struts2框架验证问题

Question

我想问两个问题。。1：如何用验证框架，验证输入的是不是浮点类型。
2：简要的讲一下struts2提供的几个框架验证的用法。 <validator name="required" class="com.opensymphony.xwork2.validator.validators.RequiredFieldValidator"/>
    <validator name="requiredstring" class="com.opensymphony.xwork2.validator.validators.RequiredStringValidator"/>
    <validator name="int" class="com.opensymphony.xwork2.validator.validators.IntRangeFieldValidator"/>
    <validator name="double" class="com.opensymphony.xwork2.validator.validators.DoubleRangeFieldValidator"/>
    <validator name="date" class="com.opensymphony.xwork2.validator.validators.DateRangeFieldValidator"/>
    <validator name="expression" class="com.opensymphony.xwork2.validator.validators.ExpressionValidator"/>
    <validator name="fieldexpression" class="com.opensymphony.xwork2.validator.validators.FieldExpressionValidator"/>
    <validator name="email" class="com.opensymphony.xwork2.validator.validators.EmailValidator"/>
    <validator name="url" class="com.opensymphony.xwork2.validator.validators.URLValidator"/>
    <validator name="visitor" class="com.opensymphony.xwork2.validator.validators.VisitorFieldValidator"/>
    <validator name="conversion" class="com.opensymphony.xwork2.validator.validators.ConversionErrorFieldValidator"/>
    <validator name="stringlength" class="com.opensymphony.xwork2.validator.validators.StringLengthFieldValidator"/>
    <validator name="regex" class="com.opensymphony.xwork2.validator.validators.RegexFieldValidator"/>

Answer 1

这你找本struts2的教程看看就知道怎么用了呀，网上找找
附：struts2权威指南http://download.csdn.net/down/706207/sdan250

Answer 2

1：现成的验证是否某一类型不知道，自己实现一个？？
2：
以下只写<field>的形式
<validator name="required" class="com.opensymphony.xwork2.validator.validators.RequiredFieldValidator"/>
必填验证器 例:
<field name="username">
  <field-validator type="required">
    <message>username must not be null.</message>
  </field-validator>
</field>
--------------------------------------------
<validator name="requiredstring" class="com.opensymphony.xwork2.validator.validators.RequiredStringValidator"/>
必填字符串验证器 例:
<field name="username">
  <field-validator type="requiredstring">
    <param name="trim">true</param>
    <message>username is required.</message>
  </field-validator>
</field>
--------------------------------------------
<validator name="int" class="com.opensymphony.xwork2.validator.validators.IntRangeFieldValidator"/>
整形验证器 例:
<field name="age">
  <field-validator type="int">
    <param name="min">1</param>
    <param name="max">100</param>
    <message>xxxxxxxxxxxxxxxxxxx</message>
  </field-validator>
</field>
--------------------------------------------
<validator name="double" class="com.opensymphony.xwork2.validator.validators.DoubleRangeFieldValidator"/>
浮点数验证器 例:
<field name="percent">
  <field-validator type="double">
    <param name="minExclusive">0.111</param>
    <param name="maxExclusive">99.99</param>
    <message>xxxxxxxxxxxxxxxxxxx</message>
  </field-validator>
</field>
--------------------------------------------
<validator name="date" class="com.opensymphony.xwork2.validator.validators.DateRangeFieldValidator"/>
日期验证器 例:
<field name="birthday">
  <field-validator type="date">
    <param name="min">01/01/1999</param>
    <param name="max">02/02/2002</param>
    <message>xxxxxxxxxxxxxxxxxxx</message>
  </field-validator>
</field>
--------------------------------------------
<validator name="expression" class="com.opensymphony.xwork2.validator.validators.ExpressionValidator"/>
表达式验证器 例:
<validator type="expression">
  <param name="expression">user.aa==bb</param>
  <message>xxxxxxxxxxx</message>
</validator>
--------------------------------------------
<validator name="fieldexpression" class="com.opensymphony.xwork2.validator.validators.FieldExpressionValidator"/>
字段表达式验证器 例:
<field name="confirm">
  <field-validator type="fieldexpression">
    <param name="expression">user.aa==bb</param>
    <message>xxxxxxxxxxxxxxxxxxx</message>
  </field-validator>
</field>
--------------------------------------------
<validator name="email" class="com.opensymphony.xwork2.validator.validators.EmailValidator"/>
邮件地址验证器 例:
<field name="myemail">
  <field-validator type="email">
    <message>xxxxxxxxxxxxxxxxxxx</message>
  </field-validator>
</field>
--------------------------------------------
<validator name="url" class="com.opensymphony.xwork2.validator.validators.URLValidator"/>
网址 例:
<field name="myurl">
  <field-validator type="url">
    <message>xxxxxxxxxxxxxxxxxxx</message>
  </field-validator>
</field>
--------------------------------------------
<validator name="visitor" class="com.opensymphony.xwork2.validator.validators.VisitorFieldValidator"/>
较多，自己翻书
--------------------------------------------
<validator name="conversion" class="com.opensymphony.xwork2.validator.validators.ConversionErrorFieldValidator"/>
转换 例:
<field name="myfield">
  <field-validator type="conversion">
    <param name="repopulateField">true</param>
    <message>xxxxxxxxxxxxxxxxxxx</message>
  </field-validator>
</field>
--------------------------------------------
<validator name="stringlength" class="com.opensymphony.xwork2.validator.validators.StringLengthFieldValidator"/>
字段长度 例:
<field name="str">
  <field-validator type="stringlength">
    <param name="minLength">1</param>
    <param name="maxLength">10</param>
    <param name="trime">true</param>
    <message>xxxxxxxxxxxxxxxxxxx</message>
  </field-validator>
</field>
--------------------------------------------
<validator name="regex" class="com.opensymphony.xwork2.validator.validators.RegexFieldValidator"/>
正则 例:
<field name="zipcode">
  <field-validator type="regex">
    <param name="expression"><![CDATA[[0-9]\d{5}(?!\d)]]></param>
    <message>xxxxxxxxxxxxxxxxxxx</message>
  </field-validator>
</field>
--------------------------------------------

Answer 3

你的action需要继承了ActionSupport，
1：重写validate()方法，这样调用action的所有方法都会经过validate()方法校验，
2：重写validateXxx()方法，Xxx为你需要校验的action中的方法名，只会对指定的方法校验。
3：xml校验文件的。<validators>
  <!--校验action的xxx属性-->
  <field name="xxx">
     <!--指定xxx属性满足的规则-->
     <field-validator type="double">
     </field-validator>
     <!--出错提示信息-->
     <message>请输入正确的数字</message>
  </field>
</validators>
xml文件要放到跟action同一个包下，文件名为:action的类名-validation.xml

Answer 4

这样！！！<field name="age">
  <field-validator type="int">
<param name="min">1</param>
<param name="max">133</param>
<message>age must between ${1} and ${133}</message>
  </field-validator>
</field>