java图片处理（文字水印、图片水印、缩放、补白）

最新推荐文章于 2021-02-16 15:24:23 发布

转载最新推荐文章于 2021-02-16 15:24:23 发布 · 492 阅读

本文介绍了一个图片处理工具类，该工具类提供了图片水印、文字水印、图片缩放等功能。支持不同类型的图片格式，并能根据需求调整水印的位置、透明度及文字字体样式。

package com.hmw.picMark; 2 3 import java.awt.AlphaComposite; 4 import java.awt.Color; 5 import java.awt.Font; 6 import java.awt.Graphics2D; 7 import java.awt.Image; 8 import java.awt.geom.AffineTransform; 9 import java.awt.image.AffineTransformOp; 10 import java.awt.image.BufferedImage; 11 import java.io.File; 12 import java.io.IOException; 13 14 import javax.imageio.ImageIO; 15 16 /** 17 * 图片工具类，图片水印，文字水印，缩放，补白等 18 * @author Carl He 19 */ 20 public final class ImageUtils { 21 /**图片格式：JPG*/ 22 private static final String PICTRUE_FORMATE_JPG = "jpg"; 23 24 private ImageUtils(){} 25 /** 26 * 添加图片水印 27 * @param targetImg 目标图片路径，如：C://myPictrue//1.jpg 28 * @param waterImg 水印图片路径，如：C://myPictrue//logo.png 29 * @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 30 * @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 31 * @param alpha 透明度(0.0 -- 1.0, 0.0为完全透明，1.0为完全不透明) 32 */ 33 public final static void pressImage(String targetImg, String waterImg, int x, int y, float alpha) { 34 try { 35 File file = new File(targetImg); 36 Image image = ImageIO.read(file); 37 int width = image.getWidth(null); 38 int height = image.getHeight(null); 39 BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); 40 Graphics2D g = bufferedImage.createGraphics(); 41 g.drawImage(image, 0, 0, width, height, null); 42 43 Image waterImage = ImageIO.read(new File(waterImg)); // 水印文件 44 int width_1 = waterImage.getWidth(null); 45 int height_1 = waterImage.getHeight(null); 46 g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha)); 47 48 int widthDiff = width - width_1; 49 int heightDiff = height - height_1; 50 if(x < 0){ 51 x = widthDiff / 2; 52 }else if(x > widthDiff){ 53 x = widthDiff; 54 } 55 if(y < 0){ 56 y = heightDiff / 2; 57 }else if(y > heightDiff){ 58 y = heightDiff; 59 } 60 g.drawImage(waterImage, x, y, width_1, height_1, null); // 水印文件结束 61 g.dispose(); 62 ImageIO.write(bufferedImage, PICTRUE_FORMATE_JPG, file); 63 } catch (IOException e) { 64 e.printStackTrace(); 65 } 66 } 67 68 /** 69 * 添加文字水印 70 * @param targetImg 目标图片路径，如：C://myPictrue//1.jpg 71 * @param pressText 水印文字，如：中国证券网 72 * @param fontName 字体名称，如：宋体 73 * @param fontStyle 字体样式，如：粗体和斜体(Font.BOLD|Font.ITALIC) 74 * @param fontSize 字体大小，单位为像素 75 * @param color 字体颜色 76 * @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 77 * @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 78 * @param alpha 透明度(0.0 -- 1.0, 0.0为完全透明，1.0为完全不透明) 79 */ 80 public static void pressText(String targetImg, String pressText, String fontName, int fontStyle, int fontSize, Color color, int x, int y, float alpha) { 81 try { 82 File file = new File(targetImg); 83 84 Image image = ImageIO.read(file); 85 int width = image.getWidth(null); 86 int height = image.getHeight(null); 87 BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); 88 Graphics2D g = bufferedImage.createGraphics(); 89 g.drawImage(image, 0, 0, width, height, null); 90 g.setFont(new Font(fontName, fontStyle, fontSize)); 91 g.setColor(color); 92 g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha)); 93 94 int width_1 = fontSize * getLength(pressText); 95 int height_1 = fontSize; 96 int widthDiff = width - width_1; 97 int heightDiff = height - height_1; 98 if(x < 0){ 99 x = widthDiff / 2;100 }else if(x > widthDiff){101 x = widthDiff;102 }103 if(y < 0){104 y = heightDiff / 2;105 }else if(y > heightDiff){106 y = heightDiff;107 }108 109 g.drawString(pressText, x, y + height_1);110 g.dispose();111 ImageIO.write(bufferedImage, PICTRUE_FORMATE_JPG, file);112 } catch (Exception e) {113 e.printStackTrace();114 }115 }116 117 /**118 * 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119 * @param text120 * @return 字符长度，如：text="中国",返回 2；text="test",返回 2；text="中国ABC",返回 4.121 */122 public static int getLength(String text) {123 int textLength = text.length();124 int length = textLength;125 for (int i = 0; i < textLength; i++) {126 if (String.valueOf(text.charAt(i)).getBytes().length > 1) {127 length++;128 }129 }130 return (length % 2 == 0) ? length / 2 : length / 2 + 1;131 }132 133 /**134 * 图片缩放135 * @param filePath 图片路径136 * @param height 高度137 * @param width 宽度138 * @param bb 比例不对时是否需要补白139 */140 public static void resize(String filePath, int height, int width, boolean bb) {141 try {142 double ratio = 0; //缩放比例 143 File f = new File(filePath); 144 BufferedImage bi = ImageIO.read(f); 145 Image itemp = bi.getScaledInstance(width, height, BufferedImage.SCALE_SMOOTH); 146 //计算比例 147 if ((bi.getHeight() > height) || (bi.getWidth() > width)) { 148 if (bi.getHeight() > bi.getWidth()) { 149 ratio = (new Integer(height)).doubleValue() / bi.getHeight(); 150 } else { 151 ratio = (new Integer(width)).doubleValue() / bi.getWidth(); 152 } 153 AffineTransformOp op = new AffineTransformOp(AffineTransform.getScaleInstance(ratio, ratio), null); 154 itemp = op.filter(bi, null); 155 } 156 if (bb) { 157 BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); 158 Graphics2D g = image.createGraphics(); 159 g.setColor(Color.white); 160 g.fillRect(0, 0, width, height); 161 if (width == itemp.getWidth(null)) 162 g.drawImage(itemp, 0, (height - itemp.getHeight(null)) / 2, itemp.getWidth(null), itemp.getHeight(null), Color.white, null); 163 else 164 g.drawImage(itemp, (width - itemp.getWidth(null)) / 2, 0, itemp.getWidth(null), itemp.getHeight(null), Color.white, null); 165 g.dispose(); 166 itemp = image; 167 }168 ImageIO.write((BufferedImage) itemp, "jpg", f); 169 } catch (IOException e) {170 e.printStackTrace();171 }172 }173 174 public static void main(String[] args) throws IOException {175 pressImage("C://pic//jpg", "C://pic//test.gif", 5000, 5000, 0f);176 pressText("C://pic//jpg", "旺仔之印", "宋体", Font.BOLD|Font.ITALIC, 20, Color.BLACK, 0, 0, 8f);177 resize("C://pic//4.jpg", 1000, 500, true);178 }179 }