JAVA给图片添加水印

 

public void mark(String srcImgPath, String outImgPath, Color markContentColor, String waterMarkContent,Integer degree) {
try {
// 读取原图片信息
File srcImgFile = new File(srcImgPath);
Image srcImg = ImageIO.read(srcImgFile);
int srcImgWidth = srcImg.getWidth(null);
int srcImgHeight = srcImg.getHeight(null);
// 加水印
BufferedImage bufImg = new BufferedImage(srcImgWidth, srcImgHeight, BufferedImage.TYPE_INT_RGB);
Graphics2D g = bufImg.createGraphics();
g.drawImage(srcImg, 0, 0, srcImgWidth, srcImgHeight, null);
//Font font = new Font("Courier New", Font.PLAIN, 12);
Font font = new Font("黑体", Font.BOLD, 50);
g.setColor(markContentColor); //根据图片的背景设置水印颜色
g.setFont(font);
// int x = srcImgWidth - getWatermarkLength(waterMarkContent, g) - 3;
//  int y = srcImgHeight - 3;
//设置文字在图片上居中
int x = (srcImgWidth - getWatermarkLength(waterMarkContent, g)) / 2;
int y = srcImgHeight / 2;
//设置水印旋转
if (null != degree) {
g.rotate(Math.toRadians(degree),
(double) bufImg.getWidth() / 2, (double) bufImg
.getHeight() / 2);
}
// 7、设置水印文字透明度
float alpha = 0.8f; // 透明度；1.0f为不透明
g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,alpha));
//第一参数->水印的内容，后面两个参数->文字在图片上的坐标位置(x,y)
g.drawString(waterMarkContent,x, y);
//释放资源
g.dispose();
// 输出图片
FileOutputStream outImgStream = new FileOutputStream(outImgPath);
ImageIO.write(bufImg, "jpg", outImgStream);
outImgStream.flush();
outImgStream.close();
} catch (Exception e) {
e.printStackTrace();
}
}
public int getWatermarkLength(String waterMarkContent, Graphics2D g) {
return g.getFontMetrics(g.getFont()).charsWidth(waterMarkContent.toCharArray(), 0, waterMarkContent.length());
}