java图片处理(文字水印、图片水印、缩放、补白)

图片处理工具类
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 }
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