java 万能图片格式转换

话不多说，直接上代码

import java.awt.image.BufferedImage;
import java.awt.image.Raster;
import java.io.File;
import java.io.IOException;


import javax.imageio.ImageIO;

public class IOUtil {

	public static void pgm2png(String src, String dest) throws IOException {

		BufferedImage image = ImageIO.read(new File(src));
		Raster source = image.getRaster();
		int width = image.getWidth();
		int height = image.getHeight();

		// 创建BufferedImage对象
		// BufferedImage image2 = new BufferedImage(width,
		// height,BufferedImage.TYPE_BYTE_BINARY);//黑色
		BufferedImage image2 = new BufferedImage(width, height, BufferedImage.TYPE_BYTE_GRAY);// 灰色
		// BufferedImage image2 = new BufferedImage(width, height,
		// BufferedImage.TYPE_BYTE_INDEXED);//黄色
		image2.setData(source);
		// 保存文件
		ImageIO.write(image2, "png", new File(dest));
	}
}

上述代码中，有几个参数需要在格式转换的时候调整。\

• new BufferedImage(width, height, BufferedImage.TYPE_BYTE_GRAY)的第三个参数，图片格式类型
• ImageIO.write(image2, "png", new File(dest)); 的第二个参数，转换的目标图片格式