Struts之validation.xml验证文件的配置

validation.xml文件的文档结构是由validator_1_1_3.dtd文件定义，其文件头部内容如下：

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE form-validation PUBLIC

          "-//Apache Software Foundation//DTD Commons Validator Rules Configuration 1.1.3//EN"

          "http://jakarta.apache.org/commons/dtds/validator_1_1_3.dtd">

       其顶层元素为：<form-validation>，它包含<formset>和<global>子元素。一般只需要定义<formset>元素，<formset>元素定义格式如下：

<formset>

<constant></constant>

<form></form>

</formset>

       其中<constant />为可选子元素，而<form />子元素至少需要出现一次。<form />子元素的定义格式如下：

<form name="">

<field property=""></field>

..............

<field property="" depends=""  page=""  indexedListProperty=""></field>

</form>

       其中属性描述如下：

l         name：指定了表单的名字与配置文件中的form-bean的name相同；

l          field：对应表单中验证的字段；

l          property：对应ActionForm的属性；

l          depends：指定验证规则，例如：required、maxlength等；

l          page：ActionForm若是跨页表单，则与表单中的page属性对应。
2. <field>子元素配置举例

2.1 必填（或非空）验证

       非空验证的depends属性值为required，配置举例如下：

<form name="UserForm">

         <field property="loginName" depends="required">

                   <arg0 key="UserForm.loginName" />

         </field>

         <field property="name" depends="required">

                   <arg0 key="UserForm.name" />

         </field>

         <field property="password" depends="required">

                   <arg0 key="UserForm.password" />

         </field>

</form>

其中<arg0 key="UserForm.password" />中的key跟资源文件中的键对应。

注意：为了使默认的验证产生正确的信息，开发人员还需要在资源文件中添加errors.required等默认的错误信息，具体操作时，开发人员可在简体中文的资源文件：ApplicationResources_zh_CN.properties.bak中添加如下信息：

errors.required = {0}不能为空

errors.maxlength = {0}长度不能大于{1}个字符

errors. minlength = {0}长度不能小于{1}个字符

errors.short = {0}必须是一个整数

errors.integer = {0}必须是一个整数

errors.long={0}必须是一个整数

errors.float={0}必须是一个浮点数

errors.double ={0}必须是一个双精度型

errors.date={0}必须是一个日期

errors.range = {0}必须是 {1} 到 {2}之间的整数

errors.creditcard={0}必须是一个有效的信用卡号码

errors.email = {0}是无效e-mail地址

在英文资源文件ApplicaitonResources.properties中添加如下内容：

errors.required={0} is required.

errors.minlength={0} can not be less than {1} characters.

errors.maxlength={0} can not be greater than {1} characters.

errors.invalid={0} is invalid.

       

errors.byte={0} must be a byte.

errors.short={0} must be a short.

errors.integer={0} must be an integer.

errors.long={0} must be a long.

errors.float={0} must be a float.

errors.double={0} must be a double.

       

errors.date={0} is not a date.

errors.range={0} is not in the range {1} through {2}.

errors.creditcard={0} is an invalid credit card number.

errors.email={0} is an invalid e-mail address.

2.2 最大长度和最小长度验证

       可在<field>元素的depends属性中添加maxlength和minlength来限制对于那个字段的最大长度和最小长度，使用举例如下：

<field property="password" depends = "required, maxlength, minlength">

<arg0 key = "UserForm.password"/>

<var>

<var-name>maxlength</var-name>

<var-value>12</var-value>

</var>

<var>

<var-name>minlength</var-name>

<var-value>6</var-value>

</var>

</field>

2.3 Email验证

       在Struts中还可以添加email验证，此时depends为email，使用举例如下：

<field property="email" depends="required, email">

<arg0 key="UserForm.email" />

</field>

2.4 日期验证

       在Struts中还可以添加日期验证，此时depends为date，使用举例如下：

<field property="begintime" depends="date">

<arg0 key="HistoryForm.begintime" />

</field>

2.5 整数范围验证

       在Struts中还提供了验证整数是否在某个范围之间，例如下述的例子验证整数是否在1到9999之间，配置如下：

<field property="score" depends="intRange">

<arg0 key="TestForm.score" />

<arg1 name="intRange" key="${var:min}" resource="false" />

<var>

<var-name>min</var-name>

<var-value>1</var-value>

</var>

<arg2 name="intRange" key="${var:max}" resource="false" />

<var>

<var-name>max</var-name>

<var-value>99999</var-value>

</var>

</field>

2.6 自定义验证

在Struts中的验证机制提供了扩展，开发人员可以添加自定义的验证规则，例如可添加文件类型的验证。此时需要编写的Java类、在validator-rules.xml添加该验证规则以及添加验证的js。

自定义验证的Java类CustomValidator的代码如下所示：

package com.amigo.struts.validation;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.validator.Field;

import org.apache.commons.validator.GenericValidator;

import org.apache.commons.validator.Validator;

import org.apache.commons.validator.ValidatorAction;

import org.apache.commons.validator.util.ValidatorUtils;

import org.apache.struts.action.ActionMessages;

import org.apache.struts.validator.Resources;

/**

* Struts自定义验证类.

*/

public class CustomValidator {

       

         /**

          * 判断文件类型

          */

         public static boolean validateFileType(Object bean, ValidatorAction va,

                            Field field, ActionMessages errors, Validator validator,

                            HttpServletRequest request) {

                   String value = ValidatorUtils.getValueAsString(bean, field

                                     .getProperty());

                   String inputType = value.substring(value.lastIndexOf('.'));

                   String type[] = field.getVarValue("fileTypeProperty").split(";");

                   if (!GenericValidator.isBlankOrNull(value)) {

                            try {

                                     boolean judge = false;

                                     for (int i = 0; i < type.length; i++) {

                                               Pattern p = Pattern.compile(type[i],

                                                                 Pattern.CASE_INSENSITIVE);

                                               Matcher m = p.matcher(inputType);

                                               judge = m.matches();

                                               if (judge) {

                                                        break;

                                               }

                                     }

                                   

                                     if (!judge) {

                                               errors.add(field.getKey(), Resources.getActionMessage(

                                                                 validator, request, va, field));

                                               return false;

                                     }

                            } catch (Exception e) {

                                     errors.add(field.getKey(), Resources.getActionMessage(

                                                        validator, request, va, field));

                                     return false;

                            }

                   }

                   return true;

         }

}

       接着还需要在validator-rules.xml这个验证规则文件中添加如下内容：

<!-- 判断文件类型-->

<validator name="fileType" classname="com.cotel.comm.EarlyValidator" method="validateFileType"

                            methodParams="java.lang.Object,

                       org.apache.commons.validator.ValidatorAction,

                       org.apache.commons.validator.Field,

                       org.apache.struts.action.ActionMessages,

                       org.apache.commons.validator.Validator,

                       javax.servlet.http.HttpServletRequest"

                            msg="errors.fileType">

                            <javascript>

                                     <![CDATA[

function validateFileType(form) {

        var isValid = true;

        var focusField = null;

        var i = 0;

        var fields = new Array();

        var formName = form.getAttributeNode("name");

                 

       oFileType = eval('new ' + formName.value + '_fileType()');

      

     

    

        for (x in oFileType) {

            var field = form[oFileType[x][0]];

                          

          

            if ((field.type == 'hidden' ||

                field.type == 'text' ||

                field.type == 'file' ||

                field.type == 'textarea') &&

                field.disabled == false) {

                          

             var iMax =oFileType[x][2]("fileTypeProperty").split(";");

             var index = field.value.lastIndexOf(".");

          var length = field.value.length;

                  var fileType= field.value.substring(index, length);

                  var judege=false;

               

                 if(length>0 && fileType!=""){

         for (var j = 0; j < iMax.length; j++) {

            if (iMax[j].toLowerCase() == fileType.toLowerCase()) {

                judege = true;

                break;

            }

                  }

               

            if (!judege) {

            if (i == 0) {

                        focusField = field;

                    }

         

                    fields[i++] = oFileType[x][1];

                    isValid = false;

                }

                }

            }

        }

        if (fields.length > 0) {

           focusField.focus();

           alert(fields.join('"n'));

        }

        return isValid;

    }

    ]]>

                            </javascript>

                   </validator>

              利用上面这个自定义的验证可以验证文件的类型，在下面的例子中验证文件的类型是否为jpg的，举例如下：

<field property="picPath" depends="required,fileType">

         <arg0 key="TestForm.picPath" />

         <var>

                   <var-name>fileTypeProperty</var-name>

                   <var-value>.jpg</var-value>

         </var>

</field>
3.  完整配置实例

       本小节举一个validation.xml配置的完整例子，本例汇总，对两个表单添加了验证规则。内容如下：

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE form-validation PUBLIC

          "-//Apache Software Foundation//DTD Commons Validator Rules Configuration 1.1.3//EN"

          "http://jakarta.apache.org/commons/dtds/validator_1_1_3.dtd">

<form-validation>

         <formset>

                   <form name="UserinfoForm">

                            <field property="email" depends="email">

                                     <arg0 key="UserinfoForm.email" />

                            </field>

                            <field property="mobile" depends="required">

                                     <arg0 key="UserinfoForm.mobile" />

                            </field>

                            <field property="description" depends="maxlength">

                                     <arg0 key="UserinfoForm.description" />

                                     <arg1 name="maxlength" key="${var:maxlength}" resource="false" />

                                     <var>

                                               <var-name>maxlength</var-name>

                                               <var-value>200</var-value>

                                     </var>

                            </field>

                   </form>

                   <form name="PasswordForm">

                            <field property="newPass" depends="required">

                                     <arg0 key="PasswordForm.newPass" />

                            </field>

                            <field property="oldPass" depends="required">

                                     <arg0 key="PasswordForm.oldPass" />

                            </field>

                            <field property="conPass" depends="required">

                                     <arg0 key="PasswordForm.conPass" />

                            </field>

                   </form>

         </formset>

</form-validation>

我想问一下，要用validator验证的时候要在struts-config.xml文件里先配置<plug-in className="org.apache.struts.validator.ValidatorPlugIn">
<set-property property="pathnames"
value="/WEB-INF/validator-rules.xml,
/WEB-INF/validation.xml" />
</plug-in>
对吧，就这一点我有疑问，我的项目对每个模块都新建了配置文件，比如：struts-config-user.xml，那么plug-in我写在哪一个xml文件中才能有效配置validator,我分别在总的struts-config.xml和单独的struts-config-user.xml中都有引入plug-in但就是没用啊，服务器启动时，没有显示读取相应的validator-rule.xml以及validation.xml文件的信息。第一次用validator做验证，问的有点小白，望指导下，谢谢