public class DownLoadAction extends ActionSupport { /** * */ private static final long serialVersionUID = 5879762231742395104L; private String fileName;//用戶請求的文件名 private String inputPath;//下載資源的路徑(在struts配置文件中設置) public void setInputPath(String inputPath) { this.inputPath = inputPath; } public String getInputPath() { return inputPath; } public void setFileName(String fileName) { this.fileName = fileName; } public String getFileName() { return fileName; } public String downloadFile() throws Exception { ServletContext context = ServletActionContext.getServletContext(); String downloadDir = context.getRealPath("/upload"); String downloadFile = context.getRealPath(inputPath); //防止用戶請求不安全的資源 if(!downloadFile.startsWith(downloadDir)) { return null; } return "download_success"; } /* * 獲取輸入流資源 */ public InputStream getInputStream() throws Exception { String path = inputPath + File.separatorChar + new String(fileName.getBytes("ISO-8859-1"), "UTF-8"); return ServletActionContext.getServletContext().getResourceAsStream(path); } /* * 獲取下載時文件默認的文件名 */ public String getDownloadFileName() { String downloadFileName = fileName; try { downloadFileName = URLEncoder.encode(downloadFileName, "ISO-8859-1"); } catch (UnsupportedEncodingException e) { e.getMessage(); e.printStackTrace(); } return downloadFileName; } } 

<li> <a href="<%=path%>/download_DownLoadAction_downloadFile.action?fileName=dwr.jar">dwr.jar文件下在</a> </li> <li> <a href="<%=path%>/download_DownLoadAction_downloadFile.action?fileName=Struts2教程.pdf">Struts2教程.pdf文件下在</a> </li> 

<action name="download_*_*" class="com.wang.action.{1}" method="{2}"> <param name="inputPath">/upload</param> <!-- result type設置為stream --> <result name="download_success" type="stream"> <!-- MIME類型 --> <param name="contentType">application/octet-stream</param> <!-- inputName的值與action獲取輸入流資源的方法名相對應(action中定義getInputStream方法,并且返回類型為InputStream) --> <param name="inputName">inputStream</param> <!-- 設置帶附件的文件 動態獲取文件名(action中定義getDownloadFileName方法) --> <param name="contentDisposition">attachment;filename="${downloadFileName}"</param> <!-- 設置緩沖大小 --> <param name="bufferSize">2048</param> </result> </action>