1 public HttpServletResponse download(String path, HttpServletResponse response) { 2 try { 3 // path是指欲下载的文件的路径。 4 File file = new File(path); 5 // 取得文件名。 6 String filename = file.getName(); 7 // 取得文件的后缀名。 8 String ext = filename.substring(filename.lastIndexOf(".") + 1).toUpperCase(); 9 10 // 以流的形式下载文件。 11 InputStream fis = new BufferedInputStream(new FileInputStream(path)); 12 byte[] buffer = new byte[fis.available()]; 13 fis.read(buffer); 14 fis.close(); 15 // 清空response 16 response.reset(); 17 // 设置response的Header 18 response.addHeader("Content-Disposition", "attachment;filename=" + new String(filename.getBytes())); 19 response.addHeader("Content-Length", "" + file.length()); 20 OutputStream toClient = new BufferedOutputStream(response.getOutputStream()); 21 response.setContentType("application/octet-stream"); 22 toClient.write(buffer); 23 toClient.flush(); 24 toClient.close(); 25 } catch (IOException ex) { 26 ex.printStackTrace(); 27 } 28 return response; 29 } 30 31 public void downloadLocal(HttpServletResponse response) throws FileNotFoundException { 32 // 下载本地文件 33 String fileName = "Operator.doc".toString(); // 文件的默认保存名 34 // 读到流中 35 InputStream inStream = new FileInputStream("c:/Operator.doc");// 文件的存放路径 36 // 设置输出的格式 37 response.reset(); 38 response.setContentType("bin"); 39 response.addHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\""); 40 // 循环取出流中的数据 41 byte[] b = new byte[100]; 42 int len; 43 try { 44 while ((len = inStream.read(b)) > 0) 45 response.getOutputStream().write(b, 0, len); 46 inStream.close(); 47 } catch (IOException e) { 48 e.printStackTrace(); 49 } 50 } 51 52 public void downloadNet(HttpServletResponse response) throws MalformedURLException { 53 // 下载网络文件 54 int bytesum = 0; 55 int byteread = 0; 56 57 URL url = new URL("windine.blogdriver.com/logo.gif"); 58 59 try { 60 URLConnection conn = url.openConnection(); 61 InputStream inStream = conn.getInputStream(); 62 FileOutputStream fs = new FileOutputStream("c:/abc.gif"); 63 64 byte[] buffer = new byte[1204]; 65 int length; 66 while ((byteread = inStream.read(buffer)) != -1) { 67 bytesum += byteread; 68 System.out.println(bytesum); 69 fs.write(buffer, 0, byteread); 70 } 71 } catch (FileNotFoundException e) { 72 e.printStackTrace(); 73 } catch (IOException e) { 74 e.printStackTrace(); 75 } 76 }
程序员的基础教程：菜鸟程序员
