Struts使用Validator

Struts使用Validator

Validator框架是一种可插拔的系统，validator-rules.xml文件用于以声明的方式插入执行验证时validator将要使用的验证例程。

启用Validator插件

struts-config.xml文件里加入

<!-- =================================================== Validator plugin -->

<plug-in className="org.apache.struts.validator.ValidatorPlugIn">

<set-property

property="pathnames"

value="/WEB-INF/config/validator-rules.xml,/WEB-INF/config/validation.xml"/>

</plug-in>

配置validator-rules.xml

<form-validation>

<global>

<validator name="required"

classname="org.apache.struts.validator.FieldChecks"

method="validateRequired"

methodParams="java.lang.Object,

org.apache.commons.validator.ValidatorAction,

org.apache.commons.validator.Field,

org.apache.struts.action.ActionMessages,

javax.servlet.http.HttpServletRequest"

msg="errors.required"/>

<validator name="mask"

classname="org.apache.struts.validator.FieldChecks"

method="validateMask"

methodParams="java.lang.Object,

org.apache.commons.validator.ValidatorAction,

org.apache.commons.validator.Field,

org.apache.struts.action.ActionMessages,

javax.servlet.http.HttpServletRequest"

depends=""

msg="errors.invalid"/>

</global>

</form-validation>

创建FormBean

要使用Validator，应用程序的Form Bean必须是Validator的ActionFormde的子类而不是使用ActionForm类本身。

/*

* Created on 2005/06/18

*

* TODO To change the template for this generated file go to

* Window - Preferences - Java - Code Style - Code Templates

*/

package com.nova.colimas.web.form;

import org.apache.struts.validator.ValidatorForm;

/**

* @author tyrone

*

* TODO To change the template for this generated type comment go to

* Window - Preferences - Java - Code Style - Code Templates

*/

public class LoginForm extends ValidatorForm {

private String password;

private String userID;

public void Reset() {

this.password="";

this.userID="";

return;

}

/**

* @return Returns the UserID.

*/

public String getUserID() {

return userID;

}

/**

* @param UserID The UserID to set.

*/

public void setUserID(String property1) {

this.userID = property1;

}

/**

* @return Returns the Password.

*/

public String getPassword() {

return password;

}

/**

* @param Password The Password to set.

*/

public void setPassword(String property1) {

this.password = property1;

}

}

struts-config.xml里声明FormBean

<!--2 Login formbean-->

<form-bean

name="LoginForm"

type="com.nova.colimas.web.form.LoginForm"/>

配置validator.xml文件

<?xml version="1.0" encoding="ISO-8859-1" ?>

<!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>

<!--

This is a minimal Validator form file with a couple of examples.

-->

<formset>

<form name="LoginForm">

<field

property="userID"

depends="required">

<arg0 key="LoginForm.userid"/>

</field>

<field

property="password"

depends="required,mask">

<arg0 key="LoginForm.password"/>

<var>

<var-name>mask</var-name>

<var-value>^[0-9a-zA-Z]*$</var-value>

</var>

</field>

</form>

</formset>

</form-validation>

配置资源文件

struts-config.xml

<message-resources parameter="resources.config.index" />

index.properties

#error

errors.invalid={0} is invalid.

errors.required={0} is required.

#key

LoginForm.userid=User ID

LoginForm.password=Password

启动验证Index.jsp

<html:form action="/LoginAction.do">

<p><span class="style15"><bean:message key="index.jsp.userid" /></span><input

type="text" name="userID/><br>

<span class="style15"><bean:message key="index.jsp.pass" /></span><input type="password" name="password"/><br>

<html:submit>

<bean:message key="index.jsp.login" />

</html:submit></p>

<html:errors />

</html:form>

验证出错后，返回action的input属性值的页面，错误显示在<html:errors />位置。

例如struts-config.xml如下，则会显示在"/pages/index.jsp"

<action path="/LoginAction"

type="com.nova.colimas.web.action.LoginAction"

name="LoginForm"

scope="session"

input="/pages/index.jsp"

validate="true">

<