java文件下载 带有错误提示框 弹出的

"); sb.append(""); sb.append(""); return sb.toString(); } /** * downloadFileByAbsolutePath(文件下载) * @param path 文件的路径(绝对路径E://text.txt) * @param prefixFilename 文件名称 * @param suffFilename 文件名称的后缀 * @param response * @param request */ public void downloadFileByAbsolutePath(String path ,String prefixFilename ,String suffFilename,final HttpServletResponse response ,HttpServletRequest request) { OutputStream out = null; String fileName = prefixFilename+"."+suffFilename; try { out = new BufferedOutputStream(response.getOutputStream()); String filePath =path; String fileName_encode = URLEncoder.encode(fileName, "UTF-8").replaceAll("[+]","%20"); byte[] data = null; try{ data = FileOperate.getBytes(filePath); }catch(FileNotFoundException e2){ response.setCharacterEncoding("UTF-8"); String notFileHtml = FileOperate.getNotFileHtml(fileName,"文件找 不到!"); out.write(notFileHtml.getBytes("UTF-8")); out.flush(); } request.setCharacterEncoding("UTF-8"); response.reset(); if (request.getHeader("User-Agent").toLowerCase().indexOf("msie") > -1){ response.setHeader("Content-Disposition", "attachment; filename=\"" + fileName_encode + "\""); }else{ response.setHeader("content-disposition","attachment;filename*=utf-8'zh_cn'" +fileName_encode); } response.addHeader("Content-Length", "" + data.length); response.setContentType("application/octet-stream;charset=UTF-8"); out.write(data); out.flush(); } catch (Exception e) { String notFileHtml = FileOperate.getNotFileHtml(fileName,"文件下载出错!"); try { response.setCharacterEncoding("UTF-8"); out.write(notFileHtml.getBytes("UTF-8")); out.flush(); } catch (Exception e1) { e1.printStackTrace(); logger.error("文件下载出错"); } } finally { try { if(out != null){ out.close(); } } catch (IOException e) { logger.error("关闭BufferedOutputStream出错"); e.printStackTrace(); } } } /** * downloadFile(文件下载 ，相对项目下的路径) * @param path 文件的路径(相对路径 /docs/abc/test.jpg) * @param filename 文件名称 * @param response * @param request */ public void downloadFile(String path ,String filename,final HttpServletResponse response ,HttpServletRequest request) { String prefixFilename = filename.substring(0,filename.lastIndexOf(".")); String suffFilename = filename.substring(filename.lastIndexOf(".")+1,filename.length()); downloadFile(path, prefixFilename, suffFilename, response, request); } /** * downloadFile(文件下载 ，相对项目下的路径) * @param path 文件的路径(相对路径 /docs/abc/test.jpg) * @param prefixFilename 文件名称 * @param suffFilename 文件名称的后缀 * @param response * @param request */ public void downloadFile(String path ,String prefixFilename ,String suffFilename,final HttpServletResponse response ,HttpServletRequest request) { path = FileOperate.getFileRealPath(path, request.getSession().getServletContext()); downloadFileByAbsolutePath(path, prefixFilename, suffFilename, response, request); } /** * downloadFileByAbsolutePath(文件下载) * @param path 文件的路径(绝对路径E://text.txt) * @param filename 文件名称 * @param response * @param request */ public void downloadFileByAbsolutePath(String path ,String filename,final HttpServletResponse response ,HttpServletRequest request) { String prefixFilename = filename.substring(0,filename.lastIndexOf(".")); String suffFilename = filename.substring(filename.lastIndexOf(".")+1,filename.length()); downloadFileByAbsolutePath(path, prefixFilename, suffFilename, response, request); } /** * 获得指定文件的byte数组 * @throws FileNotFoundException */ public static byte[] getBytes(String filePath) throws FileNotFoundException { byte[] buffer = null; File file = new File(filePath); FileInputStream fis = new FileInputStream(file); ByteArrayOutputStream bos = new ByteArrayOutputStream(1000); byte[] b = new byte[1000]; int n; try{ while ((n = fis.read(b)) != -1) { bos.write(b, 0, n); } }catch(Exception e){ logger.error("文件转换成byte数组出错"); }finally{ try { fis.close(); bos.close(); } catch (IOException e) { e.printStackTrace(); } } buffer = bos.toByteArray(); return buffer; } /** * 获取 文件的 真实路径 * **/ public static String getFileRealPath(String path,ServletContext ctx){ if(getSystemName().equals("linux")){//linux try { path = URLDecoder.decode(path,"UTF-8"); } catch (UnsupportedEncodingException e3) { logger.error("path的编码不支持decode转码"); e3.printStackTrace(); } } String savePath = path; int index = savePath.lastIndexOf("/"); String fileName = savePath.substring(index + 1); fileName = fileName.replaceAll("%20",""); fileName = fileName.replaceAll(" ",""); String rpath = getRealPath(ctx)+ savePath;//服务器上的文件真实路径 return rpath; } //获取不 同系统下的文件真正路径 public static String getRealPath(ServletContext cxt){ String rpath = ""; if(getSystemName().equals("linux")){//linux rpath = File.separator + cxt.getRealPath(File.separator); }else{//windows rpath = cxt.getRealPath(File.separator); } return rpath; } //获取系统名称 public static String getSystemName(){ if(System.getProperty("file.separator").equals("/")){//linux return "linux"; }else{ return "windows"; } }