[ Java ] 자바 - 저장된 이미지 파일 변환 후 사이즈 조정

SMALL

변환할 확장자나 사이즈는 알맞게 수정하시면 됩니다.

 

 

File file = new File(_파일경로_, _파일명_);

File flTgt = new File(_생성경로_, _생성파일명_+".jpg");

boolean isConvert = ImageUtils.convertFmt(file, flTgt);
if(isConvert) {
	ImageUtils.resizeImage(flTgt.getPath(), 1920, 1080);
}

 

ImageUtils.java

public class ImageUtils {
	public static boolean convertFmt(File flSrc, File flTgt) throws Exception {
		boolean result = false;
		boolean isConvert = false;
		
		String srcExt = FilenameUtils.getExtension(flSrc.getPath());
		
		String tgtExt = FilenameUtils.getExtension(flTgt.getPath());
		
		srcExt = srcExt.toLowerCase();
		tgtExt = tgtExt.toLowerCase();
			
			try{
				//원본파일 복제
				String strSrcPath = flSrc.getPath().split("\\.")[0];
				String strOriPath = strSrcPath + "_ori." + srcExt;
				File ori = new File(strOriPath);				
				FileUtils.copyFile(flSrc, ori);
				
				FileInputStream inputStream = new FileInputStream(strOriPath);
				FileOutputStream outputStream = new FileOutputStream(strSrcPath + "." + tgtExt);
				BufferedImage oriImage = ImageIO.read(inputStream);
				
				if(oriImage == null){
					throw new BlcmException("허용되지 않은 형식의 파일입니다.");
				}
				BufferedImage newOriImage = new BufferedImage(oriImage.getWidth(), 
															  oriImage.getHeight(), 
															  BufferedImage.TYPE_INT_RGB);
				newOriImage.createGraphics().drawImage(oriImage, 0, 0, Color.WHITE, null);
				
				isConvert = ImageIO.write(newOriImage, tgtExt, outputStream);
				
				outputStream.close();
				inputStream.close();
				
				if(isConvert){
					
					if(ori.exists()){
						if(!FileUtils.deleteQuietly(ori)){
							ori.delete();
						}
					}
					if(flSrc.exists() && !flSrc.getPath().equals(flTgt.getPath())){
						if(!FileUtils.deleteQuietly(flSrc)){
							flSrc.delete();
						}
					}
					
				}
				
				result = true;
			
			} catch (IOException e) {
				throw e;
			} catch (IllegalArgumentException e) {
				throw e;
			}
			return result;
	}
	
	public static void resizeImage(String srcPath, int maxWidth, int maxHeight) throws Exception{
		
			//변환할 값과 비율
			int rsltWidth = 0;
			int rsltHeight = 0;
			float maxRatio = maxHeight / (float)maxWidth;
			String ext = FilenameUtils.getExtension(srcPath);
			
			//이미지 읽기
			File inputFile = new File(srcPath);
			BufferedImage inputImage = ImageIO.read(inputFile);

			//이미지 정보
			int width = inputImage.getWidth();
			int height = inputImage.getHeight();
			float ratio = height / (float)width;
			
            		//사진이 변환 사이즈보다 클 경우 변환 진행
			if(width > maxWidth || height > maxHeight) {
				
				if(ratio < maxRatio) {
					rsltWidth = (int)(width * (maxWidth / (float)width));
					rsltHeight = (int)(height * (maxWidth / (float)width));
				}else{
					rsltWidth = (int)(width * (maxHeight / (float)height));
					rsltHeight = (int)(height * (maxHeight / (float)height));
				}
				
			}else{
				return;
			}

			Image srcImg = null;
			if(ext.equals("bmp") || ext.equals("png") || ext.equals("gif")){
				srcImg = ImageIO.read(inputFile);
			}else{
				srcImg = new ImageIcon(inputFile.toURL()).getImage();
			}
			
			Image imgTarget = srcImg.getScaledInstance(rsltWidth, rsltHeight, Image.SCALE_SMOOTH);
			int pixels[] = new int[rsltWidth * rsltHeight];
			PixelGrabber pg = new PixelGrabber(imgTarget, 0, 0, rsltWidth, rsltHeight, pixels, 0, rsltWidth);
			pg.grabPixels();
			
			BufferedImage outputImage = new BufferedImage(rsltWidth, rsltHeight, inputImage.getType());
			outputImage.setRGB(0, 0,  rsltWidth, rsltHeight, pixels, 0, rsltWidth);
			
			ImageIO.write(outputImage, ext, new File(srcPath));			
	}
}