>在将图像添加到我的数据库之前,我一直在将每个图像的大小调整为固定分辨率。为此,我一直在使用文件上传和以下代码:-
logo_name = System.currentTimeMillis() + ".png";
File uploadedFile = new File("/www/static.appcanvas.com/"+logo_name);
BufferedImage bi = ImageIO.read(item.getInputStream());
Image img = bi.getScaledInstance(125,125,Image.SCALE_SMOOTH);
BufferedImage img_logo = new BufferedImage(125,125,BufferedImage.TYPE_INT_RGB);
Graphics2D g = img_logo.createGraphics();
g.drawImage(img,0,0,null);
if(g != null) g.dispose();
ImageIO.write(img_logo,"png",uploadedFile)
我得到了所需分辨率的图像,但有一个不必要的黑色背景,我无法删除。之前的图像 : http://www.rocketcampus.com/images/test.png之后的图像:http://static.appcanvas.com/1334085929080.png
您可以将
BufferedImage
的类型更改为BufferedImage.TYPE_INT_ARGB
具有透明背景。
这对我有用:
public static void main(String[] args) throws IOException {
FileInputStream item = new FileInputStream("D:/tmp/OpenFlexo_07.gif");
String logo_name = System.currentTimeMillis() + ".png";
File uploadedFile = new File("d:/www/static.appcanvas.com/" + logo_name);
BufferedImage bi = ImageIO.read(item);
Image img = bi.getScaledInstance(125, 125, Image.SCALE_SMOOTH);
BufferedImage img_logo = new BufferedImage(125, 125, BufferedImage.TYPE_INT_RGB);
Graphics2D g = img_logo.createGraphics();
g.drawImage(img, 0, 0, null);
if (g != null) {
g.dispose();
}
uploadedFile.getParentFile().mkdirs();
uploadedFile.createNewFile();
ImageIO.write(img_logo, "png", uploadedFile);
}