java.imageIo给图片添加水印的实现代码
作者：
最近项目在做一个商城项目, 项目上的图片要添加水印①,添加图片水印;②:添加文字水印;一下提供下个方法,希望大家可以用得着
复制代码 代码如下:
package com.blogs.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;
import javax.swing.ImageIcon;
/**
* 图片水印
*/
public class ImageUtil {
/**
* @param args
*/
public static void main(String[] args) {
String srcImgPath = "e:/2.png";
String iconPath = "e:\\logo.jpg";
String targerPath = "e:/3.jpg";
// 给图片添加水印
ImageUtil.waterMarkImageByIcon(iconPath, srcImgPath, targerPath, 0, 0,
, 0.1f);
// 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、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
* @param width
* 宽度(与左相比)
* @param height
* 高度(与顶相比)
* @param clarity
* 透明度(小于1的数)越接近0越透明
*/
public static void waterMarkImageByIcon(String iconPath, String srcImgPath,
String targerPath, Integer degree, Integer width, Integer height,
float clarity) {
OutputStream os = null;
try {
Image srcImg = ImageIO.read(new File(srcImgPath));
System.out.println("width:" + srcImg.getWidth(null));
System.out.println("height:" + srcImg.getHeight(null));
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 = clarity; // 透明度
g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,
alpha));
// 表示水印图片的位置
g.drawImage(img, width, height, 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("添加水印图片完成!");
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (null != os)
os.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
/**
* 给图片添加水印、可设置水印图片旋转角度
*
* @param logoText
* 水印文字
* @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
* @param width
* 宽度(与左相比)
* @param height
* 高度(与顶相比)
* @param clarity
* 透明度(小于1的数)越接近0越透明
*/
public static void waterMarkByText(String logoText, String srcImgPath,
String targerPath, Integer degree, Integer width, Integer height,
Float clarity) {
// 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 = clarity;
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, width, height);
g.dispose();
os = new FileOutputStream(targerPath);
// 生成图片
ImageIO.write(buffImg, "JPG", os);
System.out.println("添加水印文字完成!");
} 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();
}
}
}
}
还有一个图片缩放代码:
复制代码 代码如下:
/**
* 图片缩放(图片等比例缩放为指定大小，空白部分以白色填充)
*
* @param srcPath
* 源图片路径
* @param destPath
* 缩放后图片路径
*/
public static void zoomImage(String srcPath, String destPath, int destHeight, int destWidth) {
try {
BufferedImage srcBufferedImage = ImageIO.read(new File(srcPath));
int imgWidth = destWidth;
int imgHeight = destHeight;
int srcWidth = srcBufferedImage.getWidth();
int srcHeight = srcBufferedImage.getHeight();
if (srcHeight >= srcWidth) {
imgWidth = (int) Math.round(((destHeight * 1.0 / srcHeight) * srcWidth));
} else {
imgHeight = (int) Math.round(((destWidth * 1.0 / srcWidth) * srcHeight));
}
BufferedImage destBufferedImage = new BufferedImage(destWidth, destHeight, BufferedImage.TYPE_INT_RGB);
Graphics2D graphics2D = destBufferedImage.createGraphics();
graphics2D.setBackground(Color.WHITE);
graphics2D.clearRect(0, 0, destWidth, destHeight);
graphics2D.drawImage(srcBufferedImage.getScaledInstance(imgWidth, imgHeight, Image.SCALE_SMOOTH), (destWidth / 2) - (imgWidth / 2), (destHeight / 2) - (imgHeight / 2), null);
graphics2D.dispose();
ImageIO.write(destBufferedImage, "JPEG", new File(destPath));
} catch (IOException e) {
e.printStackTrace();
}
}