java处理图片 添加文字或图片水印并可生成缩略图
ImageHelper.java
package com.test1433;import java.awt.AlphaComposite;import java.awt.Color;import java.awt.Font;import java.awt.Graphics2D;import java.awt.Image;import java.awt.RenderingHints;import java.awt.geom.AffineTransform;import java.awt.image.BufferedImage;import java.awt.image.ColorModel;import java.awt.image.WritableRaster;import java.io.File;import java.io.FileOutputStream;import javax.imageio.ImageIO;import com.sun.image.codec.jpeg.JPEGCodec;import com.sun.image.codec.jpeg.JPEGImageEncoder; public class ImageHelper { /** * 生成缩略图 <br/>保存:ImageIO.write(BufferedImage, imgType[jpg/png/...], File); * * @param source * 原图片 * @param width * 缩略图宽 * @param height * 缩略图高 * @param b * 是否等比缩放 * */public static BufferedImage Thumb(BufferedImage source, int width, int height, boolean b) {// targetW，targetH分别表示目标长和宽 int type = source.getType(); BufferedImage target = null; double sx = (double) width / source.getWidth(); double sy = (double) height / source.getHeight(); if (b) { if (sx > sy) { sx = sy; width = (int) (sx * source.getWidth()); } else { sy = sx; height = (int) (sy * source.getHeight()); } } if (type == BufferedImage.TYPE_CUSTOM) { // handmade ColorModel cm = source.getColorModel(); WritableRaster raster = cm.createCompatibleWritableRaster(width, height); boolean alphaPremultiplied = cm.isAlphaPremultiplied(); target = new BufferedImage(cm, raster, alphaPremultiplied, null); } else target = new BufferedImage(width, height, type); Graphics2D g = target.createGraphics();// smoother than exlax: g.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY); g.drawRenderedImage(source, AffineTransform.getScaleInstance(sx, sy)); g.dispose(); return target; } /** * 图片水印 * * @param imgPath * 待处理图片 * @param markPath * 水印图片 * @param x * 水印位于图片左上角的 x 坐标值 * @param y * 水印位于图片左上角的 y 坐标值 * @param alpha * 水印透明度 0.1f ~ 1.0f * */public static void waterMark(String imgPath, String markPath, int x, int y, float alpha) {try { // 加载待处理图片文件 Image img = ImageIO.read(new File(imgPath)); BufferedImage image = new BufferedImage(img.getWidth(null), img .getHeight(null), BufferedImage.TYPE_INT_RGB); Graphics2D g = image.createGraphics(); g.drawImage(img, 0, 0, null); // 加载水印图片文件 Image src_biao = ImageIO.read(new File(markPath)); g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha)); g.drawImage(src_biao, x, y, null); g.dispose(); // 保存处理后的文件 FileOutputStream out = new FileOutputStream(imgPath); JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out); encoder.encode(image); out.close(); } catch (Exception e) { e.printStackTrace(); }} /** * 文字水印 * * @param imgPath * 待处理图片 * @param text * 水印文字 * @param font * 水印字体信息 * @param color * 水印字体颜色 * @param x * 水印位于图片左上角的 x 坐标值 * @param y * 水印位于图片左上角的 y 坐标值 * @param alpha * 水印透明度 0.1f ~ 1.0f */ public static void textMark(String imgPath, String text, Font font, Color color, int x, int y, float alpha) { try { Font Dfont = (font == null) ? new Font("宋体", 20, 13) : font; Image img = ImageIO.read(new File(imgPath)); BufferedImage image = new BufferedImage(img.getWidth(null), img .getHeight(null), BufferedImage.TYPE_INT_RGB); Graphics2D g = image.createGraphics(); g.drawImage(img, 0, 0, null); g.setColor(color); g.setFont(Dfont); g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha)); g.drawString(text, x, y); g.dispose(); FileOutputStream out = new FileOutputStream(imgPath); JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out); encoder.encode(image); out.close(); } catch (Exception e) { System.out.println(e); } }}?测试代码
package com.test1433;import java.awt.Color;import java.awt.Font;public class TestPic {public static void main(String[] args) {Font font = new Font("宋体",50,60);Color color = new Color(0,0,0);ImageHelper.textMark("c://2012.jpg","http://www.baidu.com",font,color,20,40,1f);} }?