SpringMVC 文件下载

Spring中文件下载相当的简单，只需要以下几行代码。需要注意的是文件名如果包含中文等，需要URLEncoder转码。

@Controller
public class TestDownloadController {
	@RequestMapping("/basic/download")
	public ResponseEntity<byte[]> fileDownload(String filename, HttpServletRequest request) throws IOException {
	    File file = new File("C:\\download\\" + filename);
	    if (!file.exists()) {
	    	return null;
	    }
	    filename = URLEncoder.encode(filename, "UTF-8");
	    HttpHeaders headers = new HttpHeaders();
	    headers.setContentDispositionFormData("attachment", filename);
	    headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
	    return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file), headers, HttpStatus.OK);
	}
}