package com.hmw.picMark;import java.awt.AlphaComposite;import java.awt.Color;import java.awt.Font;import java.awt.Graphics2D;import java.awt.Image;import java.awt.geom.AffineTransform;import java.awt.image.AffineTransformOp;import java.awt.image.BufferedImage;import java.io.File;import java.io.IOException;import javax.imageio.ImageIO;/** * 图片工具类， 图片水印，文字水印，缩放，补白等 * @author Carl He */public final class ImageUtils {/**图片格式：JPG*/private static final String PICTRUE_FORMATE_JPG = "jpg";private ImageUtils(){}/** * 添加图片水印 * @param targetImg 目标图片路径，如：C://myPictrue//1.jpg * @param waterImg 水印图片路径，如：C://myPictrue//logo.png * @param x 水印图片距离目标图片左侧的偏移量，如果x<0, 则在正中间 * @param y 水印图片距离目标图片上侧的偏移量，如果y<0, 则在正中间 * @param alpha 透明度(0.0 -- 1.0, 0.0为完全透明，1.0为完全不透明) */public final static void pressImage(String targetImg, String waterImg, int x, int y, float alpha) {try {File file = new File(targetImg);Image image = ImageIO.read(file);int width = image.getWidth(null);int height = image.getHeight(null);BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);Graphics2D g = bufferedImage.createGraphics();g.drawImage(image, 0, 0, width, height, null);Image waterImage = ImageIO.read(new File(waterImg));// 水印文件int width_1 = waterImage.getWidth(null);int height_1 = waterImage.getHeight(null);g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha));int widthDiff = width - width_1;int heightDiff = height - height_1;if(x < 0){x = widthDiff / 2;}else if(x > widthDiff){x = widthDiff;}if(y < 0){y = heightDiff / 2;}else if(y > heightDiff){y = heightDiff;}g.drawImage(waterImage, x, y, width_1, height_1, null); // 水印文件结束g.dispose();ImageIO.write(bufferedImage, PICTRUE_FORMATE_JPG, file);} catch (IOException e) {e.printStackTrace();}}/** * 添加文字水印 * @param targetImg 目标图片路径，如：C://myPictrue//1.jpg * @param pressText 水印文字， 如：中国证券网 * @param fontName 字体名称，如：宋体 * @param fontStyle 字体样式，如：粗体和斜体(Font.BOLD|Font.ITALIC) * @param fontSize 字体大小，单位为像素 * @param color 字体颜色 * @param x 水印文字距离目标图片左侧的偏移量，如果x<0, 则在正中间 * @param y 水印文字距离目标图片上侧的偏移量，如果y<0, 则在正中间 * @param alpha 透明度(0.0 -- 1.0, 0.0为完全透明，1.0为完全不透明) */public static void pressText(String targetImg, String pressText, String fontName, int fontStyle, int fontSize, Color color, int x, int y, float alpha) {try {File file = new File(targetImg);Image image = ImageIO.read(file);int width = image.getWidth(null);int height = image.getHeight(null);BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);Graphics2D g = bufferedImage.createGraphics();g.drawImage(image, 0, 0, width, height, null);g.setFont(new Font(fontName, fontStyle, fontSize));g.setColor(color);g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha));int width_1 = fontSize * getLength(pressText);int height_1 = fontSize;int widthDiff = width - width_1;int heightDiff = height - height_1;if(x < 0){x = widthDiff / 2;}else if(x > widthDiff){x = widthDiff;}if(y < 0){y = heightDiff / 2;}else if(y > heightDiff){y = heightDiff;}g.drawString(pressText, x, y + height_1);g.dispose();ImageIO.write(bufferedImage, PICTRUE_FORMATE_JPG, file);} catch (Exception e) {e.printStackTrace();}}/** * 获取字符长度，一个汉字作为 1 个字符, 一个英文字母作为 0.5 个字符 * @param text * @return 字符长度，如：text="中国",返回 2；text="test",返回 2；text="中国ABC",返回 4. */public static int getLength(String text) {int textLength = text.length();int length = textLength;for (int i = 0; i < textLength; i++) {if (String.valueOf(text.charAt(i)).getBytes().length > 1) {length++;}}return (length % 2 == 0) ? length / 2 : length / 2 + 1;}/** * 图片缩放 * @param filePath 图片路径 * @param height 高度 * @param width 宽度 * @param bb 比例不对时是否需要补白 */public static void resize(String filePath, int height, int width, boolean bb) {try {double ratio = 0; //缩放比例 File f = new File(filePath); BufferedImage bi = ImageIO.read(f); Image itemp = bi.getScaledInstance(width, height, BufferedImage.SCALE_SMOOTH); //计算比例 if ((bi.getHeight() > height) || (bi.getWidth() > width)) { if (bi.getHeight() > bi.getWidth()) { ratio = (new Integer(height)).doubleValue() / bi.getHeight(); } else { ratio = (new Integer(width)).doubleValue() / bi.getWidth(); } AffineTransformOp op = new AffineTransformOp(AffineTransform.getScaleInstance(ratio, ratio), null); itemp = op.filter(bi, null); } if (bb) { BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics2D g = image.createGraphics(); g.setColor(Color.white); g.fillRect(0, 0, width, height); if (width == itemp.getWidth(null)) g.drawImage(itemp, 0, (height - itemp.getHeight(null)) / 2, itemp.getWidth(null), itemp.getHeight(null), Color.white, null); else g.drawImage(itemp, (width - itemp.getWidth(null)) / 2, 0, itemp.getWidth(null), itemp.getHeight(null), Color.white, null); g.dispose(); itemp = image; } ImageIO.write((BufferedImage) itemp, "jpg", f); } catch (IOException e) {e.printStackTrace();}}public static void main(String[] args) throws IOException {pressImage("C://pic//jpg", "C://pic//test.gif", 5000, 5000, 0f);pressText("C://pic//jpg", "旺仔之印", "宋体", Font.BOLD|Font.ITALIC, 20, Color.BLACK, 0, 0, 8f);resize("C://pic//4.jpg", 1000, 500, true);}}
