Java图片缩放剪切处理：

Java图片缩放剪切处理：

1. package action;
3. import java.awt.Graphics;
4. import java.awt.Image;
5. import java.awt.Toolkit;
6. import java.awt.image.BufferedImage;
7. import java.awt.image.CropImageFilter;
8. import java.awt.image.FilteredImageSource;
9. import java.awt.image.ImageFilter;
10. import java.io.File;
11. import java.io.FileOutputStream;
12. import java.io.IOException;
14. import javax.imageio.ImageIO;
16. import com.sun.image.codec.jpeg.JPEGCodec;
17. import com.sun.image.codec.jpeg.JPEGImageEncoder;
19. public class ImageProcess {
21. /**
22. * 对图片进行缩放
23. *
24. * @param srcImgFileName
25. * @throws IOException
26. */
27. public void zoomImage(String srcImgFileName) throws IOException {
28. // 读入文件
29. File _file = new File(srcImgFileName);
30. // 构造Image对象
31. BufferedImage src = javax.imageio.ImageIO.read(_file);
32. int width = src.getWidth();
33. int height = src.getHeight();
35. // 边长缩小为二分之一
36. BufferedImage tag = new BufferedImage(width / 2, height / 2, BufferedImage.TYPE_INT_RGB);
37. // 绘制缩小后的图
38. tag.getGraphics().drawImage(src, 0, 0, width / 2, height / 2, null);
39. FileOutputStream out = new FileOutputStream("D:\\test1\\targetIMG1-4.jpg");
40. JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
41. encoder.encode(tag);
42. out.close();
44. // 边长扩大为2倍
45. tag = new BufferedImage(width * 2, height * 2, BufferedImage.TYPE_INT_RGB);
46. tag.getGraphics().drawImage(src, 0, 0, width * 2, height * 2, null);
47. out = new FileOutputStream("D:\\test1\\targetIMGx2.jpg");
48. encoder = JPEGCodec.createJPEGEncoder(out);
49. encoder.encode(tag);
50. out.close();
52. }
54. /**
55. * 将图片分成九块
56. *
57. * @param srcImageFile
58. * @throws IOException
59. */
60. public void cut(String srcImageFile) throws IOException {
61. Image img;
62. ImageFilter cropFilter;
63. String dir = null;
64. // 读取源图像
65. BufferedImage src = ImageIO.read(new File(srcImageFile));
66. int destWidth = src.getWidth() / 3;
67. int destHeight = src.getHeight() / 3;
68. // 循环
69. for (int i = 0; i < 3; i++) {
70. for (int j = 0; j < 3; j++) {
71. // 四个参数分别为图像起点坐标和宽高
72. cropFilter = new CropImageFilter(j * destWidth, i * destHeight, destWidth, destHeight);
73. img = Toolkit.getDefaultToolkit().createImage(newFilteredImageSource(src.getSource(), cropFilter));
74. BufferedImage tag = new BufferedImage(destWidth, destHeight, BufferedImage.TYPE_INT_RGB);
75. Graphics g = tag.getGraphics();
76. g.drawImage(img, 0, 0, null); // 绘制小图
77. g.dispose();
78. // 输出为文件
79. dir = "D:\\test1\\cut_image_" + i + "_" + j + ".jpg";
80. File f = new File(dir);
81. ImageIO.write(tag, "JPEG", f);
82. }
83. }
84. }
86. public static void main(String[] args) throws IOException {
87. String imgFileName = "D:\\test\\test.png";
88. ImageProcess iZoom = new ImageProcess();
90. iZoom.zoomImage(imgFileName);
91. iZoom.cut(imgFileName);
92. }
93. }