使用 Spring 3 验证向导页面 [英] Validating wizard pages with Spring 3

问题描述

我开始研究如何在 Spring 中为类似向导的表单创建控制器，并遇到了 AbstractWizardFormController，我很快注意到它已被弃用.

I started researching how to create a controller for a wizard-like form in Spring and came across the AbstractWizardFormController, which I quickly noticed was deprecated.

然后我进一步挖掘并发现了如何用 Spring 3 完成类似的事情.这个例子虽然没有做任何类型的验证(例如通过 @Valid)，所以我想知道如何验证向导的每一步?

I then dug a bit further and found how to accomplish something similar with Spring 3. This example does not do any sort of validation though (e.g. via @Valid), so I'm wondering how does one validate each step of a wizard?

是否有可能每个步骤都有自己的支持 Form 对象，然后使用 @SessionAttributes 来存储它们的值，以便在调用最终提交时(大概在表单的最后一页)?

Would it be possible for each step have its own backing Form object and then use @SessionAttributes to store their values for when a final submit is called (presumably on the last page of the form)?

感谢您的帮助.

(PS:不需要 WebFlow 的解决方案是理想的.)

(P.S.: Solutions that don't require WebFlow would be ideal.)

推荐答案

我不知道有什么方法可以使用 @Valid 注释解决这个问题，但是您应该能够利用 JSR-303 验证来实现做到这一点.作为一个有点人为的例子:

I don't know of a way to pull this off with the @Valid annotation, but you should be able to take advantage of the JSR-303 validation to accomplish this. As a somewhat contrived example:

public class User {
    @NotNull(message = "First name can't be blank", groups = {Step1.class, FinalStep.class})
    private String firstName;

    @NotNull(message = "Last name can't be blank", groups = {Step1.class, FinalStep.class})
    private String lastName;

    @NotNull(message = "Email can't be blank", groups = {Step1.class, FinalStep.class})
    private String emailAddress;

    @NotNull(message = "Please provide a valid address", groups = {Step2.class, FinalStep.class})
    private Address address;

    // getters/setters...

    public interface Step1 {}
    public interface Step2 {}
    public interface FinalStep {}
}

您可以利用 JSR-303 支持验证组这一事实，通过提供标记接口来表示您的向导步骤.

You can take advantage of the fact that JSR-303 supports validation groups by providing marker interfaces to represent your wizard steps.

然后，不要依赖@Valid 注解，而是将 Validator 实例注入您的控制器并调用:

Then, instead of relying on the @Valid annotation, inject a Validator instance into your controller and call:

validator.validate(user, /*<step interface>.class*/);

在您的 processPage 方法中(在您链接的问题中引用 Controller)，然后

in your processPage method (referencing Controller in your linked question), and then

validator.validate(user, FinalStep.class);

在您的 processFinish 调用中.

in your processFinish call.

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