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">

                          <forward name="success" path="/pages/index.jsp"/>

                          <forward name="failure" path="/pages/index.jsp"/>

            </action>