使用@Valid的Spring验证表单不起作用 [英] Validation form in Spring using @Valid not work

问题描述

我想验证我的表单，但这不起作用。
我的实体类

I want to validation my form, but this not work. My entity class

import java.io.Serializable;
import java.util.Set;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.Table;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;

import org.hibernate.validator.constraints.Email;

@Entity
@Table(name = "users")
public class User implements Serializable {

    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue
    @Column(name = "id")
    private Integer id;
    @NotNull
    @Size(max = 20)
    @Column(name = "username")
    private String username;
    @NotNull
    @Size(max = 20)
    @Column(name = "password")
    private String password;
    @NotNull
    @Size(max = 20)
    @Column(name = "firstName")
    private String firstName;
    @NotNull
    @Size(max = 20)
    @Column(name = "lastName")
    private String lastName;
    @Size(min = 11, max = 11)
    @Column(name = "personalId")
    private String personalId;
    @Size(max = 40)
    @Column(name = "city")
    private String city;
    @Size(max = 40)
    @Column(name = "address")
    private String address;
    @NotNull
    @Email
    @Size(max = 30)
    @Column(name = "email")
    private String email;
    @Size(min = 9, max = 9)
    @Column(name = "phone")
    private String phone;
    @OneToMany(mappedBy = "user")
    private Set<UserRole> userRoleSet;
}

adminList.jsp并转至addAdmin页面：

adminList.jsp and form go to addAdmin page:

<form action="addAdminForm" method="post">
    <input type="submit" value="Dodaj administratora" />
</form>

addAdmin.jsp页面格式：

addAdmin.jsp page formule:

    <form:form action="addAdmin" modelAttribute="user" method="post">
    <form:label path="username">Login: </form:label>
    <form:input path="username" />
    <form:errors path="username" cssClass="error" />
    <br />
    <form:label path="password">Hasło: </form:label>
    <form:password path="password" />
    <form:errors path="password" cssClass="error" />
    <br />
    <form:label path="firstName">Imię: </form:label>
    <form:input path="firstName" />
    <form:errors path="firstName" cssClass="error" />
    <br />
    <form:label path="lastName">Nazwisko: </form:label>
    <form:input path="lastName" />
    <form:errors path="lastName" cssClass="error" />
    <br />
    <form:label path="email">Email: </form:label>
    <form:input path="email" />
    <form:errors path="email" cssClass="error" />
    <br />
    <input type="submit" value="Dodaj" />
</form:form>

控制器：

    @RequestMapping(value = "/admin/addAdminForm", method = RequestMethod.POST)
public ModelAndView goAddAdminForm() {
    ModelAndView mav = new ModelAndView("admin/addadmin");
    mav.addObject("user", new User());
    return mav;
}

@RequestMapping(value = "/admin/addAdmin", method = RequestMethod.POST)
public String addAdmin(@Valid @ModelAttribute("user") User user,
        BindingResult result, Model model) {
    if (result.hasErrors()) {
        return "admin/addadmin";
    } else {
        userService.createUser(user);
        user = userService.findByUsername(user.getUsername());
        UserRole userRole = new UserRole("ROLE_ADMIN");
        userRole.setUser(user);
        userRoleService.createUserRole(userRole);
        return "redirect:/admin/adminlist";
    }
}

当我尝试发送空配方时，我应该收到错误消息 result.hasErrors（）不返回错误，我的应用程序转到其他位置并尝试保存用户。为什么@Valid不起作用？

When i try send empty formule i should get error messages result.hasErrors() not return error and my application go to else and try save user. Why @Valid not work?

推荐答案

您确定验证无效吗？除非您有 StringTrimmerEditor 已注册，您提交的字段实际上是长度等于0的String实例，而不是 null 值

Are you sure that the validations don't work? Unless you have for example StringTrimmerEditor registered, your fields will actually be String instances with length equal to 0, not null values when you submit the form and therefore the annotation would consider such values to be valid.

如果要验证String不是空白（不是null且不是空String），请使用例如 @NotBlank 注释。我也自己尝试过了， @Email 注释也为空字符串传递，这意味着您的空表格现在实际上是有效的。

If you want to validate that String is not blank (not null and not an empty String), use for instance the @NotBlank annotation. Also I just tried it myself and the @Email annotation also passes for empty Strings, which would mean that your empty form IS actually valid right now.

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