* <td class='confluenceTd'>yes * <td class='confluenceTd'>  * <td class='confluenceTd'>field error message * </tr> * <tr> * <td class='confluenceTd'>key * <td class='confluenceTd'>no * <td class='confluenceTd'>  * <td class='confluenceTd'>i18n key from language specific properties file. * </tr> * <tr> * <td class='confluenceTd'>fieldName * <td class='confluenceTd'>no * <td class='confluenceTd'>  * <td class='confluenceTd'>  * </tr> * <tr> * <td class='confluenceTd'>shortCircuit * <td class='confluenceTd'>no * <td class='confluenceTd'>false * <td class='confluenceTd'>If this validator should be used as shortCircuit. * </tr> * <tr> * <td class='confluenceTd'>type * <td class='confluenceTd'>yes * <td class='confluenceTd'>ValidatorType.FIELD * <td class='confluenceTd'>Enum value from ValidatorType. Either FIELD or SIMPLE can be used here. * </tr> * <tr> * <td class='confluenceTd'> trim * <td class='confluenceTd'> no * <td class='confluenceTd'> true * <td class='confluenceTd'> Boolean property. Determines whether the String is trimmed before performing the length check. * </tr> * <tr> * <td class='confluenceTd'> minLength * <td class='confluenceTd'> no * <td class='confluenceTd'>  * <td class='confluenceTd'> Integer property. The minimum length the String must be. * </tr> * <tr> * <td class='confluenceTd'> maxLength * <td class='confluenceTd'> no * <td class='confluenceTd'>  * <td class='confluenceTd'> Integer property. The maximum length the String can be. * </tr> * </table> * * <p>If neither minLength nor maxLength is set, nothing will be done.

* * <!-- END SNIPPET: parameters --> * * <p/> Example code: * * <pre> * <!-- START SNIPPET: example --> * @StringLengthFieldValidator(message = "Default message", key = "i18n.key", shortCircuit = true, trim = true, minLength = "5", maxLength = "12") * <!-- END SNIPPET: example --> * </pre> * * @author Rainer Hermanns * @version $Id: StringLengthFieldValidator.java 894090 2009-12-27 18:18:29Z martinc $ */ @Target({ElementType.METHOD}) @Retention(RetentionPolicy.RUNTIME) public @interface StringLengthFieldValidator { /** * Boolean property. Determines whether the String is trimmed before performing the length check. */ boolean trim() default true; /** * Integer property. The minimum length the String must be. */ String minLength() default ""; /** * Integer property. The maximum length the String can be. */ String maxLength() default ""; /** * The default error message for this validator. * NOTE: It is required to set a message, if you are not using the message key for 18n lookup! */ String message() default ""; /** * The message key to lookup for i18n. */ String key() default ""; /** * The optional fieldName for SIMPLE validator types. */ String fieldName() default ""; /** * If this is activated, the validator will be used as short-circuit. * * Adds the short-circuit="true" attribute value if <tt>true. * */ boolean shortCircuit() default false; /** * The validation type for this field/method. */ ValidatorType[] type() default {ValidatorType.FIELD}; }

Struts example source code file (StringLengthFieldValidator.java) This example Struts source code file (StringLengthFieldValidator.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM. Java - Struts tags/keywords annotation, string, string, stringlengthfieldvalidator, stringlengthfieldvalidator, target, target, validatortype, validatortype The Struts StringLengthFieldValidator.java source code /* * Copyright 2002-2006,2009 The Apache Software Foundation. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.opensymphony.xwork2.validator.annotations; import java.lang.annotation.ElementType; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; import java.lang.annotation.Target; /** * <!-- START SNIPPET: description --> * This validator checks that a String field is of the right length. It assumes that the field is a String. * If neither minLength nor maxLength is set, nothing will be done. * <!-- END SNIPPET: description --> * * <p/> Annotation usage: * * <!-- START SNIPPET: usage --> * <p/>The annotation must be applied at method level. * <!-- END SNIPPET: usage --> * * <p/> Annotation parameters: * * <!-- START SNIPPET: parameters --> * <table class='confluenceTable'> * <tr> * <th class='confluenceTh'> Parameter * <th class='confluenceTh'> Required * <th class='confluenceTh'> Default * <th class='confluenceTh'> Notes * </tr> * <tr> * <td class='confluenceTd'>message

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