我很难在Spring MVC应用程序中使用表单支持bean和该表单支持bean中的复杂对象来显示验证错误。
似乎“hasErrors”功能不支持“。”字符或无法解析复杂对象?
加载以下代码时,我可以显示表单。但是,在验证器找到空作者姓名并重新加载create.html页面后,我得到一个关于Thymeleaf / Spring如何无法评估我的SPel表达式的堆栈跟踪。
当表达式声明“author.name”时,是否有人知道为什么要尝试加载“ author.author ”?这就好像该物业正在获得“作者”。在表达之前。
更新 经过大量的故障排除后,我发现验证器是问题,虽然我不知道为什么。
我已经包含了验证器。
AuthorCommandObject.java
public class AuthorCommandObject {
private Author _author;
private Book _book;
public Author getAuthor() {
return _author;
}
public void setAuthor(Author author) {
_author = author;
}
public Author getBook() {
return _book;
}
public void setBook(Book book) {
_book = book;
}
}
Author.java
public class Author {
private long _authorId;
private String _name;
public long getAuthorId() {
return _authorId;
}
public void setAuthorId(long authorId) {
_authorId = authorId;
}
public String getName() {
return _name;
}
public void setName(String name) {
_name = name;
}
}
Book.java
public class Book {
private long _bookId;
private String _bookName;
public long getBookId() {
return _bookId;
}
public void setBookId(long bookId) {
_bookId = bookId;
}
public String getName() {
return _name;
}
public void setName(String name) {
_name = name;
}
}
AuthorFormController.java
@Controller
@RequestMapping("/author")
public class AuthorFormController {
@InitBinder("authorCommandObject")
public void initBinder(WebDataBinder binder) {
binder.setValidator(new AutherCommandObjectValidator(new AuthorValidator(), new BookValidator()));
}
@RequestMapping(method=RequestMethod.GET, value ="/create", produces = "text/html")
public String createForm(Model model) {
AuthorCommandObject authorCommandObject = new AuthorCommandObject();
authorCommandObject.setAuthor(new Author());
authorCommandObject.setBook(new Book());
model.addAttribute("authorCommandObject", authorCommandObject);
return "/author/create";
}
@RequestMapping(method=RequestMethod.POST, value ="/save", produces = "text/html")
public String save(@Valid @ModelAttribute("authorCommandObject") AuthorCommandObject authorCommandObject, BindingResult result, Model model) {
if (result.hasErrors()) {
return "/author/create";
}
// the rest of the logic here
}
}
create.html上
<form th:action="@{/author/save}" method="POST" class="form-horizontal" th:object="${authorCommandObject}">
Author Name:<input type="text" th:field="*{author.name}" />
<ul th:if="${#fields.hasErrors('author.name')}">
<li th:each="err : ${#fields.errors('author.name')}" th:text="${err}" />
</ul>
<input type="submit" value="Submit" class="btn btn-primary btn-lg" />
</form>
AuthorCommandObjectValidator.java
public class AuthorCommandObjectValidator implements Validator {
private final Validator _authorValidator;
private final Validator _bookValidator;
public AuthorCommandObjectValidator(Validator authorValidator, Validator bookValidator) {
_authorValidator = authorValidator;
_bookValidator = bookValidator;
}
@Override
public boolean supports(Class<?> clazz) {
return AuthorCommandObject.class.equals(clazz);
}
@Override
public void validate(Object obj, Errors errors) {
AuthorCommandObject authorCommandObject = (AuthorCommandObject)obj;
try {
errors.pushNestedPath("author");
ValidationUtils.invokeValidator(_authorValidator, authorCommandObject.getAuthor(), errors);
errors.pushNestedPath("book");
ValidationUtils.invokeValidator(_bookValidator, authorCommandObject.getBook(), errors);
} finally {
errors.popNestedPath();
}
}
}
AuthorValidator.java
public class AuthorValidator implements Validator {
@Override
public boolean supports(Class<?> clazz) {
return Author.class.equals(clazz);
}
@Override
public void validate(Object obj, Errors errors) {
ValidationUtils.rejectIfEmptyOrWhitespace(errors, "name", "field.required");
}
}
部分Stacktrace(最后一行是最有帮助的)
org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.thymeleaf.exceptions.TemplateProcessingException: Exception evaluating SpringEL expression: "#fields.hasErrors('author.name')"
org.thymeleaf.exceptions.TemplateProcessingException: Exception evaluating SpringEL expression: "#fields.hasErrors('author.name')"
org.springframework.beans.NotReadablePropertyException: Invalid property 'author.author' of bean class [com.sample.application.AuthorCommandObject]: Bean property 'author.author' is not readable or has an invalid getter method: Does the return type of the getter match the parameter type of the setter?
答案 0 :(得分:0)
您之前需要这种标签:
<div th:object="${form}" th:remove="tag">
<ul>
<li th:each="err : ${#fields.errors('*')}" th:text="${err}" />
</ul>
</div>