java 图片处理
1 /*2 * 图片处理类
3 */
4 package image;
5
6 import com.sun.image.codec.jpeg.JPEGCodec;
7 import com.sun.image.codec.jpeg.JPEGEncodeParam;
8 import com.sun.image.codec.jpeg.JPEGImageEncoder;
9 import java.awt.AlphaComposite;
10 import java.awt.Color;
11 import java.awt.Graphics2D;
12 import java.awt.Image;
13 import java.awt.Rectangle;
14 import java.awt.RenderingHints;
15 import java.awt.Transparency;
16 import java.awt.geom.Area;
17 import java.awt.geom.RoundRectangle2D;
18 import java.awt.image.BufferedImage;
19 import java.io.File;
20 import java.io.FileOutputStream;
21 import java.io.IOException;
22 import javax.imageio.ImageIO;
23
24 /**
25 *
26 * @author sanshizi
27 */
28 public class ImageUtil {
29
30 /**
31 * 针对高度与宽度进行等比缩放
32 *
33 * @param img
34 * @param maxSize 要缩放到的尺寸
35 * @param type 1:高度与宽度的最大值为maxSize进行等比缩放 , 2:高度与宽度的最小值为maxSize进行等比缩放
36 * @return
37 */
38 private static Image getScaledImage(BufferedImage img, int maxSize, int type) {
39 int w0 = img.getWidth();
40 int h0 = img.getHeight();
41 int w = w0;
42 int h = h0;
43 if (type == 1) {
44 w = w0 > h0 ? maxSize : (maxSize * w0 / h0);
45 h = w0 > h0 ? (maxSize * h0 / w0) : maxSize;
46 } else if (type == 2) {
47 w = w0 > h0 ? (maxSize * w0 / h0) : maxSize;
48 h = w0 > h0 ? maxSize : (maxSize * h0 / w0);
49 }
50 Image image = img.getScaledInstance(w, h, Image.SCALE_SMOOTH);
51 BufferedImage result = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);
52 Graphics2D g = result.createGraphics();
53 g.drawImage(image, 0, 0, null);//在适当的位置画出
54 return result;
55 }
56
57 /**
58 * 先按最小宽高为size等比例绽放, 然后图像居中抠出直径为size的圆形图像
59 *
60 * @param img
61 * @param size
62 * @return
63 */
64 private static BufferedImage getRoundedImage(BufferedImage img, int size) {
65 return getRoundedImage(img, size, size / 2, 2);
66 }
67
68 /**
69 * 先按最小宽高为size等比例绽放, 然后图像居中抠出半径为radius的圆形图像
70 *
71 * @param img
72 * @param size 要缩放到的尺寸
73 * @param radius 圆角半径
74 * @param type 1:高度与宽度的最大值为maxSize进行等比缩放 , 2:高度与宽度的最小值为maxSize进行等比缩放
75 * @return
76 */
77 private static BufferedImage getRoundedImage(BufferedImage img, int size, int radius, int type) {
78
79 BufferedImage result = new BufferedImage(size, size, BufferedImage.TYPE_INT_ARGB);
80 Graphics2D g = result.createGraphics();
81
82 //先按最小宽高为size等比例绽放, 然后图像居中抠出直径为size的圆形图像
83 Image fixedImg = getScaledImage(img, size, type);
84 g.drawImage(fixedImg, (size - fixedImg.getWidth(null)) / 2, (size - fixedImg.getHeight(null)) / 2, null);//在适当的位置画出
85
86 //圆角
87 if (radius > 0) {
88 RoundRectangle2D round = new RoundRectangle2D.Double(0, 0, size, size, radius * 2, radius * 2);
89 Area clear = new Area(new Rectangle(0, 0, size, size));
90 clear.subtract(new Area(round));
91 g.setComposite(AlphaComposite.Clear);
92
93 //抗锯齿
94 g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
95 g.fill(clear);
96 g.dispose();
97 }
98 return result;
99 }
100
101 /**
102 * 使用删除alpha值的方式去掉图像的alpha通道
103 *
104 * @param $image
105 * @return
106 */
107 protected static BufferedImage get24BitImage(BufferedImage $image) {
108 int __w = $image.getWidth();
109 int __h = $image.getHeight();
110 int[] __imgARGB = getRGBs($image.getRGB(0, 0, __w, __h, null, 0, __w));
111 BufferedImage __newImg = new BufferedImage(__w, __h, BufferedImage.TYPE_INT_RGB);
112 __newImg.setRGB(0, 0, __w, __h, __imgARGB, 0, __w);
113 return __newImg;
114 }
115
116 /**
117 * 使用绘制的方式去掉图像的alpha值
118 *
119 * @param $image
120 * @param $bgColor
121 * @return
122 */
123 protected static BufferedImage get24BitImage(BufferedImage $image, Color $bgColor) {
124 int $w = $image.getWidth();
125 int $h = $image.getHeight();
126 BufferedImage img = new BufferedImage($w, $h, BufferedImage.TYPE_INT_RGB);
127 Graphics2D g = img.createGraphics();
128 g.setColor($bgColor);
129 g.fillRect(0, 0, $w, $h);
130 g.drawRenderedImage($image, null);
131 g.dispose();
132 return img;
133 }
134
135 /**
136 * 将32位色彩转换成24位色彩（丢弃Alpha通道）
137 *
138 * @param $argb
139 * @return
140 */
141 public static int[] getRGBs(int[] $argb) {
142 int[] __rgbs = new int[$argb.length];
143 for (int i = 0; i < $argb.length; i++) {
144 __rgbs[i] = $argb[i] & 0xFFFFFF;
145 }
146 return __rgbs;
147 }
148
149 public static void toJPG(File img, File save, int size, int quality) throws IOException {
150 FileOutputStream out = new FileOutputStream(save);
151 JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
152
153 BufferedImage image = (BufferedImage) getRoundedImage(ImageIO.read(img), size, 0, 2);//默认无圆角
154
155 //如果图像是透明的，就丢弃Alpha通道
156 if (image.getTransparency() == Transparency.TRANSLUCENT) {
157 image = get24BitImage(image);
158 }
159
160 JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(image);//使用jpeg编码器
161 param.setQuality(1, true);//高质量jpg图片输出
162 encoder.encode(image, param);
163
164 out.close();
165 }
166
167 public static void toPNG(File img, File save, int size) throws IOException {
168 ImageIO.write((BufferedImage) getRoundedImage(ImageIO.read(img), size, 0, 2), "PNG", save);//默认无圆角
169 }
170
171 public static void main(String[] args) throws IOException {
172 File img = new File("e:\\Users\\rocky\\Desktop\\0\\IMG_0404.PNG");
173 File save = new File("e:\\Users\\rocky\\Desktop\\0\\zz.jpg");
174
175 toJPG(img, save, 250, 100);
176 }
177 }
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