在我的jsp页面head标签中无意中加入一句<s:head/>代码，发布部署以后一个页面的labe 字段全部都变成了红色。刚开始找了半天不知道什么原因影响了我页面的css，最后firebug跟踪发现，原来在head中多了一个我没有link的css:
struts/xhtml/styles.css
/*
2 * $Id: styles.css 722375 2008-12-02 05:19:57Z wesw $
3 *
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22.wwFormTable {}
23.label {font-style:italic; }
24.errorLabel {font-style:italic; color:red; }
25.errorMessage {font-weight:bold; color:red; }
26.checkboxLabel {}
27.checkboxErrorLabel {color:red; }
28.required {color:red;}
29.tdLabel {text-align:right; vertical-align:top; } 最后终于发现这段css自动的引入是用于页面无意中<s:head/>造成的。拿掉这个就ok了。