我正在创建一个Spring MVC（4.2.1）/ Hibernate（5.0.1）Web应用程序。我正在尝试在表单中进行错误验证。
验证本身正在运行。当我在控制器中调用result.getAllErrors()时。我得到以下输出：
[Field error in object 'user' on field 'first_name': rejected value [a];
codes [Size.user.first_name,Size.first_name,Size];
arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [user.first_name,first_name];
arguments [];
default message [first_name],4,2];
default message [size must be between 2 and 4]
]
我的.jsp文件中的<form:errors />不能正常工作。它根本不输出任何东西。
有人知道如何解决这个问题吗？
create.jsp（查看）
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="spring" uri="http://www.springframework.org/tags" %>
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
<%@ taglib prefix="tg" tagdir="/WEB-INF/tags" %>
<div class="container-fluid">
<ol class="breadcrumb">
<li><a href="/host/manage/dashboard/index"><spring:message code="dashboard.title" /></a></li>
<li><a href="/host/manage/users/index"><spring:message code="user.title" /></a></li>
<li class="active"><spring:message code="user.create_entity" /></li>
</ol>
<form:form method="post" modelAttribute="user" autocomplete="off">
<div class="panel panel-default">
<div class="panel-heading">
<strong><spring:message code="user.title" /></strong>
<p><spring:message code="user.create_entity" /></p>
</div>
<div class="panel-body">
<div class="row">
<div class="col-md-6">
<div class="form-group">
<label for="firstName"><spring:message code="user.first_name" /></label>
<spring:message code="user.first_name_placeholder" var="user_first_name_placeholder"/>
<form:input type="text" path="firstName" class="form-control" id="firstName" placeholder="${user_first_name_placeholder}" autocomplete="off" />
<form:errors path="firstName" />
</div>
</div>
<div class="col-md-6">
<div class="form-group">
<label for="lastName"><spring:message code="user.last_name" /></label>
<spring:message code="user.last_name_placeholder" var="user_last_name_placeholder"/>
<form:input type="text" path="lastName" class="form-control" id="lastName" placeholder="${user_last_name_placeholder}" autocomplete="off" />
</div>
</div>
</div>
<div class="row">
<div class="col-md-12">
<div class="form-group">
<label for="email"><spring:message code="user.email" /></label>
<spring:message code="user.email_placeholder" var="user_email_placeholder"/>
<form:input type="email" path="email" class="form-control" id="email" placeholder="${user_email_placeholder}" autocomplete="off" />
</div>
</div>
</div>
<div class="row">
<div class="col-md-6">
<div class="form-group">
<label for="password"><spring:message code="user.password" /></label>
<spring:message code="user.password_placeholder" var="user_password_placeholder"/>
<form:input type="password" path="password" class="form-control" id="password" placeholder="${user_password_placeholder}" autocomplete="off" />
</div>
</div>
<div class="col-md-6">
<div class="form-group">
<label for="passwordConfirmation"><spring:message code="user.password_confirmation" /></label>
<spring:message code="user.password_confirmation_placeholder" var="user_password_confirmation_placeholder"/>
<form:input type="password" path="passwordConfirmation" class="form-control" id="passwordConfirmation" placeholder="${user_password_confirmation_placeholder}" autocomplete="off" />
</div>
</div>
</div>
<div class="row">
<div class="col-md-12">
<div class="form-group">
<label for="role"><spring:message code="user.role" /></label>
<form:select path="role" id="role" class="form-control" required="required">
<option default>-- <spring:message code="general.click_to_select" /> --</option>
<c:forEach items="${roles}" var="role">
<c:set value="user.${role }" var="roleMessage" />
<option value="${role }"><spring:message code="${roleMessage }"/></option>
</c:forEach>
</form:select>
</div>
</div>
</div>
<div class="row">
<div class="col-md-12">
<div class="form-group">
<label for="enabled"><spring:message code="user.enabled" /></label>
<form:select path="enabled" id="enabled" class="form-control" required="required">
<option default>-- <spring:message code="general.click_to_select" /> --</option>
<option value="1"><spring:message code="user.enabled_1" /></option>
<option value="0"><spring:message code="user.enabled_0" /></option>
</form:select>
</div>
</div>
</div>
</div>
<div class="panel-footer">
<form:button type="submit" class="btn btn-sm btn-success"><spring:message code="general.save" /></form:button>
</div>
</div>
</form:form>
</div>
UserController.java（控制器）
package com.klm.workshop.controller.host.manage;
import com.klm.workshop.dao.UserDAO;
import com.klm.workshop.model.User;
import javax.validation.Valid;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.support.PagedListHolder;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;
/**
* Host manage users controller
*
* @author -
*/
@Controller("hostManageUserController")
@RequestMapping(value="/host/manage")
public class UserController {
/**
* User data access object
*/
@Autowired
private UserDAO userDAO;
/**
* List of users
*
* @param model Objects and view
* @param page Current pagination page
* @param search Search value
* @return The users list view
*/
@RequestMapping(value="/users/index", method=RequestMethod.GET)
public ModelAndView index(
ModelAndView model,
@RequestParam(name="p", required=false, defaultValue = "0") int page,
@RequestParam(name="search", required=false, defaultValue = "") String search
) {
PagedListHolder pagedListHolder = new PagedListHolder();
pagedListHolder.setSource(userDAO.searchAll(search));
pagedListHolder.setPage(page);
model.addObject("pagedListHolder", pagedListHolder);
model.setViewName("host/manage/users/index");
return model;
}
/**
* Show create user form
*
* @param model Objects and view
* @return Form to create a user
*/
@RequestMapping(value="/users/create", method=RequestMethod.GET)
public ModelAndView getCreate(ModelAndView model) {
model.addObject("user", new User());
model.addObject("roles", User.Role.values());
model.setViewName("host/manage/users/create");
return model;
}
/**
* Create user, and show create user form
*
* @param model Objects and view
* @param user The posted user
* @param result Binded validation
* @return Form to create a user, or a redirect (if user was created successfully)
*/
@RequestMapping(value="/users/create", method=RequestMethod.POST)
public ModelAndView postCreate(
ModelAndView model,
@ModelAttribute("user") @Valid User user,
BindingResult result
) {
if (result.hasErrors()) {
model.addObject("user", user);
model.addObject("roles", User.Role.values());
model.setViewName("host/manage/users/create");
} else {
model.setViewName("redirect:/host/manage/users/create");
}
return model;
}
}
User.java（型号）
package com.klm.workshop.model;
import java.io.Serializable;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.EnumType;
import javax.persistence.Enumerated;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.persistence.Transient;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;
import org.hibernate.validator.constraints.Email;
/**
* User model
*
* @author -
*/
@Entity
@Table(name="users")
public class User implements Serializable {
/**
* Host role (enum value for the user role)
*/
public static final String ROLE_HOST = "ROLE_HOST";
/**
* Participant role (enum value for the user role)
*/
public static final String ROLE_PARTICIPANT = "ROLE_PARTICIPANT";
/**
* Administrator role (enum value for the user role)
*/
public static final String ROLE_ADMINISTRATOR = "ROLE_ADMINISTRATOR";
/**
* Host action
*/
public static final String ACTION_HOST = "host";
/**
* Participate action
*/
public static final String ACTION_PARTICIPATE = "participate";
/**
* Identifier for user
*/
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
@Column(name="id")
private int id;
/**
* Email from the user
*/
@Email
@NotNull
@Column(name="email")
private String email;
/**
* Hashed password from the user
*/
@NotNull
@Column(name="password")
private String password;
/**
* Hashed password confirmation from the user
*/
@Transient
private String password_confirmation;
/**
* Role from the user
*/
@Enumerated(EnumType.STRING)
@NotNull
@Column(name="role")
private Role role;
/**
* If user is blocked
*/
@NotNull
@Column(name="enabled")
private boolean enabled;
/**
* User's first name
*/
@NotNull
@Size(min = 2, max = 4)
@Column(name="first_name")
private String first_name;
/**
* User's last name (also containing optional insertion)
*/
@NotNull
@Size(min = 2, max = 255)
@Column(name="last_name")
private String last_name;
/**
* User's action (want does the user want to do, participate or host)
*/
@Transient
private String action;
/**
* User's workshop (only set if the user is a participant)
*/
@Transient
private Workshop workshop;
/**
* Enum values for the role column
*/
public enum Role {
ROLE_PARTICIPANT,
ROLE_HOST,
ROLE_ADMINISTRATOR;
}
/**
* @return the id
*/
public int getId() {
return id;
}
/**
* @param id the id to set
*/
public void setId(int id) {
this.id = id;
}
/**
* @return the email
*/
public String getEmail() {
return email;
}
/**
* @param email the email to set
*/
public void setEmail(String email) {
this.email = email;
}
/**
* @return the hashed password
*/
public String getPassword() {
return password;
}
/**
* @param password the password to set
*/
public void setPassword(String password) {
BCryptPasswordEncoder bcrypt = new BCryptPasswordEncoder();
String hashedPassword = bcrypt.encode(password);
this.password = hashedPassword;
}
/**
* @return the hashed password
*/
public String getPasswordConfirmation() {
return password_confirmation;
}
/**
* @param password_confirmation the password confirmation to set
*/
public void setPasswordConfirmation(String password_confirmation) {
BCryptPasswordEncoder bcrypt = new BCryptPasswordEncoder();
String hashedPassword = bcrypt.encode(password_confirmation);
this.password_confirmation = hashedPassword;
}
/**
* @return the role
*/
public Role getRole() {
return role;
}
/**
* @param role the role to set
*/
public void setRole(Role role) {
this.role = role;
}
/**
* @return the enabled status
*/
public boolean getEnabled() {
return enabled;
}
/**
* @param enabled the enabled status to set
*/
public void setEnabled(boolean enabled) {
this.enabled = enabled;
}
/**
* @return the first_name
*/
public String getFirstName() {
return first_name;
}
/**
* @param first_name the first_name to set
*/
public void setFirstName(String first_name) {
this.first_name = first_name;
}
/**
* @return the last_name
*/
public String getLastName() {
return last_name;
}
/**
* @param last_name the last_name to set
*/
public void setLastName(String last_name) {
this.last_name = last_name;
}
/**
* @return the first_name and last_name
*/
public String getFullName() {
return getFirstName() + " " + getLastName();
}
/**
* @return the action
*/
public String getAction() {
return action;
}
/**
* @param action the action to set
*/
public void setAction(String action) {
this.action = action;
}
/**
* @return the workshop
*/
public Workshop getWorkshop() {
if(this.action.equals(ACTION_HOST)) {
throw new UnsupportedOperationException("Workshop cannot be returned when user is hosting a workshop");
}
return workshop;
}
/**
* @param workshop the workshop to set
*/
public void setWorkshop(Workshop workshop) {
if(this.action.equals(ACTION_HOST)) {
throw new UnsupportedOperationException("Workshop cannot be set when user is hosting a workshop");
}
this.workshop = workshop;
}
}
答案 0 :(得分：1)
您正在执行重定向 model.setViewName（ “重定向：/主机/管理/用户/创建”）;
您的错误存储在模型中，随后存储在HttpServletRequest属性中。这些仅在一个请求的持续时间内持续。重定向导致客户端发送新请求。因此，在渲染重定向视图时，它们不存在。
考虑使用flash属性。
请看下面的例子