java画缩率图

野性酷女 2023-02-10 15:28 116阅读 0赞

1、控制器代码

private int imgWidth=150;//缩率图宽度
    private int imgHeight=150;//缩率图宽度
    
    //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();
                }
                //缩率图
                String file_name_min = uuid+"_min" + suff;
                //
                FileUtils.thumbnail( multipartFile,filePath,file_name_min,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、缩率图方法

import org.springframework.web.multipart.MultipartFile;
    
    import javax.imageio.ImageIO;
    import java.awt.*;
    import java.awt.image.BufferedImage;
    import java.io.*;
    import java.net.URL;
    
    
    /**
         * 保存缩率图
         * @param multipartFile 图片文件
         * @param path          保存的路径
         * @param fileName      文件名
         * @param sWidth        缩率图宽度
         * @param sHeight       缩率图高度
         */
        public static void thumbnail(MultipartFile multipartFile, String path, String fileName,int sWidth,int sHeight ) {
            OutputStream oStream = null;
            try {
                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
                int wrate = width / sWidth;    //宽度缩略图
                int hrate = height / sHeight;//高度缩略图
                int rate = 0;
                if (wrate > hrate) {//宽度缩略图比例大于高度缩略图，使用宽度缩略图
                    rate = wrate;
                } else {
                    rate = hrate;
                }
                //计算缩略图最终的宽度和高度
                int newWidth = width / rate;
                int newHeight = height / rate;
    
                BufferedImage bufferedImage = new BufferedImage( newWidth, newHeight, BufferedImage.TYPE_INT_RGB );
                //图片缩略图实现
                bufferedImage.getGraphics().drawImage( image.getScaledInstance( newWidth, newHeight, image.SCALE_SMOOTH ), 0, 0, null );
                //*image/jpeg
                String imageType = multipartFile.getContentType().substring( multipartFile.getContentType().indexOf( "/" ) + 1 );
                ImageIO.write( bufferedImage, imageType, oStream );
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                try {
                    oStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }