java图片截取中间指定长度的方图片

一时失言乱红尘 2023-02-11 03:22 41阅读 0赞

1、控制器代码：

//上传图片
        @PostMapping("/imgOtherUpload")
        public ResponseResult uploadOtherImg(@RequestParam("multipartFile") MultipartFile multipartFile,Integer checkUserId) {
            try {
    
                if (multipartFile.isEmpty() || StringUtils.isBlank( multipartFile.getOriginalFilename() )) {
                    return new ResponseResult( CommonCode.INVALID_PARAM );
                }
                String contentType = multipartFile.getContentType();
                if (!contentType.contains( "image" )) {
                    return new ResponseResult( CommonCode.INVALID_PARAM );
                }
                String root_fileName = multipartFile.getOriginalFilename();
                logger.info( "上传图片:name={},type={}", root_fileName, contentType );
    
                String date = DateFormatUtils.format( new Date(), "/yyyy/MM/dd/" );
                String directoryName = "other";
                String  filePath = location + "/"+directoryName  + date;
    
    
                logger.info( "图片保存路径={}", filePath );
                String suff = root_fileName.substring( root_fileName.lastIndexOf( "." ) );
                //原图
                String uuid = UUID.randomUUID().toString();
                String file_name_max = uuid+"_max" + suff;
                try {
                    FileUtils.saveFile( multipartFile, filePath, file_name_max );
                } catch (IOException e) {
                    e.printStackTrace();
                }
                //指定截取的小图片
                String file_name_min = uuid+"_min" + suff;
                FileUtils.cutImage( multipartFile,filePath,file_name_min,0,0,imgWidth,imgHeight );
    
                HashMap<String, String> map = new HashMap<>();
                map.put( "img_path", "/"+directoryName+date + file_name_min );
                map.put( "img_show", domain +"/"+directoryName+ date + file_name_min );
                return new ResponseResult( CommonCode.SUCCESS, map );
    
            } catch (Exception e) {
                e.printStackTrace();
                return new ResponseResult( CommonCode.FAIL );
            }
    
        }

2、截取代码：

/**
         * 指定坐标，截取正方形的图片
         *
         * @param multipartFile 图片
         * @param path          路径
         * @param fileName      文件名
         * @param x             起始x位置
         * @param y             起始y位置
         * @param newWidth      要截取的宽度
         * @param newHeight     要截取的高度
         * @throws IOException
         */
        public static void cutImage(MultipartFile multipartFile, String path, String fileName, int x,
                                  int y, int newWidth, int newHeight) throws IOException {
            ImageInputStream imageStream = null;
            OutputStream oStream = null;
            try {
                String imageType = multipartFile.getContentType().substring( multipartFile.getContentType().indexOf( "/" ) + 1 );
                System.out.println(imageType);
                //保存路径
                String des = path + fileName;
                oStream = new FileOutputStream( des );
    
                //ImageIO获取图片流信息
                Image image = ImageIO.read( multipartFile.getInputStream() );
                int width = image.getWidth( null ); //获取原图宽度
                int height = image.getHeight( null );//获取原图高度
                if (width < newWidth) {
                    newWidth = width;
                    newHeight = width;
                }
                if (height < newWidth) {
                    newWidth = width;
                    newHeight = width;
                }
                //从原始图的中间截取方图片
                if (width > newWidth) {
                    x = (width - newWidth) / 2;
                }
    
                if (height > newWidth) {
                    y = (height - newWidth) / 2;
                }
    
                Iterator<ImageReader> readers = ImageIO.getImageReadersByFormatName( imageType );
                ImageReader reader = readers.next();
                imageStream = ImageIO.createImageInputStream( multipartFile.getInputStream() );
                reader.setInput( imageStream, true );
                ImageReadParam param = reader.getDefaultReadParam();
    
                Rectangle rect = new Rectangle( x, y, newWidth, newHeight );
                param.setSourceRegion( rect );
                BufferedImage bi = reader.read( 0, param );
                ImageIO.write( bi, imageType, oStream );
            } finally {
                imageStream.close();
                oStream.close();
            }
        }