Java实现 图片水印或者文字水印，java实现水印文字,在原图之上再画一张图片(

Java实现 图片水印或者文字水印，java实现水印文字,在原图之上再画一张图片(

在原图之上再画一张图片(drawImage)或者文本文字(drawString)，JavaSE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;  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.OutputStream;  import javax.imageio.ImageIO;  import javax.swing.ImageIcon;  /**  * 生成图片水印  * @author Ricky Fung  *  */  public class WaterMarkIconTest {      /**      * @param args      */      public static void main(String[] args) {          File srcImageFile = new File("D:/test/myblog.png");          File logoImageFile = new File("D:/test/logo.png");          File outputImageFile = new File("D:/test/myblog_water_icon.jpg");          File outputRoateImageFile = new File("D:/test/myblog_water_icon_rotate.jpg");          createWaterMarkByIcon(srcImageFile, logoImageFile, outputImageFile);          createWaterMarkByIcon(srcImageFile, logoImageFile, outputRoateImageFile, 45);      }      public static void createWaterMarkByIcon(File srcImageFile, File logoImageFile,              File outputImageFile) {          createWaterMarkByIcon(srcImageFile, logoImageFile, outputImageFile, 0);      }      public static void createWaterMarkByIcon(File srcImageFile, File logoImageFile,              File outputImageFile, double degree) {          OutputStream os = null;          try {              Image srcImg = ImageIO.read(srcImageFile);              BufferedImage buffImg = new BufferedImage(srcImg.getWidth(null),                      srcImg.getHeight(null), BufferedImage.TYPE_INT_RGB);              Graphics2D g = buffImg.createGraphics();              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);              ImageIcon logoImgIcon = new ImageIcon(ImageIO.read(logoImageFile));              Image logoImg = logoImgIcon.getImage();              //旋转              if (degree>0) {                  g.rotate(Math.toRadians(degree),                          (double) buffImg.getWidth() / 2,                          (double) buffImg.getWidth() / 2);              }              float alpha = 0.8f; // 透明度              g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,                      alpha));              //水印 的位置              g.drawImage(logoImg, buffImg.getWidth()/3, buffImg.getHeight()/2, null);              g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER));              g.dispose();              os = new FileOutputStream(outputImageFile);              // 生成图片              ImageIO.write(buffImg, "JPG", os);          } catch (Exception e) {              e.printStackTrace();          } finally {              try {                  if (null != os)                      os.close();              } catch (Exception e) {                  e.printStackTrace();              }          }      }  }  

2.文字水印

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.OutputStream;  import javax.imageio.ImageIO;  /**  * 生成文字水印  * @author Ricky Fung  *  */  public class WaterMarkTextTest {      /**      * @param args      */      public static void main(String[] args) {          File srcImgFile = new File("D:/test/myblog.png");          String logoText = "[ 水印文字 电话邦   ]";          File outputImageFile = new File("D:/test/myblog_water_text.jpg");          File outputRotateImageFile = new File("D:/test/myblog_water_text_rotate.jpg");          createWaterMarkByText(srcImgFile, logoText, outputImageFile);          createWaterMarkByText(srcImgFile, logoText, outputRotateImageFile, 45);      }      public static void createWaterMarkByText(File srcImgFile, String logoText,              File outputImageFile) {          createWaterMarkByText(srcImgFile, logoText, outputImageFile, 0);      }      public static void createWaterMarkByText(File srcImgFile, String logoText,              File outputImageFile, double degree) {          OutputStream os = null;          try {              Image srcImg = ImageIO.read(srcImgFile);              BufferedImage buffImg = new BufferedImage(srcImg.getWidth(null),                      srcImg.getHeight(null), BufferedImage.TYPE_INT_RGB);              Graphics2D g = buffImg.createGraphics();              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 (degree>0) {                  g.rotate(Math.toRadians(degree),                          (double) buffImg.getWidth() / 2,                          (double) buffImg.getHeight() / 2);              }              g.setColor(Color.RED);              g.setFont(new Font("宋体", Font.BOLD, 36));              float alpha = 0.8f;              g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,                      alpha));              g.drawString(logoText, buffImg.getWidth()/3, buffImg.getHeight()/2);              g.dispose();              os = new FileOutputStream(outputImageFile);              // 生成图片              ImageIO.write(buffImg, "JPG", os);          } catch (Exception e) {              e.printStackTrace();          } finally {              try {                  if (null != os)                      os.close();              } catch (Exception e) {                  e.printStackTrace();              }          }      }  }