如何在Struts 2中正确验证字段

本文介绍了如何在Struts 2中正确验证字段的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我想知道我在这里做错了什么：

I would like to know what I'm doing wrong here :

<validators> <field name="cli.idCli" > <field-validator type="requiredString" short-circuit="true"> <message>Required field (*)</message> </field-validator> <field-validator type="stringlength"> <param name="minLength">8</param> <param name="maxLength">8</param> <message>ID must has 8 characters</message> </field-validator> </field> </validators>

因为，实际上我收到了这个错误：

because, actually i'm getting this error:

错误 com.opensymphony.xwork2.validator.AnnotationActionValidatorManager 加载文件时出现异常 ... / action / ServiceAction-findPets-validation。 xml无效验证类型：requiredString - field-validator

ERROR com.opensymphony.xwork2.validator.AnnotationActionValidatorManager Caught exception while loading file .../action/ServiceAction-findPets-validation.xml Invalid validation type: requiredString - field-validator

另外，我想知道是否进行ajax调用（和发送JSON数据）我可以验证这些数据的存在吗？我的意思是通过.xml验证器。此外，如果我实现 Validateable 接口，每次请求到达此操作时，此方法将被触发？有没有办法指定它是哪种操作方法？

Also, I would like to know if doing ajax calls (and sending JSON data) I can validate the existence of these data ? I mean through .xml validators. Moreover, if I implement Validateable interface, each time that a request arrives to this action this method is going to be triggered? Is there a way to specify for which action methods is it?

推荐答案

名称区分大小写，你应该使用

The name is case sensitive, you should use

<field-validator type="requiredstring" short-circuit="true">

数据可以在填充到操作后进行验证。您可以使用 * - validation.xml 或以编程方式通过以声明式方式执行此操作验证（）。

The data can be validated after it's populated to the action. Either you do it in a declarative way using *-validation.xml or programmatically via validate().

您可以配置验证拦截器以在这两种方式之间进行选择，因为默认情况下验证（）在声明性验证完成后运行，即使它们是短路的。

You can configure validation interceptor to choose between these two ways, because by default validate() runs after declarative validations are done even if they are short-circuit.

考虑使用 alwaysInvokeValidate 参数。如果将别名验证文件用作 ActionClass-alias-validation.xml ，则仅对此操作别名运行验证。映射操作方法时，可以使用此别名。

Consider using alwaysInvokeValidate parameter. If you use aliased validation files as ActionClass-alias-validation.xml then validations are run for this action alias only. You can use this alias when you map your action methods.