工具类 - 图片处理
package net.shopxx.util;import java.awt.AlphaComposite;import java.awt.Color;import java.awt.Graphics2D;import java.awt.Image;import java.awt.image.BufferedImage;import java.io.File;import java.io.IOException;import java.util.Iterator;import javax.imageio.ImageIO;import javax.imageio.ImageReader;import javax.imageio.stream.ImageInputStream;import net.shopxx.bean.SystemConfig.WatermarkPosition;/** * 工具类 - 图片处理 * ============================================================================ * 版权所有 2008-2010 长沙鼎诚软件有限公司，并保留所有权利。 * ---------------------------------------- * 提示：在未取得SHOP++商业授权之前，您不能将本软件应用于商业用途，否则SHOP++将保留追究的权力。 * ---------------------------------------- * 官方网站：http://www.shopxx.net * ---------------------------------------- * KEY: SHOPXX5DA8E8F8C18FAC121CA036F5BF31C086 * ============================================================================ */public class ImageUtil {/** * 图片缩放(图片等比例缩放为指定大小，空白部分以白色填充) * * @param srcBufferedImage * 源图片 * @param destFile * 缩放后的图片文件 */public static void zoom(BufferedImage srcBufferedImage, File destFile, int destHeight, int destWidth) {try {int imgWidth = destWidth;int imgHeight = destHeight;int srcWidth = srcBufferedImage.getWidth();int srcHeight = srcBufferedImage.getHeight();if (srcHeight >= srcWidth) {imgWidth = (int) Math.round(((destHeight * 1.0 / srcHeight) * srcWidth));} else {imgHeight = (int) Math.round(((destWidth * 1.0 / srcWidth) * srcHeight));}BufferedImage destBufferedImage = new BufferedImage(destWidth, destHeight, BufferedImage.TYPE_INT_RGB);Graphics2D graphics2D = destBufferedImage.createGraphics();graphics2D.setBackground(Color.WHITE);graphics2D.clearRect(0, 0, destWidth, destHeight);graphics2D.drawImage(srcBufferedImage.getScaledInstance(imgWidth, imgHeight, Image.SCALE_SMOOTH), (destWidth / 2) - (imgWidth / 2), (destHeight / 2) - (imgHeight / 2), null);graphics2D.dispose();ImageIO.write(destBufferedImage, "JPEG", destFile);} catch (IOException e) {e.printStackTrace();}}/** * 添加图片水印 * * @param srcBufferedImage * 需要处理的源图片 * @param destFile * 处理后的图片文件 * @param watermarkFile * 水印图片文件 * */public static void imageWatermark(BufferedImage srcBufferedImage, File destFile, File watermarkFile, WatermarkPosition watermarkPosition, int alpha) {try {int srcWidth = srcBufferedImage.getWidth();int srcHeight = srcBufferedImage.getHeight();BufferedImage destBufferedImage = new BufferedImage(srcWidth, srcHeight, BufferedImage.TYPE_INT_RGB);Graphics2D graphics2D = destBufferedImage.createGraphics();graphics2D.setBackground(Color.WHITE);graphics2D.clearRect(0, 0, srcWidth, srcHeight);graphics2D.drawImage(srcBufferedImage.getScaledInstance(srcWidth, srcHeight, Image.SCALE_SMOOTH), 0, 0, null);if (watermarkFile != null && watermarkFile.exists() && watermarkPosition != null && watermarkPosition != WatermarkPosition.no) {BufferedImage watermarkBufferedImage = ImageIO.read(watermarkFile);int watermarkImageWidth = watermarkBufferedImage.getWidth();int watermarkImageHeight = watermarkBufferedImage.getHeight();graphics2D.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha / 100.0F));int x = 0;int y = 0;if (watermarkPosition == WatermarkPosition.topLeft) {x = 0;y = 0;} else if (watermarkPosition == WatermarkPosition.topRight) {x = srcWidth - watermarkImageWidth;y = 0;} else if (watermarkPosition == WatermarkPosition.center) {x = (srcWidth - watermarkImageWidth) / 2;y = (srcHeight - watermarkImageHeight) / 2;} else if (watermarkPosition == WatermarkPosition.bottomLeft) {x = 0;y = srcHeight - watermarkImageHeight;} else if (watermarkPosition == WatermarkPosition.bottomRight) {x = srcWidth - watermarkImageWidth;y = srcHeight - watermarkImageHeight;}graphics2D.drawImage(watermarkBufferedImage, x, y, watermarkImageWidth, watermarkImageHeight, null);}graphics2D.dispose();ImageIO.write(destBufferedImage, "JPEG", destFile);} catch (Exception e) {e.printStackTrace();}}/** * 图片缩放并添加图片水印(图片等比例缩放为指定大小，空白部分以白色填充) * * @param srcBufferedImage * 需要处理的图片 * @param destFile * 处理后的图片文件 * @param watermarkFile * 水印图片文件 * */public static void zoomAndWatermark(BufferedImage srcBufferedImage, File destFile, int destHeight, int destWidth, File watermarkFile, WatermarkPosition watermarkPosition, int alpha) {try {int imgWidth = destWidth;int imgHeight = destHeight;int srcWidth = srcBufferedImage.getWidth();int srcHeight = srcBufferedImage.getHeight();if (srcHeight >= srcWidth) {imgWidth = (int) Math.round(((destHeight * 1.0 / srcHeight) * srcWidth));} else {imgHeight = (int) Math.round(((destWidth * 1.0 / srcWidth) * srcHeight));}BufferedImage destBufferedImage = new BufferedImage(destWidth, destHeight, BufferedImage.TYPE_INT_RGB);Graphics2D graphics2D = destBufferedImage.createGraphics();graphics2D.setBackground(Color.WHITE);graphics2D.clearRect(0, 0, destWidth, destHeight);graphics2D.drawImage(srcBufferedImage.getScaledInstance(imgWidth, imgHeight, Image.SCALE_SMOOTH), (destWidth / 2) - (imgWidth / 2), (destHeight / 2) - (imgHeight / 2), null);if (watermarkFile != null && watermarkFile.exists() && watermarkPosition != null && watermarkPosition != WatermarkPosition.no) {BufferedImage watermarkBufferedImage = ImageIO.read(watermarkFile);int watermarkImageWidth = watermarkBufferedImage.getWidth();int watermarkImageHeight = watermarkBufferedImage.getHeight();graphics2D.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha / 100.0F));int x = 0;int y = 0;if (watermarkPosition == WatermarkPosition.topLeft) {x = 0;y = 0;} else if (watermarkPosition == WatermarkPosition.topRight) {x = destWidth - watermarkImageWidth;y = 0;} else if (watermarkPosition == WatermarkPosition.center) {x = (destWidth - watermarkImageWidth) / 2;y = (destHeight - watermarkImageHeight) / 2;} else if (watermarkPosition == WatermarkPosition.bottomLeft) {x = 0;y = destHeight - watermarkImageHeight;} else if (watermarkPosition == WatermarkPosition.bottomRight) {x = destWidth - watermarkImageWidth;y = destHeight - watermarkImageHeight;}graphics2D.drawImage(watermarkBufferedImage, x, y, watermarkImageWidth, watermarkImageHeight, null);}graphics2D.dispose();ImageIO.write(destBufferedImage, "JPEG", destFile);} catch (Exception e) {e.printStackTrace();}}/** * 获取图片文件的类型. * * @param imageFile * 图片文件对象. * @return 图片文件类型 */public static String getImageFormatName(File imageFile) {try {ImageInputStream imageInputStream = ImageIO.createImageInputStream(imageFile);Iterator<ImageReader> iterator = ImageIO.getImageReaders(imageInputStream);if (!iterator.hasNext()) {return null;}ImageReader imageReader = (ImageReader) iterator.next();imageInputStream.close();return imageReader.getFormatName().toLowerCase();} catch (IOException e) {e.printStackTrace();}return null;}}