图片加水印(学习笔记)

import java.io.OutputStream;


/**
 *
 * @接口
 */
public interface IImageWatermark {
    void  watermark();
    void  setOutputStream(OutputStream out);
}

 

import java.awt.AlphaComposite;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;

/**
 *
 * @author Administrator
 * LOGO水印
 */
public class IconImageWatermark implements IImageWatermark {

    private Integer degree;
    private Image image;
    private ImageIcon icon;
    private float alpha=1f;
    
    private OutputStream out;
    
    public IconImageWatermark(Image image, ImageIcon icon) {
        this(image, icon, null,1f);
    }

    public IconImageWatermark(Image image, ImageIcon icon, Integer degree,float alpha) {
        this.image = image;
        this.icon = icon;
        this.degree = degree;
        this.alpha=alpha;
    }

    @Override
    public void watermark() {
        if (this.image == null) {
            throw new NullPointerException("image is null");
        }

        if (this.icon == null) {
            throw new NullPointerException("icon is null");
        }
        
        int width=this.image.getWidth(null);
        int height=this.image.getHeight(null);
        
        //创建访问图像数据缓冲区
        BufferedImage buffer=new BufferedImage(width, height,BufferedImage.TYPE_INT_BGR);
        
        //创建一个 Graphics2D 图表
        Graphics2D  grap=buffer.createGraphics();
        
        // 设置对线段的锯齿状边缘处理 
        grap.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
        
        //绘制指定图像
        grap.drawImage(image.getScaledInstance(width, height, Image.SCALE_SMOOTH), 0, 0, null);
        
        
        //设置水印旋转
        if(degree!=null){
            grap.rotate(Math.toRadians(degree), Double.valueOf(width/2),Double.valueOf(height/2));
        }
        
        //组合绘图，并设定透明
        grap.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,this.alpha));
        
        //绘制一个水印
        int x=(width-icon.getImage().getWidth(null))/2;
        int y=(height-10)-icon.getImage().getHeight(null);
        
        grap.drawImage(icon.getImage(),x,y, null);
        
        
        //组合结束
        grap.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER));
        
        //释放此图形的上下文以及它使用的所有系统资源
        grap.dispose();
        try {
            ImageIO.write(buffer, "JPG", out);
        } catch (IOException ex) {
            Logger.getLogger(IconImageWatermark.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
    
    @Override
    public void setOutputStream(OutputStream out) {
        this.out = out;
    }

    public float getAlpha() {
        return alpha;
    }

    public void setAlpha(float alpha) {
        this.alpha = alpha;
    }

    public Integer getDegree() {
        return degree;
    }

    public void setDegree(Integer degree) {
        this.degree = degree;
    }
    
    
    
    
}

  

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.IOException;
import java.io.OutputStream;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.imageio.ImageIO;

/**
 *
 * @author Administrator
 */
public class StringImageWatermark implements IImageWatermark {

    private Image image;
    private String water;
    private Integer degree;
    private float alpha;
    
    private OutputStream os;
    public StringImageWatermark(Image image, String water) {
        this(image, water, null, 1f);
    }

    public StringImageWatermark(Image image, String water, Integer degree, float alpha) {
        this.image = image;
        this.water = water;
        this.degree = degree;
        this.alpha = alpha;
    }

    @Override
    public void watermark() {
        if(image==null){
            throw new NullPointerException("image is null");
        }
        
        int width=image.getWidth(null);
        int height=image.getHeight(null);
        
        BufferedImage buffered=new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);
        
        Graphics2D  graph=buffered.createGraphics();
        
        graph.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
        
        graph.drawImage(image.getScaledInstance(width, height, Image.SCALE_SMOOTH), 0,0, null);
        
        if(degree!=null){
            graph.rotate(degree, Double.valueOf(width/2),Double.valueOf(height/2));
        }
        
        graph.setColor(Color.RED);
        
        graph.setFont(new Font("宋体",Font.BOLD,30));
        graph.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha));
        
        int x= (width-water.length()*30)/2;
        int y=height-30;
        graph.drawString(water,x,y);
        
//        graph.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER));
        
        graph.dispose();
        try {
            ImageIO.write(buffered, "jpg", os);
        } catch (IOException ex) {
            Logger.getLogger(StringImageWatermark.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    @Override
    public void setOutputStream(OutputStream out) {
        this.os=out;
    }

    public float getAlpha() {
        return alpha;
    }

    public void setAlpha(float alpha) {
        this.alpha = alpha;
    }

    public Integer getDegree() {
        return degree;
    }

    public void setDegree(Integer degree) {
        this.degree = degree;
    }
    
    
}

 

import java.io.IOException;
import java.io.OutputStream;

/**
 *
 * @author Administrator
 */
public class WatermarkContext {

    private IImageWatermark iImageWatermark;

    public WatermarkContext(IImageWatermark iImageWatermark) {
        this.iImageWatermark = iImageWatermark;
    }

    public void watermark(OutputStream out) {
        this.iImageWatermark.setOutputStream(out);
        this.iImageWatermark.watermark();
        
        if(out!=null){
            try {
                out.close();
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
    }
}

 

 

import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;

/**
 *
 * @author Administrator
 */
public class Test {

    public static void main(String... args) {
        try {
            OutputStream os = new FileOutputStream("d:\\img_mark_icon.jpg");
            OutputStream sos = new FileOutputStream("d:\\img_mark_string.jpg");
            IconImageWatermark iiw=new IconImageWatermark(ImageIO.read(new File("d:\\img.jpg")), new ImageIcon("d:\\logo.jpg"));
            iiw.setAlpha(0.5f);
//            iiw.setDegree(-40);
            WatermarkContext context=new WatermarkContext(iiw);
            context.watermark(os);
            
            StringImageWatermark  siw=new StringImageWatermark(ImageIO.read(new File("d:\\img.jpg")), "襄樊诚作房地产评估有限公司");
            siw.setAlpha(0.5f);
            WatermarkContext scontext=new WatermarkContext(siw);
            scontext.watermark(sos);
           
        } catch (Exception ex) {
            Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
        }

    }
}

 

评论

1 楼 calosteward 2014-12-09  

谢谢分享
赞一个。

____________________
java qr code image
java barcode