Question

我的用例是让我的应用程序从服务器下载excel（.xls）。 excel应该有图表。

这是它的服务器端代码

var objectArray = [{id_5:"100"},
                   {id_1:"300"},
                   {id_2:"500"},
                   {id_4:"700"},
                   {id_3:"200"}];

var normalArray = ["id_2","id_5","id_4"];
var newArray=objectArray.filter(function(item){
    return normalArray.indexOf(Object.keys(item)[0]) == -1;
}).sort(function(a,b){
    return a[Object.keys(a)[0]] - b[Object.keys(b)[0]];
});
console.log(newArray);

打开excel时，我收到一条警告消息，提示“文件错误：数据可能已丢失”。而且，我无法在下载的Excel中看到图表。

我还检查过将内容类型设置为'OCTET-STREAM'，但没有运气。

@RequestMapping(value="/downloadExcel", method=RequestMethod.GET)
public void download(HttpServletRequest request, HttpServletResponse response) {

    String fileName = "excel.xls";
    response.setContentType("APPLICATION/vnd.ms-excel");
    response.addHeader("Content-Disposition", "attachment; filename=" + fileName);
    try {
        Files.copy(new File(fileName), (OutputStream)response.getOutputStream());
        response.getOutputStream().flush();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

如何在不丢失数据的情况下传输Excel文件？

Answer 1

我使用此代码，我可以下载带图形的excel文件

void copyFileToResponse(HttpServletResponse response, File file) throws IOException {
        if(file != null) {
            String mimeType = URLConnection.guessContentTypeFromName(file.getName());
            if (mimeType == null) {
                logger.debug("mimetype is not detectable, will take default");
                mimeType = "application/octet-stream";
            }
            logger.debug("mimetype : {}", mimeType);
            response.setContentType(mimeType);
            response.setHeader("Content-Disposition", String.format("attachment; filename=\"%s\"", file.getName()));
            response.setContentLength((int) file.length());
            InputStream inputStream = new BufferedInputStream(new FileInputStream(file));
            FileCopyUtils.copy(inputStream, response.getOutputStream());
        }
    }

将excel文件作为Spring响应传输时丢失数据

1 个答案: