Action層：

public String myDownloadFile() {
		HttpServletResponse response = ServletActionContext.getResponse();
		String myFileName = getFilename();	//設定檔名 一般帶有副檔名。是下載後文件的名稱。
		try {
			byte[] buffer = XXXService.readFile(attId); // byte[]  通過id獲取檔案的byte陣列
			// 清空response
			response.reset();
			// 設定response的Header
			response.addHeader("Content-Disposition",
					"attachment;filename=" + new String(myFileName.getBytes("gb2312"), "ISO8859-1"));
			OutputStream toClient = new BufferedOutputStream(response.getOutputStream());
			response.setContentType("application/octet-stream");
			toClient.write(buffer);
			toClient.flush();
			toClient.close();
		} catch (IOException ex) {
			ex.printStackTrace();
		}
		return null;
	}
 

Struts配置檔案：

<action name="myDownloadFile" class="xyz.jangle.base.action.AttachmentAction" method="myDownloadFile">
	    	<result name="success"></result>
</action>

前端html：

<a href="/myDownloadFile.action?attId=fileId">檔名稱.doc</a>