<action name="toExcel" class="boss-action" method="toExcel">
<result name="excel" type="stream">
<param name="contentType">application/vnd.ms-excel</param>
<param name="inputName">excelStream</param>
<param name="contentDisposition">filename="export.xls"</param>
<param name="bufferSize">1024</param>
</result>
</action>

jar全了没
1.所需jar包
struts2需要jar包：commons-logging.jar、freemarker-2.3.8.jar、ognl-2.6.11.jar、struts2-core-2.0.11.1.jar、xwork-2.0.4.jar
excel导出：jxl.jar
struts.xml;
3.<struts>   
4.    <package name="platform-default" extends="struts-default">   
5.        <action name="excel" class="action.ExcelAction">   
6.            <result name="excel" type="stream">   
7.                <param name="contentType">   
8.                    application/vnd.ms-excel   
9.                </param>   
10.                <param name="inputName">excelStream</param>   
11.                <param name="contentDisposition">   
12.                    filename="export.xls"  
13.                </param>   
14.                <param name="bufferSize">1024</param>   
15.            </result>   
16.        </action>   
17.    </package>   
18.</struts>

------解决方案--------------------

导出excel不用那么麻烦配置，直接在action中写一个方法就可以实现这个功能
代码：
public String action_executeExcel(){
		try{
		
			List<JWJX_JXdajbxx> list = teachDossierService.findAll();
			getDmWjlxdmAll();
			getDmBgqxAll();
			
			//设置导出头部
			HttpServletResponse response = ServletActionContext.getResponse();
			response.reset();
			response.setContentType("application/vnd.ms-excel");
			String fileName = java.net.URLEncoder.encode("教学档案.xls", "UTF-8");
			response.setHeader("Content-Disposition", "attachment; filename="
				+ new String(fileName.getBytes("UTF-8"), "GBK"));
			//组装Excel
			OutputStream os = response.getOutputStream();
			WritableWorkbook book = Workbook.createWorkbook(os);
			WritableSheet sheet = book.createSheet("教学档案", 0);
			String titles[] = new String[] { "分类编号", "文件类型", "文件名称","归档范围","保管期限"};
			
			String properties[] = new String[] { "flbh", "wjlx", "wjmc","gdfw", "bgqx"};
			
			for (int i = 0; i < titles.length; i++) {
				sheet.addCell(new Label(i, 0, titles[i]));
			}
			if(list != null && list.size()>0){
				Iterator i = list.iterator();
				int line = 1;
				while (i.hasNext()) {
					JWJX_JXdajbxx tsc = (JWJX_JXdajbxx) i.next();
					for (int j = 0; j < properties.length; j++) {
						Object value = PropertyUtils.getSimpleProperty(tsc,properti