图片格式转换收缩和添加水印工具
来源：互联网 发布：亿恩网络 编辑：程序博客网 时间：2024/05/18 14:45
一.图片收缩和添加水印工具类 ImageProcessUtils：
package com.ftk.eloan.framework.utils;import java.awt.AlphaComposite;import java.awt.Color;import java.awt.Font;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.Image;import java.awt.geom.AffineTransform;import java.awt.image.AffineTransformOp;import java.awt.image.BufferedImage;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import javax.imageio.ImageIO; /** * 图片工具类， 图片水印，文字水印，缩放，补白等 * @author Carl He */public final class ImageProcessUtils { /**图片格式：JPG*/ private static final String PICTRUE_FORMATE_JPG = "jpg"; /** * 缩小并转换格式 * * @param srcPath源路径 * @param destPath目标路径 * @param height目标高 * @param width * 目标宽 * @param formate * 文件格式 * @return * boolean flag = ImageProcessUtils.narrowAndFormateTransfer("E:\\我的图片/雨伞.jpg", "E:\\我的图片/雨伞.png", 400, 400, "png"); */ public static boolean narrowAndFormateTransfer(String srcPath, String destPath, int height, int width, String formate) { boolean flag = false; BufferedImage src =null; try { File file = new File(srcPath); File destFile = new File(destPath); if (!destFile.getParentFile().exists()) { destFile.getParentFile().mkdir(); } src = ImageIO.read(file); // 读入文件 Image image = src.getScaledInstance(width, height, Image.SCALE_DEFAULT); BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics g = tag.getGraphics(); g.drawImage(image, 0, 0, null); // 绘制缩小后的图 g.dispose(); flag = ImageIO.write(tag, formate, new FileOutputStream(destFile));// 输出到文件流 } catch (IOException e) { e.printStackTrace(); }finally { src.flush(); } return flag; } /** * 添加图片水印 * @param targetImg 目标图片路径，如：C://myPictrue//1.jpg * @param waterImg 水印图片路径，如：C://myPictrue//logo.png * @param x 水印图片距离目标图片左侧的偏移量，如果x<0, 则在正中间 * @param y 水印图片距离目标图片上侧的偏移量，如果y<0, 则在正中间 * @param alpha 透明度(0.0 -- 1.0, 0.0为完全透明，1.0为完全不透明) */ public final static void pressImage(String targetImg, String waterImg, int x, int y, float alpha) { try { File file = new File(targetImg); Image image = ImageIO.read(file); int width = image.getWidth(null); int height = image.getHeight(null); BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics2D g = bufferedImage.createGraphics(); g.drawImage(image, 0, 0, width, height, null); Image waterImage = ImageIO.read(new File(waterImg)); // 水印文件 int width_1 = waterImage.getWidth(null); int height_1 = waterImage.getHeight(null); g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha)); int widthDiff = width - width_1; int heightDiff = height - height_1; if(x < 0){ x = widthDiff / 2; }else if(x > widthDiff){ x = widthDiff; } if(y < 0){ y = heightDiff / 2; }else if(y > heightDiff){ y = heightDiff; } g.drawImage(waterImage, x, y, width_1, height_1, null); // 水印文件结束 g.dispose(); ImageIO.write(bufferedImage, PICTRUE_FORMATE_JPG, file); } catch (IOException e) { e.printStackTrace(); } } /** * 添加文字水印 * @param targetImg 目标图片路径，如：C://myPictrue//1.jpg * @param pressText 水印文字， 如：中国证券网 * @param fontName 字体名称， 如：宋体 * @param fontStyle 字体样式，如：粗体和斜体(Font.BOLD|Font.ITALIC) * @param fontSize 字体大小，单位为像素 * @param color 字体颜色 * @param x 水印文字距离目标图片左侧的偏移量，如果x<0, 则在正中间 * @param y 水印文字距离目标图片上侧的偏移量，如果y<0, 则在正中间 * @param alpha 透明度(0.0 -- 1.0, 0.0为完全透明，1.0为完全不透明) */ public static void pressText(String targetImg, String pressText, String fontName, int fontStyle, int fontSize, Color color, int x, int y, float alpha) { BufferedImage bufferedImage=null; try { File file = new File(targetImg); Image image = ImageIO.read(file); int width = 400; //image.getWidth(null); //update by zsy 压缩图片大小 int height = 310;//image.getHeight(null); bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics2D g = bufferedImage.createGraphics(); g.drawImage(image, 0, 0, width, height, null); g.setFont(new Font(fontName, fontStyle, fontSize)); g.setColor(color); g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha)); int width_1 = fontSize * getLength(pressText); int height_1 = fontSize; int widthDiff = width - width_1; int heightDiff = height - height_1; if(x < 0){ x = widthDiff / 2; }else if(x > widthDiff){ x = widthDiff; } if(y < 0){ y = heightDiff / 2; }else if(y > heightDiff){ y = heightDiff; } g.drawString(pressText, x, y + height_1); g.dispose(); ImageIO.write(bufferedImage, PICTRUE_FORMATE_JPG, file); } catch (Exception e) { e.printStackTrace(); }finally { bufferedImage.flush(); } } /** * 获取字符长度，一个汉字作为 1 个字符, 一个英文字母作为 0.5 个字符 * @param text * @return 字符长度，如：text="中国",返回 2；text="test",返回 2；text="中国ABC",返回 4. */ public static int getLength(String text) { int textLength = text.length(); int length = textLength; for (int i = 0; i < textLength; i++) { if (String.valueOf(text.charAt(i)).getBytes().length > 1) { length++; } } return (length % 2 == 0) ? length / 2 : length / 2 + 1; } /** * 图片缩放 * @param filePath 图片路径 * @param height 高度 * @param width 宽度 * @param bb 比例不对时是否需要补白 */ public static void resize(String filePath, int height, int width, boolean bb) { try { double ratio = 0; //缩放比例 File f = new File(filePath); BufferedImage bi = ImageIO.read(f); Image itemp = bi.getScaledInstance(width, height, BufferedImage.SCALE_SMOOTH); //计算比例 if ((bi.getHeight() > height) || (bi.getWidth() > width)) { if (bi.getHeight() > bi.getWidth()) { ratio = (new Integer(height)).doubleValue() / bi.getHeight(); } else { ratio = (new Integer(width)).doubleValue() / bi.getWidth(); } AffineTransformOp op = new AffineTransformOp(AffineTransform.getScaleInstance(ratio, ratio), null); itemp = op.filter(bi, null); } if (bb) { BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics2D g = image.createGraphics(); g.setColor(Color.white); g.fillRect(0, 0, width, height); if (width == itemp.getWidth(null)) g.drawImage(itemp, 0, (height - itemp.getHeight(null)) / 2, itemp.getWidth(null), itemp.getHeight(null), Color.white, null); else g.drawImage(itemp, (width - itemp.getWidth(null)) / 2, 0, itemp.getWidth(null), itemp.getHeight(null), Color.white, null); g.dispose(); itemp = image; } ImageIO.write((BufferedImage) itemp, "jpg", f); } catch (IOException e) { e.printStackTrace(); } } public static void main(String[] args) throws IOException { narrowAndFormateTransfer("D://empupload/emp/IMAGE/2017/8/7/201708071033346266.png","D://empupload/emp/IMAGE/2017/8/7/20170807103334621236.png",400,100,"png"); // pressImage("d://pic//4.jpg", "d://pic//test.jpg", -1, -1, 0.5f);// pressText("d://pic//2.jpg", "旺仔之印", "宋体", Font.BOLD|Font.ITALIC, 20, Color.BLACK, 0, 0, 0.4f); // pressText("d://pic//2.jpg", "旺仔之印", "宋体", Font.BOLD, 20, Color.RED, 0, 0, 0.7f); //resize("d://pic//4.jpg", 1000, 500, true); }}二.绘制验证码图片工具类 ImageUtils：
package com.ftk.eloan.framework.utils;import java.awt.Color;import java.awt.Font;import java.awt.Graphics;import java.awt.image.BufferedImage;import java.io.File;import java.io.FileOutputStream;import java.util.Random;import javax.imageio.ImageIO;import org.springframework.util.Base64Utils;public class ImageUtils {// 随机产生的字符串private static final String RANDOM_STRS = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";private static final String IMG_HEADER = "data:image/jpg;base64,";private static final String FONT_NAME = "Fixedsys";private static final int FONT_SIZE = 20;private Random random = new Random();private int width = 80;// 图片宽private int height = 25;// 图片高private int lineNum = 20;// 干扰线数量private int strNum = 4;// 随机产生字符数量/** * 生成随机图片 */public BufferedImage genRandomCodeImage(StringBuffer randomCode) {// BufferedImage类是具有缓冲区的Image类BufferedImage image = new BufferedImage(width, height,BufferedImage.TYPE_INT_BGR);// 获取Graphics对象,便于对图像进行各种绘制操作Graphics g = image.getGraphics();// 设置背景色// g.setColor(getRandColor(200, 250));g.setColor(new Color(240, 248, 255));g.fillRect(0, 0, width, height);// 设置干扰线的颜色g.setColor(getRandColor(110, 120));// 绘制干扰线for (int i = 0; i <= lineNum; i++) {drowLine(g);}// 绘制随机字符g.setFont(new Font(FONT_NAME, Font.ROMAN_BASELINE, FONT_SIZE));for (int i = 1; i <= strNum; i++) {randomCode.append(drowString(g, i));}g.dispose();return image;}/** * 给定范围获得随机颜色 */private Color getRandColor(int fc, int bc) {if (fc > 255)fc = 255;if (bc > 255)bc = 255;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);}/** * 绘制字符串 */private String drowString(Graphics g, int i) {g.setColor(Color.BLACK);String rand = String.valueOf(getRandomString(random.nextInt(RANDOM_STRS.length())));g.translate(random.nextInt(3), random.nextInt(3));g.drawString(rand, 13 * i, 16);return rand;}/** * 绘制干扰线 */private void drowLine(Graphics g) {int x = random.nextInt(width);int y = random.nextInt(height);int x0 = random.nextInt(16);int y0 = random.nextInt(16);g.drawLine(x, y, x + x0, y + y0);}/** * 获取随机的字符 */private String getRandomString(int num) {return String.valueOf(RANDOM_STRS.charAt(num));}public static String encodeImgToString(byte[] imgByte){return IMG_HEADER + Base64Utils.encodeToString(imgByte);}public static void main(String[] args) {ImageUtils tool = new ImageUtils();StringBuffer code = new StringBuffer();BufferedImage image = tool.genRandomCodeImage(code);System.out.println(">>> random code =: " + code);try {// 将内存中的图片通过流动形式输出到客户端ImageIO.write(image, "JPEG", new FileOutputStream(new File("/Users/wangchaochao/Desktop/random-code.jpg")));} catch (Exception e) {e.printStackTrace();}}}阅读全文
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