使用springMVC实现上传下载图片

深藏阁楼爱情的钟 2023-03-14 05:48 60阅读 0赞

上传多张图片代码：

public static final String PICTUREURL = "/mnt/pic/";//图片路径
    public static final String PC_PICTUREURL = "E:\\pic";//图片路径
    
    @RequestMapping("/uploadPics.do")
        public RetObj uploadPics(@Param("file") MultipartFile[] files,@Param("trendId") Integer trendId){ 
            RetObj ret = new RetObj();
            try { 
                if (files!=null &&files.length>0){ 
                    List<Picture> result = new LinkedList<>();
                    int i =1;
                    for (MultipartFile file : files){ 
                        String filename = "picture_" + UUID.randomUUID() + ".jpg";//生成唯一图片路径
                        if (!file.isEmpty()) { 
                            try { 
                                File filepath = new File(PC_PICTUREURL);
                                if (!filepath.exists())
                                    filepath.mkdirs();
                                // 文件保存路径
                                String savePath = PC_PICTUREURL + filename;
                                // 转存文件
                                file.transferTo(new File(savePath));
                                //图片路径存到数据库
                                Picture picture = new Picture();
                                picture.setTrendid(trendId);
                                picture.setPath(savePath);
                                picture.setSort(i);
                                pictureService.insert(picture);
                                i++;
                                result.add(picture);
                            } catch (Exception e) { 
                                e.printStackTrace();
                            }
                        }
                    }
                    ret.setObj(result);
                }else { 
                    ret.Fail("请选择上传的图片");
                    return ret;
                }
            }catch (Exception e){ 
                log.error("图片上传失败"+ ExceptionUtil.getStackStr(e));
                ret.Fail("网络异常");
            }
            return ret;
        }

查看图片代码：

@RequestMapping("/getPic.do")
        public void getPic(HttpServletResponse response, @Param("url") String url){ 
            File file = new File(url);
            FileInputStream fis =null;
            try { 
                if (!file.exists()){ 
                    return;
                }
                fis = new FileInputStream(file);
                final byte[] buf = new byte[1024];
                while (fis.read(buf)>0){ 
                    response.getOutputStream().write(buf);
                }
            }catch (Exception e){ 
                log.error("图片上传失败"+ ExceptionUtil.getStackStr(e));
            }finally { 
                if (fis!=null){ 
                    try { 
                        fis.close();
                    }catch (Exception e){ 
    
                    }
                }
                response.setStatus(HttpServletResponse.SC_MOVED_PERMANENTLY);
            }
    
        }