Spring JPA Auditing empty createdBy

Question

我正在使用Spring Data的审计功能,并且有一个类似于这样的类:

@Entity
@Audited
@EntityListeners(AuditingEntityListener.class)
@Table(name="Student")
public class Student {
    @Id
    @GeneratedValue (strategy = GenerationType.AUTO)
    private Long id;

    @CreatedBy
    private String createdBy;

    @CreatedDate
    private Date createdDate;

    @LastModifiedBy
    private String lastModifiedBy;

    @LastModifiedDate
    private Date lastModifiedDate;
...

现在,我相信我已经配置了审计,因为我可以看到在更新域对象时createdBy,createdDate,lastModifiedBy和lastModifiedDate都获得了正确的值.

但是,我的问题是,当我更新对象时,我将丢失createdBy和createdDate的值.所以,当我第一次创建对象时,我有四个值,但是当我更新它时,createdBy和createdDate都无效!我还使用Hibernate envers来保存域对象的历史记录.

你知道为什么我会这样做吗？当我更新域对象时,为什么createdBy和createdDate为空？

更新:回答@m-deinum的问题:是的,春天数据JPA配置正确 - 其他一切正常 - 我真的不想发布配置,因为你的udnerstand它需要很大的空间.

我的AuditorAwareImpl是这样的

@Component
public class AuditorAwareImpl implements AuditorAware {
    Logger logger = Logger.getLogger(AuditorAwareImpl.class);

    @Autowired
    ProfileService profileService;

    @Override
    public String getCurrentAuditor() {
        return profileService.getMyUsername();
    }
}

最后,这是我的更新控制器实现:

    @Autowired  
    private StudentFormValidator validator;
    @Autowired
    private StudentRepository studentRep;

@RequestMapping(value="/edit/{id}", method=RequestMethod.POST)  
public String updateFromForm(
         @PathVariable("id")Long id,
         @Valid Student student, BindingResult result,
         final RedirectAttributes redirectAttributes)   {  

     Student s =  studentRep.secureFind(id); 
     if(student == null || s == null) {
         throw new ResourceNotFoundException();
     }
     validator.validate(student, result);
     if (result.hasErrors()) {  
         return "students/form";
     } 
     student.setId(id);
     student.setSchool(profileService.getMySchool());
     redirectAttributes.addFlashAttribute("message", "???????? ????????!");
     studentRep.save(student);
     return "redirect:/students/list";  
}  

更新2:请看一个更新的版本

@RequestMapping(value="/edit/{id}", method=RequestMethod.GET)  
     public ModelAndView editForm(@PathVariable("id")Long id)  {  
         ModelAndView mav = new ModelAndView("students/form");  
         Student student =  studentRep.secureFind(id); 
         if(student == null) {
             throw new ResourceNotFoundException();
         }
         mav.getModelMap().addAttribute(student);
         mav.getModelMap().addAttribute("genders", GenderEnum.values());
         mav.getModelMap().addAttribute("studentTypes", StudEnum.values());
         return mav;  
     }  

     @RequestMapping(value="/edit/{id}", method=RequestMethod.POST)  
     public String updateFromForm(
             @PathVariable("id")Long id,
             @Valid @ModelAttribute Student student, BindingResult result,
             final RedirectAttributes redirectAttributes, SessionStatus status)   {  

         Student s =  studentRep.secureFind(id); 
         if(student == null || s == null) {
             throw new ResourceNotFoundException();
         }

         if (result.hasErrors()) {  
             return "students/form";
         } 
         //student.setId(id);
         student.setSchool(profileService.getMySchool());
         studentRep.save(student);
         redirectAttributes.addFlashAttribute("message", "???????? ????????!");
         status.setComplete();
         return "redirect:/students/list";  
     }  

当我做更新时,这仍然会使createdBy和createdDate字段变空:(

此外,它没有得到学校的价值(由于它与当前正在编辑的用户有关,因此不包含在我的表格中)所以我需要从SecurityContext再次获取它...我做错了什么？

更新3:供参考,不要在评论中遗漏:主要问题是我需要将@SessionAttributes注释包含在我的控制器中.

Answer 1

使用@Column注释的可更新属性,如下所示.

@Column(name = "created_date", updatable = false)
private Date createdDate;

这将在更新操作中保留创建日期.

Answer 2

(@)Controller 类中的方法效率不高。您不想（手动）检索对象并将所有字段、关系等复制到其中。其次，对于复杂的对象，您迟早会遇到大麻烦。

您想要的是在第一个方法（用于显示表单的 GET）中检索用户并将其存储在会话中，使用@SessionAttributes. 接下来，您需要一个@InitBinder带注释的方法来设置验证器，WebDataBinder以便 spring 进行验证。这将使您的updateFromForm方法变得干净整洁。

@Controller
@RequestMapping("/edit/{id}")
@SessionAttributes("student")
public EditStudentController

    @Autowired  
    private StudentFormValidator validator;

    @Autowired
    private StudentRepository studentRep;

    @InitBinder
    public void initBinder(WebDataBinder binder) {
        binder.setValidator(validator);
    }

    @RequestMapping(method=RequestMethod.GET)
    public String showUpdateForm(Model model) {
        model.addObject("student", studentRep.secureFind(id));
        return "students/form";
    }

    @RequestMapping(method=RequestMethod.POST)
    public String public String updateFromForm(@Valid @ModelAttribute Student student, BindingResult result, RedirectAttributes redirectAttributes, SessionStatus status)   {  
        // Optionally you could check the ids if they are the same.
        if (result.hasErrors()) {  
            return "students/form";
        } 
        redirectAttributes.addFlashAttribute("message", "?p?t???? p??s????!");
        studentRep.save(student);
        status.setComplete(); // Will remove the student from the session
        return "redirect:/students/list";  
    }
}  

您需要将SessionStatus属性添加到方法中并将处理标记为完成，以便 Spring 可以从会话中清理您的模型。

这样你就不必复制对象等，Spring 将完成所有的工作，并且所有字段/关系都将被正确设置。