java实现图片水印的添加
2013年01月18日
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import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.image.*;
import java.io.*;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import javax.swing.*;
import com.sun.image.codec.jpeg.*;
/** *//**
* @author zsy
*
*/
public class WaterMark ...{
private static List logoImgs;
private static List bgImgs ;
private static boolean flag;
public static List getBgImgs() ...{
return bgImgs;
}
/** *//**
* 设置背景水印图片的路径并把图片加载到内存
* @param bgImgUrls 背景水印图片的相对路径集合
* @param path 图片组所在的文件夹路径
*/
public static void setBgImgs(List bgImgUrls, String path) ...{
bgImgs = new ArrayList();
for (Iterator it = bgImgUrls.iterator(); it.hasNext(); ) ...{
String tem = (String)it.next();
ImageIcon waterIcon = new ImageIcon(path + tem);
bgImgs.add(waterIcon.getImage());
}
}
public static List getLogoImgs() ...{
return logoImgs;
}
/** *//**
* 设置图标水印图片的路径并把图片加载到内存
* @param logoImgUrls 图标水印图片的相对路径集合
* @param path 图片组所在的文件夹路径
*/
public static void setLogoImgs(List logoImgUrls, String path) ...{
logoImgs = new ArrayList();
for (Iterator it = logoImgUrls.iterator(); it.hasNext(); ) ...{
String tem = (String)it.next();
ImageIcon waterIcon = new ImageIcon(path + tem);
logoImgs.add(waterIcon.getImage());
}
}
/** *//**
* 图片中添加图标水印并输出到指定流
* @param data
* @param out
* @param channel
* @return
* @throws Exception
*/
public static boolean createLogoMark(byte[] data,
FileOutputStream out, String channel) throws Exception ...{
int i = (int)(logoImgs.size() * Math.random());
return createMark(data, out, (Image)logoImgs.get(i), true);
}
/** *//**
* 图片中添加背景水印并输出到指定流
* @param data
* @param out
* @param channelName
* @return
* @throws Exception
*/
public static boolean createBgMark(byte[] data,
FileOutputStream out, String channelName) throws Exception ...{
int i = (int)(bgImgs.size() * Math.random());
return createMark(data, out, (Image)bgImgs.get(i), false);
}
/** *//**
* 生成随机水印并输出到指定流
* @param data
* @param out
* @return
* @throws Exception
*/
public static boolean createRandomMark(byte[] data,
FileOutputStream out) throws Exception ...{
int i = 0;
Image temImg = null;
if (!flag) ...{
i = (int)(logoImgs.size() * Math.random());
temImg = (Image)logoImgs.get(i);
} else ...{
i = (int)(bgImgs.size() * Math.random());
temImg = (Image)bgImgs.get(i);
}
flag = !flag;
return createMark(data, out, temImg, flag);
}
/** *//**
* 生成水印并输出到指定流
* @param data
* @param out
* @param waterImg 水印图片的类型（背景或图标），应与isLogoImg参数一致
* @param isLogoImg 等于true 时生成图标水印，否则为背景水印
* @return
* @throws Exception
*/
private static boolean createMark(byte[] data, FileOutputStream out,
Image waterImg ,boolean isLogoImg) throws Exception ...{
ImageIcon imgIcon = new ImageIcon(data);
Image theImg = imgIcon.getImage();
int width = theImg.getWidth(null);
int height = theImg.getHeight(null);
if (width < 200 || height < 200) ...{//小图片不加水印真接输入,如头像图片
BufferedOutputStream fout = null;
ByteArrayInputStream in = new ByteArrayInputStream(data);
try ...{
byte[] b = new byte[1024*10];
fout = new BufferedOutputStream(out);
while(in.read(b) > 0) ...{
out.write(b);
}
out.flush();
out.close();
in.close();
} catch(Exception e) ...{
e.printStackTrace();
throw e;
} finally ...{
if (in != null) ...{
in.close();
}
if (fout != null) ...{
fout.close();
}
}
return true;
}
BufferedImage bimage = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
Graphics2D g = bimage.createGraphics();
g.setBackground(Color.white);
g.drawImage(theImg, 0, 0, null);
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