java图片处理 (文字水印、图片水印、缩放、补白)
1 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 text
120 * @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 }
转自http://blog.csdn.net/hemingwang0902/article/details/4337419
