Question

当我运行它时会创建一本新书如果有效，但是如果出错，它将不会回发到页面而我得到400：

This application has no explicit mapping for /error, so you are seeing this as   a fallback.
There was an unexpected error (type=Bad Request, status=400).
Validation failed for object='book'. Error count: 4

我测试了系统输出，如果它有错误它永远不会到达提交，我想也许@Valid是错误的或??? 这是我的控制员...请告诉我缺少什么？

@Controller
@RequestMapping("/")
public class BookController{

@RequestMapping(method=RequestMethod.GET)
public String home(Model model) {

    refData = new ReferenceData();
    model.addAttribute("refData", refData);

    model.addAttribute("book", new Book());

    List<Book> books = BookRepo.findAll();
    model.addAttribute("books", books);

    return "home";
}   

@RequestMapping(method=RequestMethod.POST)
public String submit(@Valid Book book,Model model, BindingResult bindingResult) {

    refData = new ReferenceData();
    model.addAttribute("refData", refData);

    if (bindingResult.hasErrors()) {
        return "home";
    }

    BookRepo.save(book);
    return "redirect:/";
}

我的表单看起来像这样......

<form name="addForm" action="#" th:action="@{/}" th:object="${book}" method="post">
    <table>
        <tr>
            <td><label for="*{title}">Book:</label></td>
            <td><input type="text" th:field="*{title}" /></td>
            <td th:if="${#fields.hasErrors('title')}" th:errors="*{title}">Name
                Error</td>
        </tr>
        <tr>
            <td><label for="*{author}">Author:</label></td>
            <td><input type="text" th:field="*{author}" /></td>
            <td th:if="${#fields.hasErrors('author')}" th:errors="*{author}">Author
                Error</td>
        </tr>
        <tr>
            <td><label for="*{genre}">Genre:</label></td>
            <td><input type="text" th:field="*{genre}" /></td>
            <td th:if="${#fields.hasErrors('genre')}" th:errors="*{genre}">genre
                Error</td>
        </tr>
        <tr>
            <td><label for="*{pages}">Pages:</label></td>
            <td><input type="text" th:field="*{pages}" /></td>
            <td th:if="${#fields.hasErrors('pages')}" th:errors="*{pages}">pages
                Error</td>
        </tr>



        <tr>
            <td><label th:for="*{year}">Year:</label></td>
            <td>
            <select th:field="*{year}" ng-model="bookData.year">
                <option th:each="selectItem: ${refData.years}"
                    th:value="${selectItem.value}" th:text="${selectItem.label}">year</option>
            </select>
            </td>
            <td th:if="${#fields.hasErrors('year')}" th:errors="*{year}">year
                Error</td>
        </tr>
        <tr>
            <td><label th:for="*{rating}">Rating:</label></td>
            <td><select th:field="*{rating}" ng-model="bookData.rating">
                    <option th:each="selectItem: ${refData.rating}"
                        th:value="${selectItem.value}" th:text="${selectItem.label}">rating</option>
            </select></td>
            <td th:if="${#fields.hasErrors('rating')}" th:errors="*{rating}">rating
                Error</td>
        </tr>
        <tr>
            <td><button type="submit">Submit</button></td>
        </tr>
    </table>

</form>

我的实体......

@Entity
public final class Book
{

@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Integer id;

@NotNull
@Pattern(regexp="^[a-zA-Z0-9_]+$")
private String title;

@NotNull
@Pattern(regexp="^[a-zA-Z0-9_]+$")
private String author;

@NotNull
@Pattern(regexp="^[a-zA-Z0-9_]+$")
private String genre;


@NotNull
@Digits(message="message here", integer=32767, fraction = 0)
private Integer pages;

private String year;
private String rating;

Answer 1

我发现我必须将bindingResult直接放在@Valid Book实体之后......

@RequestMapping(method=RequestMethod.POST)
public String submit(@Valid Book book,**BindingResult bindingResult**, Model model ) {


    refData = new ReferenceData();
    model.addAttribute("refData", refData);

    if (bindingResult.hasErrors()) {
        return "home";
    }


    BookRepo.save(book);
    return "redirect:/";
}

哇，这是一个未成年人=重大错误!!

Johnny O。

如何在Thymeleaf中使用javax.validation

1 个答案: