## 给图片加水印 --- ``` import java.awt.Color; import java.awt.Font; import java.awt.Graphics2D; import java.awt.Image; import java.awt.image.BufferedImage; import java.io.File; import java.io.FileOutputStream; import javax.imageio.ImageIO; /** * * @use java给图片添加水印文字 * @ProjectName stuff * @Author <a href="mailto:mhmyqn@qq.com">mumaoqiang</a></br> * @Date 2012-7-19 下午10:27:54 </br> * @FullName com.mmq.watermark.WaterMarkUtils.java </br> * @JDK 1.6.0 </br> * @Version 1.0 </br> */ public class WaterMarkUtils { /** * 图片添加水印 * @param srcImgPath 需要添加水印的图片的路径 * @param outImgPath 添加水印后图片输出路径 * @param markContentColor 水印文字的颜色 * @param waterMarkContent 水印的文字 */ public void mark(String srcImgPath, String outImgPath, Color markContentColor, String waterMarkContent) { try { // 读取原图片信息 File srcImgFile = new File(srcImgPath); Image srcImg = ImageIO.read(srcImgFile); int srcImgWidth = srcImg.getWidth(null); int srcImgHeight = srcImg.getHeight(null); // 加水印 BufferedImage bufImg = new BufferedImage(srcImgWidth, srcImgHeight, BufferedImage.TYPE_INT_RGB); Graphics2D g = bufImg.createGraphics(); g.drawImage(srcImg, 0, 0, srcImgWidth, srcImgHeight, null); //Font font = new Font("Courier New", Font.PLAIN, 12); Font font = new Font("宋体", Font.PLAIN, 50); g.setColor(markContentColor); //根据图片的背景设置水印颜色 g.setFont(font); int x = srcImgWidth - getWatermarkLength(waterMarkContent, g) - 3; int y = srcImgHeight - 3; //int x = (srcImgWidth - getWatermarkLength(watermarkStr, g)) / 2; //int y = srcImgHeight / 2; g.drawString(waterMarkContent, x, y); g.dispose(); // 输出图片 FileOutputStream outImgStream = new FileOutputStream(outImgPath); ImageIO.write(bufImg, "jpg", outImgStream); outImgStream.flush(); outImgStream.close(); } catch (Exception e) { e.printStackTrace(); } } /** * 获取水印文字总长度 * @param waterMarkContent 水印的文字 * @param g * @return 水印文字总长度 */ public int getWatermarkLength(String waterMarkContent, Graphics2D g) { return g.getFontMetrics(g.getFont()).charsWidth(waterMarkContent.toCharArray(), 0, waterMarkContent.length()); } public static void main(String[] args) { // 原图位置, 输出图片位置, 水印文字颜色, 水印文字 new WaterMarkUtils().mark("d:/postWatermark.jpg", "d:/afterWatermark.jpg", Color.red, "水印效果测试"); } } ```