java - 无法将类型 'java.lang.String' 的属性值转换为属性 'java.util.Date' : it is not exactly10characters long 所需的类型 'date'

Question

在我的代码中，我有两个实体 BusDetails 和 User。 User 和 BusDetails 具有多对多的关系。每当我尝试预订巴士时，数据都会保存在数据库的联接表中，但我收到此异常:
无法将类型“java.lang.String”的属性值转换为所需类型“java.lang.String”。 util.Date' 属性“日期”；嵌套异常是 java.lang.IllegalArgumentException: 无法解析日期: 它不完全是 10 个字符长]]

用户表:

public class User {


    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private int u_id;

    @Column
    @NotEmpty(message = "Name cannot be empty")
    private String name;

    @Column
    @NotEmpty(message = "Username cannot be empty")
    private String userName;

    @Column
    @NotEmpty(message = "please enter number")
    @Size(min = 10,max = 10, message = "10 digits required")
    private String number;

    @Column
    @NotEmpty
    @Size(min=8,message = "Minimum 8 characters required")
    private String password;

    @ManyToMany(cascade = CascadeType.MERGE,fetch = FetchType.EAGER)
    @JoinTable(name = "user_role",joinColumns = @JoinColumn(name = "u_id"), inverseJoinColumns = @JoinColumn(name = "r_id"))
    public Set<Role> roles;


    @ManyToMany(cascade = CascadeType.PERSIST,fetch = FetchType.EAGER)
    @JoinTable(name = "user_busdetails", joinColumns = @JoinColumn(name = "u_id") , inverseJoinColumns = @JoinColumn(name = "bus_Id"))
    public Set<BusDetails> bus = new HashSet<BusDetails>();


    //gettersAndSetters

巴士详情:

@Entity
@Component("BusDetails")
public class BusDetails {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private int bus_Id;


    @Column
    public String fromDestination;

    @Column
    public String toDestination;

    @Column
    @DateTimeFormat
    @Temporal(TemporalType.DATE)
    private Date date;

    @Column
    private String travels;

    @Column
    private String bus_Type;

    @Column
    private String seats_Available;

    @Column
    public String fare;

    @Column
    private String departure;

    @ManyToMany(fetch = FetchType.EAGER,mappedBy = "bus")
    @JsonIgnore
    public Set<User> user = new HashSet<User>();

    //gettersAndSetters

图书 Controller :

@PostMapping("/bookbus")
    @ResponseBody
    public BusDetails bookBus(@ModelAttribute BusDetails bus) {



        System.out.println(bus.getDate());
        return busDetail.bookBus(bus);

    }
    @InitBinder     
    public void initBinder(WebDataBinder binder){
         binder.registerCustomEditor(       Date.class,new CustomDateEditor(new SimpleDateFormat("yyyy- 
    MM-dd"), true, 10));   
    }

图书服务:

public BusDetails bookBus(BusDetails bus) {


        Authentication authentication = SecurityContextHolder.getContext().getAuthentication();

        String currentPrincipleName = authentication.getName();



        User user = userRepo.findByUserName(currentPrincipleName);


        user.getBus().add(bus);
        System.out.println(user);
        System.out.println(bus);


        userRepo.save(user);



        return bus;


    }

Answer 1

因为您在 Controller 中使用了@ModelAttribute，意味着所有参数都以字符串格式传递。

在您的情况下，是将String格式化为Date。

@Entity
@Component("BusDetails")
public class BusDetails {

    //...

    @Column
    private Date date;

    //setter(can add or modify) should be custom like below :
    public void setDate(String date){
        try {
            this.date = new SimpleDateFormat("yyyy-MM-dd").parse(date);
        } catch (ParseException e) {
            e.printStackTrace();
        }
    }

    // ...getter & setter
}