Struts2内建校验器(基于校验框架的文件校验)

位于xwork-2.0.4.jar压缩包中( com.opensymphony.xwork2.validator.validators)有个文件default.xml ,该文件中定义了Struts2框架内建的校验器。default.xml文件定义了常用的校验器类型。

 

<validators>

    <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="long" class="com.opensymphony.xwork2.validator.validators.LongRangeFieldValidator"/>

    <validator name="short" class="com.opensymphony.xwork2.validator.validators.ShortRangeFieldValidator"/>

    <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"/>

    <validator name="conditionalvisitor" class="com.opensymphony.xwork2.validator.validators.ConditionalVisitorFieldValidator"/>

</validators>

 

二、各种类型校验器

 

1、类型转换检验器:

1)非字段校验:

    <validator type="conversion">

        <param name="fieldName">myField</param>

        <message>类型转换错误</message>

        <param name ="repopulateField">true</param> 

    </validator>

2)字段校验:

    <field name="myField">

        <field-validator type="conversion">

            <message>类型转换错误</message>

            <param name ="repopulateField">true</param> 

        </field-validator>

    </field>

  • fieldName:该参数指定检查是否存在转换异常的字段名称,如果是字段校验,则不用指定该参数。
  • repopulateField:该参数指定当类型转换失败后,返回input页面时,类型转换失败的表单是否保留原来的错误输入。true为保留,false为不保留。

2、日期校验器:

1)非字段校验:

    <validator type="date">

        <param name="fieldName">birthday</param>

        <param name="min">1990-01-02</param>

        <param name="max">2010-07-28</param>

        <message>生日数据错误</message>

    </validator>

2)字段校验:

    <field name="birthday">

        <field-validator type="date">

            <param name="min">1990-01-01</param>

            <param name="max">2010-07-28</param>

            <message key="error.birthday"></message>

        </field-validator>

    </field>

  • min:指定字段日期值的最小值,该参数为可选参数。
  • max:指定字段日期值的最大值,该参数为可选参数。

3、浮点数值校验器:

1)非字段校验:

    <validator type="double">

        <param name="fieldName">percentage</param>

        <param name="minInclusive">20.1</param>

        <param name="maxInclusive">50.1</param>

        <message>生日数据错误</message>

    </validator>

2)字段校验:

    <field name="percentage">

        <field-validator type="double">

            <param name="minInclusive">20.1</param>

            <param name="maxInclusive">50.1</param>

            <message key="error.percentage"></message>

        </field-validator>

    </field>

  • minInclusive|minExclusive:指定字段的最小值,包含该值|不包含该值。
  • maxInclusive|maxExclusive:指定字段的最大值, 包含该值|不包含该值。

4、邮件地址校验器:

1)非字段校验:

    <validator type="email">

        <param name="fieldName">MyEmail</param>

        <message>非法的邮件地址</message>

    </validator>

2)字段校验:

    <field name="MyEmail">

        <field-validator type="email">

           <message>非法的邮件地址</message>

        </field-validator>

    </field>

 

5、表达式校验器:

    <validator type="expression">

        <param name="expression">.......</param>

        <message>Failed to meet Ognl Expression...</message>

    </validator>

  • expression:该参数为一个逻辑表达式,该参数使用OGNL表达式,并基于值栈计算,返回一个Boolean类型值。

6、字段表达式校验器:

1)非字段校验:

    <validator type="fieldexpression">

        <param name="fieldName">myField</param>

        <param name="expression"><![CDATA[#myCreditLimit > #myGirfriendCreditLimit]]></param>

        <message>My credit limit should be MORE than my girlfriend</message>

    </validator>

2)字段校验:

    <field name="myField">

        <field-validator type="fieldexpression">

            <param name="expression"><![CDATA[#myCreditLimit > #myGirfriendCreditLimit]]></param>

            <message>My credit limit should be MORE than my girlfriend</message>

        </field-validator>

    </field>

 

7、整数校验器:

1)非字段校验:

    <validator type="int">

        <param name="fieldName">age</param>

        <param name="min">10</param>

        <param name="max">100</param>

        <message>年龄必须在在${min}${max}之间</message>

    </validator>

2)字段校验:

    <field name="age">

        <field-validator type="int">

            <param name="min">10</param>

            <param name="max">100</param>

            <message>年龄必须在在${min}${max}之间</message>

        </field-validator>

    </field>

 

8、正则表达式校验器:

1)非字段校验:

    <validator type="regex">

        <param name="fieldName">myStrangePostcode</param>

        <param name="expression"><![CDATA[([aAbBcCdD][123][eEfFgG][456])]></param>

    </validator>

2)字段校验:

    <field name="myStrangePostcode">

        <field-validator type="regex">

            <param name="expression"><![CDATA[#myCreditLimit > #myGirfriendCreditLimit]]></param>

            <message>My credit limit should be MORE than my girlfriend</message>

        </field-validator>

    </field>

  • expression:为必选参数,指定匹配有的表达式。
  • caseSensitive:指明进行匹配时,是否区分大小写,为可选参数,默认为true

9、必填校验器:

1)非字段校验:

    <validator type="required">

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

        <message>用户名不能为空</message>

    </validator>

2)字段校验:

    <field name="username">

        <field-validator type="required">

            <message>用户名不能为空</message>

        </field-validator>

    </field>

 

10、必填字符串校验器:

1)非字段校验:

    <validator type="requiredstring">

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

        <param name="trim">true</param>

        <message>用户名不能为空</message>

    </validator>

2)字段校验:

    <field name="username">

        <field-validator type="requiredstring">

            <param name="trim">true</param>

            <message>用户名不能为空</message>

        </field-validator>

    </field>

  • trim:可选参数,用于指定是否在校验之前对字符串进行整理,默许为true

11、字符串长度校验器:

1)非字段校验:

    <validator type="stringlength">

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

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

        <param name="maxLength">10</param>

        <message>用户名长度在${minLength}${maxLength}之间</message>

    </validator>

2)字段校验:

    <field name="username">

        <field-validator type="stringlength">

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

            <param name="maxLength">10</param>

            <param name="trim">true</param>

            <message key="error.length.username"></message>

        </field-validator>

    </field>

 

12、网址校验器:

1)非字段校验:

    <validator type="url">

        <param name="fieldName">myHomePage</param>

        <message>Invalid homepage url</message>

    </validator>

2)字段校验:

    <field name="myHomePage">

        <field-validator type="url">

            <message>Invalid homepage url</message>

        </field-validator>

    </field>

 

13visitor校验器:

该校验器名称为:visitor,用来校验Action中定义的复合类型属性,支持简单的复合类型、数组类型、Map等集合类型。

1)非字段校验:

    <validator type="visitor">

        <param name="fieldName">user</param>

        <param name="context">myContext</param>

        <param name="appendPrefix">true</param>

    </validator>

2)字段校验:

    <field name="user">

        <field-validator type="visitor">

            <param name="context">myContext</param>

            <param name="appendPrefix">true</param>

        </field-validator>

    </field>

 

如果想自定义一个自己的校验器,可以在Web工程的WEB-LIB\lib目录下增加一个validators.xml配置文件,在该文件中定义自己的校验器。

 

注意:如果使用validators.xml配置文件,则系统默认的default.xml配置文件不会加载,所以需要将default.xml的内容复制到validators.xml配置文件中。否则不能使用系统内建的校验器。 

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