外卖系统 文件上传

04 文件上传

/** * 文件上传和下载 */
@Slf4j
@RestController
@RequestMapping("/common")
public class CommonController {
    

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

    @PostMapping("/upload")
    public String upload(MultipartFile file){
    
        log.info(file.toString());

        //原始文件名
        String originalFilename = file.getOriginalFilename();
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));

        //使用uuid重新生成文件名
        String fileName = UUID.randomUUID().toString() + suffix;
        
        //创建目录对象
        File dir = new File(basePath);
        //判断目录是否存在
        if(!dir.exists()){
    
            //目录不存在，需要创建
            dir.mkdirs();
        }
        try{
    
            //将临时文件转存到指定位置
            file.transferTo(new File(basePath+"hello.jpg"));
        }catch (IOException ex){
    
            ex.printStackTrace();
        }
        return fileName;
    }

    /** * 文件下载 */
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){
    
        try{
    
            //输入流
            FileInputStream fileInputStream = new FileInputStream(new File(basePath + name));

            //输出流
            ServletOutputStream outputStream = response.getOutputStream();
            response.setContentType("image/jpeg");
            
            int len=0;
            byte[] bytes=new byte[1024];
            
            while ((len=fileInputStream.read(bytes))!=-1){
    
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }
            //关闭资源
            outputStream.close();
            fileInputStream.close();
            
        }catch (Exception e){
    
            e.printStackTrace();
        }
        
    }
}