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  • 下载文件几种方式

    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();
    }
    }

    念念不忘必有回响,每天努力多一点,终有一天你会感谢曾经努力的自己
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  • 原文地址:https://www.cnblogs.com/wuruile/p/3239202.html
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