java中文件下载及文件名乱码问题总结

Java  /  管理员 发布于 8年前   193

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responseresponse.reset();// 设置response的Headerresponse.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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