https://blog.csdn.net/Lynn_coder/article/details/79953977
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项目需要生成excel表格,然后返回给用户,用户需要下载这个excel表格,所以封装了一下返回文件流的方法
public ResponseEntity<FileSystemResource> export(File file) {
if (file == null) {
return null;
}
HttpHeaders headers = new HttpHeaders();
headers.add("Cache-Control", "no-cache, no-store, must-revalidate");
headers.add("Content-Disposition", "attachment; filename=" + System.currentTimeMillis() + ".xls");
headers.add("Pragma", "no-cache");
headers.add("Expires", "0");
headers.add("Last-Modified", new Date().toString());
headers.add("ETag", String.valueOf(System.currentTimeMillis())); return ResponseEntity .ok() .headers(headers) .contentLength(file.length()) .contentType(MediaType.parseMediaType("application/octet-stream")) .body(new FileSystemResource(file));
}
使用方法很简单,传入file就行了,如果和springmvc结合一下的话,加上conroller,示例代码如下:
@RequestMapping(value = "export_xls.html", method = RequestMethod.GET)
public ResponseEntity<FileSystemResource> exportXls() {
return export(new File("E:\\mydict.xls"));
}
这段的意思就是返回E盘下的mydict.xls给用户