JAVA压缩图片质量大小，8M压缩到200K 以下方法避免了再linux上运行是提示java.lang.NoClassDefFoundError: com/sun/image/codec/jpeg/JPEGCodec异常 /** * 缩放图片(压缩图片质量，改变图片尺寸) * 若原图宽度小于新宽度，则宽度不变！ * * @param newWidth 新的宽度 * @param quality 图片质量参数 0.7f 相当于70%质量 */ public static void imageResize(File originalFile, File resizedFile, int maxWidth, int maxHeight, float quality) throws IOException { if (quality > 1) { throw new IllegalArgumentException( "图片质量需设置在0.1-1范围"); } ImageIcon ii = new ImageIcon(originalFile.getCanonicalPath()); Image i = ii.getImage(); Image resizedImage = null; int iWidth = i.getWidth(null); int iHeight = i.getHeight(null); int newWidth = maxWidth; if (iWidth < maxWidth) { newWidth = iWidth; } if (iWidth >= iHeight) { resizedImage = i.getScaledInstance(newWidth, (newWidth * iHeight) / iWidth, Image.SCALE_SMOOTH); } int newHeight = maxHeight; if (iHeight < maxHeight) { newHeight = iHeight; } if (resizedImage == null && iHeight >= iWidth) { resizedImage = i.getScaledInstance((newHeight * iWidth) / iHeight, newHeight, Image.SCALE_SMOOTH); } Image temp = new ImageIcon(resizedImage).getImage(); BufferedImage bufferedImage = new BufferedImage(temp.getWidth(null), temp.getHeight(null), BufferedImage.TYPE_INT_RGB); Graphics g = bufferedImage.createGraphics(); g.setColor(Color.white); g.fillRect(0, 0, temp.getWidth(null), temp.getHeight(null)); g.drawImage(temp, 0, 0, null); g.dispose(); float softenFactor = 0.05f; float[] softenArray = {0, softenFactor, 0, softenFactor, 1 - (softenFactor * 4), softenFactor, 0, softenFactor, 0}; Kernel kernel = new Kernel(3, 3, softenArray); ConvolveOp cOp = new ConvolveOp(kernel, ConvolveOp.EDGE_NO_OP, null); bufferedImage = cOp.filter(bufferedImage, null); FileOutputStream out = new FileOutputStream(resizedFile); //使用该方式避免linux异常 ImageIO.write(bufferedImage, "jpeg", out); // 以下方式本地执行正常，打包到服务器执行异常 // JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out); // // JPEGEncodeParam param = encoder // .getDefaultJPEGEncodeParam(bufferedImage); // // param.setQuality(quality, true); // // encoder.setJPEGEncodeParam(param); // encoder.encode(bufferedImage); }

图片上传|免费图片存储服务 请求方式{card-describe title="请求方式"}POSTmultipart/form-datahttps://pic.maven.vip/api/1/upload/?key={KEY}&format=jsonsource:file{/card-describe}

Graphics2D 图片上添加图片或绘制二维码 代码实例 // 读取原图片信息 //得到文件 File file = new File("d:\\1.png"); //文件转化为图片 Image srcImg = ImageIO.read(file); //获取图片的宽 int srcImgWidth = srcImg.getWidth(null); //获取图片的高 int srcImgHeight = srcImg.getHeight(null); // 加水印 BufferedImage bufImg = new BufferedImage(srcImgWidth, srcImgHeight, BufferedImage.TYPE_INT_RGB); Graphics2D g = bufImg.createGraphics(); g.drawImage(srcImg, 0, 0, srcImgWidth, srcImgHeight, null); //使用工具类生成二维码 Image image = createQrCode("二维码内容", 226, 226, "二维码中间logo图片地址"); //将小图片绘到大图片上,表示你的小图片在大图片上的位置。 g.drawImage(image, 263, 700, null); //或者将图片绘制上去 File file = new File("d:\\2.png"); BufferedImage read = ImageIO.read(file); Graphics2D k = bufImg.createGraphics(); //将小图片绘到大图片上,表示你的小图片在大图片上的位置。 k.drawImage(read, 650, 188, 150,150,null); k.setColor(Color.WHITE); k.dispose(); //设置颜色。 g.setColor(Color.WHITE); g.dispose(); ByteArrayOutputStream bs = new ByteArrayOutputStream(); ImageOutputStream imOut = ImageIO.createImageOutputStream(bs); ImageIO.write(bufImg, "png", imOut); InputStream inputStream = new ByteArrayInputStream(bs.toByteArray()); OutputStream outStream = new FileOutputStream("d:\\3.png"); IOUtils.copy(inputStream, outStream); inputStream.close(); outStream.close(); private static BufferedImage createQrCode(String content, int width, int height, String logoPath) throws IOException { QrConfig config = new QrConfig(width, height); if (logoPath != null) { Image image = ImageIO.read(new FileInputStream(new File(logoPath))); config.setImg(image); } config.setErrorCorrection(ErrorCorrectionLevel.H); return QrCodeUtil.generate( content, config); }二维码生成工具引用 <dependency> <groupId>cn.hutool</groupId> <artifactId>hutool-all</artifactId> <version>5.2.4</version> </dependency>