Struts - XML Based Validators

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Following is the list of various types of field level and non-field level validation available in Struts2:

date validator:

<field name="birthday">
<field-validator type="date">
   <param name="min">01/01/1990</param>
   <param name="max">01/01/2000</param>
   <message>
      Birthday must be within ${min} and ${max}
   </message>
</field-validator>
</field>

double validator:

<field name="percentage">
<field-validator type="double">
   <param name="minExclusive">0.123</param>
   <param name="maxExclusive">99.98</param>
   <message>
      Percentage needs to be between ${minExclusive}
      ${maxExclusive} (exclusive)
   </message>
</field-validator>
</field>

email validator:

<field name="myEmail">
<field-validator type="email">
   <message>
      Must provide a valid email
   </message>
</field-validator>
</field>

expression validator:

A Non-Field Level validator that validates based on regular expression supplied.

<field-validator type="expression">
   <param name="expression">....</param>
   <message>
      Failed to meet Ognl Expression  .... 
   </message>
</field-validator>

int validator:

<field name="age">
<field-validator type="int">
   <param name="min">5</param>
   <param name="max">50</param>
   <message>
      Age needs to be between ${min} and ${max}
   </message>
</field-validator>
</field>

regex validator:

<field name="myStrangePostcode">
<field-validator type="regex">
   <param name="fieldName">myStrangePostcode</param>
   <param name="expression">
      <![CDATA[([aAbBcCdD][123][eEfFgG][456])]]>
   </param>
</field-validator>
</field>

required validator:

<field name="username">
<field-validator type="required">
   <message>
       username must not be null
   </message>
</field-validator>
</field>

requiredstring validator:

<field name="username">
<field-validator type="requiredstring">
 <param name="trim">true</param>
   <message>
       username must not be null
   </message>
</field-validator>
</field>

stringlength validator:

<field name="username">
<field-validator type="stringlength">
 <param name="minLength">10</param>
 <param name="maxLength">10</param>
 <param name="trim">true</param>
   <message>
       Your username needs to be 10 characters long
   </message>
</field-validator>
</field>

url validator:

<field-validator type="url">
   <param name="fieldName">myHomePageURL</param>
   <message>
         Invalid homepage url
   </message>
</field-validator>


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