Struts实现文件下载
1.struts 1
通过struts实现文件下载有两种方式，一种是继承DownloadAction，一种是读取文件流然后output到response里面。
? 1.继承DownloadAction，需要重写getStreamInfo方法，返回StreamInfo，DownloadAction有两个StreamInfo，FileStreamInfo和ResourceStreamInfo。
? 例子:
public ActionForward download(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) { try { String path = new String(rootFolder +request.getParameter("path")); File file = new File(path); String filename = file.getName(); //取得文件的扩展名ext String ext = filename.substring(filename.lastIndexOf(".") + 1).toUpperCase(); InputStream fis = new BufferedInputStream(new FileInputStream(path)); byte[] buffer = new byte[fis.available()]; fis.read(buffer); fis.close(); response.reset(); response.addHeader("Content-Disposition", "attachment;filename="+new String(filename.getBytes())); response.addHeader("Content-Length", ""+file.length()); //设置返回的文件类型 OutputStream toClient = new BufferedOutputStream(response.getOutputStream()); //得到向客户端输出二进制数据的对象 //根据扩展名声称客户端浏览器mime类型 if(ext.equals("DOC")) response.setContentType("application/msword"); else response.setContentType("application/octet-stream"); //设置返回的文件类型 toClient.write(buffer); //输出数据 toClient.flush(); toClient.close(); } catch(IOException ex){ ex.printStackTrace(); } return null; }