2

我试图让用户从服务器下载文件。我在控制器中使用 ServletOutputStream(这里是代码)

@RequestMapping(value = "/get-backup-file", method = RequestMethod.GET)
@ResponseBody
public void getBackupFile(
    HttpServletRequest request, 
    HttpServletResponse response) throws MalformedURLException, IOException {

    File backupFile = new File("PATH_TO_FILE");        

    ServletOutputStream out = response.getOutputStream();

    response.setContentType("application/octet-stream");
    response.setContentLength((int)backupFile.length());
    response.setHeader("Content-Disposition", "attachment; filename=\"" + "database backup" + "\"");

    FileInputStream in = new FileInputStream(backupFile);
    byte[] buffer = new byte[4096];

    int length;
    while( (length = in.read(buffer) ) > 0) {
        out.write(buffer, 0, length);
    }
    in.close();
    out.flush();        
} 

我的客户端看起来像这样:

      $.ajax({
        url: 'URL_TOCONTROLLER_METHOD',
        contentType: "application/octet-stream; charset=utf-8",
        type: 'GET',
        success: function(data) {
            console.log(data);
        },
        error: function(data) {   
            console.log("error");
        }
    });

当我控制台记录数据时,它具有文件的内容,但我希望用户下载此文件,而不仅仅是打印。如何让用户将数据保存为文件?

4

3 回答 3

3

You have to send path where the file stored and open its on success function,then user can download it

if success is like that

{"status":"success","path":"temp\/Vehicle_Units_2013_11_04.xls"}

script is

success: function(msg)
                  {
                      if(msg.status=="session-expired")
                      {
                      window.location.replace("index.jsp");
                      }
                      if(msg.status=="success")
                      {
                          window.open(msg.path);
                      }

                  }
于 2013-11-04T10:23:42.330 回答
-1

您不能使用 Ajax 强制下载文件。出于多种安全原因,Javascript 无法将文件保存到用户的计算机。解决方案是制作一个为下载页面提供服务的控制器,并让您的success功能更改window.location为它。

success : function (data) {
    window.location = data;
}

假设data只是 URL。您可以使用 JSON 或任何其他可以从中检索链接的响应格式使其更加健壮。

于 2013-11-04T13:32:28.650 回答
-1

不要使用ajax。而是提供下载链接。

<a href="URL_TOCONTROLLER_METHOD" download>Click To Download</a>
于 2017-07-09T03:03:43.137 回答