需要检查用户ID存在与struts 2 [英] Need to check userid existence with struts 2

问题描述

我正在使用struts 2框架并尝试查看在数据库中检查用户ID存在的最佳方法。

在我的上一个项目中，我用jquery ajax做了这个，但是对它不满意。

在这个项目中，我使用验证框架对服务器端检查输入字段和jquery验证插件在客户端上b / p>

我有一个DAO类，它调用DB来检查是否存在，我不想使用jquery ajax但是更喜欢使用struts 2验证框架。

他们是否可以使用我的DAO类输出并使用字段表达式或使用validate方法将其与我的验证xml结合使用？如果我使用验证方法？与执行动作类相比，此方法的执行顺序是什么？我想要这种格式的订单，首先我做客户端验证，然后是服务器端验证，然后只有服务器端完成，我需要启动检查用户ID是否存在然后最终插入数据库？

我的字段操作验证文件如下所示，

 <字段名称=电子邮件> 
< field-validator type =requiredstring> 
< message>需要电子邮件< / message> 
< / field-validator> 
< field-validator type =email> 
< message>请输入有效的电子邮件ID< / message> 
< / field-validator> 
  

现在我需要检查db中是否存在电子邮件，所以我有DAO类返回true或者，如何从dao类添加验证？

解决方案

您可以在字段中添加fieldexpression验证器。 DAO返回的值应放在值栈中。如果在action类中创建getter并返回值，则很容易。

行动类：

  public boolean getMyBoolean（）{
 return myDAO.getMyboolean（）; 
} 
  

-validation.xml：

 < field name =Email> 
< field-validator type =requiredstring> 
< message>需要电子邮件< / message> 
< / field-validator> 
< field-validator type =email> 
< message>请输入有效的电子邮件ID< / message> 
< / field-validator> 
< field-validator type =fieldexpression> 
< param name =expression><！[CDATA [myBoolean == false]]>< / param> db< / message>中存在
< message>电子邮件
< / field-validator> 
< / field> 
  

I am using struts 2 framework and trying to see as what is the best way to check for user id existence in the database.

In my last project, I did this with jquery ajax,but was not satisfied with it.

In this project, I am using validation framework for server side checks for input fields and jquery validate plugin on client side.

I have a DAO class which makes call to DB to do checks for existence,I dont want to use jquery ajax but would prefer to go with struts 2 validation framework.

Is their a way I can use my output of this DAO class and combine it with my validation xml either using field expression or by using validate method ? if I use validate method ? what is the order of execution of this method compare to execute of action class ? I want the order in this format, first I do client side validation , followed by server side with validation and then only once server side is completed, I need to initiate check for user id existence and then finally do insert into the DB ?

My action validation file for field is something like below,

<field name="Email">
        <field-validator type="requiredstring">
            <message>Email is required</message>
        </field-validator> 
        <field-validator type="email">
            <message>Please enter valid email id</message>
        </field-validator>

Now I need to check if email exists in db, so for that I have DAO class which returns true or false, how do I add validation from dao class?

解决方案

You can add fieldexpression validator to the field. The value returned by DAO should be placed to the value stack. It's easy if you create a getter in the action class and return the value.

action class:

public boolean getMyBoolean(){
  return myDAO.getMyboolean();
}

-validation.xml:

<field name="Email">
    <field-validator type="requiredstring">
        <message>Email is required</message>
    </field-validator> 
    <field-validator type="email">
        <message>Please enter valid email id</message>
    </field-validator>
    <field-validator type="fieldexpression">
        <param name="expression"><![CDATA[myBoolean == false]]></param>
        <message>email exists in db</message>
    </field-validator>
</field>

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