Java实现图片添加水印

参考别人的感觉挺好玩，还没仔细研究，先上代码。

 package WaterMark;

 import javax.imageio.ImageIO;
 import java.awt.*;
 import java.awt.image.BufferedImage;
 import java.io.File;
 import java.io.FileOutputStream;
 import java.io.OutputStream;

 /**
  * Created by zhengbin06 on 2017/2/5.
  */
 public class WaterMarkFont {
     /**
      * @param args
      */
     public static void main(String[] args) {

         File srcImgFile = new File("/Users/zhengbin/Downloads/2.jpg");
         String logoText = "www.cnblogs.com/zhengbin";

         File outputImageFile = new File("/Users/zhengbin/Downloads/2-1.jpg");

         File outputRotateImageFile = new File("/Users/zhengbin/Downloads/2-2.jpg");

         createWaterMarkByText(srcImgFile, logoText, outputImageFile);

         createWaterMarkByText(srcImgFile, logoText, outputRotateImageFile, 45);
     }

     public static void createWaterMarkByText(File srcImgFile, String logoText,
                                              File outputImageFile) {
         createWaterMarkByText(srcImgFile, logoText, outputImageFile, 0);
     }

     public static void createWaterMarkByText(File srcImgFile, String logoText,
                                              File outputImageFile, double degree) {
         OutputStream os = null;
         try {
             Image srcImg = ImageIO.read(srcImgFile);

             // 定义图像的宽高和图像类型
             BufferedImage buffImg = new BufferedImage(srcImg.getWidth(null),
                     srcImg.getHeight(null), BufferedImage.TYPE_INT_RGB);

             // 创建一个 Graphics2D，可以将它绘制到此 BufferedImage 中
             // Graphics2D，它是用于在 Java(tm) 平台上呈现二维形状、文本和图像的基础类。
             Graphics2D g = buffImg.createGraphics();

             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 (degree>0) {
                 // 旋转
                 // 将用角度表示的角转换为近似相等的用弧度表示的角
                 g.rotate(Math.toRadians(degree),
                         (double) buffImg.getWidth() / 2,
                         (double) buffImg.getHeight() / 2);
             }

             g.setColor(Color.RED);

             g.setFont(new Font("宋体", Font.BOLD, 36));

             float alpha = 0.8f;
             g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,
                     alpha));

             // 烙上水印
             g.drawString(logoText, buffImg.getWidth()/3, buffImg.getHeight()/2);

             // 释放此图形的上下文以及它使用的所有系统资源
             g.dispose();

             os = new FileOutputStream(outputImageFile);

             // 生成图片
             ImageIO.write(buffImg, "JPG", os);

         } catch (Exception e) {
             e.printStackTrace();
         } finally {
             try {
                 if (null != os)
                     os.close();
             } catch (Exception e) {
                 e.printStackTrace();
             }
         }
     }
 }