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2024-08-09 7204e3dff0490732e861ccd1338e3e3c31d768c6

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a6a76f	1	package com.yc.utils;
F	2
	3	/**
	4	* 图片缩小算法，方形区域抽样 by alfred
	5	**/
	6
	7	import com.yc.servlet.BuildFormat;
	8
	9	import java.awt.*;
	10	import java.awt.image.BufferedImage;
	11	import java.io.File;
	12	import java.io.IOException;
	13
	14	public class NewScaleImage {
	15
	16	int width = 0;
	17	int height = 0;
	18	private String destFile;
	19	private String srcFileName;
	20	BufferedImage srcBufferImage;
	21	private int[] rgbArray = null;
	22
	23
	24	public NewScaleImage(File file) throws IOException {
	25	String srcFile = file.getName();
	26	srcFileName = file.getAbsolutePath();
	27	this.destFile = srcFile.substring(0, srcFile.lastIndexOf(".")) + ".jpg";
	28	try {
	29	srcBufferImage = javax.imageio.ImageIO.read(file);
	30	} catch (Exception e) {
	31	try {
	32	//设置默认图片
	33	String urlmr = file.getPath().substring(0, file.getPath().indexOf("WEB-INF"));
	34	if (file.getPath().indexOf(".") != -1) {
	35	String typeim = file.getPath().substring(file.getPath().indexOf("."), file.getPath().length());
	36	if (typeim.toLowerCase().indexOf("jpg") != -1) {
	37	urlmr = urlmr + "/smallpic/specialpic/jpg.jpg";
	38	} else if (typeim.toLowerCase().indexOf("png") != -1) {
	39	urlmr = urlmr + "/smallpic/specialpic/png.png";
	40	}
	41	}
	42	File file2 = new File(urlmr);
	43	srcBufferImage = javax.imageio.ImageIO.read(file2);
	44	} catch (Exception e3) {
	45	try {
	46	//图片溢出处理 2014-10-9
	47	Toolkit toolkit = Toolkit.getDefaultToolkit();
	48	Image srcImage = toolkit.getImage(file.getAbsolutePath()); // 构造Image对象
	49	int wideths = -1;
	50	int heights = -1;
	51	boolean flag = true;
	52	while (flag) {
	53	wideths = srcImage.getWidth(null); // 得到源图宽
	54	heights = srcImage.getHeight(null); // 得到源图长
	55	// System.out.println("wideth:" + wideths + " height:" + heights);
	56	if (wideths > 0 && heights > 0) { // 因为 Toolkit.getImage 是异步读取，如果
	57	// wideth 和 height
	58	// 都大于0，表明图片已经加载完毕
	59	// imageCanvas.setImage(srcImage);
	60	flag = false;
	61	} else {
	62	try {
	63	Thread.sleep(10);
	64	} catch (Exception e2) {
	65	e2.printStackTrace();
	66	}
	67	}
	68	}
	69	// 加载完毕，输出
	70	int w = 1024;
	71	float s = (float) wideths / 1024.0f;
	72	int h = (int) ((float) heights / s);
	73	BufferedImage bufferedImage = new BufferedImage(w, h,
	74	BufferedImage.TYPE_INT_RGB);
	75	srcBufferImage = bufferedImage;
	76	} catch (Exception e1) {
	77	e1.printStackTrace();
	78	}
	79
	80	}
	81	}
	82	width = srcBufferImage.getWidth();
	83	height = srcBufferImage.getHeight();
	84
	85	}
	86
	87	public BufferedImage scaleImage(int outWidth, int outHeight) {
	88
	89	rgbArray = srcBufferImage.getRGB(0, 0, width, height, null, 0, width);
	90	if (DetermineResultSize(outWidth, outHeight) == 1) {
	91	return srcBufferImage;
	92	}
	93	BufferedImage pbFinalOut = new BufferedImage(outWidth, outHeight,
	94	BufferedImage.TYPE_INT_RGB);
	95
	96	double hScale = ((double) width) / ((double) outWidth);//宽缩小的倍数
	97	double vScale = ((double) height) / ((double) outHeight);//高缩小的倍数
	98
	99	int winX0, winY0, winX1, winY1;
	100	int valueRGB = 0;
	101	long R, G, B;
	102	int x, y, i, j;
	103	int n;
	104	for (y = 0; y < outHeight; y++) {
	105	winY0 = (int) (y * vScale + 0.5);//得到原图高的Y坐标
	106	if (winY0 < 0) {
	107	winY0 = 0;
	108	}
	109	winY1 = (int) (winY0 + vScale + 0.5);
	110	if (winY1 > height) {
	111	winY1 = height;
	112	}
	113	for (x = 0; x < outWidth; x++) {
	114	winX0 = (int) (x * hScale + 0.5);
	115	if (winX0 < 0) {
	116	winX0 = 0;
	117	}
	118	winX1 = (int) (winX0 + hScale + 0.5);
	119	if (winX1 > width) {
	120	winX1 = width;
	121	}
	122	R = 0;
	123	G = 0;
	124	B = 0;
	125	for (i = winX0; i < winX1; i++) {
	126	for (j = winY0; j < winY1; j++) {
	127	valueRGB = rgbArray[width * j + i];
	128	R += GetRedValue(valueRGB);
	129	G += GetGreenValue(valueRGB);
	130	B += GetBlueValue(valueRGB);
	131	}
	132	}
	133	n = (winX1 - winX0) * (winY1 - winY0);
	134	R = (int) (((double) R) / n + 0.5);
	135	G = (int) (((double) G) / n + 0.5);
	136	B = (int) (((double) B) / n + 0.5);
	137	valueRGB = ComRGB(Clip((int) R), Clip((int) G), Clip((int) B));
	138	pbFinalOut.setRGB(x, y, valueRGB);
	139	}
	140	}
	141	return pbFinalOut;
	142	}
	143
	144	/**
	145	* 决定图像尺寸
	146	*/
	147	public int DetermineResultSize(int w, int h) {
	148	double scaleH, scaleV;
	149	scaleH = (double) w / (double) width;
	150	scaleV = (double) h / (double) height;
	151	// 判断一下scaleH，scaleV，不做放大操作
	152	if (scaleH >= 1.0 && scaleV >= 1.0) {
	153	return 1;
	154	}
	155	return 0;
	156
	157	} // end of DetermineResultSize()
	158
	159	int Clip(int x) {
	160	if (x < 0)
	161	return 0;
	162	if (x > 255)
	163	return 255;
	164	return x;
	165	}
	166
	167	private int GetRedValue(int rgbValue) {
	168	int temp = rgbValue & 0x00ff0000;
	169	return temp >> 16;
	170	}
	171
	172	private int GetGreenValue(int rgbValue) {
	173	int temp = rgbValue & 0x0000ff00;
	174	return temp >> 8;
	175	}
	176
	177	private int GetBlueValue(int rgbValue) {
	178	return rgbValue & 0x000000ff;
	179	}
	180
	181	private int ComRGB(int redValue, int greenValue, int blueValue) {
	182
	183	return (redValue << 16) + (greenValue << 8) + blueValue;
	184	}
	185
	186	public void resize(int w, int h) throws IOException {
	187
	188	File srcFile = new File(srcFileName);
	189	srcBufferImage = javax.imageio.ImageIO.read(srcFile);
	190	width = srcBufferImage.getWidth();
	191	height = srcBufferImage.getHeight();
	192	BufferedImage image = scaleImage(w, h);
	193	BuildFormat.createImage(destFile,image);
	194	//FileOutputStream out = new FileOutputStream(destFile);
	195	//JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
	196	//encoder.encode(_image);
	197	// out.close();
	198	}
	199
	200	public void resizeByWidth(int w) throws IOException {
	201	float h = ((float) height * w / width);
	202	resize(w, new Float(h).intValue());
	203	}
	204
	205
	206	public void resizeByHeight(int h) throws IOException {
	207	float w = ((float) width * h / height);
	208	resize(new Float(w).intValue(), h);
	209	}
	210
	211	public void resizeFix(int w, int h) throws IOException {
	212	if (width <= w && height <= h) {
	213	resize(width, height);
	214	return;
	215	}
	216
	217	if ((float) width / height > (float) w / h) {
	218	resizeByWidth(w);
	219	} else {
	220	resizeByHeight(h);
	221	}
	222	}
	223
	224	public BufferedImage scaleImgFix(int outW, int outH) {
	225	if (width <= outW && height <= outH) {
	226	return scaleImage(width, height);
	227	}
	228
	229	if ((float) width / height > (float) outW / outH) {
	230	return scaleImage(outW, getResizeHeight(outW));
	231
	232	} else {
	233	return scaleImage(getResizeWidth(outH), outH);
	234
	235	}
	236	}
	237
	238	// 如果图片的高小于宽,计算缩小后的高度.
	239	public int getResizeHeight(int w) {
	240	float h = ((float) height * w / width);
	241	return new Float(h).intValue();
	242	}
	243
	244	//如果图片的高大于宽,计算缩小后的宽度.
	245	public int getResizeWidth(int h) {
	246	float w = ((float) width * h / height);
	247	return new Float(w).intValue();
	248	}
	249
	250	public void setDestFile(String fileName) {
	251	destFile = fileName;
	252	}
	253
	254	public String getDestFile() {
	255	return destFile;
	256	}
	257
	258	public static void main(String[] args) {
	259	}
	260
	261	public String getSrcFileName() {
	262	return srcFileName;
	263	}
	264
	265	public void setSrcFileName(String srcFileName) {
	266	this.srcFileName = srcFileName;
	267	}
	268
	269
	270	}