spring boot实体设计+用户登录+类别分页展示

在po实体文件夹下新建User实体类

@Entity
@Table(name = “t_user”)
public class User {

@Id //主键标识
@GeneratedValue(strategy = GenerationType.IDENTITY)  //自增
private Long id;
private String nickname;
private String username;
private String password;
private String email;
private String avatar;
private Integer type;

@Temporal(TemporalType.TIMESTAMP) //指定时间戳
private Date createTime;
@Temporal(TemporalType.TIMESTAMP) //指定时间戳
private Date updateTime;

//一对多关系的新闻
@OneToMany(mappedBy = "user")
private List<News> newsList = new ArrayList<>();

public Long getId() {
return id;
}

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

public String getNickname() {
return nickname;
}

public void setNickname(String nickname) {
this.nickname = nickname;
}

public String getUsername() {
return username;
}

public void setUsername(String username) {
this.username = username;
}

public String getPassword() {
return password;
}

public void setPassword(String password) {
this.password = password;
}

public String getEmail() {
return email;
}

public void setEmail(String email) {
this.email = email;
}

public String getAvatar() {
return avatar;
}

public void setAvatar(String avatar) {
this.avatar = avatar;
}

public Integer getType() {
return type;
}

public void setType(Integer type) {
this.type = type;
}

public Date getCreateTime() {
return createTime;
}

public void setCreateTime(Date createTime) {
this.createTime = createTime;
}

public Date getUpdateTime() {
return updateTime;
}

public void setUpdateTime(Date updateTime) {
this.updateTime = updateTime;
}

public List<News> getNewsList() {
return newsList;
}

public void setNewsList(List<News> newsList) {
this.newsList = newsList;
}

@Override
public String toString() {
return "User{" +
"id=" + id +
", nickname='" + nickname + '\'' +
", username='" + username + '\'' +
", password='" + password + '\'' +
", email='" + email + '\'' +
", avatar='" + avatar + '\'' +
", type=" + type +
", createTime=" + createTime +
", updateTime=" + updateTime +
", newsList=" + newsList +
'}';
}}

新建dao接口

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

在Service目录下新建一个UserService接口

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

在Impl下新建一个UserServiceImpl

@Service
public class UserServiceImpl implements UserService {

@Autowired
private UserRepository userRepository;

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

新建controller

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

@Autowired
UserService userService;

//跳转到登陆界面

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

@PostMapping("/login")
public String login(@RequestParam String username , @RequestParam String password,
HttpSession session, RedirectAttributes attributes) {

User user = userService.checkUsers(username, password);

if (user != null) {
user.setPassword(null);
session.setAttribute("user", user);
return "admin/index";
} else {
attributes.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";
}
}

在po目录下新建一个Type实体类

@Entity
@Table(name = "t_type")
public class Type {

@Id
@GeneratedValue(strategy =  GenerationType.IDENTITY)  //自增
private Long id;
private String name;

@OneToMany(mappedBy = "type")
private List<News> news = new ArrayList<>();

public Type() {
}

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;
}

public List<News> getNews() {
return news;
}

public void setNews(List<News> news) {
this.news = news;
}

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

dao目录下新建一个TypeRepository接口

public interface TypeRepository extends JpaRepository<Type,Long> {
}

在service目录下新建一个TypeService接口

public interface TypeService {
Page<Type> listType(Pageable pageable);
}

在Impl中新建一个TypeServiceImpl

@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
}
}

新建一个TypeController

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

@Autowired
private TypeService typeService;

@RequestMapping("/types")
public String type(@PageableDefault(size = 3,sort = {"id"},direction = Sort.Direction.DESC)
Pageable pageable, Model model){
model.addAttribute("page",typeService.listType(pageable));
return "admin/types";
}
}

效果展示