如何下载文件 - 阿甘的博客

// File file = xxx
InputStream inStream = new FileInputStream(file);
try {
    String fileName = file.getName();
    response.setHeader("Content-Disposition", "attachment; filename=" + fileName); // HttpServletResponse
    response.addHeader("Content-Length", "" + inStream.available());
    response.setContentType("application/octet-stream; charset=UTF-8");
    // 后面再来考虑支持断点续传。
    IOUtils.copy(inStream, response.getOutputStream());
} finally {
    IOUtils.closeQuietly(inStream);
}
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