下载文件的几种方式： 1、流下载 //入参 HttpServletResponse response; //打开文件流 InputStream is = new FileInputStream(path); //设置响应头和下载文件名 response.setCharacterEncoding("utf-8"); response.setContentType("multipart/form-data"); response.setHeader("Content-Disposition", "attachment;fileName=" + fileName); OutputStream os = new response.getOutputStream(); //循环写入输出流 byte[] b = new byte[2048]; int length; while ((length = is.read(b)) > 0) { os.write(b, 0, length); }
//关闭流 os.close(); is.close();
2、下载网络文件 URL url = new URL(urlPath); URLConnection conn = url.openConnection(); InputStream inStream = conn.getInputStream(); //本地保存路径 FileOutputStream fs = new FileOutputStream(localPath); //循环写入输出流 byte[] b = new byte[2048]; int length; while ((length = inStream.read(b)) > 0) { fs.write(b, 0, length); } fs.close(); inStream.close(); 3、在线打开和下载 File file = new File(filePath); BufferedInputStream br = new BufferedInputStream(new FileInputStream(file));
URL u = new URL("file:///" + filePath); response.setContentType(u.openConnection().getContentType()); response.setHeader("Content-Disposition", "inline; filename=" + file.getName()); OutputStream os = new response.getOutputStream(); //循环写入输出流 byte[] b = new byte[2048]; int length; while ((length = br.read(b)) > 0) { os.write(b, 0, length); } //关闭流 os.close(); br.close();
