Spring Rest 和 jQuery Ajax 文件下载

Question

我目前正在使用 jQuery 和 Spring Rest。 jQuery 用于上传和下载文件到服务器。上传过程运行良好，但下载文件没有什么问题。所以场景是，在视图中，用户将选择n个要下载的文件并单击下载按钮。一旦用户单击该按钮，文件将被下载。我不想为每个文件下载打开一个新的新标签。我想在同一个窗口下载而不刷新当前视图。我查看了this，但对我帮助不大。有什么办法，我可以做到这一点？

Answer 1

这是我下载文件的解决方案：

Spring 控制器方法：

@RequestMapping(value = "/download", method = RequestMethod.GET)
public void retrieveDocument(@RequestParam("id") String id, HttpServletResponse response) throws IOException {
    InputStream in = fileService.getFileStream(); // My service to get the stream.
    response.setContentType(MediaType.APPLICATION_OCTET_STREAM);
    response.setHeader("Content-Transfer-Encoding", "binary");
    response.setHeader("Content-Disposition", "attachment; filename=" + filename);
    try {
        IOUtils.copy(inputStream, response.getOuputStream()); //Apache commons IO.
        inputStream.close();
        response.flushBuffer();
        response.setStatus(HttpServletResponse.SC_OK);
    } catch (Exception e) {
        //log error.
    }

}

客户端功能：

function download(id) {
    var id = $('#file').attr('id')
    var xhr = new XMLHttpRequest();
    xhr.open('GET', 'url here' + id, true);
    xhr.responseType = 'arraybuffer';
    xhr.onload = function() {
        if(this.status == '200') {
           var filename = '';
           //get the filename from the header.
           var disposition = xhr.getResponseHeader('Content-Disposition');
           if (disposition && disposition.indexOf('attachment') !== -1) {
               var filenameRegex = /filename[^;=\n]*=((['"]).*?\2|[^;\n]*)/;
               var matches = filenameRegex.exec(disposition);
               if (matches !== null && matches[1])
                   filename = matches[1].replace(/['"]/g, '');
           }
           var type = xhr.getResponseHeader('Content-Type');
           var blob = new Blob([this.response],  {type: type});
           //workaround for IE
           if(typeof window.navigator.msSaveBlob != 'undefined') {
               window.navigator.msSaveBlob(blob, filename);
           }
           else {
               var URL = window.URL || window.webkitURL;
               var download_URL = URL.createObjectURL(blob);
               if(filename) {
                   var a_link = document.createElement('a');
                   if(typeof a_link.download == 'undefined') {
                       window.location = download_URL;
                   }else {
                       a_link.href = download_URL;
                       a_link.download = filename;
                       document.body.appendChild(a_link);
                       a_link.click();
                   }
               }else {
                   window.location = download_URL;
               }
               setTimeout(function() {
                   URL.revokeObjectURL(download_URL);
               }, 10000);
           }
        }else {
            alert('error')';//do something...
        }
    }; 
    xhr.setRequestHeader('Content-type', 'application/*');
    xhr.send();
}

Answer 2

几分钟前我回答了类似的问题：sending file from response to user, Spring REST + jQuery

---

我建议你使用这个 JS 插件https://github.com/johnculviner/jquery.fileDownload 来下载文件，而不是直接使用 $.ajax。你可以在那里找到所有的官方文档。

此外，在您的控制器中，您必须获取 HttpServletResponse 并将 byte[] 写入输出流，并且您必须在响应中放置一个 cookie 以告知 JS 插件（因为它需要它）

例如：

@RequestMapping(value = "/download", method = RequestMethod.GET)
    public void getFilesInZIP(@RequestParam("filenames[]") String[] filenames, HttpServletResponse httpServletResponse){
        byte[] file = service.packFilesToZIPArchiveAndReturnAsByteArray(filenames);

        Cookie cookie = new Cookie("fileDownload", "true");
        cookie.setPath("/");

        httpServletResponse.addCookie(cookie);
        httpServletResponse.setContentType("application/zip");
        httpServletResponse.setHeader("Content-Disposition", "attachment;filename=files.zip");
        httpServletResponse.getOutputStream().write(file);

    }