String imgUrl="";//圖片地址    try {      // 構造URL      URL url = new URL(imgUrl);      // 打開連接      URLConnection con = url.openConnection();      // 輸入流      InputStream is = con.getInputStream();      // 1K的數據緩沖      byte[] bs = new byte[1024];      // 讀取到的數據長度      int len;      // 輸出的文件流      OutputStream os = new FileOutputStream("c://image.jpg");//保存路徑      // 開始讀取      while ((len = is.read(bs)) != -1) {        os.write(bs, 0, len);      }      // 完畢，關閉所有鏈接      os.close();      is.close();    } catch (MalformedURLException e) {      e.printStackTrace();    } catch (FileNotFoundException e) {      e.printStackTrace();    } catch (IOException e) {      e.printStackTrace();    }

String imgUrl="";//URL地址    String fileName = imgUrl.substring(imgUrl.lastIndexOf('/') + 1);    BufferedInputStream is = null;    BufferedOutputStream os = null;    try {      URL url = new URL(imgUrl);      this.getServletResponse().setContentType("application/x-msdownload;");       this.getServletResponse().setHeader("Content-disposition", "attachment; filename=" + new String(fileName.getBytes("utf-8"), "ISO8859-1"));       this.getServletResponse().setHeader("Content-Length", String.valueOf(url.openConnection().getContentLength()));            is = new BufferedInputStream(url.openStream());      os = new BufferedOutputStream(this.getServletResponse().getOutputStream());       byte[] buff = new byte[2048];       int bytesRead;       while (-1 != (bytesRead = is.read(buff, 0, buff.length))) {         os.write(buff, 0, bytesRead);       }       if (is != null)         is.close();       if (os != null)         os.close();    } catch (MalformedURLException e) {      e.printStackTrace();    } catch (UnsupportedEncodingException e) {      e.printStackTrace();    } catch (IOException e) {      e.printStackTrace();    }