用Java实现图片的缩放。
1.package com.test;
2.
3.import com.sun.image.codec.jpeg.JPEGImageEncoder;
4.import com.sun.image.codec.jpeg.JPEGCodec;
5.import com.sun.image.codec.jpeg.JPEGEncodeParam;
6.import javax.swing.*;
7.import java.io.File;
8.import java.io.FileOutputStream;
9.import java.io.IOException;
10.import java.awt.*;
11.import java.awt.image.BufferedImage;
12.import java.awt.image.Kernel;
13.import java.awt.image.ConvolveOp;
14.
15.public class ImageUtil {
16.
17. public static void resize(File originalFile, File resizedFile,
18. int newWidth, float quality) throws IOException {
19.
20. if (quality > 1) {
21. throw new IllegalArgumentException(
22. "Quality has to be between 0 and 1");
23. }
24.
25. ImageIcon ii = new ImageIcon(originalFile.getCanonicalPath());
26. Image i = ii.getImage();
27. Image resizedImage = null;
28.
29. int iWidth = i.getWidth(null);
30. int iHeight = i.getHeight(null);
31.
32. if (iWidth > iHeight) {
33. resizedImage = i.getScaledInstance(newWidth, (newWidth * iHeight)
34. / iWidth, Image.SCALE_SMOOTH);
35. } else {
36. resizedImage = i.getScaledInstance((newWidth * iWidth) / iHeight,
37. newWidth, Image.SCALE_SMOOTH);
38. }
39.
40. // This code ensures that all the pixels in the image are loaded.
41. Image temp = new ImageIcon(resizedImage).getImage();
42.
43. // Create the buffered image.
44. BufferedImage bufferedImage = new BufferedImage(temp.getWidth(null),
45. temp.getHeight(null), BufferedImage.TYPE_INT_RGB);
46.
47. // Copy image to buffered image.
48. Graphics g = bufferedImage.createGraphics();
49.
50. // Clear background and paint the image.
51. g.setColor(Color.white);
52. g.fillRect(0, 0, temp.getWidth(null), temp.getHeight(null));
53. g.drawImage(temp, 0, 0, null);
54. g.dispose();
55.
56. // Soften.
57. float softenFactor = 0.05f;
58. float[] softenArray = { 0, softenFactor, 0, softenFactor,
59. 1 - (softenFactor * 4), softenFactor, 0, softenFactor, 0 };
60. Kernel kernel = new Kernel(3, 3, softenArray);
61. ConvolveOp cOp = new ConvolveOp(kernel, ConvolveOp.EDGE_NO_OP, null);
62. bufferedImage = cOp.filter(bufferedImage, null);
63.
64. // Write the jpeg to a file.
65. FileOutputStream out = new FileOutputStream(resizedFile);
66.
67. // Encodes image as a JPEG data stream
68. JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
69.
70. JPEGEncodeParam param = encoder
71. .getDefaultJPEGEncodeParam(bufferedImage);
72.
73. param.setQuality(quality, true);
74.
75. encoder.setJPEGEncodeParam(param);
76. encoder.encode(bufferedImage);
77. } // Example usage
78.
79. public static void main(String[] args) throws IOException {
80.// File originalImage = new File("C:\\11.jpg");
81.// resize(originalImage, new File("c:\\11-0.jpg"),150, 0.7f);
82.// resize(originalImage, new File("c:\\11-1.jpg"),150, 1f);
83. File originalImage = new File("C:\\1207.gif");
84. resize(originalImage, new File("c:\\1207-0.jpg"),150, 0.7f);
85. resize(originalImage, new File("c:\\1207-1.jpg"),150, 1f);
86. }
87.}
88.
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