    public Page<Blog> listBlog(Pageable pageable, BlogQuery blog) {
        return blogRepository.findAll(new Specification<Blog>() {
            @Override
            public Predicate toPredicate(Root<Blog> root, CriteriaQuery<?> cq, CriteriaBuilder cb) {
                List<Predicate> predicates = new ArrayList<>();
                if (blog.getTitle() != null && !"".equals(blog.getTitle())){
                    predicates.add(cb.like(root.<String>get("title"),"%"+blog.getTitle()+"%"));
                }
                if (blog.getTypeId() != null){
                    predicates.add(cb.equal(root.<Type>get("type").get("id"),blog.getTypeId()));
                }
                if (blog.isRecommend()){
                    predicates.add(cb.equal(root.<Boolean>get("recommend"),blog.isRecommend()));
                }
                cq.where(predicates.toArray(new Predicate[predicates.size()]));
                return null;
            }
        },pageable);
    }

BlogServiceImpl

@Service
public class BlogServiceImpl implements BlogService{

    @Autowired
    private BlogRepository blogRepository;


    @Override
    public Blog getBlog(Long id) {
        return blogRepository.getOne(id);
    }

    @Override
    public Page<Blog> listBlog(Pageable pageable, BlogQuery blog) {
        return blogRepository.findAll(new Specification<Blog>() {
            @Override
            public Predicate toPredicate(Root<Blog> root, CriteriaQuery<?> cq, CriteriaBuilder cb) {
                List<Predicate> predicates = new ArrayList<>();
                if (blog.getTitle() != null && !"".equals(blog.getTitle())){
                    predicates.add(cb.like(root.<String>get("title"),"%"+blog.getTitle()+"%"));
                }
                if (blog.getTypeId() != null){
                    predicates.add(cb.equal(root.<Type>get("type").get("id"),blog.getTypeId()));
                }
                if (blog.isRecommend()){
                    predicates.add(cb.equal(root.<Boolean>get("recommend"),blog.isRecommend()));
                }
                cq.where(predicates.toArray(new Predicate[predicates.size()]));
                return null;
            }
        },pageable);
    }

    @Transactional
    @Override
    public Blog saveBlog(Blog blog) {
        SimpleDateFormat ft = new SimpleDateFormat("yyyy-MM-dd hh:mm");
        if(blog.getId() == null) {
            blog.setCreateTime(new Date());
            blog.setViews(0);
        }
        blog.setUpdateTime(new Date());
        return blogRepository.save(blog);
    }

    @Transactional
    @Override
    public Blog updateBlog(Long id, Blog blog) {
        Blog t = blogRepository.getOne(id);
        if(t == null) throw new NotFoundException("该博客不存在");
        blog.setUpdateTime(new Date());
        BeanUtils.copyProperties(blog, t, MyBeanUtils.getNullPropertyNames(blog));
        return blogRepository.save(t);
    }

    @Transactional
    @Override
    public void deleteBlog(Long id) {
        blogRepository.deleteById(id);
    }
}

3.Controller

BlogController

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

    @Autowired
    private BlogService blogService;
    @Autowired
    private TypeService typeService;
    @Autowired
    private TagService tagService;

    @GetMapping("/blogs")
    public String list(@PageableDefault(size = 10, sort = {"updateTime"}, direction = Sort.Direction.DESC)
                                   Pageable pageable, BlogQuery blog, Model model) {
        model.addAttribute("types", typeService.listType());
        model.addAttribute("page", blogService.listBlog(pageable, blog));
        return "/admin/blogs";
    }

    @PostMapping("/blogs/search")
    public String search(@PageableDefault(size = 10, sort = {"updateTime"}, direction = Sort.Direction.DESC)
                                     Pageable pageable, BlogQuery blog, Model model) {
        model.addAttribute("page", blogService.listBlog(pageable, blog));
        return "/admin/blogs :: blogList";
    }

    @GetMapping("/blogs/input")
    public String input(Model model) {
        setTypeAndTag(model);
        model.addAttribute("blog", new Blog());
        return "/admin/blogs-input";
    }

    @GetMapping("/blogs/{id}/input")
    public String editInput(@PathVariable Long id, Model model) {
        setTypeAndTag(model);
        Blog blog = blogService.getBlog(id);
        blog.initTagIds();
        model.addAttribute("blog",blog);
        return "/admin/blogs-input";
    }

    private void setTypeAndTag(Model model) {
        model.addAttribute("types", typeService.listType());
        model.addAttribute("tags", tagService.listTag());
    }

    @PostMapping("/blogs")
    public String post(Blog blog, RedirectAttributes attributes, HttpSession session) {
        blog.setUser((User) session.getAttribute("user"));
        blog.setType(blog.getType());
        blog.setTags(tagService.listTag(blog.getTagIds()));
        Blog b;
        if(blog.getId() == null) {
            b = blogService.saveBlog(blog);
        }else {
            b = blogService.updateBlog(blog.getId(), blog);
        }
        if (b == null){
            attributes.addFlashAttribute("message","操作失败");
        }else {
            attributes.addFlashAttribute("message","操作成功");
        }
        return "redirect:/admin/blogs";
    }

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

}


这篇关于【个人博客系统】后端管理功能开发的文章就介绍到这儿，希望我们推荐的文章对大家有所帮助，也希望大家多多支持为之网！


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