图片的一些压缩处理和操作

图片的一些处理和操作，其中包括验证码的图片处理，图片宽高处理等！

package com.victop.fsweb.utils;import java.awt.Canvas;import java.awt.Color;import java.awt.Font;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.Image;import java.awt.Rectangle;import java.awt.image.AreaAveragingScaleFilter;import java.awt.image.BufferedImage;import java.awt.image.FilteredImageSource;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.InputStream;import java.io.OutputStream;import java.io.Serializable;import java.util.Iterator;import java.util.Random;import javax.imageio.ImageIO;import javax.imageio.ImageReadParam;import javax.imageio.ImageReader;import javax.imageio.stream.ImageInputStream;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import com.sun.image.codec.jpeg.JPEGCodec;import com.sun.image.codec.jpeg.JPEGImageEncoder;/** * @see 处理图片的工具类 * @version 1.0 * */public class ImageTool implements Serializable {public static void main(String[] args) {bean.bringCode(null, null);// 生成随机的注册验证码bean.cut("D:\\opt\\", "/log/http_imgload2.jpg", 200, 100, 100, 100);// 裁剪图片bean.reduce("D:\\opt\\", "/log/http_imgload2.jpg", 500, 500, true);// 压缩图片bean.water("D:\\opt\\log\\http_imgload2.jpg", bean.outputFile);// 绘制水印bean.rotate("D:\\opt\\", "/log/http_imgload2.jpg", 90, null);// 旋转图片bean.zoom("D:\\opt\\", "/log/http_imgload2.jpg", 2, null);// 放大或缩小图片bean.fontImg("D:\\opt\\log\\http_imgload2.jpg", "中国", new Font("Atlantic Inline", Font.PLAIN, 18), Color.GREEN, 200, 100);// 把字符印到图片上}private static final long serialVersionUID = 1L;private String outputFile = "D:\\test\\aa.jpg";/** * @see 生成随机的注册验证码图像 * @param request * @param response * */public void bringCode(HttpServletRequest request, HttpServletResponse response) {try {int width = 65, height = 24;BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);Graphics graphics = image.getGraphics();// 获取图形上下文graphics.setColor(getRandColor(180, 250));// 设定背景色(最多色调255)graphics.fillRect(0, 0, width, height);graphics.setColor(Color.black);// 画边框graphics.drawRect(0, 0, width - 1, height - 1);String randCode = "";// 取随机产生的认证码for (int i = 0; i < 4; ++i) {// 4代表4位验证码,如果要生成更多位的认证码,则加大数值randCode += mapTable[(int) (mapTable.length * Math.random())];}graphics.setColor(Color.black);// 将认证码显示到图像中,如果要生成更多位的认证码,增加drawString语句graphics.setFont(new Font("Atlantic Inline", Font.PLAIN, 18));String str = randCode.substring(0, 1);graphics.drawString(str, 8, 17);str = randCode.substring(1, 2);graphics.drawString(str, 20, 15);str = randCode.substring(2, 3);graphics.drawString(str, 35, 18);str = randCode.substring(3, 4);graphics.drawString(str, 45, 15);Random rand = new Random();// 随机产生30个干扰点for (int i = 0; i < 30; i++) {int x = rand.nextInt(width);int y = rand.nextInt(height);graphics.drawOval(x, y, 1, 1);}graphics.dispose();// 释放图形上下文/**如果是做网页验证码，请使用这两行代码*///request.getSession().setAttribute("checkCode", randCode);// 认证码保存在session中//ImageIO.write(image, "JPEG", response.getOutputStream());// 输出图像到页面/**如果是生成文件，请使用这四行代码*/OutputStream output = new FileOutputStream(outputFile);ImageIO.write(image, "JPEG", output);output.flush();output.close();image.flush();} catch (Exception e) {e.printStackTrace();}}/** * @see 裁剪图片 * @param base 根目录 * @param imgPath 原图片路径(虚拟路径) * @param left 左边的起点 * @param top 顶部的起点 * @param width 要裁剪的宽度 * @param height 要裁剪的高度 * @return String * */@SuppressWarnings("unchecked")public String cut(String base, String imgPath, int left, int top, int width, int height) {try {String suffix = imgPath.substring(imgPath.lastIndexOf(".") + 1);//后缀名Iterator readers = ImageIO.getImageReadersByFormatName(suffix);// 取得图片读入器ImageReader reader = (ImageReader) readers.next();InputStream source = new FileInputStream(base + imgPath);// 取得图片读入流ImageInputStream input = ImageIO.createImageInputStream(source);reader.setInput(input, true);ImageReadParam param = reader.getDefaultReadParam();// 图片参数Rectangle rect = new Rectangle(left, top, width, height);//开始裁剪param.setSourceRegion(rect);BufferedImage image = reader.read(0, param);String newFile = getNewPath(imgPath);ImageIO.write(image, suffix, new File(base + newFile));image.flush();input.flush();input.close();source.close();return newFile;} catch (Exception e) {e.printStackTrace();}return "";}/** * @see 压缩图片 * @param base 根目录 * @param imgPath 要压缩的图片路径(虚拟路径) * @param width 压缩宽 * @param height 压缩高 * @param percentage 是否等比例压缩,true则宽高比自动调整 * @return String */public String reduce(String base, String imgPath, int width, int height, boolean percentage) {try {File srcfile = new File(base + imgPath);BufferedImage src = ImageIO.read(srcfile);if (percentage) {double rate1 = ((double) src.getWidth(null)) / (double) width + 0.1;double rate2 = ((double) src.getHeight(null)) / (double) height + 0.1;double rate = rate1 > rate2 ? rate1 : rate2;width = (int) (((double) src.getWidth(null)) / rate);height = (int) (((double) src.getHeight(null)) / rate);}BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);image.getGraphics().drawImage(src.getScaledInstance(width, height, Image.SCALE_AREA_AVERAGING), 0, 0, null);String newFile = getNewPath(imgPath);FileOutputStream out = new FileOutputStream(base + newFile);JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);encoder.encode(image);image.flush();out.flush();out.close();src.flush();return newFile;} catch (Exception ex) {ex.printStackTrace();}return "";}/** * @see 绘制水印 * @param imgPath 图片路径(物理路径) * @param waterPath 水印图片路径(物理路径) * */public void water(String imgPath, String waterPath) {try {String extend = imgPath.substring(imgPath.lastIndexOf("."));if (!".gif".toLowerCase().equals(extend)) {// 如果图片不是gif类型就加水印BufferedImage src = ImageIO.read(new File(imgPath));            int width = src.getWidth();            int height = src.getHeight();            BufferedImage water = ImageIO.read(new File(waterPath));            int waWidth = water.getWidth();            int waHeight = water.getHeight();            BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);            Graphics graph = image.createGraphics();            graph.drawImage(src, 0, 0, width, height, null);            if(height > waHeight * 2 && width > waWidth * 2) {            graph.drawImage(water, 0, height-waHeight, waWidth, waHeight, null);            graph.dispose();            OutputStream out = new FileOutputStream(imgPath);            JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);            encoder.encode(image);            out.flush();            out.close();            }            image.flush();            water.flush();            src.flush();}} catch (Exception e) {e.printStackTrace();}}/** * @see 旋转图片 * @param base 根目录 * @param imgPath 图片路径(虚拟路径) * @param angle 旋转角度(90为顺时针旋转,-90为逆时针旋转) * @param response 可以为null * @return */public String rotate(String base, String imgPath, int angle, HttpServletResponse response) {try {if (angle % 90 == 0) {File file = new File(base + imgPath);BufferedImage src = ImageIO.read(file);int width = src.getWidth();int height = src.getHeight();BufferedImage image = new BufferedImage(height, width, src.getColorModel().getTransparency());Graphics2D graphics2d = image.createGraphics();if (angle < 0){graphics2d.rotate(Math.toRadians(angle), width / 2, width / 2);}else{graphics2d.rotate(Math.toRadians(angle), height / 2, height / 2);}graphics2d.drawImage(src, 0, 0, null);graphics2d.dispose();String suffix = imgPath.substring(imgPath.lastIndexOf(".") + 1).toUpperCase();String newFile = getNewPath(imgPath);ImageIO.write(image, suffix, new File(base + newFile));if (null != response) {ImageIO.write(image, suffix, response.getOutputStream());}image.flush();src.flush();return newFile;}} catch (Exception e) {e.printStackTrace();}return "";}/** * @see 放大或缩小图片 * @param base 根目录 * @param imgPath 图片路径(虚拟路径) * @param ratio 放大或缩小的倍数(1倍不会改变原图) * @param response 可以为null * @return */public String zoom(String base, String imgPath, double ratio, HttpServletResponse response) {try {BufferedImage src = ImageIO.read(new File(base + imgPath));        int width = new Double(src.getWidth() * ratio).intValue();        int height = new Double(src.getHeight() * ratio).intValue();        AreaAveragingScaleFilter filter = new AreaAveragingScaleFilter(width, height);        FilteredImageSource source = new FilteredImageSource(src.getSource(), filter);        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_3BYTE_BGR);        Graphics graphics = image.createGraphics();        graphics.drawImage(new Canvas().createImage(source), 0, 0, null);        String suffix = imgPath.substring(imgPath.lastIndexOf(".") + 1).toUpperCase();        String newFile = getNewPath(imgPath);        ImageIO.write(image, suffix, new File(base + newFile));        if (null != response) {ImageIO.write(image, suffix, response.getOutputStream());}        image.flush();        src.flush();        return newFile;} catch (Exception e) {e.printStackTrace();}return "";}/** * @see 把字符印到图片上 * @param imgPath 图片路径(物理路径) * @param text 准备的字符 * @param font 字体样式 * @param color 字体颜色 * @param left 图片的x坐标 (印的位置) * @param top 图片的y坐标 (印的位置) * @return */public void fontImg(String imgPath, String text, Font font, Color color, int left, int top) {try {BufferedImage src = ImageIO.read(new File(imgPath));            int width = src.getWidth();            int height = src.getHeight();            BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);            Graphics graph = image.createGraphics();            graph.drawImage(src, 0, 0, width, height, null);            graph.setColor(color);            graph.setFont(font);            graph.drawString(text, left, top);            graph.dispose();            FileOutputStream out = new FileOutputStream(imgPath);            JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);            encoder.encode(image);            out.close();            image.flush();            src.flush();} catch (Exception e) {e.printStackTrace();}}// 给定范围获得一个随机颜色private Color getRandColor(int fc, int bc) {Random random = new Random();int r = fc + random.nextInt(bc - fc);int g = fc + random.nextInt(bc - fc);int b = fc + random.nextInt(bc - fc);return new Color(r, g, b);}// 根据原图片路径获得即将产生的路径private String getNewPath(String imgPath) {String filePrex = imgPath.substring(0, imgPath.lastIndexOf('.'));return filePrex + "0" + imgPath.substring(filePrex.length());}private char mapTable[] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9' };private static ImageTool bean = new ImageTool();/** * @see 以单例模式创建，获得对象实例 * @return Image */public static ImageTool getBean() {return bean; }}