java bmp图片转成png

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;

public class ConvertImage {
public static void main(String args[]) throws IOException {
File inputFile = new File("c:\\11.bmp");
BufferedImage input = ImageIO.read(inputFile);

File outputFile = new File("c:\\test.png");
ImageIO.write(input, "BMP", outputFile);

outputFile = new File("c:\\test.png");
ImageIO.write(input, "PNG", outputFile);
}
}