Struts之自定义Validator

在使用Struts的时候，验证是使用Validator来做，但是有时候需要有自己的验证规则,幸运的是我们可以方便地进行扩展。
比如我们想定义一个规则来判定两次输入的密码是相等的。我们需要这样做，首先我们需要一个类，象这样子 ：

package com.motel168.util;



import java.text.SimpleDateFormat;

import java.util.Date;



import javax.servlet.http.HttpServletRequest;



import org.apache.commons.validator.Field;

import org.apache.commons.validator.GenericValidator;

import org.apache.commons.validator.ValidatorAction;

import org.apache.commons.validator.ValidatorUtil;

import org.apache.struts.action.ActionErrors;

import org.apache.struts.validator.Resources;



public class MyValidator {

    public static boolean validateTwoFields(Object
bean,ValidatorAction va,Field field,ActionErrors
errors,HttpServletRequest request){

        

        String value = ValidatorUtil.getValueAsString(bean,field.getProperty());

        String sProperty2 = field.getVarValue("secondProperty");

        String value2 = ValidatorUtil.getValueAsString(bean,sProperty2);

        if(!GenericValidator.isBlankOrNull(value)){

            try{

                if(!value.equals(value2)){

           
       
errors.add(field.getKey(),Resources.getActionError(request,va,field));

                    return false;

                }

            }catch(Exception e){

           
   
errors.add(field.getKey(),Resources.getActionError(request,va,field));

                return false;

            }

        }

        return true;

    }

    

}

上面这个类就是用来判断两个域是否相等，很简单，但是注意方法名一定要是validateXXX。

接下来需要扩展validator-rules.xml,在之前加入这么一段:

      
  
             
   
 methodParams="java.lang.Object,org.apache.commons.validator.ValidatorAction,org.apache.commons.validator.Field,org.apache.struts.action.ActionErrors,javax.servlet.http.HttpServletRequest"

             
     depends="required" msg="errors.twofield">

      
  
   

      <br />
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; function validateTwoFields(form){<br />
&nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; var bValid = true;<br />
&nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; var focusField = null;<br />
&nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; var i = 0;<br />
&nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; var fields = new Array();<br />
&nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; oTwoFields = new twofields();<br />
&nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; for(x in oTwoFields){<br />
&nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; var field = form[oTwoFields[x][0]];<br />
&nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp; var secondField =
form[oTwoFields[x][2]("secondProperty")];<br />
&nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;
if(field.type=="text"||field.type=="textarea"||field.type=="select-one"||field.type=="radio"||field.type=="password"){<br />
&nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; var value;<br />
&nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; var secondValue;<br />
&nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; if(field.type=="select-one"){<br />
&nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; var si =
field.selectedIndex;<br />
&nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; value =
field.options[si].value;<br />
&nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; secondValue =
secondField.options[si].value;<br />
&nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; }else{<br />
&nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;
value=field.value;<br />
&nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; secondValue =
secondField.value;<br />
&nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; }<br />
&nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; if(value!=secondValue){<br />
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; if(i==0){<br />
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp; focusField = field;<br />
&nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; }<br />
&nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; fields[i++]=oTwoFields[x][1];<br />
&nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; bValid = flase;<br />
&nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; }<br />
&nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; }<br />
&nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp;&nbsp; }<br />
&nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp;&nbsp; if(fiels.length &gt; 0){<br />
&nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; focusFiled.focus();<br />
&nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; alert(fields.join('\n'));<br />
&nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; }<br />
&nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp;&nbsp; return bValid;<br />
&nbsp;&nbsp;&nbsp; &nbsp; <br />
&nbsp;&nbsp;&nbsp; &nbsp; ]]&gt;<br />
&nbsp;&nbsp;&nbsp; &nbsp; </javascript><br />
&nbsp;&nbsp;&nbsp; &nbsp; </validator>&nbsp;&nbsp;&nbsp; <br />
</pre>然后使用的时候就和其他没什么两样的了：<br /><pre class=code>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; <br />
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; <field property="newPassword1" depends="required,twofields"><br />
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; <msg name="required" key="errors.required" /><br />
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp; <msg name="tworfields" key="errors.twofields" /><br />
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; <arg0 key="errors.newpassword1" /><br />
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; <arg1 key="errors.newpassword2" /><br />
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; <var><br />
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;
<var-NAME>secondProperty</VAR-NAME><br />
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;
<var-VALUE>newPassword2</VAR-VALUE><br />
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; </var><br />
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; </field><br />
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; <field property="newPassword2" depends="required"><br />
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; <msg name="required" key="errors.required" /><br />
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; <arg0 key="errors.newpassword2" /><br />
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; </field><br />
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; <br />
<br />
</pre><br />注意这个地方<br /><pre class=code>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; <var><br />
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;
<var-NAME>secondProperty</VAR-NAME><br />
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;
<var-VALUE>newPassword2</VAR-VALUE><br />
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; </var><br />
</pre>就是我们在java类中读取的变量，它代表的是另外的一个域。<br />在JSP中的使用就不再说明了，大功告成:)。<br /><br /><p>本文出自 “<a href='http://442277.blog.51cto.com'>log4deng</a>” 博客，转载请与作者联系！</p>
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