Formular gibt 400 Bad Request Fehler bei der Verwendung mit Spring ModelAttribute

Question

Ich habe HTML-Formular, das ich an Feder-Controller weiterleiten. Es funktioniert gut, wenn ich getParameter benutze, aber mit modelAttribute heißt es 400 fehlerhafte Anfrage Fehler.

Hier ist mein Controller-Code

@Controller 
public class BookController { 



    @RequestMapping (value="/addBook") 
    public String addBook(@ModelAttribute Book book){ 

     System.out.println(book.getBookName()); 
     bookService.addBooks(book); 


     return "index"; 
    } 


} 

Dies ist Buch-Modell-Code

@Entity 
@Table (name = "Book") 
public class Book { 

     @Id 
     @GeneratedValue(strategy = GenerationType.IDENTITY) 
     @Column(name="ID",columnDefinition = "BIGINT NOT NULL AUTO_INCREMENT") 
     private long bookId; 
     @Column(name="book_code",columnDefinition = "VARCHAR(200) NOT NULL") 
     private String bookCode; 
     private String bookName; 
     private String author; 
     @Temporal (TemporalType.DATE) 
     private Date dateOfArrival; 
     private Double price; 
     private String rackNo; 
     private int numberOfBook; 
     private String subjectCode; 

     public Book() { 
      super(); 
     } 

     public Book(String bookCode, String bookName, String author, 
       Date dateOfArrival, Double price, String rackNo, 
       int numberOfBook, String subjectCode) { 
      super(); 
      this.bookCode = bookCode; 
      this.bookName = bookName; 
      this.author = author; 
      this.dateOfArrival = dateOfArrival; 
      this.price = price; 
      this.rackNo = rackNo; 
      this.numberOfBook = numberOfBook; 
      this.subjectCode = subjectCode; 
     } 



     public String getBookCode() { 
      return bookCode; 
     } 



     public long getBookId() { 
      return bookId; 
     } 

     public void setBookId(long bookId) { 
      this.bookId = bookId; 
     } 

     public void setBookCode(String bookCode) { 
      this.bookCode = bookCode; 
     } 

     public String getBookName() { 
      return bookName; 
     } 

     public void setBookName(String bookName) { 
      this.bookName = bookName; 
     } 

     public String getAuthor() { 
      return author; 
     } 

     public void setAuthor(String author) { 
      this.author = author; 
     } 

     public Date getDateOfArrival() { 
      return dateOfArrival; 
     } 

     public void setDateOfArrival(Date dateOfArrival) { 
      this.dateOfArrival = dateOfArrival; 
     } 

     public Double getPrice() { 
      return price; 
     } 

     public void setPrice(Double price) { 
      this.price = price; 
     } 

     public String getRackNo() { 
      return rackNo; 
     } 

     public void setRackNo(String rackNo) { 
      this.rackNo = rackNo; 
     } 

     public int getNumberOfBook() { 
      return numberOfBook; 
     } 

     public void setNumberOfBook(int numberOfBook) { 
      this.numberOfBook = numberOfBook; 
     } 

     public String getSubjectCode() { 
      return subjectCode; 
     } 

     public void setSubjectCode(String subjectCode) { 
      this.subjectCode = subjectCode; 
     } 

} 

Ich habe Zweifel, dass das Problem mit Datum fällig ist Bitte hilf mir

Answer 1

Ich würde 2 Dinge versuchen.

1. in Ihrem Modell fügen Sie diese:

   //here use the same pattern of date your send from the view 
   @DateTimeFormat(pattern = "dd/MM/yyyy") 
   private Date dateOfArrival; 
   

2. In Ihrem Controller

   @RequestMapping (value="/addBook") 
   public String addBook(@ModelAttribute Book book, BindingResult result){ 
   ... 
   

Dann können Sie Ihre Methode zum Debuggen und das Problem kennen.