java程序向图片上加水印

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import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.FileOutputStream;

import javax.swing.ImageIcon;

import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGEncodeParam;
import com.sun.image.codec.jpeg.JPEGImageEncoder;

public class WaterMark {
    /**
     * 给图片添加水印
     * 
     * @param filePath
     *            需要添加水印的图片的路径
     * @param markContent
     *            水印的文字
     * @param markContentColor
     *            水印文字的颜色
     * @param qualNum
     *            图片质量
     * @return
     */
    public void createMark(String filePath, String markContent,
            Color markContentColor, float qualNum) {
        
        ImageIcon imgIcon = new ImageIcon(filePath);
        Image theImg = imgIcon.getImage();
        int width = theImg.getWidth(null);
        int height = theImg.getHeight(null);
        BufferedImage bimage = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);
        
        Graphics2D g = bimage.createGraphics();
        g.setColor(markContentColor);
        g.setBackground(Color.white);
        g.drawImage(theImg, 0, 0, null);
        g.drawString(markContent, width / 3, height / 2); // 添加水印的文字和设置水印文字出现的内容
        g.dispose();
        
        try {
            FileOutputStream out = new FileOutputStream(filePath);
            JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
            JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(bimage);
            param.setQuality(qualNum, true);
            encoder.encode(bimage, param);
            out.close();
            
        } catch (Exception e) {
            return ;
        }
    }
    
    public static void main(String[] args) {
        WaterMark wm = new WaterMark();
        
        wm.createMark("d://map.jpg","
http://www.163.com",Color.WHITE,70f);
    }
}
 

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