<?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>
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。
2.1 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:
ApplicaitonResources.properties 中添加如下内容:
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
最大长度和最小长度验证
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
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>
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: