周末在家上围脖,看到sina围脖上图片都有水印,想到Java有专门Image的处理包,同样应该可以实现水印功能,查了资料小试下来
发现java实现水印还是非常方便的,水印可以是图片或者文字,而且还可以选择不同的角度旋转呢,以后有需要可以写个代码批量处理自己的图片了。
本门目录:
图片水印
文字水印
[一]、图片水印
package michael.io.image;
import java.awt.AlphaComposite;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageDecoder;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
/**
* 图片水印
* @blog http://sjsky.iteye.com
* @author Michael
*/
public class ImageMarkLogoByIcon {
/**
* @param args
*/
public static void main(String[] args) {
String srcImgPath = "d:/test/michael/myblog_01.png";
String iconPath = "d:/test/michael/blog_logo.png";
String targerPath = "d:/test/michael/img_mark_icon.jpg";
String targerPath2 = "d:/test/michael/img_mark_icon_rotate.jpg";
// 给图片添加水印
ImageMarkLogoByIcon.markImageByIcon(iconPath, srcImgPath, targerPath);
// 给图片添加水印,水印旋转-45
ImageMarkLogoByIcon.markImageByIcon(iconPath, srcImgPath, targerPath2,
-45);
}
/**
* 给图片添加水印
* @param iconPath 水印图片路径
* @param srcImgPath 源图片路径
* @param targerPath 目标图片路径
*/
public static void markImageByIcon(String iconPath, String srcImgPath,
String targerPath) {
markImageByIcon(iconPath, srcImgPath, targerPath, null);
}
/**
* 给图片添加水印、可设置水印图片旋转角度
* @param iconPath 水印图片路径
* @param srcImgPath 源图片路径
* @param targerPath 目标图片路径
* @param degree 水印图片旋转角度
*/
public static void markImageByIcon(String iconPath, String srcImgPath,
String targerPath, Integer degree) {
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);
}
// 水印图象的路径 水印一般为gif或者png的,这样可设置透明度
ImageIcon imgIcon = new ImageIcon(iconPath);
// 得到Image对象。
Image img = imgIcon.getImage();
float alpha = 0.5f; // 透明度
g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,
alpha));
// 表示水印图片的位置
g.drawImage(img, 150, 300, null);
g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER));
g.dispose();
os = new FileOutputStream(targerPath);
// 生成图片
ImageIO.write(buffImg, "JPG", os);
System.out.println("图片完成添加Icon印章。。。。。。");
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (null != os)
os.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
原始图片myblog_01.jpg:
[img]http://dl.iteye.com/upload/attachment/540325/83a1d25d-f6fc-3811-a0ad-1ac9db1d3f4b.jpg
[/img]
水印图片blog_logo.png:
[img]
http://dl.iteye.com/upload/attachment/540327/9ad25442-c564-3ac9-bbc2-af385cd017d4.png
[/img]
添加水印后的效果图:
[img]
http://dl.iteye.com/upload/attachment/540329/812c74ce-8464-37a3-9abb-97cb59d9b63b.jpg
[/img]
水印图标旋转的效果图:
[img]
http://dl.iteye.com/upload/attachment/540331/c9cd8419-85a1-3d36-b543-75a596873aab.jpg
[/img]
[二]、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();
}
}
}
}
添加文字水印后的效果图如下:
[img]
http://dl.iteye.com/upload/attachment/540335/771e9a38-56bc-3bfb-bf59-a26c1e6e86ce.jpg
[/img]
文字旋转后的效果图如下:
[img]
http://dl.iteye.com/upload/attachment/540333/26c55ac2-1ecf-36a6-bd98-51c484ef1638.jpg
[/img]
原文出处:http://sjsky.iteye.com/blog/1154390