luxury watches: Java图片加水印

2021-06-11

Java图片加水印

采用Java自带的Image IO

废话不多说，上菜

1. 文字水印

 1 import sun.font.FontDesignMetrics; 2  3 import javax.imageio.ImageIO; 4 import java.awt.*; 5 import java.awt.image.BufferedImage; 6 import java.io.File; 7 import java.io.FileOutputStream; 8 import java.io.IOException; 9 10 /**11  * @Author ChengJianSheng12  * @Date 2021/6/1013  */14 public class WatermarkUtil {15 16  public static void main(String[] args) throws IOException {17   addText("F:/1.jpeg", "我的梦想是成为火影");18  }19 20  /**21   * 加文字水印22   * @param srcPath 原文件路径23   * @param content 文字内容24   * @throws IOException25   */26  public static void addText(String srcPath, String content) throws IOException {27   // 读取原图片信息28   BufferedImage srcImage = ImageIO.read(new File(srcPath));29   int width = srcImage.getWidth();30   int height = srcImage.getHeight();31 32   // 创建画笔，设置绘图区域33   BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);34   Graphics2D g = bufferedImage.createGraphics();35   g.drawImage(srcImage, 0, 0, width, height, null);36 //  g.drawImage(srcImage.getScaledInstance(width, height, Image.SCALE_SMOOTH), 0, 0, null);37 38   g.setFont(new Font("宋体", Font.PLAIN, 32));39   g.setColor(Color.RED);40 41   // 计算文字长度42   int len = g.getFontMetrics(g.getFont()).charsWidth(content.toCharArray(), 0, content.length());43   FontDesignMetrics metrics = FontDesignMetrics.getMetrics(g.getFont());44   int len2 = metrics.stringWidth(content);45   System.out.println(len);46   System.out.println(len2);47 48   // 计算文字坐标49   int x = width - len - 10;50   int y = height - 20;51 //  int x = width - 2 * len;52 //  int y = height - 1 * len;53 54   g.drawString(content, x, y);55 56   g.dispose();57 58   // 输出文件59   FileOutputStream fos = new FileOutputStream("F:/2.png");60   ImageIO.write(bufferedImage, "png", fos);61   fos.flush();62   fos.close();63  }64 65 }

可以设置文字透明度

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

2. 旋转文字

 1 import sun.font.FontDesignMetrics; 2  3 import javax.imageio.ImageIO; 4 import java.awt.*; 5 import java.awt.geom.AffineTransform; 6 import java.awt.image.BufferedImage; 7 import java.io.File; 8 import java.io.FileOutputStream; 9 import java.io.IOException;10 11 /**12  * @Author ChengJianSheng13  * @Date 2021/6/1014  */15 public class WatermarkUtil {16 17  // 水印透明度18  private static final float alpha = 0.5f;19  // 水印文字字体20  private static final Font font = new Font("宋体", Font.BOLD, 30);21  // 水印文字颜色22  private static final Color color = Color.RED;23 24 25  public static void main(String[] args) throws IOException {26   addText("F:/1.jpeg", "图片由木叶村提供，仅供忍者联军使用！");27  }28 29  /**30   * 加文字水印31   * @param srcPath 原文件路径32   * @param content 文字内容33   * @throws IOException34   */35  public static void addText(String srcPath, String content) throws IOException {36   // 读取原图片信息37   BufferedImage srcImage = ImageIO.read(new File(srcPath));38   int width = srcImage.getWidth();39   int height = srcImage.getHeight();40 41   // 创建画笔，设置绘图区域42   BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);43   Graphics2D g = bufferedImage.createGraphics();44   g.drawImage(srcImage, 0, 0, width, height, null);45 //  g.drawImage(srcImage.getScaledInstance(width, height, Image.SCALE_SMOOTH), 0, 0, null);46 47   // 旋转文字48   AffineTransform affineTransform = g.getTransform();49   affineTransform.rotate(Math.toRadians(-30), 0, 0);50   Font rotatedFont = font.deriveFont(affineTransform);51 52   g.setFont(rotatedFont); // 字体53   g.setColor(color);  // 颜色54   g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha)); // 透明度55 56   // 计算文字长度57   int len = g.getFontMetrics(g.getFont()).charsWidth(content.toCharArray(), 0, content.length());58   FontDesignMetrics metrics = FontDesignMetrics.getMetrics(g.getFont());59   int len2 = metrics.stringWidth(content);60   System.out.println(len);61   System.out.println(len2);62 63   // 计算水印文字坐标64   int x = width/5;65   int y = height/3*2;66 67   g.drawString(content, x, y);68 69   g.dispose();70 71   // 输出文件72   FileOutputStream fos = new FileOutputStream("F:/2.png");73   ImageIO.write(bufferedImage, "png", fos);74   fos.flush();75   fos.close();76  }77 78 }

画矩形框

 1 import sun.font.FontDesignMetrics; 2  3 import javax.imageio.ImageIO; 4 import java.awt.*; 5 import java.awt.image.BufferedImage; 6 import java.io.File; 7 import java.io.FileOutputStream; 8 import java.io.IOException; 9 10 /**11  * @Author ChengJianSheng12  * @Date 2021/6/1013  */14 public class WatermarkUtil {15 16  // 水印透明度17  private static final float alpha = 0.5f;18  // 水印文字字体19  private static final Font font = new Font("宋体", Font.BOLD, 30);20  // 水印文字颜色21  private static final Color color = Color.RED;22 23 24  public static void main(String[] args) throws IOException {25   addText("F:/1.jpeg", "图片由木叶村提供，仅供忍者联军使用！");26  }27 28  /**29   * 加文字水印30   * @param srcPath 原文件路径31   * @param content 文字内容32   * @throws IOException33   */34  public static void addText(String srcPath, String content) throws IOException {35   // 读取原图片信息36   BufferedImage srcImage = ImageIO.read(new File(srcPath));37   int width = srcImage.getWidth();38   int height = srcImage.getHeight();39 40   // 创建画笔，设置绘图区域41   BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);42   Graphics2D g = bufferedImage.createGraphics();43   g.drawImage(srcImage, 0, 0, width, height, null);44 45   g.setFont(font); // 字体46   g.setColor(color); // 颜色47   g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha)); // 透明度48 49   // 计算文字宽高度50   FontDesignMetrics metrics = FontDesignMetrics.getMetrics(font);51   int textWidth = metrics.stringWidth(content); // 文字宽度52   int textHeight = metrics.getHeight(); // 文字高度53 54   // 计算文字坐标55   int x = (width - textWidth) / 2;56   int y = (height + textHeight) / 2;57   // 写文字58   g.drawString(content, x, y);59 60   // 画矩形61   int padding = 10; // 内边距62   g.drawRect(x - padding/2, y - textHeight, textWidth + padding, textHeight + padding);63 64   g.dispose();65 66   // 输出文件67   FileOutputStream fos = new FileOutputStream("F:/2.png");68   ImageIO.write(bufferedImage, "png", fos);69   fos.flush();70   fos.close();71  }72 73 }

3. 旋转坐标轴

 1 import sun.font.FontDesignMetrics; 2  3 import javax.imageio.ImageIO; 4 import java.awt.*; 5 import java.awt.image.BufferedImage; 6 import java.io.File; 7 import java.io.FileOutputStream; 8 import java.io.IOException; 9 10 /**11  * @Author ChengJianSheng12  * @Date 2021/6/1013  */14 public class WatermarkUtil {15 16  // 水印透明度17  private static final float alpha = 0.5f;18  // 水印文字字体19  private static final Font font = new Font("宋体", Font.BOLD, 30);20  // 水印文字颜色21  private static final Color color = Color.RED;22 23 24  public static void main(String[] args) throws IOException {25   addText("F:/1.jpeg", "图片由木叶村提供，仅供忍者联军使用！");26  }27 28  /**29   * 加文字水印30   * @param srcPath 原文件路径31   * @param content 文字内容32   * @throws IOException33   */34  public static void addText(String srcPath, String content) throws IOException {35   // 读取原图片信息36   BufferedImage srcImage = ImageIO.read(new File(srcPath));37   int width = srcImage.getWidth();38   int height = srcImage.getHeight();39 40   // 创建画笔，设置绘图区域41   BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);42   Graphics2D g = bufferedImage.createGraphics();43   g.drawImage(srcImage, 0, 0, width, height, null);44 45   g.setFont(font); // 字体46   g.setColor(color); // 颜色47   g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha)); // 透明度48 49   // 计算文字宽高度50   FontDesignMetrics metrics = FontDesignMetrics.getMetrics(font);51   int textWidth = metrics.stringWidth(content); // 文字宽度52   int textHeight = metrics.getHeight(); // 文字高度53 54   // 旋转坐标轴55   g.translate(-width/5, height/4);56   g.rotate(-30*Math.PI/180);57 58   // 计算文字坐标59   int x = (width - textWidth) / 2;60   int y = (height + textHeight) / 2;61   // 写文字62   g.drawString(content, x, y);63 64   // 画矩形65   int padding = 10; // 内边距66   g.drawRect(x - padding/2, y - textHeight, textWidth + padding, textHeight + padding);67 68   g.dispose();69 70   // 输出文件71   FileOutputStream fos = new FileOutputStream("F:/2.png");72   ImageIO.write(bufferedImage, "png", fos);73   fos.flush();74   fos.close();75  }76 77 }