java 使用 spring 3 注释发送成功或错误消息以查看
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sending success or error message to view with spring 3 annotations
提问by coder247
I've a jsp page which is like this:
我有一个像这样的jsp页面：
<form:form action="userRegistration" name="userRegistrationForm" commandName="userRegistration">
<form:input path="userName"/>
<form:input path="houseNo"/>
</form:form>
and all the required fields.
以及所有必填字段。
In controller I use like this:
在控制器中，我是这样使用的：
@RequestMapping(method=RequestMethod.GET)
public String registration(ModelMap model,HttpSession session) {
UserRegistration userRegistration = service.createUserRegistration();
model.addAttribute("userRegistration",userRegistration);
return "registrationview";
}
@RequestMapping(method=RequestMethod.POST)
public String getRegistration(UserRegistration userRegistration, HttpSession session, ModelMap model) {
boolean result = validateAndSaveData(userRegistration);
if (result){
}
}
when the user submits the form, it comes to the post and then validates the input and saves it. How can I send a succes message and error message to the view. Is there any changes required in the existing implementation ?
当用户提交表单时，它会进入帖子，然后验证输入并保存它。如何向视图发送成功消息和错误消息。现有的实现是否需要进行任何更改？
回答by stephen.hanson
@RequestMapping(method=RequestMethod.POST)
public String getRegistration(UserRegistration userRegistration, HttpSession session, ModelMap model) {
boolean result = validateAndSaveData(userRegistration);
if (result){
model.addAttribute("successMsg", "Form successfully submitted");
return "successPage";
}
else {
model.addAttribute("errorMsg", "Your form submission contains errors.");
return "formPage";
}
}
I agree with Shagaan that you should look into using Spring's built-in support for JSR-303 validation to validate the form. Here's a little info on how to do that. First, annotate your form with JSR-303 (javax.validation) annotations:
我同意 Shagaan 的观点，您应该考虑使用 Spring 对 JSR-303 验证的内置支持来验证表单。这里有一些关于如何做到这一点的信息。首先，使用 JSR-303 (javax.validation) 注释来注释您的表单：
public class UserRegistration {
@NotNull
@Size(max=7)
private String name;
@Min(0)
private int houseNo;
...
}
Then annotate your model in the controller method with "@Valid":
然后使用“@Valid”在控制器方法中注释您的模型：
@RequestMapping(method=RequestMethod.POST)
public String getRegistration(@Valid UserRegistration userRegistration, BindingResult result, HttpSession session, ModelMap model) {
if (result.hasErrors()){
model.addAttribute("errorMsg", "Your form submission contains errors.");
return "formPage";
}
model.addAttribute("successMsg", "Form successfully submitted");
return "successPage";
}
Spring's BindingResult automatically binds the errors to your form object, so then in your jsp, you could do:
Spring 的 BindingResult 会自动将错误绑定到您的表单对象，因此在您的 jsp 中，您可以执行以下操作：
<form:form action="userRegistration" name="userRegistrationForm" commandName="userRegistration">
<form:input path="userName"/> <form:errors path="userName" cssClass="error"/>
<form:input path="houseNo"/> <form:errors path="houseNo" cssClass="error"/>
</form:form>
To use Spring validation, you need Validation-api (JSR-303 spec) and an implementation (Hibernate-Validator) in your classpath. See Section 6.7 of Spring validation docs
要使用 Spring 验证，您需要在类路径中使用 Validation-api（JSR-303 规范）和一个实现（Hibernate-Validator）。请参阅Spring 验证文档的第 6.7 节
回答by Jelly
You can save in request :model.addAttribute("message","sussess");
您可以保存在请求 :model.addAttribute("message","sussess");
