08-01
28

struts validatior实现、问题及解决办法总结

在register模块中加入validator,没想到这个本以为简单的玩意,竟然出现问题,而且几经挫折,才搞好。估计大家也会遇到类似的问题,故总结一下遇到的问题及自己的解决办法。

先谈大致的实现过程
1、在web-inf目录下添加validation.xml和validator-rule.xml
validation.xml文件如下:
<form-validation>
    <global>
        <constant>
            <constant-name>name_common</constant-name>
            <constant-value>^[0-9a-zA-Z]*$</constant-value>
        </constant>
    </global>    

    <formset>
      <form name="registerForm">
        <field property="username" depends="required,mask,maxlength">
            <arg0 key="username" resource="false" />
            <arg1 name="maxlength" key="${var:maxlength}" resource="false" />
            <var>
                <var-name>mask</var-name>
                <var-value>${name_common}</var-value>
            </var>
            <var>
                <var-name>maxlength</var-name>
                <var-value>30</var-value>
            </var>
        </field>

        <field property="password" depends="required,mask,maxlength">
            <arg0 key="password" resource="false" />
            <arg1 name="maxlength" key="${var:maxlength}" resource="false" />
            <var>
                <var-name>mask</var-name>
                <var-value>${name_common}</var-value>
            </var>
            <var>
                <var-name>maxlength</var-name>
                <var-value>30</var-value>
            </var>
        </field>        
      </form>
    </formset>
</form-validation>

validator-rule.xml文件去网上下一个就可以了。

2、修改struts-config.xml,在最后面加入plug-in
    <plug-in className="org.apache.struts.validator.ValidatorPlugIn">
      <set-property property="pathnames"
              value="/WEB-INF/validator-rules.xml,/WEB-INF/validation.xml"/>
      <set-property property="stopOnFirstError" value="false"/>
    </plug-in>

3、修改struts-config.xml中的form-bean registerForm的type为org.apache.struts.validator.DynaValidatorForm
    <form-beans>
       <form-bean name="userInfoForm" type="forms.UserInfoForm"/>
       <form-bean name="registerForm" type="forms.RegisterForm">
       </form-bean>
    </form-beans>
修改为
    <form-beans>
       <form-bean name="userInfoForm" type="forms.UserInfoForm"/>
       <form-bean name="registerForm" type="org.apache.struts.validator.DynaValidatorForm">
           <form-property name="username" type="java.lang.String"/>
           <form-property name="password" type="java.lang.String"/>
           <form-property name="email"    type="java.lang.String"/>
           <form-property name="question" type="java.lang.String"/>
           <form-property name="answer"   type="java.lang.String"/>
       </form-bean>
    </form-beans>
4、修改aCTion的validate参数为true
       <action attribute="registerForm"
               path="/register"
               input="/register.jsp"
               type="org.springframework.web.struts.DelegatingActionProxy"
               name="registerForm"
               scope="session"
               validate="true">
           <forward name="success" path="/success.html"/>
       </action>  

5、修改registerForm.java
原来
public class RegisterForm extends ActionForm
修改为
public class RegisterForm extends DynaValidatorForm
  



再总结问题及解决办法

1、问题1——Document root element "form-validation", must match DOCTYPE root "null"
2007-12-1 15:15:11 org.apache.commons.digester.Digester error
严重: Parse Error at line 39 column 17: Document root element "form-validation", must match DOCTYPE root "null".
org.xml.sax.SAXParseException: Document root element "form-validation", must match DOCTYPE root "null".
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source)

原因: web-inf下的validation.xml文件头部没有文档说明,就是下面这一段:


<!DOCTYPE form-validation PUBLIC
          "-//Apache Software Foundation//DTD Commons Validator Rules Configuration 1.0//EN"
          http://jakarta.apache.org/commons/dtds/validator_1_1_3.dtd>

加上这一段就可以解决这个问题。
我使用的是struts-2.0.11,这里的validator_1_0.dtd可以在strut的lib目录下commons-validator-1.3.0.jar中找到,将commons-validator-1.3.0.jar解压缩,commons-validator-1.3.0\org\apache\commons\validator\resources中可以找到strut支持的所有dtd的版本号。
我这里有如下的版本号:

validator_1_0.dtd
validator_1_0_1.dtd
validator_1_1.dtd
validator_1_1_3.dtd
validator_1_2_0.dtd
validator_1_3_0.dtd

每个版本的dtd有所不同。


2、问题2——The content of element type "field" must match "(msg|arg|var)*".

运行后,eclipse的console中报错:

2007-12-1 15:15:11 org.apache.commons.digester.Digester error
严重: Parse Error at line 39 column 17: Document is invalid: no grammar found.
org.xml.sax.SAXParseException: Document is invalid: no grammar found.
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source)

2007-12-1 15:33:13 org.apache.commons.digester.Digester error
严重: Parse Error at line 18 column 33: Element type "arg0" must be declared.
org.xml.sax.SAXParseException: Element type "arg0" must be declared.
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source)
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.error(Unknown Source)

2007-12-1 15:33:13 org.apache.commons.digester.Digester error
严重: Parse Error at line 28 column 11: The content of element type "field" must match "(msg|arg|var)*".
org.xml.sax.SAXParseException: The content of element type "field" must match "(msg|arg|var)*".
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source)
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.error(Unknown Source)

原因:这3个错误其实是因为一个原因引起的,那就是arg0的问题,不是所有的dtd版本都支持arg0参数。
仔细研究commons-validator-1.3.0\org\apache\commons\validator\resources中下的所有dtd的版本号,会发现,各版本关于filed中参数的定义不同。
在validator_1_1_3.dtd之前的版本中,如下:

<!ELEMENT field (msg|arg|arg0|arg1|arg2|arg3|var)*>
<!ATTLIST field property CDATA #REQUIRED>
<!ATTLIST field depends CDATA #IMPLIED>
<!ATTLIST field page CDATA #IMPLIED>
<!ATTLIST field indexedListProperty CDATA #IMPLIED>

在之后的版本如下:

<!ELEMENT field (msg|arg|var)*>
<!ATTLIST field property CDATA #REQUIRED>
<!ATTLIST field depends CDATA #IMPLIED>
<!ATTLIST field page CDATA #IMPLIED>
<!ATTLIST field indexedListProperty CDATA #IMPLIED>

可见不是所有的dtd版本都支持arg0参数的。
而且仔细阅读validator_1_1_3.dtd发现,里面有关于这个的说明:

Since 1.2.0 position is ignored for ''default'' arguments (i.e. those with no ''name'' supplied) - it is calculated  automatically from the order the arguments are added in.
For ''overriden'' arguments (i.e. those with a ''name'') it is optional. If ''position'' is not supplied it will use the position of the ''default'' argument it follows.

让人奇怪的是:即使采用支持arg0参数的validator_1_1_3.dtd或是之前的版本,仍然报此错误。不知为何。先不管了,将validation.xml中的arg0,arg1统一改为arg。


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回复回复唏嘘一世[2010-06-24 01:16 PM | del]
可能要下载最新的validate
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