jsp 上传图片并生成缩位图或者加水印

//添加水印,filePath 源图片路径， watermark 水印图片路径
public static boolean createMark(String filePath,String watermark) {
ImageIcon imgIcon=new ImageIcon(filePath);
Image theImg =imgIcon.getImage();
ImageIcon waterIcon=new ImageIcon(watermark);
Image waterImg =waterIcon.getImage();
int width=theImg.getWidth(null);
int height= theImg.getHeight(null);
BufferedImage bimage = new BufferedImage(width,height, BufferedImage.TYPE_INT_RGB);
Graphics2D g=bimage.creatGraphics( );
g.setColor(Color.red);
g.setBackground(Color.white);
g.drawImage(theImg, 0, 0, null );
g.drawImage(waterImg, 100, 100, null );
g.drawString("12233",10,10); //添加文字
g.dispose();
try{
FileOutputStream out=new FileOutputStream(filePath);
JPEGImageEncoder encoder =JPEGCodec.createJPEGEncoder(out);
JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(bimage);
param.setQuality(50f, true);
encoder.encode(bimage, param);
out.close();
}catch(Exception e){ return false; }
return true;
}