下载

    // 设置为下载application/x-download
    resp.setContentType("application/x-download");
    // 下载后的文件名称
    String downloadFileName = "abc.txt";
    // 编码转换
    downloadFileName = URLEncoder.encode(downloadFileName, "UTF-8");
    resp.addHeader("Content-Disposition", "attachment;filename="
      + downloadFileName);
    try {
     OutputStream os = resp.getOutputStream();
     FileInputStream fis = new FileInputStream(filePath);
     byte[] b = new byte[1024]
     int i = 0;
     while ((i = fis.read(b)) > 0) {
      os.write(b, 0, i);
     }
     fis.close();
     os.flush();
     os.close();
    }