java 缩略图__转

//-------------------------------------------------------------
package com.news.web;

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

import javax.imageio.ImageIO;

public class ImageScale {

	private int width;
	private int height;
	private int scaleWidth;
	double support = (double) 3.0;
	double PI = (double) 3.14159265358978;
	double[] contrib;
	double[] normContrib;
	double[] tmpContrib;
	int startContrib, stopContrib;
	int nDots;
	int nHalfDots;

	public BufferedImage imageZoomOut(BufferedImage srcBufferImage, int w, int h) {
		width = srcBufferImage.getWidth();
		height = srcBufferImage.getHeight();
		scaleWidth = w;

		if (DetermineResultSize(w, h) == 1) {
			return srcBufferImage;
		}
		CalContrib();
		BufferedImage pbOut = HorizontalFiltering(srcBufferImage, w);
		BufferedImage pbFinalOut = VerticalFiltering(pbOut, h);
		return pbFinalOut;
	}

	/**
	 * 决定图像尺寸
	 */
	private int DetermineResultSize(int w, int h) {
		double scaleH, scaleV;
		scaleH = (double) w / (double) width;
		scaleV = (double) h / (double) height;
		// 需要判断一下scaleH，scaleV，不做放大操作
		if (scaleH >= 1.0 && scaleV >= 1.0) {
			return 1;
		}
		return 0;

	} // end of DetermineResultSize()

	private double Lanczos(int i, int inWidth, int outWidth, double Support) {
		double x;

		x = (double) i * (double) outWidth / (double) inWidth;

		return Math.sin(x * PI) / (x * PI) * Math.sin(x * PI / Support)
				/ (x * PI / Support);

	} // end of Lanczos()

	//
	// Assumption: same horizontal and vertical scaling factor
	//
	private void CalContrib() {
		nHalfDots = (int) ((double) width * support / (double) scaleWidth);
		nDots = nHalfDots * 2 + 1;
		try {
			contrib = new double[nDots];
			normContrib = new double[nDots];
			tmpContrib = new double[nDots];
		} catch (Exception e) {
			System.out.println("init contrib,normContrib,tmpContrib" + e);
		}

		int center = nHalfDots;
		contrib[center] = 1.0;

		double weight = 0.0;
		int i = 0;
		for (i = 1; i <= center; i++) {
			contrib[center + i] = Lanczos(i, width, scaleWidth, support);
			weight += contrib[center + i];
		}

		for (i = center - 1; i >= 0; i--) {
			contrib[i] = contrib[center * 2 - i];
		}

		weight = weight * 2 + 1.0;

		for (i = 0; i <= center; i++) {
			normContrib[i] = contrib[i] / weight;
		}

		for (i = center + 1; i < nDots; i++) {
			normContrib[i] = normContrib[center * 2 - i];
		}
	} // end of CalContrib()

	// 处理边缘
	private void CalTempContrib(int start, int stop) {
		double weight = 0;

		int i = 0;
		for (i = start; i <= stop; i++) {
			weight += contrib[i];
		}

		for (i = start; i <= stop; i++) {
			tmpContrib[i] = contrib[i] / weight;
		}

	} // end of CalTempContrib()

	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;
	}

	// 行水平滤波
	private int HorizontalFilter(BufferedImage bufImg, int startX, int stopX,
			int start, int stop, int y, double[] pContrib) {
		double valueRed = 0.0;
		double valueGreen = 0.0;
		double valueBlue = 0.0;
		int valueRGB = 0;
		int i, j;

		for (i = startX, j = start; i <= stopX; i++, j++) {
			valueRGB = bufImg.getRGB(i, y);

			valueRed += GetRedValue(valueRGB) * pContrib[j];
			valueGreen += GetGreenValue(valueRGB) * pContrib[j];
			valueBlue += GetBlueValue(valueRGB) * pContrib[j];
		}

		valueRGB = ComRGB(Clip((int) valueRed), Clip((int) valueGreen),
				Clip((int) valueBlue));
		return valueRGB;

	} // end of HorizontalFilter()

	// 图片水平滤波
	private BufferedImage HorizontalFiltering(BufferedImage bufImage, int iOutW) {
		int dwInW = bufImage.getWidth();
		int dwInH = bufImage.getHeight();
		int value = 0;
		BufferedImage pbOut = new BufferedImage(iOutW, dwInH,
				BufferedImage.TYPE_INT_RGB);

		for (int x = 0; x < iOutW; x++) {

			int startX;
			int start;
			int X = (int) (((double) x) * ((double) dwInW) / ((double) iOutW) + 0.5);
			int y = 0;

			startX = X - nHalfDots;
			if (startX < 0) {
				startX = 0;
				start = nHalfDots - X;
			} else {
				start = 0;
			}

			int stop;
			int stopX = X + nHalfDots;
			if (stopX > (dwInW - 1)) {
				stopX = dwInW - 1;
				stop = nHalfDots + (dwInW - 1 - X);
			} else {
				stop = nHalfDots * 2;
			}

			if (start > 0 || stop < nDots - 1) {
				CalTempContrib(start, stop);
				for (y = 0; y < dwInH; y++) {
					value = HorizontalFilter(bufImage, startX, stopX, start,
							stop, y, tmpContrib);
					pbOut.setRGB(x, y, value);
				}
			} else {
				for (y = 0; y < dwInH; y++) {
					value = HorizontalFilter(bufImage, startX, stopX, start,
							stop, y, normContrib);
					pbOut.setRGB(x, y, value);
				}
			}
		}

		return pbOut;

	} // end of HorizontalFiltering()

	private int VerticalFilter(BufferedImage pbInImage, int startY, int stopY,
			int start, int stop, int x, double[] pContrib) {
		double valueRed = 0.0;
		double valueGreen = 0.0;
		double valueBlue = 0.0;
		int valueRGB = 0;
		int i, j;

		for (i = startY, j = start; i <= stopY; i++, j++) {
			valueRGB = pbInImage.getRGB(x, i);

			valueRed += GetRedValue(valueRGB) * pContrib[j];
			valueGreen += GetGreenValue(valueRGB) * pContrib[j];
			valueBlue += GetBlueValue(valueRGB) * pContrib[j];
			// System.out.println(valueRed+"->"+Clip((int)valueRed)+"<-");
			//
			// System.out.println(valueGreen+"->"+Clip((int)valueGreen)+"<-");
			//System.out.println(valueBlue+"->"+Clip((int)valueBlue)+"<-"+"-->")
			// ;
		}

		valueRGB = ComRGB(Clip((int) valueRed), Clip((int) valueGreen),
				Clip((int) valueBlue));
		// System.out.println(valueRGB);
		return valueRGB;

	} // end of VerticalFilter()

	private BufferedImage VerticalFiltering(BufferedImage pbImage, int iOutH) {
		int iW = pbImage.getWidth();
		int iH = pbImage.getHeight();
		int value = 0;
		BufferedImage pbOut = new BufferedImage(iW, iOutH,
				BufferedImage.TYPE_INT_RGB);

		for (int y = 0; y < iOutH; y++) {

			int startY;
			int start;
			int Y = (int) (((double) y) * ((double) iH) / ((double) iOutH) + 0.5);

			startY = Y - nHalfDots;
			if (startY < 0) {
				startY = 0;
				start = nHalfDots - Y;
			} else {
				start = 0;
			}

			int stop;
			int stopY = Y + nHalfDots;
			if (stopY > (int) (iH - 1)) {
				stopY = iH - 1;
				stop = nHalfDots + (iH - 1 - Y);
			} else {
				stop = nHalfDots * 2;
			}

			if (start > 0 || stop < nDots - 1) {
				CalTempContrib(start, stop);
				for (int x = 0; x < iW; x++) {
					value = VerticalFilter(pbImage, startY, stopY, start, stop,
							x, tmpContrib);
					pbOut.setRGB(x, y, value);
				}
			} else {
				for (int x = 0; x < iW; x++) {
					value = VerticalFilter(pbImage, startY, stopY, start, stop,
							x, normContrib);
					pbOut.setRGB(x, y, value);
				}
			}

		}

		return pbOut;

	} // end of VerticalFiltering()

	int Clip(int x) {
		if (x < 0)
			return 0;
		if (x > 255)
			return 255;
		return x;
	}

	public static void main(String[] args) throws Exception{
		
		BufferedImage im = ImageIO.read(new File("d:\\1.jpg"));
		BufferedImage image2 = new ImageScale().imageZoomOut(im,100,100);
		ImageIO.write(image2, "JPEG", new File("d:\\2.jpg"));
		
		
		
	}

}

//---------------------------------------------------------------


package com.news.web;

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

import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class ImageServlet2
 */
public class ImageServlet2 extends HttpServlet {
	private static final long serialVersionUID = 1L;
    public ImageServlet2() {
    }

	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
          doPost(request,response);
	}

	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		response.setHeader( "Cache-Control", "no-store");
		response.setHeader( "Pragma", "no-cache");
		response.setDateHeader( "Expires", 0);
		response.setContentType( "image/jpeg");
		
		// 图片放在当前应用的images目录下 如 http://www.xxx.com/ 下的文件目录。
		//String path = getServletContext().getRealPath( "images/2.jpg");
		String path = "d:\\1.jpg";
		BufferedImage image1 = ImageIO.read(new File(path));
	//	
		
		//ImageIO.write(image1, "jpeg", response.getOutputStream());

		int w = Integer.parseInt(request.getParameter("w"));
		int h = Integer.parseInt(request.getParameter("h"));

		
		ImageScale is = new ImageScale();
		//}
		BufferedImage image2 = is.imageZoomOut(image1, w, h);
		ImageIO.write(image2, "jpeg", response.getOutputStream());	
	}

}

//-----------------------------------------------------------------

     <servlet>
     	<servlet-name>ImageServlet2</servlet-name>
     	<servlet-class>
     	com.news.web.ImageServlet2</servlet-class>
     </servlet>
     <servlet-mapping>
     	<servlet-name>ImageServlet2</servlet-name>
     	<url-pattern>/ImageServlet2</url-pattern>
     </servlet-mapping>
//-------------------------------------------------------






<%@ page language="java" contentType="text/html; charset=GB18030"
    pageEncoding="GB18030"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB18030">
<title>Insert title here</title>
</head>
<body>
　　　　 <img src="ImageServlet2?w=100&h=100" />
　　　　 <img src="ImageServlet2?w=200&h=200" />
　　　　 <img src="ImageServlet2?w=150&h=100" />

</body>
</html>