java缩小图片

最新推荐文章于 2025-02-28 00:15:00 发布

liyaxue

最新推荐文章于 2025-02-28 00:15:00 发布

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分类专栏： java 文章标签： java BufferedImage

本文链接：https://blog.youkuaiyun.com/liyaxue/article/details/51695013

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<span style="font-size:18px;">/**
	 * 减小图片尺寸
	 * @param path        -- 图片路径
	 * @param os          -- 输出
	 * @param mediaType   -- 后缀名
	 * @throws IOException
	 */
	public void decreaseImageSize(String path, OutputStream os, String mediaType) throws IOException{
		try{
			File file = new File(path);
			if(file.length()==0) return;
			BufferedImage image = ImageIO.read(file);
			/** 获取原图尺寸 */
			int width = image.getWidth();
			int height = image.getHeight();
			/** 缩放比例 */
			int size = 1;
			if(this.quality==CodeConst.MEDIA_SMALLPIC_HIGH){
				size = 2;
			}else if(this.quality==CodeConst.MEDIA_SMALLPIC_NORMAL){
				size = 3;
			}else if(this.quality==CodeConst.MEDIA_SMALLPIC_LOW){
				size = 5;
			}
			width = width/size;
			height = height/size;
			int rgb = BufferedImage.TYPE_INT_RGB;
			if("png".equalsIgnoreCase(mediaType)){
				rgb = BufferedImage.TYPE_INT_ARGB;
			}
			BufferedImage bi = new BufferedImage(width, height, rgb);
			Graphics g = bi.getGraphics();
			Image small = image.getScaledInstance(width, height, Image.SCALE_DEFAULT);
			g.drawImage(small, 0, 0, null);
			ImageIO.write(bi, mediaType, os);
		}catch (IndexOutOfBoundsException e) {
			
		}
	}</span>