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Java实现 图片水印或者文字水印

2016-12-20 13:16| 发布者: zhangjf| 查看: 542| 评论: 0

摘要: 在原图之上再画一张图片(drawImage)或者文本文字(drawString)，Java SE中提供了 java.awt.image包和javax.imageio包可以实现非常方便的实现 图片水印或者文字水印。 1.图片水印 import java.awt.AlphaComposite; ...
在原图之上再画一张图片(drawImage)或者文本文字(drawString)，Java SE中提供了 java.awt.image包和javax.imageio包可以实现非常方便的实现 图片水印或者文字水印。

1.图片水印

  1. import java.awt.AlphaComposite;
  2. import java.awt.Graphics2D;
  3. import java.awt.Image;
  4. import java.awt.RenderingHints;
  5. import java.awt.image.BufferedImage;
  6. import java.io.File;
  7. import java.io.FileOutputStream;
  8. import java.io.OutputStream;
  9. import javax.imageio.ImageIO;
  10. import javax.swing.ImageIcon;
  12. /**
  13. * 生成图片水印
  14. * @author Ricky Fung
  15. *
  16. */
  17. public class WaterMarkIconTest {
  19. /**
  20. * @param args
  21. */
  22. public static void main(String[] args) {
  24. File srcImageFile = new File("D:/test/myblog.png");
  25. File logoImageFile = new File("D:/test/logo.png");
  27. File outputImageFile = new File("D:/test/myblog_water_icon.jpg");
  28. File outputRoateImageFile = new File("D:/test/myblog_water_icon_rotate.jpg");
  30. createWaterMarkByIcon(srcImageFile, logoImageFile, outputImageFile);
  32. createWaterMarkByIcon(srcImageFile, logoImageFile, outputRoateImageFile, 45);
  33. }
  35. public static void createWaterMarkByIcon(File srcImageFile, File logoImageFile,
  36. File outputImageFile) {
  37. createWaterMarkByIcon(srcImageFile, logoImageFile, outputImageFile, 0);
  38. }
  40. public static void createWaterMarkByIcon(File srcImageFile, File logoImageFile,
  41. File outputImageFile, double degree) {
  43. OutputStream os = null;
  44. try {
  45. Image srcImg = ImageIO.read(srcImageFile);
  47. BufferedImage buffImg = new BufferedImage(srcImg.getWidth(null),
  48. srcImg.getHeight(null), BufferedImage.TYPE_INT_RGB);
  50. Graphics2D g = buffImg.createGraphics();
  52. g.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
  53. RenderingHints.VALUE_INTERPOLATION_BILINEAR);
  55. g.drawImage(
  56. srcImg.getScaledInstance(srcImg.getWidth(null),
  57. srcImg.getHeight(null), Image.SCALE_SMOOTH), 0, 0,
  58. null);
  60. ImageIcon logoImgIcon = new ImageIcon(ImageIO.read(logoImageFile));
  62. Image logoImg = logoImgIcon.getImage();
  64. //旋转
  65. if (degree>0) {
  66. g.rotate(Math.toRadians(degree),
  67. (double) buffImg.getWidth() / 2,
  68. (double) buffImg.getWidth() / 2);
  69. }
  71. float alpha = 0.8f; // 透明度
  72. g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,
  73. alpha));
  75. //水印 的位置
  76. g.drawImage(logoImg, buffImg.getWidth()/3, buffImg.getHeight()/2, null);
  78. g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER));
  80. g.dispose();
  82. os = new FileOutputStream(outputImageFile);
  84. // 生成图片
  85. ImageIO.write(buffImg, "JPG", os);
  87. } catch (Exception e) {
  88. e.printStackTrace();
  89. } finally {
  90. try {
  91. if (null != os)
  92. os.close();
  93. } catch (Exception e) {
  94. e.printStackTrace();
  95. }
  96. }
  97. }
  99. }
复制代码

2.文字水印

  1. import java.awt.AlphaComposite;
  2. import java.awt.Color;
  3. import java.awt.Font;
  4. import java.awt.Graphics2D;
  5. import java.awt.Image;
  6. import java.awt.RenderingHints;
  7. import java.awt.image.BufferedImage;
  8. import java.io.File;
  9. import java.io.FileOutputStream;
  10. import java.io.OutputStream;
  11. import javax.imageio.ImageIO;
  13. /**
  14. * 生成文字水印
  15. * @author Ricky Fung
  16. *
  17. */
  18. public class WaterMarkTextTest {
  20. /**
  21. * @param args
  22. */
  23. public static void main(String[] args) {
  25. File srcImgFile = new File("D:/test/myblog.png");
  26. String logoText = "[ 水印文字 电话邦 ]";
  28. File outputImageFile = new File("D:/test/myblog_water_text.jpg");
  30. File outputRotateImageFile = new File("D:/test/myblog_water_text_rotate.jpg");
  32. createWaterMarkByText(srcImgFile, logoText, outputImageFile);
  34. createWaterMarkByText(srcImgFile, logoText, outputRotateImageFile, 45);
  35. }
  38. public static void createWaterMarkByText(File srcImgFile, String logoText,
  39. File outputImageFile) {
  40. createWaterMarkByText(srcImgFile, logoText, outputImageFile, 0);
  41. }
  43. public static void createWaterMarkByText(File srcImgFile, String logoText,
  44. File outputImageFile, double degree) {
  46. OutputStream os = null;
  47. try {
  48. Image srcImg = ImageIO.read(srcImgFile);
  50. BufferedImage buffImg = new BufferedImage(srcImg.getWidth(null),
  51. srcImg.getHeight(null), BufferedImage.TYPE_INT_RGB);
  53. Graphics2D g = buffImg.createGraphics();
  55. g.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
  56. RenderingHints.VALUE_INTERPOLATION_BILINEAR);
  58. g.drawImage(
  59. srcImg.getScaledInstance(srcImg.getWidth(null),
  60. srcImg.getHeight(null), Image.SCALE_SMOOTH), 0, 0,
  61. null);
  63. if (degree>0) {
  64. g.rotate(Math.toRadians(degree),
  65. (double) buffImg.getWidth() / 2,
  66. (double) buffImg.getHeight() / 2);
  67. }
  69. g.setColor(Color.RED);
  71. g.setFont(new Font("宋体", Font.BOLD, 36));
  73. float alpha = 0.8f;
  74. g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,
  75. alpha));
  77. g.drawString(logoText, buffImg.getWidth()/3, buffImg.getHeight()/2);
  79. g.dispose();
  81. os = new FileOutputStream(outputImageFile);
  83. // 生成图片
  84. ImageIO.write(buffImg, "JPG", os);
  86. } catch (Exception e) {
  87. e.printStackTrace();
  88. } finally {
  89. try {
  90. if (null != os)
  91. os.close();
  92. } catch (Exception e) {
  93. e.printStackTrace();
  94. }
  95. }
  96. }
  98. }
复制代码

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