【java】学习--水印

---------------图片水印----------------------------------------

java 图片加水印,设置透明度

图片缩放

----------------文字水印----------------------------------------

package michael.io.image; 
 
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.image.BufferedImage; 
import java.io.File; 
import java.io.FileOutputStream; 
import java.io.InputStream; 
import java.io.OutputStream; 
 
import javax.imageio.ImageIO; 
 
/**
 * 文字水印
 * @blog http://sjsky.iteye.com
 * @author Michael
 */ 
public class ImageMarkLogoByText { 
 
    /**
     * @param args
     */ 
    public static void main(String[] args) { 
        String srcImgPath = "d:/test/michael/myblog_01.jpg"; 
        String logoText = "[ 测试文字水印 http://sjsky.iteye.com ]"; 
        String targerPath = "d:/test/michael/img_mark_text.jpg"; 
 
        String targerPath2 = "d:/test/michael/img_mark_text_rotate.jpg"; 
 
        // 给图片添加水印 
        ImageMarkLogoByText.markByText(logoText, srcImgPath, targerPath); 
 
        // 给图片添加水印,水印旋转-45 
        ImageMarkLogoByText.markByText(logoText, srcImgPath, targerPath2, -45); 
    } 
 
    /**
     * 给图片添加水印
     * @param logoText
     * @param srcImgPath
     * @param targerPath
     */ 
    public static void markByText(String logoText, String srcImgPath, 
            String targerPath) { 
        markByText(logoText, srcImgPath, targerPath, null); 
    } 
 
    /**
     * 给图片添加水印、可设置水印的旋转角度
     * @param logoText
     * @param srcImgPath
     * @param targerPath
     * @param degree
     */ 
    public static void markByText(String logoText, String srcImgPath, 
            String targerPath, Integer degree) { 
        // 主图片的路径 
        InputStream is = null; 
        OutputStream os = null; 
        try { 
            Image srcImg = ImageIO.read(new File(srcImgPath)); 
 
            BufferedImage buffImg = new BufferedImage(srcImg.getWidth(null), 
                    srcImg.getHeight(null), BufferedImage.TYPE_INT_RGB); 
 
            // 得到画笔对象 
            // Graphics g= buffImg.getGraphics(); 
            Graphics2D g = buffImg.createGraphics(); 
 
            // 设置对线段的锯齿状边缘处理 
            g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, 
                    RenderingHints.VALUE_INTERPOLATION_BILINEAR); 
 
            g.drawImage(srcImg.getScaledInstance(srcImg.getWidth(null), srcImg 
                    .getHeight(null), Image.SCALE_SMOOTH), 0, 0, null); 
 
            if (null != degree) { 
                // 设置水印旋转 
                g.rotate(Math.toRadians(degree), 
                        (double) buffImg.getWidth() / 2, (double) buffImg 
                                .getHeight() / 2); 
            } 
 
            // 设置颜色 
            g.setColor(Color.red); 
 
            // 设置 Font 
            g.setFont(new Font("宋体", Font.BOLD, 30)); 
 
            float alpha = 0.5f; 
            g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, 
                    alpha)); 
 
            // 第一参数->设置的内容，后面两个参数->文字在图片上的坐标位置(x,y) . 
            g.drawString(logoText, 150, 300); 
 
            g.dispose(); 
 
            os = new FileOutputStream(targerPath); 
 
            // 生成图片 
            ImageIO.write(buffImg, "JPG", os); 
 
            System.out.println("图片完成添加文字印章。。。。。。"); 
        } catch (Exception e) { 
            e.printStackTrace(); 
        } finally { 
            try { 
                if (null != is) 
                    is.close(); 
            } catch (Exception e) { 
                e.printStackTrace(); 
            } 
            try { 
                if (null != os) 
                    os.close(); 
            } catch (Exception e) { 
                e.printStackTrace(); 
            } 
        } 
    } 
}