具有ModelAndView的Spring MVC验证 [英] Spring MVC Validation w/ ModelAndView
问题描述
我正在尝试为我的Spring MVC应用程序添加验证。以前尝试设置验证我一直在使用ModelAndView来提供jsp页面，但不会显示错误消息。
I am trying to add validation to my Spring MVC Application. Previously to attempting to set up validation I have been using ModelAndView to serve up the jsp pages but the error messages do not display.
Model
@Entity
@Table(name = "employee")
public class Employee {
@Id
@NotEmpty(message = "Please enter your email addresss.")
@Email
private String email;
@NotEmpty
@Pattern(regexp="[a-zA-Z0-9]")
private String password;
@NotEmpty
private String firstName;
@NotEmpty
private String lastName;
@NotEmpty
private String phoneNum;
private boolean assigned;
public Employee() {
}
// getters and setters
}
控制器
@RestController
@RequestMapping("/employee")
public class EmployeeController {
private static final Logger LOGGER = LogManager
.getLogger(EmployeeController.class.getName());
@Autowired
private EmployeeServiceImpl employeeService;
@RequestMapping(value = "/new", method = RequestMethod.GET)
public ModelAndView getRegisterView(Model m) {
return new ModelAndView("addEmployee", "employeeForm", new Employee());
}
@RequestMapping(value = "/register", method = RequestMethod.POST)
public ModelAndView postUser(@Valid Employee employee, BindingResult result) {
ModelAndView model;
if (result.hasErrors()) {
model = new ModelAndView("addEmployee", "employeeForm", employee);
} else {
employeeService.addEmployee(employee);
model = new ModelAndView();
model.setViewName("displayEmployee");
model.addObject("employees", employeeService.getEmployees());
}
return model;
}
}
表格
<form:form class="form-horizontal" role="form" method="POST"
action="register" commandName="employeeForm" modelattribute="employee">
<div class="form-group">
<form:label path="firstName"
class="control-label col-lg-2 col-lg-offset-2 col-md-2 col-md-offset-2 col-sm-12"
for="fname">First Name:</form:label>
<div class="col-lg-6 col-md-6 col-sm-12">
<form:input path="firstName" class="form-control" id="fname"
placeholder="First Name" />
<form:errors path="firstName" />
</div>
</div>
<div class="form-group">
<form:label path="lastName"
class="control-label col-lg-2 col-lg-offset-2 col-md-2 col-md-offset-2 col-sm-12"
for="lname">Last Name:</form:label>
<div class="col-lg-6 col-md-6 col-sm-12">
<form:input path="lastName" class="form-control" id="lname"
placeholder="Last Name" />
<form:errors path="lastName" />
</div>
</div>
<div class="form-group">
<form:label path="email"
class="control-label col-lg-2 col-lg-offset-2 col-md-2 col-md-offset-2 col-sm-12"
for="email">Email:</form:label>
<div class="col-lg-6 col-md-6 col-sm-12">
<form:input path="email" type="email" class="form-control"
id="email" placeholder="Email" />
<form:errors path="email" cssClass="error" />
</div>
</div>
<div class="form-group">
<form:label path="phoneNum"
class="control-label col-lg-2 col-lg-offset-2 col-md-2 col-md-offset-2 col-sm-12"
for="phoneNum">Phone Number:</form:label>
<div class="col-lg-6 col-md-6 col-sm-12">
<form:input path="phoneNum" class="form-control" id="phoneNum"
placeholder="Phone Number" />
<form:errors path="phoneNum" />
</div>
</div>
<div class="form-group">
<form:label path="password"
class="control-label col-lg-2 col-lg-offset-2 col-md-2 col-md-offset-2 col-sm-12"
for="pwd">Password:</form:label>
<div class="col-lg-6 col-md-6 col-sm-12 controls">
<form:input path="password" type="password" class="form-control"
id="pwd" placeholder="Password" />
<form:errors path="password" />
</div>
</div>
<div class="form-group form-actions">
<div
class="col-lg-offset-4 col-lg-1 col-md-offset-4 col-md-1 col-sm-1">
<button type="submit" class="btn btn-primary">Register</button>
</div>
<div class="col-lg-1 col-md-1 col-sm-1">
<button type="reset" class="btn btn-primary">Clear</button>
</div>
</div>
<form:hidden path="assigned" value="false" />
</form:form>
推荐答案
model = new ModelAndView("addEmployee", "employeeForm", employee);
您在代码中自行销毁模型，因此返回页面时基本上没有剩下任何内容。返回 ModelAndView 时，Spring MVC假设您已准备好并添加了自己渲染视图所需的所有内容。
You are destroying the model yourself in your code, so when returning to the page there is basically nothing left. When returning a ModelAndView Spring MVC assumes that you have prepared and added everything needed for rendering the view yourself.
将 @ModelAttribute（employeeForm）添加到 @Valid 注释旁边的方法参数中，并使用已存在的模型从 BindingResult 构建一个 ModelAndView 。
Instead add @ModelAttribute("employeeForm") to your method argument next to the @Valid annotation and use the already existing model from the BindingResult to construct a ModelAndView.
@RequestMapping(value = "/register", method = RequestMethod.POST)
public ModelAndView postUser(@Valid @ModelAttribute("employeeForm" Employee employee, BindingResult result) {
ModelAndView model;
if (result.hasErrors()) {
model = new ModelAndView("addEmployee", result.getModel());
虽然这样可行但为什么不简单地返回 String 作为视图的名称，并在需要时做一些模型准备。
Although this will work why not simply return a String as the name of the view and do some Model preparation when needed.
@RequestMapping(value = "/register", method = RequestMethod.POST)
public String postUser(@Valid @ModelAttribute("employeeForm") Employee employee, BindingResult result, Model model) {
if (result.hasErrors()) {
return "addEmployee";
} else {
employeeService.addEmployee(employee);
model.addObject("employees", employeeService.getEmployees());
return "displayEmployee";
}
}
我甚至认为填写 不属于此处，而是在为该页面准备模型的单独方法中。 displayEmployee 页面的模型
I would even argue that filling the Model for the displayEmployee page doesn't belong here but in a separate method preparing the model for that page.
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