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/>
<ul<#rt/>
<#if parameters.id?has_content>
id="${parameters.id?html}"<#rt/>
</#if>
<#if parameters.cssClass?has_content>
class="${parameters.cssClass?html}"<#rt/>
<#else>
class="errorMessage"<#rt/>
</#if>
<#if parameters.cssStyle?has_content>
style="${parameters.cssStyle?html}"<#rt/>
</#if>
>
<#assign doneStartUlTag=true><#t/>
</#if><#t/>
<#list eValue as eEachValue><#t/>
<li><span><#if parameters.escape>${eEachValue!?html}<#else>${eEachValue!}</#if></span></li>
</#list><#t/>
</#if><#t/>
</#list><#t/>
</#list><#t/>
<#if (haveMatchedErrorField && (!doneEndUlTag))><#t/>
</ul>
<#assign doneEndUlTag=true><#t/>
</#if><#t/>
<#else><#t/>
<#if (eKeysSize > 0)><#t/>
<ul<#rt/>
<#if parameters.cssClass?has_content>
class="${parameters.cssClass?html}"<#rt/>
<#else>
class="errorMessage"<#rt/>
</#if>
<#if parameters.cssStyle?has_content>
style="${parameters.cssStyle?html}"<#rt/>
</#if>
>
<#list eKeys as eKey><#t/>
<#assign eValue = fieldErrors[eKey]><#t/>
<#list eValue as eEachValue><#t/>
<li><span><#if parameters.escape>${eEachValue!?html}<#else>${eEachValue!}</#if></span></li>
</#list><#t/>
</#list><#t/>
</ul>
</#if><#t/>
</#if><#t/>
</#if><#t/>
将<ul></ul>、<li></li>、<span></span>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/>
</#if><#t/>
<#list eValue as eEachValue><#t/>
<#if parameters.escape>${eEachValue!?html}<#else>${eEachValue!}</#if>
</#list><#t/>
</#if><#t/>
</#list><#t/>
</#list><#t/>
<#if (haveMatchedErrorField && (!doneEndUlTag))><#t/>
<#assign doneEndUlTag=true><#t/>
</#if><#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!}</#if>
</#list><#t/>
</#list><#t/>
</#if><#t/>
</#if><#t/>
</#if><#t/>
重启tomcat
总结
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