struts2框架校验

 Struts2框架校验执行的先后顺序：

a)首先执行校验框架（XML文件）

b)执行自定义方法的校验方法（validateMyExecute）

c)执行validate方法。

1.框架校验的参考文件

A》com/xwork/xwork-validator-1.0.2.dtd 校验器文件XX-validation.xml的规则。

B》com.opensymphony.xwork2.validator.validators下的default.xml文件。默认校验器的属性文件，各种校验validator。校验器文件XX-validation.xml中type的依据。

2.字段优先的校验器

<!DOCTYPE validators PUBLIC 
  "-//OpenSymphony Group//XWork Validator 1.0.2//EN" 
  "http://www.opensymphony.com/xwork/xwork-validator-1.0.2.dtd">

<!-- 以下的标签都是根据com/xwork/xwork-validator-1.0.2.dtd的定义，而type属性值是根据上述default.xml确定-->

<field name="username">
<field-validator type="requiredstring">
<message key="username.invalidate"></message>
</field-validator>
<field-validator type="stringlength">
<param name="minLength">4</param>
<param name="maxLength">6</param>
<message>username must between ${minLength} and ${maxLength}!</message>
</field-validator>
</field>
<field name="password">
<field-validator type="requiredstring">
<message>password can't be blank!</message>
</field-validator>
<field-validator type="stringlength">
<param name="minLength">4</param>
<param name="maxLength">6</param>
<message>password must between ${minLength} and ${maxLength}!</message>
</field-validator>
</field>
<field name="age">
<field-validator type="required">
<message>age can't be blank!</message>
</field-validator>
<field-validator type="int">
<param name="min">10</param>
<param name="max">100</param>
<message>age must between ${min} and ${max}!</message>
</field-validator>
</field>
<field name="birthday">
<field-validator type="required">
<message>birthday can't be blank!</message>
</field-validator>
<field-validator type="date">
<param name="min">2015-1-1</param>
<param name="max">2017-12-31</param>
<message>birthday must between ${min} and ${max}!</message>
</field-validator>
</field>

3. 校验器优先的校验器。

<validator type="requiredstring">

      <paramname="fieldName">username</param>

<!—注意name=”fieldName”-->

      <message>username can't beblank!</message>

 </validator>

 <validator type="stringlength">

      <paramname="fieldName">username</param>

      <paramname="minLength">4</param>    

      <paramname="maxLength">6</param>

      <message>Length of username shouldbetween ${minLenth} and ${maxLength}</message>

</validator>