java图片添加水印实例代码分享

本文为大家介绍了java图片添加水印实例代码，java实现水印还是非常方便的，水印可以是图片或者文字，具体内容如下

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; 
 
 
public class ImageMarkLogoByIcon { 
 
  
 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); 
 
 } 
 
  
 public static void markImageByIcon(String iconPath, String srcImgPath, 
  String targerPath) { 
 markImageByIcon(iconPath, srcImgPath, targerPath, null); 
 } 
 
  
 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(); 
  } 
 } 
 } 
} 

再为大家分享一例：

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import javax.imageio.ImageIO;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
 
public final class ImageUtils {
 public ImageUtils() {
 
 }
 
 
 
 
 public final static void pressImage(String pressImg, String targetImg,
  int x, int y) {
 try {
  //目标文件
  File _file = new File(targetImg);
  Image src = ImageIO.read(_file);
  int wideth = src.getWidth(null);
  int height = src.getHeight(null);
  BufferedImage image = new BufferedImage(wideth, height,
   BufferedImage.TYPE_INT_RGB);
  Graphics g = image.createGraphics();
  g.drawImage(src, 0, 0, wideth, height, null);
 
  //水印文件
  File _filebiao = new File(pressImg);
  Image src_biao = ImageIO.read(_filebiao);
  int wideth_biao = src_biao.getWidth(null);
  int height_biao = src_biao.getHeight(null);
  g.drawImage(src_biao, (wideth - wideth_biao) / 2,
   (height - height_biao) / 2, wideth_biao, height_biao, null);
  //水印文件结束
  g.dispose();
  FileOutputStream out = new FileOutputStream(targetImg);
  JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
  encoder.encode(image);
  out.close();
 } catch (Exception e) {
  e.printStackTrace();
 }
 }
 
 
 
 public static void pressText(String pressText, String targetImg,
  String fontName, int fontStyle, int color, int fontSize, int x,
  int y) {
 try {
  File _file = new File(targetImg);
  Image src = ImageIO.read(_file);
  int wideth = src.getWidth(null);
  int height = src.getHeight(null);
  BufferedImage image = new BufferedImage(wideth, height,
   BufferedImage.TYPE_INT_RGB);
  Graphics g = image.createGraphics();
  g.drawImage(src, 0, 0, wideth, height, null);
  
  g.setColor(Color.RED);
  g.setFont(new Font(fontName, fontStyle, fontSize));
 
  g.drawString(pressText, wideth - fontSize - x, height - fontSize
   / 2 - y);
  g.dispose();
  FileOutputStream out = new FileOutputStream(targetImg);
  JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
  encoder.encode(image);
  out.close();
 } catch (Exception e) {
  System.out.println(e);
 }
 }
 
 public static void main(String[] args) {
 pressImage("F:/logo.png",  "F:/123.jpg", 0, 0);
 }
}

希望本文所述对大家用java语言实现图片添加水印有所帮助。