Java水印图片生成公共类

以下是本人实现的一个Java水印图片生成公共类:

package com.sunfairs.util; import java.awt.AlphaComposite; import java.awt.Font; import java.awt.Graphics2D; import java.awt.RenderingHints; import java.awt.geom.Rectangle2D; import java.awt.image.BufferedImage; import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import javax.imageio.ImageIO; import com.sun.image.codec.jpeg.JPEGCodec; import com.sun.image.codec.jpeg.JPEGEncodeParam; import com.sun.image.codec.jpeg.JPEGImageEncoder; public class WaterMarkerImageUtil { /** * 保存JPEG图片 * @param image 二进制图片对象 * @param imageFile 待保存的文件名称 * @param quality 待保存的图片质量 * @throws FileNotFoundException * @throws IOException */ public static void saveJPEGImage(BufferedImage image,File imageFile, int quality) throws FileNotFoundException,IOException{ BufferedOutputStream output = null; output = new BufferedOutputStream( new FileOutputStream(imageFile)); JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(output); JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(image); param.setQuality(quality/100F, false); encoder.setJPEGEncodeParam(param); encoder.encode(image); if(output != null){ output.close(); } } /** * 给图片加上水印文字 * @param imageFile 待处理的图片 * @param mark 待添加的水印文字 * @throws FileNotFoundException * @throws IOException */ public static void waterMarkImage(File imageFile,String mark) throws FileNotFoundException,IOException{ //读取图片 BufferedInputStream input = new BufferedInputStream( new FileInputStream(imageFile)); BufferedImage image = ImageIO.read(input); //给图片加水印效果 Graphics2D g2d = (Graphics2D) image.getGraphics(); int width = image.getWidth(); int height = image.getHeight(); Font font = new Font("Sans",Font.BOLD,24); Rectangle2D rectangle = font.getStringBounds(mark, g2d.getFontRenderContext()); if(width < rectangle.getWidth() + 6 || height < rectangle.getHeight() + 20) return; g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER,(float)0.8)); int x = width - (int)rectangle.getWidth() - 5; int y = height - 10; g2d.setFont(font); g2d.drawString(mark, x, y); //保存图片 String fileName = imageFile.getName(); int dotPosition = fileName.lastIndexOf("."); String newFile = fileName.substring(0, dotPosition) + "_waterMark" + fileName.substring(dotPosition); saveJPEGImage(image, new File(newFile), 100); } public static void main(String[] args) { try { File file = new File("E://圣火传递3.jpg"); waterMarkImage(file,"圣火传递3"); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } }