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
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