JAVA文件下载（流的形式）

最新推荐文章于 2023-08-31 10:41:44 发布

原创最新推荐文章于 2023-08-31 10:41:44 发布 · 1.9k 阅读

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#JAVA文件下载

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本文提供了一种在Java中实现文件下载的有效方法，通过使用BufferedInputStream和BufferedOutputStream，结合HTTP请求和响应处理，实现了跨平台的文件下载功能。文章详细介绍了如何设置HTTP响应头以确保文件正确下载，并处理了不同字符编码的问题。

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public static void downloadfile(String fileName , String filePath, String fileTye, HttpServletRequest request, HttpServletResponse response){
    response.setContentType("text/html;charset=utf-8");
    fileName = fileName  + fileTye;
    try {
        request.setCharacterEncoding("UTF-8");
    } catch (UnsupportedEncodingException e1) {
        // TODO Auto-generated catch block
        e1.printStackTrace();
    }

    BufferedInputStream bis = null;
    BufferedOutputStream bos = null;
    try {
        String downLoadPath = filePath;  //注意不同系统的分隔符  万能显示符"/"
        downLoadPath =downLoadPath.replaceAll("\\\\", "/");
        long fileLength = new File(downLoadPath).length();
        bis = new BufferedInputStream(new FileInputStream(downLoadPath.trim()));
        bos = new BufferedOutputStream(response.getOutputStream());
        response.setContentType("multipart/form-data");
        response.setHeader("Content-disposition", "attachment; filename=" + new String(fileName.getBytes("utf-8"), "ISO8859-1"));
        byte[] buff = new byte[2048];
        int bytesRead;
        while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
            bos.write(buff, 0, bytesRead);
        }
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        if (bis != null){
            try {
                bis.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        if (bos != null){
            try {
                bos.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }

}