把做工程过程比较好的一些内容备份一下，如下内容段是关于 java生成缩略图类的内容。

package com.whatycms.common.util;

import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException;

import javax.imageio.ImageIO;

import org.apache.commons.io.FileUtils;

public class ImageScale { public static void resizeFix(File srcFile, File destFile, int width, int height) throws IOException { new ImageScale(srcFile, destFile, width, height); }

public static void resizeFix(BufferedImage bufImg, File destFile, int width, int height) throws IOException {new ImageScale(bufImg, destFile, width, height);
}private int width;
private int height;
private int zoomWidth;
private int zoomHeight;
private File destFile;
private BufferedImage srcBufferImage;protected ImageScale(File srcFile, File destFile, int zoomWidth, int zoomHeight) throws IOException {this.destFile = destFile;this.zoomWidth = zoomWidth;this.zoomHeight = zoomHeight;this.srcBufferImage = javax.imageio.ImageIO.read(srcFile);this.width = this.srcBufferImage.getWidth();this.height = this.srcBufferImage.getHeight();if (width <= zoomWidth && height <= zoomHeight) {FileUtils.copyFile(srcFile, destFile);} else {resizeFix();}
}protected ImageScale(BufferedImage srcBufferImage, File destFile, int zoomWidth, int zoomHeight) throws IOException {this.destFile = destFile;this.zoomWidth = zoomWidth;this.zoomHeight = zoomHeight;this.srcBufferImage = srcBufferImage;this.width = this.srcBufferImage.getWidth();this.height = this.srcBufferImage.getHeight();resizeFix();
}protected void resizeFix() throws IOException {if (width <= zoomWidth && height <= zoomHeight) {resize(width, height);} else if ((float) width / height > (float) zoomWidth / zoomHeight) {} else {}
}private void resize(int w, int h) throws IOException {BufferedImage imgBuf = scaleImage(w, h);File parent = destFile.getParentFile();if (!parent.exists()) {parent.mkdirs();}ImageIO.write(imgBuf, "jpeg", destFile);
}private BufferedImage scaleImage(int outWidth, int outHeight) {int[] rgbArray = srcBufferImage.getRGB(0, 0, width, height, null, 0, width);BufferedImage pbFinalOut = new BufferedImage(outWidth, outHeight, BufferedImage.TYPE_INT_RGB);int winX0, winY0, winX1, winY1;int valueRGB = 0;long R, G, B;int x, y, i, j;int n;for (y = 0; y < outHeight; y++) {if (winY0 < 0) {winY0 = 0;}winY1 = (int) (winY0 + vScale + 0.5);if (winY1 > height) {winY1 = height;}for (x = 0; x < outWidth; x++) {if (winX0 < 0) {winX0 = 0;}winX1 = (int) (winX0 + hScale + 0.5);if (winX1 > width) {winX1 = width;}R = 0;G = 0;B = 0;for (i = winX0; i < winX1; i++) {for (j = winY0; j < winY1; j++) {R += getRedValue(valueRGB);G += getGreenValue(valueRGB);B += getBlueValue(valueRGB);}}R = (int) (((double) R) / n + 0.5);G = (int) (((double) G) / n + 0.5);B = (int) (((double) B) / n + 0.5);valueRGB = comRGB(clip((int) R), clip((int) G), clip((int) B));pbFinalOut.setRGB(x, y, valueRGB);}}return pbFinalOut;
}private int clip(int x) {if (x < 0)return 0;if (x > 255)return 255;return x;
}private int getRedValue(int rgbValue) {int temp = rgbValue & 0x00ff0000;return temp >> 16;
}private int getGreenValue(int rgbValue) {int temp = rgbValue & 0x0000ff00;return temp >> 8;
}private int getBlueValue(int rgbValue) {return rgbValue & 0x000000ff;
}private int comRGB(int redValue, int greenValue, int blueValue) {return (redValue << 16) + (greenValue << 8) + blueValue;
}public static void main(String[] args) throws IOException {long start = System.currentTimeMillis();ImageScale.resizeFix(new File("D:/pictures/学会忘记.bmp"), new File("D:/pictures/学会忘记2.bmp"), 60, 60);long end = System.currentTimeMillis();System.out.println("success:" + (end - start));
}
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}