struts2中simple主题下标签默认样式的移除方法

前言

当在我们注册用户时，如果给前台的提示是用户名重复并且用户名太长时，就会要往action里面添加多个errors，这时到前台怎么把它依次拿出来

下面话不多说了，来一起看看详细的介绍吧

方法如下

①找到配置文件

struts2-core-2.3.35.jar/template/simple/fielderror.ftl（不同版本的文件路径大同小异）

②创建新的文件包并拷贝文件

在项目根目录下创建template.simple并将fielderror.ftl拷贝过来

此时根目录下的fielderror.ftl文件优先权大于默认的fielderror.ftl文件

③修改拷贝过来的fielderror.ftl文件

修改前文件如下

<#--
/*
 * $Id$
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you 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.
 */
-->
<#if fieldErrors??><#t/>
 <#assign eKeys = fieldErrors.keySet()><#t/>
 <#assign eKeysSize = eKeys.size()><#t/>
 <#assign doneStartUlTag=false><#t/>
 <#assign doneEndUlTag=false><#t/>
 <#assign haveMatchedErrorField=false><#t/>
 <#if (fieldErrorFieldNames?size > 0) ><#t/>
  <#list fieldErrorFieldNames as fieldErrorFieldName><#t/>
   <#list eKeys as eKey><#t/>
    <#if (eKey = fieldErrorFieldName)><#t/>
     <#assign haveMatchedErrorField=true><#t/>
     <#assign eValue = fieldErrors[fieldErrorFieldName]><#t/>
     <#if (haveMatchedErrorField && (!doneStartUlTag))><#t/>
     
      <#if parameters.id?has_content>
        id="${parameters.id?html}"<#rt/>
      
      <#if parameters.cssClass?has_content>
        class="${parameters.cssClass?html}"<#rt/>
       <#else>
        class="errorMessage"<#rt/>
      
      <#if parameters.cssStyle?has_content>
        style="${parameters.cssStyle?html}"<#rt/>
      
       >
      <#assign doneStartUlTag=true><#t/>
     <#t/>
     <#list eValue as eEachValue><#t/>
      
<#if parameters.escape>${eEachValue!?html}<#else>${eEachValue!}
     <#t/>
    <#t/>
   <#t/>
  <#t/>
  <#if (haveMatchedErrorField && (!doneEndUlTag))><#t/>
  
   <#assign doneEndUlTag=true><#t/>
  <#t/>
  <#else><#t/>
  <#if (eKeysSize > 0)><#t/>
  
   <#if parameters.cssClass?has_content>
     class="${parameters.cssClass?html}"<#rt/>
    <#else>
     class="errorMessage"<#rt/>
   
   <#if parameters.cssStyle?has_content>
     style="${parameters.cssStyle?html}"<#rt/>
   
    >
   <#list eKeys as eKey><#t/>
    <#assign eValue = fieldErrors[eKey]><#t/>
    <#list eValue as eEachValue><#t/>
     
<#if parameters.escape>${eEachValue!?html}<#else>${eEachValue!}
    <#t/>
   <#t/>
  
  <#t/>
 <#t/>
<#t/>

将

、

、删除

修改后文件如下

<#--
/*
 * $Id$
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you 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.
 */
-->
<#if fieldErrors??><#t/>
 <#assign eKeys = fieldErrors.keySet()><#t/>
 <#assign eKeysSize = eKeys.size()><#t/>
 <#assign doneStartUlTag=false><#t/>
 <#assign doneEndUlTag=false><#t/>
 <#assign haveMatchedErrorField=false><#t/>
 <#if (fieldErrorFieldNames?size > 0) ><#t/>
  <#list fieldErrorFieldNames as fieldErrorFieldName><#t/>
   <#list eKeys as eKey><#t/>
    <#if (eKey = fieldErrorFieldName)><#t/>
     <#assign haveMatchedErrorField=true><#t/>
     <#assign eValue = fieldErrors[fieldErrorFieldName]><#t/>
     <#if (haveMatchedErrorField && (!doneStartUlTag))><#t/>
     
      <#assign doneStartUlTag=true><#t/>
     <#t/>
     <#list eValue as eEachValue><#t/>
      <#if parameters.escape>${eEachValue!?html}<#else>${eEachValue!}
     <#t/>
    <#t/>
   <#t/>
  <#t/>
  <#if (haveMatchedErrorField && (!doneEndUlTag))><#t/>
  
   <#assign doneEndUlTag=true><#t/>
  <#t/>
  <#else><#t/>
  <#if (eKeysSize > 0)><#t/>
  
   <#list eKeys as eKey><#t/>
    <#assign eValue = fieldErrors[eKey]><#t/>
    <#list eValue as eEachValue><#t/>
     <#if parameters.escape>${eEachValue!?html}<#else>${eEachValue!}
    <#t/>
   <#t/>
  
  <#t/>
 <#t/>
<#t/>

重启tomcat

总结

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