java中文件下载及文件名乱码问题总结

关于java文件下载文件名乱码问题解决方案：（相关学习课程：java视频教程）

String fileName = "下载的文件名"; String userAgent = request.getHeader("User-Agent");  //针对IE或者以IE为内核的浏览器： if (userAgent.contains("MSIE")||userAgent.contains("Trident")) { fileName = java.net.URLEncoder.encode(fileName, "UTF-8"); } else {  //非IE浏览器的处理： fileName = new String(fileName.getBytes("UTF-8"),"ISO-8859-1"); } response.setHeader("Content-disposition", String.format("attachment; filename=\"%s\"", fileName)); response.setContentType("application/vnd.ms-excel;charset=utf-8"); response.setCharacterEncoding("UTF-8");

Java文件下载的几种方式

 public HttpServletResponse download(String path, HttpServletResponse response) {         try {             // path是指欲下载的文件的路径。             File file = new File(path);             // 取得文件名。             String filename = file.getName();             // 取得文件的后缀名。             String ext = filename.substring(filename.lastIndexOf(".") + 1).toUpperCase();              // 以流的形式下载文件。             InputStream fis = new BufferedInputStream(new FileInputStream(path));             byte[] buffer = new byte[fis.available()];             fis.read(buffer);             fis.close();             // 清空response             response.reset();             // 设置response的Header             response.addHeader("Content-Disposition", "attachment;filename=" + new String(filename.getBytes()));             response.addHeader("Content-Length", "" + file.length());             OutputStream toClient = new BufferedOutputStream(response.getOutputStream());             response.setContentType("application/octet-stream");             toClient.write(buffer);             toClient.flush();             toClient.close();         } catch (IOException ex) {             ex.printStackTrace();         }         return response;     }      public void downloadLocal(HttpServletResponse response) throws FileNotFoundException {         // 下载本地文件         String fileName = "Operator.doc".toString(); // 文件的默认保存名         // 读到流中         InputStream inStream = new FileInputStream("c:/Operator.doc");// 文件的存放路径         // 设置输出的格式         response.reset();         response.setContentType("bin");         response.addHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\"");         // 循环取出流中的数据         byte[] b = new byte[100];         int len;         try {             while ((len = inStream.read(b)) > 0)                 response.getOutputStream().write(b, 0, len);             inStream.close();         } catch (IOException e) {             e.printStackTrace();         }     }      public void downloadNet(HttpServletResponse response) throws MalformedURLException {         // 下载网络文件         int bytesum = 0;         int byteread = 0;          URL url = new URL("windine.blogdriver.com/logo.gif");          try {             URLConnection conn = url.openConnection();             InputStream inStream = conn.getInputStream();             FileOutputStream fs = new FileOutputStream("c:/abc.gif");              byte[] buffer = new byte[1204];             int length;             while ((byteread = inStream.read(buffer)) != -1) {                 bytesum += byteread;                 System.out.println(bytesum);                 fs.write(buffer, 0, byteread);             }         } catch (FileNotFoundException e) {             e.printStackTrace();         } catch (IOException e) {             e.printStackTrace();         }     }

支持在线打开文件的一种方式

public void downLoad(String filePath, HttpServletResponse response, boolean isOnLine) throws Exception {         File f = new File(filePath);         if (!f.exists()) {             response.sendError(404, "File not found!");             return;         }         BufferedInputStream br = new BufferedInputStream(new FileInputStream(f));         byte[] buf = new byte[1024];         int len = 0;          response.reset(); // 非常重要         if (isOnLine) { // 在线打开方式             URL u = new URL("file:///" + filePath);             response.setContentType(u.openConnection().getContentType());             response.setHeader("Content-Disposition", "inline; filename=" + f.getName());             // 文件名应该编码成UTF-8         } else { // 纯下载方式             response.setContentType("application/x-msdownload");             response.setHeader("Content-Disposition", "attachment; filename=" + f.getName());         }         OutputStream out = response.getOutputStream();         while ((len = br.read(buf)) > 0)             out.write(buf, 0, len);         br.close();         out.close();     }

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