上传图片

柔情只为你懂 2021-12-23 13:47 454阅读 0赞

@Service
    public class FileServiceImpl implements FileService {
    	
    	private String localPath = "E:/jt-upload/";//本地磁盘路径
    	private String urlPath = "http://image.jt.com/";
    	/*
    	 * 1.判断文件是否为图片  .jpg|png|gif
    	 * 2.判断是否为恶意程序
    	 * 3.分文件存储
    	 * 4.保证文件不重名
    	 */
    	@Override
    	public PicUploadResult uploadFile(MultipartFile uploadFile) {
    		PicUploadResult result = new PicUploadResult();
    		//1.获取图片名称   ABC.JPG|PNG|GIF
    		String fileName = uploadFile.getOriginalFilename();
    		fileName = fileName.toLowerCase();//将字符全部小写
    		//2.使用正则表达式判断
    		if(!fileName.matches("^.*(jpg|png|gif)$")){
    			result.setError(1);//表示不是图片
    			return result;
    		}
    		//3.判断图片是否为恶意程序
    		try {
    			BufferedImage bufferedImage = 
    					ImageIO.read(uploadFile.getInputStream());
    			
    			int width = bufferedImage.getWidth();
    			int height = bufferedImage.getHeight();
    			
    			if(width == 0 || height ==0){
    				result.setError(1);
    				return result;
    			}
    			
    			//4.为了实现分文件存储 yyyy/MM/dd
    			String dateDir = 
    		new SimpleDateFormat("yyyy/MM/dd")
    		.format(new Date()).toString();
    			
    			//创建文件夹   E:/jt-upload/2018/11/11
    			String fileDir = localPath + dateDir;
    			File dirFile = new File(fileDir);
    		
    			if(!dirFile.exists()){
    				dirFile.mkdirs();
    			}
    			
    			/*
    			 * 5.防止文件重名
    			 * 	 5.1截取文件的后缀
    			 *   5.2使用UUID当文件名 + 随机数3位
    			 */
    			String fileType = 
    					fileName.substring(fileName.lastIndexOf("."));
    			
    			String UUIDName = UUID.randomUUID().toString()
    					.replace("-", "");
    			int randomNum = new Random().nextInt(1000);
    			
    			//fa907e5e9f9a11e891a854ee75ecd89b123.jpg
    			String realFileName = UUIDName + randomNum + fileType;
    			
    			//实现文件上传
    			/**
    			 * E:jt-upload/yyyy/MM/dd/54ee75ecd89b123.jpg
    			 */
    			String realLocalPath = fileDir + "/" + realFileName;
    			uploadFile.transferTo(new File(realLocalPath));
    			
    			//设定图片宽度和高度
    			result.setHeight(height +"");
    			result.setWidth(width + "");
    			
    			/**
    			 * 现图片回显 定义网络请求路径
    			 * http://image.jt.com/yyyy/MM/ddasdfasdfadsfasdf.jpg
    			 */
    			String realUrlPath = urlPath + dateDir + "/" + realFileName;
    			result.setUrl(realUrlPath);
    		} catch (Exception e) {
    			e.printStackTrace();
    			//不是图片
    			result.setError(1);
    			return result;
    		}
    		return result;
    	}
    }

<dependency>
         <groupId>commons-fileupload</groupId>
         <artifactId>commons-fileupload</artifactId>
         <version>1.3.1</version>
     </dependency>
     <dependency>
         <groupId>org.apache.commons</groupId>
         <artifactId>commons-lang3</artifactId>
         <version>3.3.2</version>
     </dependency>