struts1文件下载

public ActionForward down(ActionMapping mapping, ActionForm form,HttpServletRequest request, HttpServletResponse response)throws Exception {//用户登录 省略//得到传过来的参数//因为是用get方式传过来的，所以要编码String name = new String(request.getParameter("name").getBytes("iso-8859-1"),"utf-8");//服务器上的真实路径String path = request.getSession().getServletContext().getRealPath("/upload");//从服务器上下载,用new FileInputStream//下载用response,因为是要下载到客户端，所以要用response.getOutputStream()InputStream iStream = new FileInputStream(path+File.separator+name);OutputStream oStream = response.getOutputStream();//这句话是设置response的头信息//可以弹出一个对话框用来下载response.addHeader("content-disposition", "attachment;filename="+java.net.URLEncoder.encode(name, "utf-8"));byte[] b = new byte[1024];//一次读多少字节的数据从iStream中int size = iStream.read(b);while (size > 0) {oStream.write(b,0,size);//这里一次写多少size = iStream.read(b);}iStream.close();oStream.close();return null;}