代碼如下：
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;
/**
* 圖片水印
*/
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";
// 給圖片添加水印
ImageUtil.waterMarkImageByIcon(iconPath, srcImgPath, targerPath, 0, 0,
, 0.1f);
// 給圖片添加水印,水印旋轉-45
// ImageMarkLogoByIcon.markImageByIcon(iconPath, srcImgPath,
// targerPath2, -45);
}
/**
* 給圖片添加水印、可設置水印圖片旋轉角度
*
* @param iconPath
* 水印圖片路徑
* @param srcImgPath
* 源圖片路徑
* @param targerPath
* 目標圖片路徑
* @param degree
* 水印圖片旋轉角度
* @param width
* 寬度(與左相比)
* @param height
* 高度(與頂相比)
* @param clarity
* 透明度(小於1的數)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);
// 得到畫筆對象
// Graphics g= buffImg.getGraphics();
Graphics2D g = buffImg.createGraphics();
// 設置對線段的鋸齒狀邊緣處理
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) {
// 設置水印旋轉
g.rotate(Math.toRadians(degree),
(double) buffImg.getWidth() / 2,
(double) buffImg.getHeight() / 2);
}
// 水印圖象的路徑 水印一般為gif或者png的，這樣可設置透明度
ImageIcon imgIcon = new ImageIcon(iconPath);
// 得到Image對象。
Image img = imgIcon.getImage();
float alpha = clarity; // 透明度
g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,
alpha));
// 表示水印圖片的位置
g.drawImage(img, width, height, null);
g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER));
g.dispose();
os = new FileOutputStream(targerPath);
// 生成圖片
ImageIO.write(buffImg, "JPG", os);
System.out.println("添加水印圖片完成!");
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (null != os)
os.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
/**
* 給圖片添加水印、可設置水印圖片旋轉角度
*
* @param logoText
* 水印文字
* @param srcImgPath
* 源圖片路徑
* @param targerPath
* 目標圖片路徑
* @param degree
* 水印圖片旋轉角度
* @param width
* 寬度(與左相比)
* @param height
* 高度(與頂相比)
* @param clarity
* 透明度(小於1的數)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) {
// 主圖片的路徑
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);
// 得到畫筆對象
// Graphics g= buffImg.getGraphics();
Graphics2D g = buffImg.createGraphics();
// 設置對線段的鋸齒狀邊緣處理
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) {
// 設置水印旋轉
g.rotate(Math.toRadians(degree),
(double) buffImg.getWidth() / 2,
(double) buffImg.getHeight() / 2);
}
// 設置顏色
g.setColor(Color.red);
// 設置 Font
g.setFont(new Font("宋體", Font.BOLD, 30));
float alpha = clarity;
g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,
alpha));
// 第一參數->設置的內容，後面兩個參數->文字在圖片上的坐標位置(x,y) .
g.drawString(logoText, width, height);
g.dispose();
os = new FileOutputStream(targerPath);
// 生成圖片
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();
}
}
}
}
還有一個圖片縮放代碼:
代碼如下：
/**
* 圖片縮放(圖片等比例縮放為指定大小，空白部分以白色填充)
*
* @param srcPath
* 源圖片路徑
* @param destPath
* 縮放後圖片路徑
*/
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();
}
}
