瑞吉外卖 文件下载上传

瑞吉外卖 文件下载上传

# 瑞吉外卖 文件上传和下载

```java
@Slf4j
@RestController
@RequestMapping("/common")
public class FileController {

    @Value("${reggie.path}")
    String path;

    //文件上传
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) throws IOException {
        String originalFilename = file.getOriginalFilename();//原始文件名
        String suffix = originalFilename.substring(originalFilename.lastIndexOf(".")); //得到 => .jpg
        //使用UUID重新生成文件名，防止文件名重复造成文件覆盖
        String fileName = UUID.randomUUID().toString() + suffix; //sdfwdsgvsdv.jpg
        //创建目录对象
        File dir = new File(path);
        //判断当前目录是否存在
        if (!dir.exists()) {
            dir.mkdir();//目录不存在的话创建它
        }
        file.transferTo(new File(path + fileName));//临时文件转存到指定位置
        return R.success(fileName);
    }

    //文件下载
    @PostMapping("/download")
    public void download(String name, HttpServletResponse response) throws IOException {
        //输入流读取文件内容
        FileInputStream fileInputStream = new FileInputStream(new File(path + name));
        //输出流写回浏览器
        ServletOutputStream outputStream = response.getOutputStream();
        response.setContentType("image/jpeg");
        byte[] bytes = new byte[1024];
        int length = 0;
        while ((length = fileInputStream.read(bytes)) != -1) {
            outputStream.write(bytes, 0, length);
            outputStream.flush();
        }
        outputStream.close();
        fileInputStream.close();
    }
}
```