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 }
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
