Struts 2校验器的使用例子

required 必填校验器
<field-validator type="required">
<message>性别不能为空!</message>
</field-validator>

requiredstring 必填字符串校验器
<field-validator type="requiredstring">
<param name="trim">true</param>
<message>用户名不能为空!</message>
</field-validator>

stringlength：字符串长度校验器
<field-validator type="stringlength">
<param name="maxLength">10</param>
<param name="minLength">2</param>
<param name="trim">true</param>
<message><![CDATA[产品名称应在2-10个字符之间]]></message>
</field-validator>
required 必填校验器
<field-validator type="required">
<message>性别不能为空!</message>
</field-validator>

requiredstring 必填字符串校验器
<field-validator type="requiredstring">
<param name="trim">true</param>
<message>用户名不能为空!</message>
</field-validator>

stringlength：字符串长度校验器
<field-validator type="stringlength">
<param name="maxLength">10</param>
<param name="minLength">2</param>
<param name="trim">true</param>
<message><![CDATA[产品名称应在2-10个字符之间]]></message>
</field-validator>
required 必填校验器
<field-validator type="required">
<message>性别不能为空!</message>
</field-validator>

requiredstring 必填字符串校验器
<field-validator type="requiredstring">
<param name="trim">true</param>
<message>用户名不能为空!</message>
</field-validator>

stringlength：字符串长度校验器
<field-validator type="stringlength">
<param name="maxLength">10</param>
<param name="minLength">2</param>
<param name="trim">true</param>
<message><![CDATA[产品名称应在2-10个字符之间]]></message>
</field-validator>
required 必填校验器
<field-validator type="required">
<message>性别不能为空!</message>
</field-validator>

requiredstring 必填字符串校验器
<field-validator type="requiredstring">
<param name="trim">true</param>
<message>用户名不能为空!</message>
</field-validator>

stringlength：字符串长度校验器
<field-validator type="stringlength">
<param name="maxLength">10</param>
<param name="minLength">2</param>
<param name="trim">true</param>
<message><![CDATA[产品名称应在2-10个字符之间]]></message>
</field-validator>
int：整数校验器
<field-validator type="int">
<param name="min">1</param>
<param name="max">150</param>
<message>年龄必须在1-150之间</message>
</field-validator>

字段OGNL表达式校验器
<field name="imagefile">
<field-validator type="fieldexpression">
<param name="expression"><![CDATA[imagefile.length() <= 0]]></param>
<message>文件不能为空</message>
</field-validator>
</field>