实体在 Spring MVC 中使用 ModelMapper 执行 DTO

Question

我想就我是否很好地进行实体到 DTO 的转换提出建议。 就我而言，服务层的转换很困难。 “ Lorem ipum dolor sit amet，ConsectEtur adipiscising Elit，Z177544A797AF6F322F322F8CAA5E80E7F24Z do eiusmod eriiusmod eriusmod utius ut ut labore et dolore magna aliqua。 "

实体 class：

@Entity
@Table(name="authorities")
public class Authorities {
    
    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    @Column(name="id")
    private Integer id;
    
    @Column(name="username")
    private String username;
    
    @Column(name="authority")
    private String authority;
    
    @ManyToOne
    @JoinColumn(name="users_id")
    private Users users;
    
    @JsonFormat(timezone = "Europe/Warsaw")
    @CreationTimestamp
    @Temporal(TemporalType.TIMESTAMP)
    @Column(name="added_day",nullable = false, updatable = false)
    private Date addedDay;
    
    @JsonFormat(timezone = "Europe/Warsaw")
    @UpdateTimestamp
    @Temporal(TemporalType.TIMESTAMP)
    @Column(name = "last_modification")
    private Date  lastModification;
    
    @Column(name = "last_modifier")
    private String lastModifier;
    
    
    
    public Authorities() {
        
    }

    public Authorities(Integer id, String username, String authority, Users users, Date addedDay, Date lastModification,
            String lastModifier) {
        this.id = id;
        this.username = username;
        this.authority = authority;
        this.users = users;
        this.addedDay = addedDay;
        this.lastModification = lastModification;
        this.lastModifier = lastModifier;
    }

    public Integer getId() {
        return id;
    }

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

    public String getUsername() {
        return username;
    }

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

    public String getAuthority() {
        return authority;
    }

    public void setAuthority(String authority) {
        this.authority = authority;
    }

    public Users getUsers() {
        return users;
    }

    public void setUsers(Users users) {
        this.users = users;
    }

    public Date getAddedDay() {
        return addedDay;
    }

    public void setAddedDay(Date addedDay) {
        this.addedDay = addedDay;
    }

    public Date getLastModification() {
        return lastModification;
    }

    public void setLastModification(Date lastModification) {
        this.lastModification = lastModification;
    }

    public String getLastModifier() {
        return lastModifier;
    }

    public void setLastModifier(String lastModifier) {
        this.lastModifier = lastModifier;
    }

    @Override
    public String toString() {
        return "Authorities [id=" + id + ", username=" + username + ", authority=" + authority + ", users=" + users
                + ", addedDay=" + addedDay + ", lastModification=" + lastModification + ", lastModifier=" + lastModifier
                + "]";
    }

    

    

    
    
    

}

DTO class：

public class AuthoritiesDTO {
    
    private Integer id;
    
    private String username;
    
    private String authority;
    
    private Users users;
    
    private String addedDay;
    
    private String  lastModification;
    
    private String lastModifier;
    
    public AuthoritiesDTO() 
    {
        
    }

    public AuthoritiesDTO(Integer id, String username, String authority, Users users, String addedDay,
            String lastModification, String lastModifier) {
        this.id = id;
        this.username = username;
        this.authority = authority;
        this.users = users;
        this.addedDay = addedDay;
        this.lastModification = lastModification;
        this.lastModifier = lastModifier;
    }

    public void setUsers(Users users) {
        this.users = users;
    }

    public Integer getId() {
        return id;
    }

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

    public String getUsername() {
        return username;
    }

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

    public String getAuthority() {
        return authority;
    }

    public void setAuthority(String authority) {
        this.authority = authority;
    }

    public String getAddedDay() {
        return addedDay;
    }

    public void setAddedDay(String addedDay) {
        this.addedDay = addedDay;
    }

    public String getLastModification() {
        return lastModification;
    }

    public void setLastModification(String lastModification) {
        this.lastModification = lastModification;
    }

    public Users getUsers() {
        return users;
    }

    public String getLastModifier() {
        return lastModifier;
    }

    public void setLastModifier(String lastModifier) {
        this.lastModifier = lastModifier;
    }

    @Override
    public String toString() {
        return "AuthoritiesDTO [id=" + id + ", username=" + username + ", authority=" + authority + ", users=" + users
                + ", addedDay=" + addedDay + ", lastModification=" + lastModification + ", lastModifier=" + lastModifier
                + "]";
    }

}

道 class：

@Repository
@ComponentScan(basePackages = {"cms.app.entity"})
public class AuthoritiesDAOImpl  extends CommonClass implements AuthoritiesDAO{

    @Autowired
    private EntityManager entityManager;
        
    @Override
    public List<Authorities> getAuthorities() {
        
        Session currentSession = entityManager.unwrap(Session.class);
        
        String username=getPrincipal();
        
        Query<Authorities> theQuery = 
                currentSession.createQuery("from Authorities",
                        Authorities.class);
        
        List<Authorities> authorities = theQuery.getResultList();
            
        //logger.info("Query getAuthorities() in table Authorities in day: "+dateTimeFormatter.format(LocalDateTime.now())+" by: "+username);
        
        return authorities;
    }

    @Override
    public void saveAuthorities(Authorities theAuthorities) {

        Session currentSession = entityManager.unwrap(Session.class);
        
        String username=getPrincipal();
        
        theAuthorities.setLastModifier(username);
        
        //logger.info("Record saved in table Authorities in day: "+dateTimeFormatter.format(LocalDateTime.now())+", data: "+theAuthorities.toString()+" by: "+username);
        
        currentSession.saveOrUpdate(theAuthorities);
        
    }

    @Override
    public Authorities getAuthorities(int theId) {

        Session currentSession = entityManager.unwrap(Session.class);
        
        String username=getPrincipal();
        
        Authorities theAuthorities = currentSession.get(Authorities.class, theId);
        
        logger.info("Query getAuthorities(int theId) in table Authorities in day: "+dateTimeFormatter.format(LocalDateTime.now())+"with ID: "+theId+" by: "+username);
        
        return theAuthorities;
    }

    @Override
    public void deleteAuthorities(int theId) {

        Session currentSession = entityManager.unwrap(Session.class);
        
        String username=getPrincipal();
        
        Query theQuery = 
                currentSession.createQuery("delete from Authorities where id=:authoritiesId");
        theQuery.setParameter("authoritiesId", theId);
        
        logger.info("Record deleted in table Authorities in day: "+dateTimeFormatter.format(LocalDateTime.now())+", with ID: "+theId+" by: "+username);
        
        theQuery.executeUpdate();       
    }
    
    @Override
    public List<String> getRoleDropDownList()
    {
        Session currentSession = entityManager.unwrap(Session.class);

        Query<String> theQuery = currentSession.createQuery("SELECT roleName FROM Role");
        
        List<String> role = theQuery.getResultList();
                
        return role;
    }
}

服务 class：

@Service
@ComponentScan(basePackages = {"cms.app.dao"})
public class AuthoritiesServiceImpl implements AuthoritiesService {

    @Autowired
    public AuthoritiesDAOImpl authoritiesDAOImpl;
    
    @Override
    @Transactional
    public List<Authorities> getAuthorities() {
        
        return authoritiesDAOImpl.getAuthorities();
    }

    @Override
    @Transactional
    public void saveAuthorities(Authorities theAuthorities) {
        
        authoritiesDAOImpl.saveAuthorities(theAuthorities);

    }

    @Override
    @Transactional
    public Authorities getAuthorities(int theId) {
        
        return authoritiesDAOImpl.getAuthorities(theId);
    }

    @Override
    @Transactional
    public void deleteAuthorities(int theId) {
        
        authoritiesDAOImpl.deleteAuthorities(theId);
    }

    

}

Controller class：

@Controller
@RequestMapping("/authorities")
public class AuthoritiesController {

    
    @Autowired
    private AuthoritiesService authoritiesService;
    
    @Autowired
    private ModelMapper modelMapper;
    
    private AuthoritiesDTO convertToDTO(Authorities authorities)
    {
        AuthoritiesDTO authoritiesDTO = modelMapper.map(authorities, AuthoritiesDTO.class);
        return authoritiesDTO;
    }
    
    private Authorities convertToEntity(AuthoritiesDTO authoritiesDTO) throws ParseException
    {
        Authorities authorities = modelMapper.map(authoritiesDTO, Authorities.class);
        
        if(authoritiesDTO.getId() != null)
        {
            Authorities oldAuthorities = authoritiesService.getAuthorities(authoritiesDTO.getId());
        }
        
        return authorities;
    }
    
    @GetMapping("/list")
    public String listAuthorities(Model theModel) {
        

        List<Authorities> theAuthorities = authoritiesService.getAuthorities();
        
        theAuthorities.stream().map(this::convertToDTO).collect(Collectors.toList());
        
        theModel.addAttribute("authorities", theAuthorities);
        
        return "/list/list-authorities";
    }
    
    @GetMapping("/showFormForAdd")
    public String showFormForAdd(Model theModel) {
        
        Authorities theAuthorities = new Authorities();
        
        theModel.addAttribute("authorities", theAuthorities);
        
        return "/form/authorities-form";
    }
    
    @PostMapping("/saveAuthorities")
    public String saveAuthorities(@ModelAttribute("authorities") Authorities theAuthorities)
    {   
        authoritiesService.saveAuthorities(theAuthorities);
        
        return "redirect:/authorities/list";
    }
    
    @GetMapping("/showFormForUpdate")
    public String showFormForUpdate(@RequestParam("authoritiesId") int theId,
                                    Model theModel) {
        
        AuthoritiesDTO theAuthorities = convertToDTO(authoritiesService.getAuthorities(theId));
        
        theModel.addAttribute("authorities", theAuthorities);
            
        return "/form/authorities-form";
    }
    
    @GetMapping("/delete")
    public String deleteAuthorities(@RequestParam("authoritiesId") int theId) {
        
        authoritiesService.deleteAuthorities(theId);
        
        return "redirect:/authorities/list";
    }
}