使用struts2-codebehind插件下载附件注解示例
使用struts2-codebehind-plugin-2.1.2.jar插件下载Excel附件注解示例

import org.apache.struts2.config.Result;import org.apache.struts2.config.Results;import org.apache.struts2.dispatcher.StreamResult;@Results({ @Result(name = FileDownloadAction.RESULT_EXCEL, value = "stream", type = StreamResult.class, params = { "contentType","application/vnd.ms-excel", "inputName", "stream","contentDisposition", "attachment;filename=\"file2.xls\"","bufferSize", "1024" }) })public class FileDownloadAction {        public static final String RESULT_EXCEL = "excel";        private InputStream stream;        public String execute() throws Exception {               stream = new FileInputStream("c:\\temp\\file.xls");                    return RESULT_EXCEL;                   }               //... getter and setter}

这里最重要的是Result里面params的写法，params后面的大括号中，奇数个字符串是key值，偶数个字符串是value值。
其中，inputName的值－stream要和Class中的InputStream的属性名一致，而Result中的value的值也要与之一致。