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重新调整尺寸

/*** * 功能描述: <br>* 〈调整图像到固定大小〉** @param srcImageFile  源图像文件地址* @param descImageFile 缩放后的图像地址* @param width         缩放后的宽度* @param height        缩放后的高度* @param isPadding     是否补白* */
public final static void changeSize(String srcImageFile, String descImageFile, int width, int height, boolean isPadding) {try {// 缩放比例double ratio = 0.0;File file = new File(srcImageFile);BufferedImage bufferedImage = ImageIO.read(file);Image image = bufferedImage.getScaledInstance(width, height, bufferedImage.SCALE_SMOOTH);// 计算缩放比例if (bufferedImage.getHeight() > bufferedImage.getWidth()) {ratio = (new Integer(height)).doubleValue() / bufferedImage.getHeight();} else {ratio = (new Integer(width)).doubleValue() / bufferedImage.getWidth();}AffineTransformOp op = new AffineTransformOp(AffineTransform.getScaleInstance(ratio, ratio), null);image = op.filter(bufferedImage, null);// 是否需要补白if (isPadding) {BufferedImage tempBufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);Graphics2D graphics2d = tempBufferedImage.createGraphics();graphics2d.setColor(Color.white);graphics2d.fillRect(0, 0, width, height);if (width == image.getWidth(null)) {graphics2d.drawImage(image, 0, (height - image.getHeight(null)) / 2, image.getWidth(null), image.getHeight(null), Color.white, null);} else {graphics2d.drawImage(image, (width - image.getWidth(null)) / 2, 0, image.getWidth(null), image.getHeight(null), Color.white, null);}graphics2d.dispose();image = tempBufferedImage;}ImageIO.write((BufferedImage) image, "png", new File(descImageFile));} catch (IOException e) {e.printStackTrace();}
}

合并两张PNG图片

/*** * 功能描述: <br>* 〈利用画布生成新的图片〉** @param backImage 背景图文件地址* @param srcImage  前景图文件地址* @param descImage 生成图文件地址* @return* */
public static void mergeImage(String backImage, String srcImage, String descImage) {try {int offset = 0;BufferedImage backBufferedImage = ImageIO.read(new File(backImage));BufferedImage srcBufferedImage = ImageIO.read(new File(srcImage));// 输出图片宽度int width = backBufferedImage.getWidth() + offset;// 输出图片高度int height = backBufferedImage.getWidth() + offset;BufferedImage descBufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_4BYTE_ABGR);Graphics2D graphics2d = (Graphics2D) descBufferedImage.getGraphics();graphics2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);// 往画布上添加图片,并设置边距graphics2d.drawImage(backBufferedImage, null, 0, 0);graphics2d.drawImage(srcBufferedImage, null, 175, 175);graphics2d.dispose();// 输出新图片ImageIO.write(descBufferedImage, "png", new File(descImage));} catch (Exception e) {e.printStackTrace();}
}

测试

public static void main(String[] args) throws IOException {// 重新调整b.png尺寸 生成d.pngchangeSize("d:\\b.png", "d:\\d.png", 640, 640, false);// 合并a.png+d.png->c.pngmergeImage("d:\\a.png", "d:\\d.png", "d:\\c.png");
}