我使用的是Spring MVC和Thymeleaf,我读过这些东西: https://spring.io/blog/2013/11/01/exception-handling-in-spring-mvc https://spring.io/guides/gs/validating-form-input/
1 - 我还不知道如何在没有@Valid
注释的情况下验证表单,比如在这种情况下如何进行验证(没有形式匹配的bean)
@RequestMapping(value = "/signup", method = RequestMethod.POST)
public String registrationSubmit(@RequestParam(required = false) String phone,
@RequestParam(required = false) String passwd,
@RequestParam(required = false) String passwdRepeat,
@RequestParam(required = false) String smsCode, BindingResult bindingResult) {
//validation
if (phone.isEmpty()) {
FieldError fieldError = new FieldError("phone","phone","phone error");
bindingResult.addError(fieldError);
bindingResult.rejectValue("phone", "error.user", "phone error");
return "register_form";
}
return "";
}
2 - 以及如何处理UserNotFoundException
之类的例外情况并注意表单中的用户,而不是使用新视图进行回复。
答案 0 :(得分:1)
如果出现错误则抛出异常,然后使用@ExceptionHandler注释另一个方法,该方法将处理异常并呈现相应的响应。
答案 1 :(得分:1)
试试这个...... 我致力于更好的解决方案
@RequestMapping(method = POST)
@ResponseBody
public FooDto create(@Valid FooDTO fooDto, BindingResult bindingResult) {
if (bindingResult.hasErrors()) {
return null; // what to do here?
// how to let the client know something has gone wrong?
} else {
fooDao.insertFoo(fooDto); // What to do if an exception gets thrown here?
// What to send back to the client?
return fooDto;
}
}
答案 2 :(得分:0)
1)您需要为数据创建一个表单类
public class UserForm implements Serializable {
/**
*
*/
private static final long serialVersionUID = 1L;
@NotBlank(message = "Message Text")
private String userName;
@NotBlank(message = "Message Text")
private String passoword;
// your other filed with getter and seter
...........................
}
2)你的控制器方法:
@RequestMapping(value = "/signup", method = RequestMethod.GET)
public String create(Model model) {
model.addAttribute("userForm" , new UserForm());
return "signup";
}
@RequestMapping(value = "/signup", method = RequestMethod.POST)
public String create(@Valid @ModelAttribute UserForm userForm,Errors errors, RedirectAttributes ra, Model model) {
if (errors.hasErrors()) {
return "signup";
}
userService.createUser(userForm);
return "signup";
}
您的HTML代码:
<form role="form" th:action="@{/signup}" method="post" th:object="${userForm}">
<div class="row">
<div class="col-lg-12">
<th:block th:if="${#fields.hasErrors('${userForm.*}')}">
<div th:utext="Common error message">Alert</div>
</th:block>
<div class="form-group input-group" th:classappend="${#fields.hasErrors('userName')}? 'has-error'">
<input type="text" th:field="*{userName}" class="form-control" placeholder="Username" />
<span class="help-block" th:if="${#fields.hasErrors('userName')}" th:errors="*{userName}">Incorrect title</span>
</div>
// your other filed with submit button
</div>
</div>
</form>
注意: