从Spring返回Excel可下载文件 [英] Return Excel downloadable file from Spring

问题描述

所以我有一个Spring控制器，我想创建一个Excel文件并返回它，以便它被浏览器下载。

So I have a Spring controller, and I'd like to create an Excel file and return it so that it is downloaded by the browser.

我正在使用JEXcelApi。

I'm using JEXcelApi.

这是我的控制器代码

@RequestMapping(value="/excel/cols/{colString}/rows/{rowString}/", method = RequestMethod.GET)
@ResponseBody
public ResponseEntity<String> exportExcel(HttpServletResponse response,
    @PathVariable List<String> colString,
    @PathVariable List<String> rowString) throws JSONException, IOException, WriteException {
    WritableWorkbook workbook = Workbook.createWorkbook(new File("exported.xls"));
    WritableSheet sheet = workbook.createSheet("Exported",0);
    String[] cols = colString.get(0).split(",");
    String[] rows = rowString.get(0).split(","); 
    for(int i = 0; i < cols.length;i++){
        Label label = new Label(i,0, cols[i]);
        sheet.addCell(label);
    }
    int excelCol = 0;
    int excelRow = 1;
    for(int i = 0; i < rows.length;i++){
        Label label = new Label(excelCol,excelRow, rows[i]);
        sheet.addCell(label);
        excelCol++;
        if((i+1) % cols.length == 0){
            excelCol = 0;
            excelRow++;
        }
    }
    workbook.write();
    workbook.close();
    return null;
}

我该怎么做？我怀疑可以设置一些内容标题。我知道一种方法是使用Spring的Abstract Excel视图类，但是有一个更简单的方法？

How do I do that? I suspect there's some content header I can set. I know one method is to use Spring's Abstract Excel view class, but is there a simpler method?

推荐答案

您需要设置 Content-Disposition p>

You need to set the Content-Disposition header.

response.setHeader("Content-disposition","attachment; filename=" + yourFileName);

并将字节直接写入响应 OutputStream 。

and write your bytes directly to the response OutputStream.

File xls = new File("exported.xls"); // or whatever your file is
FileInputStream in = new FileInputStream(xls);
OutputStream out = response.getOutputStream();

byte[] buffer= new byte[8192]; // use bigger if you want
int length = 0;

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

---

以上是比较老的。您可以使用 ResponseEntity core / io / FileSystemResource.htmlrel =nofollow> FileSystemResource 。 ResourceHttpMessageConverter 将按照上面的建议复制字节。 Spring MVC使您更简单，而不是让您与Servlet规范中的接口交互。

---

The above is relatively old. You can construct a ResponseEntity with FileSystemResource now. A ResourceHttpMessageConverter will then copy the bytes, as I have suggested above, for you. Spring MVC makes it simpler for you rather than having you interact with interfaces from the Servlet specification.

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